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16 Product overview • 2013 We reserve the right to change designs and technical specifications of our products. Expansion Vessels Flamco produces a comprehensive range of diaphragm expansion vessels. Both the steel vessel and the diaphragm are of the highest quality. They are compliant with all prevailing European standards and carry the CE mark of conformity. Flamco vessels are available for both potable, chilled and heated water systems in sizes ranging from 2 litres up to 8,000 litres. 1.

Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

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Page 1: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

16 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Expansion VesselsFlamco produces a comprehensive range of diaphragm expansion vessels. Both the steel vessel and the diaphragm are of the highest quality. They are compliant with all prevailing European standards and carry the CE mark of conformity. Flamco vessels are available for both potable, chilled and heated water systems in sizes ranging from 2 litres up to 8,000 litres.

1.

Page 2: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

17

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

Expansion VesselsFlamco produces a comprehensive range of diaphragm expansion vessels. Both the steel vessel and the diaphragm are of the highest quality. They are compliant with all prevailing European standards and carry the CE mark of conformity. Flamco vessels are available for both potable, chilled and heated water systems in sizes ranging from 2 litres up to 8,000 litres.

Page 3: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

18 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Removable bladder Removable bladder

Expansion Vessels Overview

Fixed Diaphragm Removable Diaphragm Flexcon Intermediate Vessels

Flexcon M• 80 - 8,000 litres.• Max. operating pressure:

6/10/16/25 bar.• High-quality industrial tank.• Larger dimensions available on

request.

Flexcon• 110 - 1,000 litres.• Max. operating pressure:

6 bar: 110 - 1,000 litres,10 bar: 110 - 1,000 litres.

• For systems large and small.

Flexcon P• 18 - 50 litres.• Max. operating pressure: 3 bar.• Space-saving alternative

for smaller systems.

Flexcon TOP• 8 - 80 litres.• Max. operating pressure: 6 bar.• High-pressure alternative

for smaller systems.

Flexcon Solar• 8 - 1,000 litres.• Max. operating pressure:

8 bar: 8 - 80 litre,10 bar: 110 - 1,000 litres.

• For solar systems.

Flexcon PRO• 200 - 1,000 litres.• Max. operating pressure: 6 bar.

Flexcon VSV• For central heating systems in which

the inlet temperature exceeds 90 °C or the return temperature exceeds 70 °C.

• Max. operating temperature: 160 °C.• Operating pressure: 6/10 bar.

Flexcon V-B• For central heating systems in which

the inlet temperature exceeds 90 °C or the return temperature exceeds 70 °C.

• Max. operating temp.: 120/160 °C.• Max. operating pressure: 6/10 bar.

Flexcon C• 2 - 1,000 litres.• Max. operating pressure: 3 bar• For small installations.

Cubex R• 12 - 18 litres.• Max. operating pressure: 3 bar.• Space-saving alternative

for smaller systems.

FLEXCON P 18

FLEXCON P 25

FLEXCON P 35

FLEXCON P 50

• Butyl rubber diaphragm: Excellent pre-charge gas pressure maintenance. • Pre-formed convex diaphragm with fl exible 'rolling' action prevents the

diaphragm from stretching.• The proven Flamco clamp ring construction permits the use of a butyl

rubber diaphragm that is approximately half the size of a full diaphragm in a comparable vessel. This ensures reduced permeability and a long service life for the expansion vessel.

• Quick, easy and space saving installation using the wall mounting bracket. • 5 year warranty.

Flexcon P: Space Saving Expansion Vessels of Superior Quality

Contra-Flex• 8 - 200 litres.• Max. operating pressure;

3 bar: 8 - 35 litres,6 bar: 50 - 200 litres.

Page 4: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

19

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

Removable bladder Removable bladder

Expansion Vessels Overview

Fixed Diaphragm Removable Diaphragm Flexcon Intermediate Vessels

Flexcon M• 80 - 8,000 litres.• Max. operating pressure:

6/10/16/25 bar.• High-quality industrial tank.• Larger dimensions available on

request.

Flexcon• 110 - 1,000 litres.• Max. operating pressure:

6 bar: 110 - 1,000 litres,10 bar: 110 - 1,000 litres.

• For systems large and small.

Flexcon P• 18 - 50 litres.• Max. operating pressure: 3 bar.• Space-saving alternative

for smaller systems.

Flexcon TOP• 8 - 80 litres.• Max. operating pressure: 6 bar.• High-pressure alternative

for smaller systems.

Flexcon Solar• 8 - 1,000 litres.• Max. operating pressure:

8 bar: 8 - 80 litre,10 bar: 110 - 1,000 litres.

• For solar systems.

Flexcon PRO• 200 - 1,000 litres.• Max. operating pressure: 6 bar.

Flexcon VSV• For central heating systems in which

the inlet temperature exceeds 90 °C or the return temperature exceeds 70 °C.

• Max. operating temperature: 160 °C.• Operating pressure: 6/10 bar.

Flexcon V-B• For central heating systems in which

the inlet temperature exceeds 90 °C or the return temperature exceeds 70 °C.

• Max. operating temp.: 120/160 °C.• Max. operating pressure: 6/10 bar.

Flexcon C• 2 - 1,000 litres.• Max. operating pressure: 3 bar• For small installations.

Cubex R• 12 - 18 litres.• Max. operating pressure: 3 bar.• Space-saving alternative

for smaller systems.

FLEXCON P 18

FLEXCON P 25

FLEXCON P 35

FLEXCON P 50

• Butyl rubber diaphragm: Excellent pre-charge gas pressure maintenance. • Pre-formed convex diaphragm with fl exible 'rolling' action prevents the

diaphragm from stretching.• The proven Flamco clamp ring construction permits the use of a butyl

rubber diaphragm that is approximately half the size of a full diaphragm in a comparable vessel. This ensures reduced permeability and a long service life for the expansion vessel.

• Quick, easy and space saving installation using the wall mounting bracket. • 5 year warranty.

Flexcon P: Space Saving Expansion Vessels of Superior Quality

Contra-Flex• 8 - 200 litres.• Max. operating pressure;

3 bar: 8 - 35 litres,6 bar: 50 - 200 litres.

Page 5: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

20 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Calculation for a Flexcon expansion vessel for central heating systems with fixed or removable diaphragm

Basic parameters for the calculation of a Flexcon expansion vessel.

• Vessel volume This is the total capacity of the Flexcon expansion vessel.

• Vessel efficiency This is the maximum amount of expansion water that can be contained in the vessel.

• Static height This is the height of the system from the Flexcon expansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar).

Vessel Calculation for Central Heating Systems• Initial pressure of the Flexcon expansion vessel

This is the pressure measured at the nitrogen filler valve at ambient temperature and atmospheric pressure. The pressure is equivalent to the static height, rounded up to a factor of 0.5 bar.

• Maximum working pressureThis is the maximum permissible system pressure at the Flexcon expansion vessel. The maximum working pressure may not exceed the maximum value indicated on the expansion vessel.

• OutputThis is the ratio between the gross and net vessel capacity.

Net contentsOutput = –––––––––––––––

Gross capacity

• The output is determined by the ratio between initial and end pressure. In formulaic form, this is as shown below (derived from Boyle's Law):

end pressure – initial pressureOutput = ––––––––––––––––––––––––––––

end pressure

Note: • pressure in bar absolute• Max. output of Flexcon expansion vessels

with fixed diaphragm 0.63. • Max. output of Flexcon 800 litre expansion

vessel = 0.5, Flexcon 1,000 litre expansion vessel = 0.4.

• Max. output of Flexcon M = 0.72.

If the maximum output of an expansion vessel is exceeded, the diaphragm may be subjected to tensile stress. This could lead to damage to the diaphragm or even cause it to rupture.

• System water capacity This is the total volume of water in the entire system including heat source, radiators, pipe work etc.

• Expansion volume The expansion volume is calculated as follows: expansion volume = water capacity x increase in volume at average heating temperature.

Example: heating temperature 90/70 °C (average 80 °C) = 2.89%.

• Safety factor We recommend including a margin of 25% when calculating the expansion volume.

• Gross capacity of Flexcon expansion vessels The gross capacity of Flexcon expansion vessels is calculated as follows:

expansion volume x 1.25Gross capacity of vessel = ––––––––––––––––––––––––

output

Pre-charge pressure

Pre-charge pressure 1.0 barPre-charge pressure 0.5 bar

Page 6: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

21

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

Calculation for a Flexcon expansion vessel for central heating systems with fixed or removable diaphragm

Basic parameters for the calculation of a Flexcon expansion vessel.

• Vessel volume This is the total capacity of the Flexcon expansion vessel.

• Vessel efficiency This is the maximum amount of expansion water that can be contained in the vessel.

• Static height This is the height of the system from the Flexcon expansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar).

Vessel Calculation for Central Heating Systems• Initial pressure of the Flexcon expansion vessel

This is the pressure measured at the nitrogen filler valve at ambient temperature and atmospheric pressure. The pressure is equivalent to the static height, rounded up to a factor of 0.5 bar.

• Maximum working pressureThis is the maximum permissible system pressure at the Flexcon expansion vessel. The maximum working pressure may not exceed the maximum value indicated on the expansion vessel.

• OutputThis is the ratio between the gross and net vessel capacity.

Net contentsOutput = –––––––––––––––

Gross capacity

• The output is determined by the ratio between initial and end pressure. In formulaic form, this is as shown below (derived from Boyle's Law):

end pressure – initial pressureOutput = ––––––––––––––––––––––––––––

end pressure

Note: • pressure in bar absolute• Max. output of Flexcon expansion vessels

with fixed diaphragm 0.63. • Max. output of Flexcon 800 litre expansion

vessel = 0.5, Flexcon 1,000 litre expansion vessel = 0.4.

• Max. output of Flexcon M = 0.72.

If the maximum output of an expansion vessel is exceeded, the diaphragm may be subjected to tensile stress. This could lead to damage to the diaphragm or even cause it to rupture.

• System water capacity This is the total volume of water in the entire system including heat source, radiators, pipe work etc.

• Expansion volume The expansion volume is calculated as follows: expansion volume = water capacity x increase in volume at average heating temperature.

Example: heating temperature 90/70 °C (average 80 °C) = 2.89%.

• Safety factor We recommend including a margin of 25% when calculating the expansion volume.

• Gross capacity of Flexcon expansion vessels The gross capacity of Flexcon expansion vessels is calculated as follows:

expansion volume x 1.25Gross capacity of vessel = ––––––––––––––––––––––––

output

Pre-charge pressure

Pre-charge pressure 1.0 barPre-charge pressure 0.5 bar

Page 7: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

22 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Temperature increase[°C]

Volume increase[%]

10 - 25 0.3510 - 35 0.6310 - 40 0.7510 - 45 0.9610 - 50 1.1810 - 55 1.4210 - 60 1.6810 - 70 2.2510 - 80 2.8910 - 90 3.5810 - 100 4.3410 - 110 5.16

• Increase in volume of water in % The table below shows the percentage volume increase of water as temperature increases from 10°C to 110°C.

10

FLAMC 1273

20 30 40 50 60 70 80 90 100 110 120

1

0

2

3

4

5

6

• Temperature in the Flexcon expansion vessel The maximum continuous temperature in the Flexcon expansion vessel is 70 °C. The minimum permissible temperature in the Flexcon expansion vessel is -10 °C.

OutputIn this table you can read off the output for various levels of initial and end pressure.We recommend a margin of at least 1.5 bar between the initial and end pressure.

Static height[m]

Initial pressure[bar]

End pressure [bar]

3 6 8 10

5 0.5 0.63 - - -10 1 0.50 0.71 - -15 1.5 0.38 0.64 0.72 -20 2 0.25 0.57 0.67 -25 2.5 0.13 0.50 0.61 0.6830 3 - 0.43 0.56 0.6435 3.5 - 0.36 0.50 0.5940 4 - 0.29 0.44 0.5545 4.5 - 0.21 0.39 0.5050 5 - - 0.33 0.4555 5.5 - - 0.28 0.4160 6 - - 0.22 0.3665 6.5 - - 0.17 0.3270 7 - - - 0.2775 7.5 - - - 0.2380 8 - - - 0.18

Central heating system with Capacity [l/kW] [860 kcal/h]

convectors and/or air heaters 5.2 induction units 5.5air treatment systems 6.9panel radiators 8.8central heating utilities mix 10.0column radiators 12.0 cooled water utilities mix 20.0heated ceiling and/or under-floor heating

18.5

extensive pipework(district heating)

25.8

Approximation of the water capacity of the system

In order to be able to determine the required capacity of the Flexcon vessel, the water capacity of the system as a whole must be calculated. If it is not possible to determine the capacity of the system, it can be approximated using the historic data shown here, based on a supply/return temperature of 90/70 °C.

The water capacity of the system can be approximated by multiplying the output of the system by the values specified in the table. The table refers to new systems. For older systems, we recommend using higher values. This method is an indication only and does not guarantee a precise calculation of the capacity required for your Flexcon expansion vessel.

Volu

me

incr

ease

[%]

Temperature [°C]

Page 8: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

23

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

Temperature increase[°C]

Volume increase[%]

10 - 25 0.3510 - 35 0.6310 - 40 0.7510 - 45 0.9610 - 50 1.1810 - 55 1.4210 - 60 1.6810 - 70 2.2510 - 80 2.8910 - 90 3.5810 - 100 4.3410 - 110 5.16

• Increase in volume of water in % The table below shows the percentage volume increase of water as temperature increases from 10°C to 110°C.

10

FLAMC 1273

20 30 40 50 60 70 80 90 100 110 120

1

0

2

3

4

5

6

• Temperature in the Flexcon expansion vessel The maximum continuous temperature in the Flexcon expansion vessel is 70 °C. The minimum permissible temperature in the Flexcon expansion vessel is -10 °C.

OutputIn this table you can read off the output for various levels of initial and end pressure.We recommend a margin of at least 1.5 bar between the initial and end pressure.

Static height[m]

Initial pressure[bar]

End pressure [bar]

3 6 8 10

5 0.5 0.63 - - -10 1 0.50 0.71 - -15 1.5 0.38 0.64 0.72 -20 2 0.25 0.57 0.67 -25 2.5 0.13 0.50 0.61 0.6830 3 - 0.43 0.56 0.6435 3.5 - 0.36 0.50 0.5940 4 - 0.29 0.44 0.5545 4.5 - 0.21 0.39 0.5050 5 - - 0.33 0.4555 5.5 - - 0.28 0.4160 6 - - 0.22 0.3665 6.5 - - 0.17 0.3270 7 - - - 0.2775 7.5 - - - 0.2380 8 - - - 0.18

Central heating system with Capacity [l/kW] [860 kcal/h]

convectors and/or air heaters 5.2 induction units 5.5air treatment systems 6.9panel radiators 8.8central heating utilities mix 10.0column radiators 12.0 cooled water utilities mix 20.0heated ceiling and/or under-floor heating

18.5

extensive pipework(district heating)

25.8

Approximation of the water capacity of the system

In order to be able to determine the required capacity of the Flexcon vessel, the water capacity of the system as a whole must be calculated. If it is not possible to determine the capacity of the system, it can be approximated using the historic data shown here, based on a supply/return temperature of 90/70 °C.

The water capacity of the system can be approximated by multiplying the output of the system by the values specified in the table. The table refers to new systems. For older systems, we recommend using higher values. This method is an indication only and does not guarantee a precise calculation of the capacity required for your Flexcon expansion vessel.

Volu

me

incr

ease

[%]

Temperature [°C]

Page 9: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

24 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Theory

Minimum working pressureSpecific circulation pumps demand a certain pressure (for instance 1 bar) in their suction pipe in order to function properly. Many modern central heating boilers are protected to a minimum working pressure of 0.8 or 1 bar. If such a pump or boiler is built in to a central heating system with a low static height, it may be more sensible to set the initial pressure of the expansion vessel to 1 bar rather than 0.5 bar. Note that the increased initial pressure does not ensure that the minimum working pressure is replicated throughout the system! The chance of negative pressure being created high up in the system when it is cooling down, which would cause air circulation problems, is greater if the initial pressure is, say, 1 bar than if the initial pressure were set at 0.5 bar. If the pressure in the system drops below 1 bar, expansion vessels with initial pressure of 1 bar cannot give back water to the system as the expansion vessel would run dry!

Boost pressureIn order to prevent negative pressure and air circulation problems, it is of the greatest importance that the expansion vessel does not run dry. This is why Flamco recommends that you fill the system when it is cold and at a pressure equal to the initial pressure plus 0.2 to 0.3 bar (if you are topping up a warmer system, the pressure must, accordingly, be higher).

An incorrect, excessive boost pressure may lead to problems. If the system in which a expansion vessel is fitted and an initial pressure of 0.5 bar is filled to 2 bar rather than 0.8 bar, 30% more of the gross capacity will already have been used up before the central heating water expands due to the increase in temperature!

(3 + 1) - (0.8 + 1) A = ––––––––––––––––– = 0.55 = 55% (3.0 + 1)

(3 + 1) - (2 + 1) B = ––––––––––––––––– = 0.25 = 25% (3 + 1)

Difference in output (): 30%

Conclusion

• A higher initial pressure in a expansion vessel does not guarantee higher system pressure.

• An incorrect, excessive boost pressure has an undue impact. Flamco recommends filling the system to the right pressure, preferably 0.2 to 0.3 bar above the initial pressure of the Flexcon expansion vessel (when cold).

Assistance

• To make the correct calculation in respect of which Flexcon expansion vessel to use, Flamco can offer all sorts of assistance; we can provide technical documentation, disc calculators and computer programs.

N.B.: The right place for the expansion vessel is in the system’s return line, on the suction side of the circulation pump.

Example 1

Data- water capacity = 340 liters- average heating temperature (90/70 ºC) = 80 ºC- system height = 8 m- end pressure = 3.0 bar- Flexcon expansion vessel and boiler placed above.

CalculationIncrease in volume in % = 2.89% ≈ 2.9%

340 x 2.9Expansion volume = ––––––––– = 9.86 liters 100Reserve 25% = 9.9 x 1.25 = 12.4 liters

(3.0 + 1) - (0.5 + 1)Output = ––––––––––––––––– = 0.63 (3.0 + 1)

Required gross capacity of the 12.4Flexcon expansion vessel = –––– = 19.7 liters 0.63

The ideal model is a Flexcon 25/0.5.

Example 2

Data- capacity unknown - boiler output = 280 kW- average heating temperature (80/60 ºC) = 70 ºC- system height = 12 m- end pressure = 3.0 bar- Flexcon expansion vessel and boiler placed below.- system components: 100% panel radiators

CalculationCalculated system capacity = 280 x 8.8 = 2,464 liters

Increase in volume in % = 2.25%

2,464 x 2.25Expansion volume = ––––––––––– = 55.4 liters 100Reserve 25% = 55.4 x 1.25 = 69.3 liters

(3.0 + 1) - (1.5 + 1)Output = –––––––––––––––– = 0.375 (3.0 + 1)

Required gross capacity of the

69.3Flexcon expansion vessel = ––––– = 184.8 liters 0.375

The ideal model is a Flexcon 200/1.5.

Example calculations for Flexcon expansion vessels

Page 10: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

25

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

Theory

Minimum working pressureSpecific circulation pumps demand a certain pressure (for instance 1 bar) in their suction pipe in order to function properly. Many modern central heating boilers are protected to a minimum working pressure of 0.8 or 1 bar. If such a pump or boiler is built in to a central heating system with a low static height, it may be more sensible to set the initial pressure of the expansion vessel to 1 bar rather than 0.5 bar. Note that the increased initial pressure does not ensure that the minimum working pressure is replicated throughout the system! The chance of negative pressure being created high up in the system when it is cooling down, which would cause air circulation problems, is greater if the initial pressure is, say, 1 bar than if the initial pressure were set at 0.5 bar. If the pressure in the system drops below 1 bar, expansion vessels with initial pressure of 1 bar cannot give back water to the system as the expansion vessel would run dry!

Boost pressureIn order to prevent negative pressure and air circulation problems, it is of the greatest importance that the expansion vessel does not run dry. This is why Flamco recommends that you fill the system when it is cold and at a pressure equal to the initial pressure plus 0.2 to 0.3 bar (if you are topping up a warmer system, the pressure must, accordingly, be higher).

An incorrect, excessive boost pressure may lead to problems. If the system in which a expansion vessel is fitted and an initial pressure of 0.5 bar is filled to 2 bar rather than 0.8 bar, 30% more of the gross capacity will already have been used up before the central heating water expands due to the increase in temperature!

(3 + 1) - (0.8 + 1) A = ––––––––––––––––– = 0.55 = 55% (3.0 + 1)

(3 + 1) - (2 + 1) B = ––––––––––––––––– = 0.25 = 25% (3 + 1)

Difference in output (): 30%

Conclusion

• A higher initial pressure in a expansion vessel does not guarantee higher system pressure.

• An incorrect, excessive boost pressure has an undue impact. Flamco recommends filling the system to the right pressure, preferably 0.2 to 0.3 bar above the initial pressure of the Flexcon expansion vessel (when cold).

Assistance

• To make the correct calculation in respect of which Flexcon expansion vessel to use, Flamco can offer all sorts of assistance; we can provide technical documentation, disc calculators and computer programs.

N.B.: The right place for the expansion vessel is in the system’s return line, on the suction side of the circulation pump.

Example 1

Data- water capacity = 340 liters- average heating temperature (90/70 ºC) = 80 ºC- system height = 8 m- end pressure = 3.0 bar- Flexcon expansion vessel and boiler placed above.

CalculationIncrease in volume in % = 2.89% ≈ 2.9%

340 x 2.9Expansion volume = ––––––––– = 9.86 liters 100Reserve 25% = 9.9 x 1.25 = 12.4 liters

(3.0 + 1) - (0.5 + 1)Output = ––––––––––––––––– = 0.63 (3.0 + 1)

Required gross capacity of the 12.4Flexcon expansion vessel = –––– = 19.7 liters 0.63

The ideal model is a Flexcon 25/0.5.

Example 2

Data- capacity unknown - boiler output = 280 kW- average heating temperature (80/60 ºC) = 70 ºC- system height = 12 m- end pressure = 3.0 bar- Flexcon expansion vessel and boiler placed below.- system components: 100% panel radiators

CalculationCalculated system capacity = 280 x 8.8 = 2,464 liters

Increase in volume in % = 2.25%

2,464 x 2.25Expansion volume = ––––––––––– = 55.4 liters 100Reserve 25% = 55.4 x 1.25 = 69.3 liters

(3.0 + 1) - (1.5 + 1)Output = –––––––––––––––– = 0.375 (3.0 + 1)

Required gross capacity of the

69.3Flexcon expansion vessel = ––––– = 184.8 liters 0.375

The ideal model is a Flexcon 200/1.5.

Example calculations for Flexcon expansion vessels

Page 11: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

26 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

For calculations of Flexcon expansion vessels for Solar installations, refer to the spreadsheet on www.fl amcogroup.com.

52 vol.%

[-40 °C

]

44 vol.%

[-30 °C

]

39 vol.%

[-25 °C

]

34 vol.%

[-20 °C

]

28 vol.%

[-15 °C

]

20 vol.%

[-10 °C

]

0 vol.%

= wate

r

7

6

5

4

3

2

1

0,64

0

0,78

0,44

0,130,28

1,31

-40 -30 -20 -10 0 10 20 30 40 706050

Temperature [°C]

Volu

me

Incr

ease

[%]

Expansion coeffi cient of water with and without added anti-freeze

Temperature[°C]

Percentage of glycol

0% 10% 20% 30% 40% 50%

In a cooling system, Flexcon expansion vessels may have the following functions:• As the system cools, the volume of the cooling water

shrinks. The Flexcon expansion vessel thus gives water back to the system, maintaining system pressure.

• If the system is turned off, the water can return to the ambient temperature, allowing it to expand. The vessel absorbs this expansion volume.

Vessel Calculation for Cooling SystemsCalculation for a Cooling System

The following data is required to calculate the required volume of Flexcon expansion vessel:• Volume of system water.• Percentage of added anti freeze.• Lowest system temperature.• Maximum system temperature

(= highest ambient temperature).• Water - anti-freeze mix expansion (percentage).• Static height of the system above the vessel.• Maximum working pressure.

The Expansion Coefficient of Antifreeze

All Flexcon expansion vessels can be used in systems in which glycol-based anti-freeze is added to the system water.The table below shows the increase in volume of various water/ethylene glycol mixing ratios. These are average values.

The initial pressure of the expansion vessel is selected to match the static height of the system (above the expansion vessel). The following formula can be used to calculate the fill level of the expansion vessel at the lowest operating pressure.

lowest operating pressure - initial pressureI –––––––––––––––––––––––––––––––––––––––– = fill level lowest operating pressure

This means that the residual factor of the expansion vessel can be determined.

Residual factor = 1 - fill level.

The end pressure must be 0.5 bar lower than the set pressure of the safety valve.

The output is calculated using the formula below:

end pressure - lowest operating pressureII –––––––––––––––––––––––––––––––––––––– x residual factor = output end pressure

Note: • Pressure in bar absolute.• Max. output of Flexcon expansion vessels with fixed diaphragm 0.63.• Max. output of Flexcon 800 liter expansion vessel = 0/5, Flexcon 1.000 liter expansion vessel = 0/4.• Max. output of Flexcon M = 0.72.

The temperature in the Flexcon expansion vessel must remain above -10 ºC.

A buffer vessel or Flexcon intermediate expansion vessel may have to be fitted between the system and the Flexcon expansion vessel.

10 0.04 0.35 0.67 0.89 1.31 1.63 20 0.18 0.50 0.82 1.04 1.46 1.78 30 0.43 0.75 1.07 1.29 1.71 2.03 40 0.79 1.11 1.43 1.65 2.07 2.39 50 1.21 1.53 1.85 2.07 2.49 2.81 60 1.71 2.03 2.35 2.57 2.99 3.31 70 2.25 2.60 2.92 3.14 3.56 3.88 80 2.89 3.22 3.54 3.76 4.18 4.52 90 3.58 3.91 4.23 4.45 4.87 5.19100 4.35 4.63 4.95 5.17 5.59 5.90

Page 12: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

27

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

For calculations of Flexcon expansion vessels for Solar installations, refer to the spreadsheet on www.fl amcogroup.com.

52 vol.%

[-40 °C

]

44 vol.%

[-30 °C

]

39 vol.%

[-25 °C

]

34 vol.%

[-20 °C

]

28 vol.%

[-15 °C

]

20 vol.%

[-10 °C

]

0 vol.%

= wate

r

7

6

5

4

3

2

1

0,64

0

0,78

0,44

0,130,28

1,31

-40 -30 -20 -10 0 10 20 30 40 706050

Temperature [°C]

Volu

me

Incr

ease

[%]

Expansion coeffi cient of water with and without added anti-freeze

Temperature[°C]

Percentage of glycol

0% 10% 20% 30% 40% 50%

In a cooling system, Flexcon expansion vessels may have the following functions:• As the system cools, the volume of the cooling water

shrinks. The Flexcon expansion vessel thus gives water back to the system, maintaining system pressure.

• If the system is turned off, the water can return to the ambient temperature, allowing it to expand. The vessel absorbs this expansion volume.

Vessel Calculation for Cooling SystemsCalculation for a Cooling System

The following data is required to calculate the required volume of Flexcon expansion vessel:• Volume of system water.• Percentage of added anti freeze.• Lowest system temperature.• Maximum system temperature

(= highest ambient temperature).• Water - anti-freeze mix expansion (percentage).• Static height of the system above the vessel.• Maximum working pressure.

The Expansion Coefficient of Antifreeze

All Flexcon expansion vessels can be used in systems in which glycol-based anti-freeze is added to the system water.The table below shows the increase in volume of various water/ethylene glycol mixing ratios. These are average values.

The initial pressure of the expansion vessel is selected to match the static height of the system (above the expansion vessel). The following formula can be used to calculate the fill level of the expansion vessel at the lowest operating pressure.

lowest operating pressure - initial pressureI –––––––––––––––––––––––––––––––––––––––– = fill level lowest operating pressure

This means that the residual factor of the expansion vessel can be determined.

Residual factor = 1 - fill level.

The end pressure must be 0.5 bar lower than the set pressure of the safety valve.

The output is calculated using the formula below:

end pressure - lowest operating pressureII –––––––––––––––––––––––––––––––––––––– x residual factor = output end pressure

Note: • Pressure in bar absolute.• Max. output of Flexcon expansion vessels with fixed diaphragm 0.63.• Max. output of Flexcon 800 liter expansion vessel = 0/5, Flexcon 1.000 liter expansion vessel = 0/4.• Max. output of Flexcon M = 0.72.

The temperature in the Flexcon expansion vessel must remain above -10 ºC.

A buffer vessel or Flexcon intermediate expansion vessel may have to be fitted between the system and the Flexcon expansion vessel.

10 0.04 0.35 0.67 0.89 1.31 1.63 20 0.18 0.50 0.82 1.04 1.46 1.78 30 0.43 0.75 1.07 1.29 1.71 2.03 40 0.79 1.11 1.43 1.65 2.07 2.39 50 1.21 1.53 1.85 2.07 2.49 2.81 60 1.71 2.03 2.35 2.57 2.99 3.31 70 2.25 2.60 2.92 3.14 3.56 3.88 80 2.89 3.22 3.54 3.76 4.18 4.52 90 3.58 3.91 4.23 4.45 4.87 5.19100 4.35 4.63 4.95 5.17 5.59 5.90

Page 13: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

28 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

The diaphragm has a extremely low permeability

FLEXCON 35 - 80 FLEXCON 110 - 1,000

1

1 1

2

233

4 4

556 6

Flamco Flexcon The Top in Pressure Expansion Vessels

Flamco’s standard programme covers a wide range ofexpansion vessels from 2 - 8,000 liters with a widechoice of pre-charge pressures and maximum operating pressures. All models are characterised by their construction, superior quality diaphragms or bladders, high quality coating on the expansion vessel itself and efficient production methods.

Why Flexcon is the best choice• The rolling action of the diaphragm prevents

stretching.This has a significant impact on its service life.

• The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel.

• The thread of the water connection is uncoated to ensure easy and water tight installation.

• All vessels are factory tested.

When cold, the nitrogen cushion presses the diaphragm against the wall of the Flexcon expansion vessel.

When heated further, the expansion vessel portion fully fills with water and the nitrogen gas is fully compressed.

The rolling action of the diaphragm prevents stretching.This has a significantimpact on its service life.

The thread of the water connection is uncoated to ensure easy and water tight installation.

The two halves of the vessel are coated prior to assembly.

Flexcon expansion vessels are delivered in a stackablecardboard packaging withhand grip and each boxcontains clear assemblyinstructions.

Flexcon expansion vessels are always in stock at ourwholesalers and our ownwarehouses.

Qualified Flamco employees will be happy to give you advice and support. They are just a telephone call away.

The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel.

The nitrogen valve of Flexcon 8 - 80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover.

If the pressure rises too high,the Prescor valve opens. The excess water/steam is discharged.

When heated, the expansion vessel partially fills with water and the nitrogen gas is compressed.

Systems with Flexcon expansion vessels1. Flexcon expansion vessel.2. Prescor Safety valve.3. Flamco tundish.4. Flamcovent or Flexair air separator.5. Flexfast quick-release coupling.6. Flexcon pressure gauge.

FLEXCON 8 - 25FLEXCON 2 - 4

Other reasons for choosing Flexcon• Excellent service before, during and after

installation.• Handy accessories for mounting or disconnecting

Flexcon expansion vessels.• Our diaphragms are suitable for use with anti-

freeze. Exact details are available on request.

• The nitrogen valve of Flexcon 8 - 80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover.

• The two halves of the vessel are coated prior to assembly.

Page 14: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

29

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

The diaphragm has a extremely low permeability

FLEXCON 35 - 80 FLEXCON 110 - 1,000

1

1 1

2

233

4 4

556 6

Flamco Flexcon The Top in Pressure Expansion Vessels

Flamco’s standard programme covers a wide range ofexpansion vessels from 2 - 8,000 liters with a widechoice of pre-charge pressures and maximum operating pressures. All models are characterised by their construction, superior quality diaphragms or bladders, high quality coating on the expansion vessel itself and efficient production methods.

Why Flexcon is the best choice• The rolling action of the diaphragm prevents

stretching.This has a significant impact on its service life.

• The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel.

• The thread of the water connection is uncoated to ensure easy and water tight installation.

• All vessels are factory tested.

When cold, the nitrogen cushion presses the diaphragm against the wall of the Flexcon expansion vessel.

When heated further, the expansion vessel portion fully fills with water and the nitrogen gas is fully compressed.

The rolling action of the diaphragm prevents stretching.This has a significantimpact on its service life.

The thread of the water connection is uncoated to ensure easy and water tight installation.

The two halves of the vessel are coated prior to assembly.

Flexcon expansion vessels are delivered in a stackablecardboard packaging withhand grip and each boxcontains clear assemblyinstructions.

Flexcon expansion vessels are always in stock at ourwholesalers and our ownwarehouses.

Qualified Flamco employees will be happy to give you advice and support. They are just a telephone call away.

The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel.

The nitrogen valve of Flexcon 8 - 80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover.

If the pressure rises too high,the Prescor valve opens. The excess water/steam is discharged.

When heated, the expansion vessel partially fills with water and the nitrogen gas is compressed.

Systems with Flexcon expansion vessels1. Flexcon expansion vessel.2. Prescor Safety valve.3. Flamco tundish.4. Flamcovent or Flexair air separator.5. Flexfast quick-release coupling.6. Flexcon pressure gauge.

FLEXCON 8 - 25FLEXCON 2 - 4

Other reasons for choosing Flexcon• Excellent service before, during and after

installation.• Handy accessories for mounting or disconnecting

Flexcon expansion vessels.• Our diaphragms are suitable for use with anti-

freeze. Exact details are available on request.

• The nitrogen valve of Flexcon 8 - 80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover.

• The two halves of the vessel are coated prior to assembly.

Page 15: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

30 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

FLEXCON C

For sealed heating and chilled water (cooling) installations.

When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

• The diaphragm is clamped between two vessel halves, preventing mechanical damage to the diaphragm or vessel halves during use. Compared to other bladder type vessels, the clamp ring construction cuts the air to water diaphragm surface ratio in half, resulting in a much lower permeability of the gas charge, a greater reliability and overall life expectancy of the vessel.

• The thread of the system connection is uncoated, ensuring problem free connection.•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon C 2 - 25

•Maximum operating pressure: 3.0 bar.•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon C 2 2 0,5 216 152 3/4" 1,1 120 13211Flexcon C 2 2 1.5 194 152 3/4" 1.1 120 13213Flexcon C 4 4 0,5 194 257 3/4" 1,6 90 13411Flexcon C 4 4 1.5 194 257 3/4" 1.6 90 13413Flexcon C 8 8 1.5 245 304 3/4" 2.2 60 16077Flexcon C 12 12 1.5 286 336 3/4" 2.1 60 16127Flexcon C 18 18 0,5 328 328 3/4" 3.7 30 16175Flexcon C 18 18 1.5 328 328 3/4" 3.7 30 16177Flexcon C 25 25 0,5 358 380 3/4" 4.5 24 16245Flexcon C 25 25 1.5 358 380 3/4" 4.5 24 16247

Flexcon C 35 - 80

•Maximum operating pressure: 3.0 bar.•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon C 35 35 1.5 396 439 3/4" 5.4 24 16347Flexcon C 50 50 0,5 435 495 3/4" 11.2 12 16491Flexcon C 50 50 1,0 435 495 3/4" 11.2 12 16492Flexcon C 50 50 1.5 435 495 3/4" 11.2 12 16493Flexcon C 50 50 1.5 435 495 3/4" 11.2 12 16493Flexcon C 80 80 0,5 519 551 1" 15.0 12 16815Flexcon C 80 80 1,0 519 551 1" 15.0 12 16816Flexcon C 80 80 1.5 519 551 1" 15.0 12 16817Flexcon C 80 80 1.5 519 551 1" 15.0 12 16817

Nr. 0343

Nr. 0343

CONTRA-FLEX

For sealed heating and chilled water (cooling) installations.

When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Contra-Flex W 8 - 35

•Maximum operating pressure: 3.0 bar.•Deep drawn zinc plated steel clench ring.•White (RAL 9010) epoxy powder coating.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Contra-Flex W 8 8 1.5 245 304 3/4" 2.2 50 26063Contra-Flex W 12 12 1.5 286 336 3/4" 2.1 36 26153Contra-Flex W 18 18 1.5 328 328 3/4" 3.7 24 26163Contra-Flex W 25 25 1.5 358 380 3/4" 4.5 18 26233Contra-Flex W 35 35 1.5 396 439 3/4" 5.4 18 26333

Contra-Flex W 50 - 80

•Maximum operating pressure: 6.0 bar.•Deep drawn zinc plated steel clench ring.•White (RAL 9010) epoxy powder coating.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Contra-Flex W 50 50 1.5 435 495 3/4" 11.2 12 26483Contra-Flex W 80 80 1.5 519 551 1" 15.0 12 26783

Contra-Flex 100 - 200

•Maximum operating pressure: 6.0 bar.•All welded construction.•Red (RAL 3002) epoxy powder coating.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Contra-Flex 100 100 2.5 484 784 1" 23.8 12 26105Contra-Flex 200 200 2.5 484 1300 1" 38.1 1 26215

Nr. 0343

Nr. 0343

Nr. 0343

Page 16: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

31

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON C

For sealed heating and chilled water (cooling) installations.

When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

• The diaphragm is clamped between two vessel halves, preventing mechanical damage to the diaphragm or vessel halves during use. Compared to other bladder type vessels, the clamp ring construction cuts the air to water diaphragm surface ratio in half, resulting in a much lower permeability of the gas charge, a greater reliability and overall life expectancy of the vessel.

• The thread of the system connection is uncoated, ensuring problem free connection.•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon C 2 - 25

•Maximum operating pressure: 3.0 bar.•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon C 2 2 0,5 216 152 3/4" 1,1 120 13211Flexcon C 2 2 1.5 194 152 3/4" 1.1 120 13213Flexcon C 4 4 0,5 194 257 3/4" 1,6 90 13411Flexcon C 4 4 1.5 194 257 3/4" 1.6 90 13413Flexcon C 8 8 1.5 245 304 3/4" 2.2 60 16077Flexcon C 12 12 1.5 286 336 3/4" 2.1 60 16127Flexcon C 18 18 0,5 328 328 3/4" 3.7 30 16175Flexcon C 18 18 1.5 328 328 3/4" 3.7 30 16177Flexcon C 25 25 0,5 358 380 3/4" 4.5 24 16245Flexcon C 25 25 1.5 358 380 3/4" 4.5 24 16247

Flexcon C 35 - 80

•Maximum operating pressure: 3.0 bar.•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon C 35 35 1.5 396 439 3/4" 5.4 24 16347Flexcon C 50 50 0,5 435 495 3/4" 11.2 12 16491Flexcon C 50 50 1,0 435 495 3/4" 11.2 12 16492Flexcon C 50 50 1.5 435 495 3/4" 11.2 12 16493Flexcon C 50 50 1.5 435 495 3/4" 11.2 12 16493Flexcon C 80 80 0,5 519 551 1" 15.0 12 16815Flexcon C 80 80 1,0 519 551 1" 15.0 12 16816Flexcon C 80 80 1.5 519 551 1" 15.0 12 16817Flexcon C 80 80 1.5 519 551 1" 15.0 12 16817

Nr. 0343

Nr. 0343

Page 17: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

32 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Flexcon C 110 - 1000

•Maximum operating pressure: 6.0 bar.•All welded construction.•Red (RAL 3002) epoxy powder coating.

Type Capa-city

[litres]

Pre-charge (bar)

Dimensions Syst.conn.

(M)

Weight[kg] 8

OrderCode

Ø[mm]

Height(mm)

Flexcon C 110 110 0.5 484 784 1" 23,8 17110Flexcon C 110 110 1.0 484 784 1" 23,8 8 17111Flexcon C 110 110 1.5 484 784 1" 23,8 8 17112Flexcon C 110 110 specify 484 784 1" 23,8 8 17114Flexcon C 140 140 0.5 484 950 1" 25,3 8 17115Flexcon C 140 140 1.0 484 950 1" 25,3 8 17116Flexcon C 140 140 1.5 484 950 1" 25,3 8 17117Flexcon C 140 140 specify 484 950 1" 25.3 8 17119Flexcon C 200 200 0.5 484 1300 1" 38,1 8 17120Flexcon C 200 200 1.0 484 1300 1" 38,1 8 17121Flexcon C 200 200 1.5 484 1300 1" 38,1 8 17122Flexcon C 200 200 specify 484 1300 1" 38.1 8 17124Flexcon C 300 300 0.5 600 1330 1" 56,9 6 17130Flexcon C 300 300 1.0 600 1330 1" 56,9 6 17131Flexcon C 300 300 1.5 600 1330 1" 56,9 6 17132Flexcon C 300 300 specify 600 1330 1" 56.9 6 17134Flexcon C 425 425 0.5 790 1180 1" 76,4 1 17140Flexcon C 425 425 1.0 790 1180 1" 76,4 1 17141Flexcon C 425 425 1.5 790 1180 1" 76,4 1 17142Flexcon C 425 425 specify 790 1180 1" 76.4 1 17144Flexcon C 600 600 0.5 790 1540 1" 92,9 1 17160Flexcon C 600 600 1.0 790 1540 1" 92,9 1 17161Flexcon C 600 600 1.5 790 1540 1" 92,9 1 17162Flexcon C 600 600 specify 790 1540 1" 92.9 1 17164Flexcon C 800 800 1.0 790 1888 1" 126,9 1 17180Flexcon C 800 800 1.5 790 1888 1" 126,9 1 17181Flexcon C 800 800 specify 790 1888 1" 126.9 1 17184Flexcon C 1000 1000 1.5 790 2268 1" 145,9 1 17190Flexcon C 1000 1000 specify 790 2268 1" 145.9 1 17194

Nr. 0343

Page 18: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

33

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON

For sealed heating and chilled water (cooling) installations.When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.•All welded construction.•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon 110 - 1000 - 6.0 bar

•Maximum operating pressure: 6.0 bar.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon 110 110 0.5 484 784 1" 23.8 8 16115Flexcon 110 110 1.0 484 784 1" 23.8 8 16116Flexcon 110 110 1.5 484 784 1" 23.8 8 16117Flexcon 110 110 2.0 484 784 1" 23.8 8 16119Flexcon 110 110 2.5 484 784 1" 23.8 8 16120Flexcon 110 110 specify 484 784 1" 23.8 8 16110Flexcon 140 140 0.5 484 950 1" 25.3 8 16145Flexcon 140 140 1.0 484 950 1" 25.3 8 16146Flexcon 140 140 1.5 484 950 1" 25.3 8 16147Flexcon 140 140 2.0 484 950 1" 25.3 8 16141Flexcon 140 140 2.5 484 950 1" 25.3 8 16142Flexcon 140 140 3.0 484 950 1" 25.3 8 16143Flexcon 140 140 specify 484 950 1" 25.3 8 16140Flexcon 200 200 0.5 484 1300 1" 38.1 8 16205Flexcon 200 200 1.0 484 1300 1" 38.1 8 16206Flexcon 200 200 1.5 484 1300 1" 38.1 8 16207Flexcon 200 200 2.0 484 1300 1" 38.1 8 16208Flexcon 200 200 2.5 484 1300 1" 38.1 8 16209Flexcon 200 200 3.0 484 1300 1" 38.1 8 16210Flexcon 200 200 specify 484 1300 1" 38.1 8 16200Flexcon 300 300 0.5 600 1330 1" 56.9 6 16301Flexcon 300 300 1.0 600 1330 1" 56.9 6 16302Flexcon 300 300 1.5 600 1330 1" 56.9 6 16303Flexcon 300 300 2.0 600 1330 1" 56.9 6 16304Flexcon 300 300 2.5 600 1330 1" 56.9 6 16305Flexcon 300 300 3.0 600 1330 1" 56.9 6 16306Flexcon 300 300 specify 600 1330 1" 56.9 6 16300Flexcon 425 425 0.5 790 1180 1" 76.4 1 16421Flexcon 425 425 1.0 790 1180 1" 76.4 1 16422Flexcon 425 425 1.5 790 1180 1" 76.4 1 16423Flexcon 425 425 2.0 790 1180 1" 76.4 1 16424Flexcon 425 425 2.5 790 1180 1" 76.4 1 16425Flexcon 425 425 3.0 790 1180 1" 76.4 1 16426Flexcon 425 425 specify 790 1180 1" 76.4 1 16420Flexcon 600 600 0.5 790 1540 1" 92.9 1 16601Flexcon 600 600 1.0 790 1540 1" 92.9 1 16602Flexcon 600 600 1.5 790 1540 1" 92.9 1 16603Flexcon 600 600 2.0 790 1540 1" 92.9 1 16604Flexcon 600 600 2.5 790 1540 1" 92.9 1 16605Flexcon 600 600 3.0 790 1540 1" 92.9 1 16606Flexcon 600 600 specify 790 1540 1" 92.9 1 16600Flexcon 800 800 0.5 790 1888 1" 126.9 1 16801Flexcon 800 800 1.0 790 1888 1" 126.9 1 16802Flexcon 800 800 1.5 790 1888 1" 126.9 1 16803Flexcon 800 800 2.0 790 1888 1" 126.9 1 16804Flexcon 800 800 2.5 790 1888 1" 126.9 1 16805Flexcon 800 800 3.0 790 1888 1" 126.9 1 16806Flexcon 800 800 specify 790 1888 1" 126.9 1 16800Flexcon 1000 1000 0.5 790 2268 1" 145.9 1 16901Flexcon 1000 1000 1.0 790 2268 1" 145.9 1 16902Flexcon 1000 1000 1.5 790 2268 1" 145.9 1 16903Flexcon 1000 1000 2.0 790 2268 1" 145.9 1 16904Flexcon 1000 1000 2.5 790 2268 1" 145.9 1 16905Flexcon 1000 1000 3.0 790 2268 1" 145.9 1 16906Flexcon 1000 1000 specify 790 2268 1" 145.9 1 16900

Nr. 0343

Page 19: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

34 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

Flexcon 110 - 1000 - 10.0 bar

•Maximum operating pressure: 10.0 bar.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon 110 110 0.5 484 784 1" 38.5 6 16101Flexcon 110 110 1.0 484 784 1" 38.5 6 16102Flexcon 110 110 1.5 484 784 1" 38.5 6 16103Flexcon 110 110 2.0 484 784 1" 38.5 6 16104Flexcon 110 110 2.5 484 784 1" 38.5 6 16105Flexcon 110 110 3.0 484 784 1" 38.5 6 16106Flexcon 110 110 specify 484 784 1" 38.5 6 16100Flexcon 140 140 0.5 484 950 1" 44.6 6 16131Flexcon 140 140 1.0 484 950 1" 44.6 6 16132Flexcon 140 140 1.5 484 950 1" 44.6 6 16133Flexcon 140 140 2.0 484 950 1" 44.6 6 16134Flexcon 140 140 2.5 484 950 1" 44.6 6 16135Flexcon 140 140 3.0 484 950 1" 44.6 6 16136Flexcon 140 140 specify 484 950 1" 44.6 6 16130Flexcon 200 200 0.5 600 960 1" 49.3 6 16191Flexcon 200 200 1.0 600 960 1" 49.3 6 16192Flexcon 200 200 1.5 600 960 1" 49.3 6 16193Flexcon 200 200 2.0 600 960 1" 49.3 6 16194Flexcon 200 200 2.5 600 960 1" 49.3 6 16195Flexcon 200 200 3.0 600 960 1" 49.3 6 16196Flexcon 200 200 specify 600 960 1" 49.3 6 16190Flexcon 300 300 0.5 600 1330 1" 73.7 6 16291Flexcon 300 300 1.0 600 1330 1" 73.7 6 16292Flexcon 300 300 1.5 600 1330 1" 73.7 6 16293Flexcon 300 300 2.0 600 1330 1" 73.7 6 16294Flexcon 300 300 2.5 600 1330 1" 73.7 6 16295Flexcon 300 300 3.0 600 1330 1" 73.7 6 16296Flexcon 300 300 specify 600 1330 1" 73.7 6 16290Flexcon 425 425 0.5 790 1180 1" 105.5 1 16411Flexcon 425 425 1.0 790 1180 1" 105.5 1 16412Flexcon 425 425 1.5 790 1180 1" 105.5 1 16413Flexcon 425 425 2.0 790 1180 1" 105.5 1 16414Flexcon 425 425 2.5 790 1180 1" 105.5 1 16415Flexcon 425 425 3.0 790 1180 1" 105.5 1 16416Flexcon 425 425 specify 790 1180 1" 105.5 1 16410Flexcon 600 600 0.5 790 1540 1" 132.0 1 16591Flexcon 600 600 1.0 790 1540 1" 132.0 1 16592Flexcon 600 600 1.5 790 1540 1" 132.0 1 16593Flexcon 600 600 2.0 790 1540 1" 132.0 1 16594Flexcon 600 600 2.5 790 1540 1" 132.0 1 16595Flexcon 600 600 3.0 790 1540 1" 132.0 1 16596Flexcon 600 600 specify 790 1540 1" 132.0 1 16590Flexcon 800 800 0.5 790 1888 1" 182.0 1 16791Flexcon 800 800 1.0 790 1888 1" 182.0 1 16792Flexcon 800 800 1.5 790 1888 1" 182.0 1 16793Flexcon 800 800 2.0 790 1888 1" 182.0 1 16794Flexcon 800 800 2.5 790 1888 1" 182.0 1 16795Flexcon 800 800 3.0 790 1888 1" 182.0 1 16796Flexcon 800 800 specify 790 1888 1" 182.0 1 16790Flexcon 1000 1000 0.5 790 2268 1" 210.0 1 16891Flexcon 1000 1000 1.0 790 2268 1" 210.0 1 16892Flexcon 1000 1000 1.5 790 2268 1" 210.0 1 16893Flexcon 1000 1000 2.0 790 2268 1" 210.0 1 16894Flexcon 1000 1000 2.5 790 2268 1" 210.0 1 16895Flexcon 1000 1000 3.0 790 2268 1" 210.0 1 16896Flexcon 1000 1000 specify 790 2268 1" 210.0 1 16890

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Page 20: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

35

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON TOP

For sealed heating and chilled water (cooling) installations.

When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. operating pressure: 6.0 bar.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon Top 2 - 25

•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon Top 8 8 0.5 245 280 3/4" 3.2 77 16008Flexcon Top 8 8 1.0 245 280 3/4" 3.2 50 16009Flexcon Top 8 8 2.5 245 280 3/4" 3.2 50 16010Flexcon Top 8 8 specify 245 280 3/4" 3.2 50 16011Flexcon Top 12 12 0.5 286 313 3/4" 4.5 60 16012Flexcon Top 12 12 1.0 286 313 3/4" 4.5 36 16013Flexcon Top 12 12 2.5 286 313 3/4" 4.5 36 16014Flexcon Top 12 12 specify 286 313 3/4" 4.5 36 16015Flexcon Top 18 18 0.5 328 306 3/4" 5.7 24 16018Flexcon Top 18 18 1.0 328 306 3/4" 5.7 24 16019Flexcon Top 18 18 2.5 328 306 3/4" 5.7 24 16020Flexcon Top 18 18 specify 328 306 3/4" 5.7 24 16017Flexcon Top 25 25 0.5 358 359 3/4" 7.3 18 16025Flexcon Top 25 25 1.0 358 359 3/4" 7.3 18 16026Flexcon Top 25 25 2.5 358 359 3/4" 7.3 18 16027Flexcon Top 25 25 specify 358 359 3/4" 7.3 18 16030

Flexcon Top 35 - 80

•Deep drawn zinc plated steel clench ring.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon Top 35 35 0.5 396 416 3/4" 8.8 18 16035Flexcon Top 35 35 1.0 396 416 3/4" 8.8 18 16036Flexcon Top 35 35 1.5 396 416 3/4" 8.8 18 16039Flexcon Top 35 35 2.5 396 416 3/4" 8.8 18 16037Flexcon Top 35 35 specify 396 416 3/4" 8.8 18 16038Flexcon Top 50 50 0.5 435 473 3/4" 11.2 12 16051Flexcon Top 50 50 1.0 435 473 3/4" 11.2 12 16052Flexcon Top 50 50 1.5 435 473 3/4" 11.2 12 16050Flexcon Top 50 50 2.5 435 473 3/4" 11.2 12 16053Flexcon Top 50 50 specify 435 473 3/4" 11.2 12 16054Flexcon Top 80 80 0.5 519 540 1" 15.0 12 16081Flexcon Top 80 80 1.5 519 540 1" 15.0 12 16085Flexcon Top 80 80 2.5 519 540 1" 15.0 12 16083Flexcon Top 80 80 specify 519 540 1" 15.0 12 16084

Nr. 0343

Nr. 0343

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36 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

FLEXCON SOLAR

Expansion vessels for solar powered installations.

•Suitable for addition of glycol-based anti-freeze up to 50%.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon Solar 8 - 25

•Deep drawn zinc plated steel clench ring.•White (RAL 9010) epoxy powder coating.•Maximum operating pressure: 8.0 bar.•Maximum temperature load on the diaphragm: 110 °C.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon Solar 8 8 2.5 245 280 3/4" 3.2 50 16060Flexcon Solar 12 12 2.5 286 313 3/4" 4.3 36 16061Flexcon Solar 18 18 2.5 328 306 3/4" 5.7 24 16062Flexcon Solar 25 25 2.5 358 359 3/4" 7.3 18 16063

Flexcon Solar 35 - 80

•Deep drawn zinc plated steel clench ring.•White (RAL 9010) epoxy powder coating.•Maximum operating pressure: 8.0 bar.•Maximum temperature load on the diaphragm: 110 °C.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon Solar 35 35 2.5 396 416 3/4" 8.8 18 16064Flexcon Solar 50 50 2.5 435 473 3/4" 11.2 12 16065Flexcon Solar 80 80 2.5 519 540 1" 15.0 12 16066

Flexcon Solar 110 - 1000

•All welded construction.•Red (RAL 3002) epoxy powder coating.•Maximum operating pressure: 10.0 bar.•Maximum temperature load on the diaphragm (EN 13831/8): 70 °C.

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon Solar 110 110 3.0 484 784 1" 38.5 8 16067Flexcon Solar 140 140 3.0 484 950 1" 44.6 8 16068Flexcon Solar 200 200 3.0 600 960 1" 49.3 8 16069Flexcon Solar 300 300 3.0 600 1330 1" 73.7 6 16070Flexcon Solar 425 425 3.0 790 1180 1" 105.5 1 16071Flexcon Solar 600 600 3.0 790 1540 1" 132.0 1 16072Flexcon Solar 800 800 3.0 790 1888 1" 181.8 1 16073Flexcon Solar 1000 1000 3.0 790 2268 1" 211.0 1 16074

Nr. 0343

Nr. 0343

Nr. 0343

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37

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

CUBEX R

For sealed heating and chilled water (cooling) installations.

When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

•Deep drawn zinc plated steel clench ring.•Diaphragm: Flexible rubber with rolling action.•Suitable for addition of glycol-based anti-freeze up to 50%.•Max. operating pressure: 3.0 bar.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.

Cubex R

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Cubex R 12 12 0.5 387 133 3/4" 5.1 48 13212Cubex R 14 14 0.5 387 153 3/4" 5.3 48 13214Cubex R 18 18 0.5 387 183 3/4" 6.4 48 13218

FLEXCON P

Expansion vessel with reduced height and suspension eye for use in sealed heating and cooling installations.

When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.

• The oval shape combined with the practical suspension eye enables quick and easy mounting, optimising the use of space.• Thanks to the design no rest water remains in the vessel.

•Deep drawn zinc plated steel clench ring.•Suitable for addition of glycol based anti freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. working pressure: 3.0 bar.•Max. temperature on diaphragm (EN 13831): 90 °C.•Max. temperature at (heating) outlet: 120 °C.•Vessel of high tensile steel.•Diaphragm material: butyl rubber.• In accordance with Pressure Equipment Directive 97/23/EC.

Flexcon P

Type Capa-city[l]

Pre-charge[bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon P 18 18 1.0 387 226 3/4" 5.7 30 13316Flexcon P 25 25 1.0 435 256 3/4" 7.7 20 13326Flexcon P 35 35 1.0 435 333 3/4" 8.9 20 13336Flexcon P 50 50 1.5 515 344 3/4" 11.8 12 13357

Nr. 0343

Nr. 0343

Page 23: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

38 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

FLEXCON M

For heating and chilled water (cooling) installations.

The vessel is equipped with a replaceable bladder made from high-quality butyl rubber in compliance with EN 13831/8. Particularbenefitsofuseareachievedininstallationswithlargevariationsbetweenstaticpressureandpre-setpressureofthesafety valve. Accessories to be ordered separately.

•Replaceable bladder.•With inspection cover and pressure gauge.•With height-adjustable feet (From 2,800 litres).•Delivered ready for connecting to system.

•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.•Material quality:

- ASTM/ISO: A181 class 60 / S235JRG2.

Flexcon M - 6.0 bar

•Maximum operating pressure: 6.0 bar.

Type Capa-city[l]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon M 80 80 450 770 1" 40 1 22101Flexcon M 400 400 750 1335 1 1/4" 115 1 22104Flexcon M 600 600 750 1755 1 1/4" 145 1 22105Flexcon M 800 800 750 2155 1 1/4" 180 1 22106Flexcon M 1000 1000 750 2710 1 1/2" 215 1 22107Flexcon M 1200 1200 1000 1940 1 1/2" 285 1 22108Flexcon M 1600 1600 1000 2440 1 1/2" 340 1 22109Flexcon M 2000 2000 1200 2180 2" 425 1 22110Flexcon M 2800 2800 1200 2780 2 1/2" 510 1 22118Flexcon M 3500 3500 1200 3580 2 1/2" 620 1 22111Flexcon M 5200 5200 1500 3560 2 1/2" 1050 1 22112Flexcon M 6700 6700 1500 4450 DN 100 * 1200 1 22113Flexcon M 8000 8000 1500 5090 DN 100 * 1410 1 22114

* Flanges as per EN 1092-1 PN 16.

Flexcon M - 10.0 bar

•Maximum operating pressure: 10.0 bar.

Type Capa-city[l]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon M 80 80 450 770 1" 40 1 22141Flexcon M 400 400 750 1335 1 1/4" 160 1 22144Flexcon M 600 600 750 1755 1 1/4" 200 1 22145Flexcon M 800 800 750 2155 1 1/4" 250 1 22146Flexcon M 1000 1000 750 2710 1 1/2" 300 1 22147Flexcon M 1000 1000 1000 1690 1 1/2" 385 1 22155Flexcon M 1200 1200 1000 1940 1 1/2" 410 1 22148Flexcon M 1600 1600 1000 2440 1 1/2" 485 1 22149Flexcon M 2000 2000 1200 2180 2" 600 1 22150Flexcon M 2800 2800 1200 2780 2 1/2" 725 1 22158Flexcon M 3500 3500 1200 3580 2 1/2" 900 1 22151Flexcon M 5200 5200 1500 3600 2 1/2" 1330 1 22152Flexcon M 6700 6700 1500 4480 DN 100 * 1690 1 22153Flexcon M 8000 8000 1500 5090 DN 100 * 2140 1 22154

* Flanges as per EN 1092-1 PN 16.

A Flexcon M expansion vessel offers you advantages in installations with big differences in the static pressure and set pressureof the safety valve.

All Flexcon M expansion vessels are fitted with an exchangeable bladder. This bladder forms the separation between the expansion water inside the bladder and the nitrogen cushion.

Systems with more than one boiler:1. Flexcon expansion vessel (depending on boiler capacity).2. Prescor safety valve or Prescomano.3. Flamco tundish.4. Flexcon Connection Assembly ½".5. Flexcon pressure gauge or combined pressure gauge/thermometer.6. Flamco venting equipment.7. One or more Flexcon M vessels.8. Flamco pressurisation unit.

The Flexcon M’s flange construction allows you to replace the butyl-rubberbladder.

As an option, the Flexcon M expansion vessel can be fitted with a Flexvent SuperAutomatic Air Vent.

From 2,800 litres all Flexcon M expansion vessels are fitted with an adjustable foot.

High efficiency means that the capacity of the vessel is used to best effect.

Each Flexcon M expansion vessel is fitted with a pressure gauge as standard.

Flexcon M

FLEXCON M

Page 24: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

39

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON M

For heating and chilled water (cooling) installations.

The vessel is equipped with a replaceable bladder made from high-quality butyl rubber in compliance with EN 13831/8. Particularbenefitsofuseareachievedininstallationswithlargevariationsbetweenstaticpressureandpre-setpressureofthesafety valve. Accessories to be ordered separately.

•Replaceable bladder.•With inspection cover and pressure gauge.•With height-adjustable feet (From 2,800 litres).•Delivered ready for connecting to system.

•Suitable for addition of glycol-based anti-freeze up to 50%.•Red (RAL 3002) epoxy powder coating.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.•Material quality:

- ASTM/ISO: A181 class 60 / S235JRG2.

Flexcon M - 6.0 bar

•Maximum operating pressure: 6.0 bar.

Type Capa-city[l]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon M 80 80 450 770 1" 40 1 22101Flexcon M 400 400 750 1335 1 1/4" 115 1 22104Flexcon M 600 600 750 1755 1 1/4" 145 1 22105Flexcon M 800 800 750 2155 1 1/4" 180 1 22106Flexcon M 1000 1000 750 2710 1 1/2" 215 1 22107Flexcon M 1200 1200 1000 1940 1 1/2" 285 1 22108Flexcon M 1600 1600 1000 2440 1 1/2" 340 1 22109Flexcon M 2000 2000 1200 2180 2" 425 1 22110Flexcon M 2800 2800 1200 2780 2 1/2" 510 1 22118Flexcon M 3500 3500 1200 3580 2 1/2" 620 1 22111Flexcon M 5200 5200 1500 3560 2 1/2" 1050 1 22112Flexcon M 6700 6700 1500 4450 DN 100 * 1200 1 22113Flexcon M 8000 8000 1500 5090 DN 100 * 1410 1 22114

* Flanges as per EN 1092-1 PN 16.

Flexcon M - 10.0 bar

•Maximum operating pressure: 10.0 bar.

Type Capa-city[l]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon M 80 80 450 770 1" 40 1 22141Flexcon M 400 400 750 1335 1 1/4" 160 1 22144Flexcon M 600 600 750 1755 1 1/4" 200 1 22145Flexcon M 800 800 750 2155 1 1/4" 250 1 22146Flexcon M 1000 1000 750 2710 1 1/2" 300 1 22147Flexcon M 1000 1000 1000 1690 1 1/2" 385 1 22155Flexcon M 1200 1200 1000 1940 1 1/2" 410 1 22148Flexcon M 1600 1600 1000 2440 1 1/2" 485 1 22149Flexcon M 2000 2000 1200 2180 2" 600 1 22150Flexcon M 2800 2800 1200 2780 2 1/2" 725 1 22158Flexcon M 3500 3500 1200 3580 2 1/2" 900 1 22151Flexcon M 5200 5200 1500 3600 2 1/2" 1330 1 22152Flexcon M 6700 6700 1500 4480 DN 100 * 1690 1 22153Flexcon M 8000 8000 1500 5090 DN 100 * 2140 1 22154

* Flanges as per EN 1092-1 PN 16.

A Flexcon M expansion vessel offers you advantages in installations with big differences in the static pressure and set pressureof the safety valve.

All Flexcon M expansion vessels are fitted with an exchangeable bladder. This bladder forms the separation between the expansion water inside the bladder and the nitrogen cushion.

Systems with more than one boiler:1. Flexcon expansion vessel (depending on boiler capacity).2. Prescor safety valve or Prescomano.3. Flamco tundish.4. Flexcon Connection Assembly ½".5. Flexcon pressure gauge or combined pressure gauge/thermometer.6. Flamco venting equipment.7. One or more Flexcon M vessels.8. Flamco pressurisation unit.

The Flexcon M’s flange construction allows you to replace the butyl-rubberbladder.

As an option, the Flexcon M expansion vessel can be fitted with a Flexvent SuperAutomatic Air Vent.

From 2,800 litres all Flexcon M expansion vessels are fitted with an adjustable foot.

High efficiency means that the capacity of the vessel is used to best effect.

Each Flexcon M expansion vessel is fitted with a pressure gauge as standard.

Flexcon M

FLEXCON M

Page 25: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

40 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

FLEXCON PRO

For heating and chilled water (cooling) installations.

•Replaceable bladder.•Red (RAL 3002) epoxy powder coating.•Suitable for addition of glycol-based anti-freeze up to 50%.•Max. operating pressure: 6.0 bar.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.•Material quality: ASTM/ISO: A181 class 60 / S235JRG2.

Flexcon PRO

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon PRO 200 200 2.5 550 1150 1" 47 1 25420Flexcon PRO 250 250 2.5 550 1400 1" 55 1 25425Flexcon PRO 300 300 2.5 550 1650 1" 63 1 25430Flexcon PRO 370 370 2.5 650 1350 1" 74 1 25431Flexcon PRO 430 430 2.5 750 1170 1" 87 1 25443Flexcon PRO 540 540 2.5 750 1420 1" 108 1 25454Flexcon PRO 650 650 2.5 750 1670 1" 125 1 25465Flexcon PRO 770 770 2.5 750 1950 1" 153 1 25477Flexcon PRO 870 870 2.5 750 2200 1" 172 1 25487Flexcon PRO 1000 1000 2.5 750 2450 1" 180 1 25500

FLEXCON PRO

A Flexcon Pro expansion vessel offers you extra-special advantages in installations with big differences in the static pressure and set pressureof the safety valve.

Systems with more than one boiler:1. Flexcon expansion vessel (depending on boiler capacity).2. Prescor safety valve or Prescomano.3. Flamco tundish.4. Flexcon Connection Assembly ½".5. Flexcon pressure gauge or combined pressure gauge/thermometer.6. Flamco venting equipment.7. One or more Flexcon M vessels.8. Flamco automatic top-up unit.

Diaphragm pressure expansion vessel with an exchangeable bladder according to DIN 4807/3.For the use in heating installations with a working temperature of 120 °C (maximum temperature (bladder) of 70 °C) and for chilled water (cooling and airconditioning) installations.

From 770 liters or more the Flexcon Pro expansion vessels are fitted with a pressure gauge.

High efficiency means that the capacity of the expansion vessel is used to best effect.

Thanks to its threaded connection,a Flexcon Pro expansion vesselcan be installed easily and cost-effectively onto the system.

1

2

5

6

43

78

Flexcon Pro

Page 26: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

41

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON PRO

For heating and chilled water (cooling) installations.

•Replaceable bladder.•Red (RAL 3002) epoxy powder coating.•Suitable for addition of glycol-based anti-freeze up to 50%.•Max. operating pressure: 6.0 bar.•Max. temperature on diaphragm (EN 13831/8): 70 °C.•Max. temperature at (heating) outlet: 120 °C.• In accordance with Pressure Equipment Directive 97/23/EC.•Material quality: ASTM/ISO: A181 class 60 / S235JRG2.

Flexcon PRO

Type Capa-city[l]

Pre-charge [bar]

Dimensions Syst.conn.

(M)

Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Flexcon PRO 200 200 2.5 550 1150 1" 47 1 25420Flexcon PRO 250 250 2.5 550 1400 1" 55 1 25425Flexcon PRO 300 300 2.5 550 1650 1" 63 1 25430Flexcon PRO 370 370 2.5 650 1350 1" 74 1 25431Flexcon PRO 430 430 2.5 750 1170 1" 87 1 25443Flexcon PRO 540 540 2.5 750 1420 1" 108 1 25454Flexcon PRO 650 650 2.5 750 1670 1" 125 1 25465Flexcon PRO 770 770 2.5 750 1950 1" 153 1 25477Flexcon PRO 870 870 2.5 750 2200 1" 172 1 25487Flexcon PRO 1000 1000 2.5 750 2450 1" 180 1 25500

FLEXCON PRO

A Flexcon Pro expansion vessel offers you extra-special advantages in installations with big differences in the static pressure and set pressureof the safety valve.

Systems with more than one boiler:1. Flexcon expansion vessel (depending on boiler capacity).2. Prescor safety valve or Prescomano.3. Flamco tundish.4. Flexcon Connection Assembly ½".5. Flexcon pressure gauge or combined pressure gauge/thermometer.6. Flamco venting equipment.7. One or more Flexcon M vessels.8. Flamco automatic top-up unit.

Diaphragm pressure expansion vessel with an exchangeable bladder according to DIN 4807/3.For the use in heating installations with a working temperature of 120 °C (maximum temperature (bladder) of 70 °C) and for chilled water (cooling and airconditioning) installations.

From 770 liters or more the Flexcon Pro expansion vessels are fitted with a pressure gauge.

High efficiency means that the capacity of the expansion vessel is used to best effect.

Thanks to its threaded connection,a Flexcon Pro expansion vesselcan be installed easily and cost-effectively onto the system.

1

2

5

6

43

78

Flexcon Pro

Page 27: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

42 Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

In sealed heating systems, the supply temperature can reach 120 °C. The maximum permissible continuous temperature load on the diaphragm in the Flexcon vessels is 70 °C in compliance with the appropriate standard. That is why Flexcon expansion vessels must be fitted in the return line. If the temperature in the return line is not capped at 70 °C, an intermediate vessel must be fitted.

In this intermediate vessel the expansion water is allowed to cool. The maximum supply temperature of the water for Flexcon VSV/VB vessels is 160 °C. The extent to which the expansion water is cooled depends on the volume of the intermediate vessel. An intermediate vessel must not be insulated. Around the vessel and between the vessel and the ceiling there must be clearance of at least 400 mm.

Calculation for a Flexcon VSV/VB intermediate vesselThe required volume of a Flexcon VSV/VB intermediate vessel depends on the supply temperature and a percentage of the net expansion volume as per the table below.

Example calculation for a Flexcon intermediate vessel

Data: - expansion volume = 1.740 litres- supply temperature (105/95 °C) = 105 °C

Calculation:Required vessel volume = 15% of the expansion volume

15 x 1.740= ––––––––––– = 261 litres 100

The ideal intermediate vessel is thus the Flexcon VSV 350.

Flexcon VSV/VB Intermediate Vessels

FLEXCON VSV

(Automatic) Vent

DrainExpansion

line

Supply temperature Flexcon intermediate vessel volume % of the net expansion volume

90 - 110 °C 15111 - 125 °C 25126 - 140 °C 40141 - 150 °C 60

System water flows from the installation into the top of the intermediate vessel.

The hot water mixes in the vessel with the cold water already in the vessel.

From the bottom of the vessel, significantly cooler water is fed into the expansion vessel.

The temperature of the expansion water that is supplied to the Flexcon expansion tank remains under the maximum temperature permissible for the membrane.

Flexcon intermediate vessel connection diagramThe intermediate vessel functions according to the principle that hot water is lighter than cold water. As the intermediate vessel is filled with water from the top, the heat will be concentrated there. System water that has been allowed to cool will, due to its greater density, fall and this cooler water will naturally be forced towards the connection on the underside of the expansion vessel.

Page 28: Expansion Vessels - Flamco Group · PDF fileexpansion vessel connection to the highest point of the system measured in water column metres, (1 wcm 0.1 bar). Vessel Calculation for

43

Expansion Vessels

Product overview • 2013 We reserve the right to change designs and technical specifications of our products.

1

FLEXCON INTERMEDIATE VESSELS

Vessels to protect Flexcon expansion vessels on elevated temperature systems. Thevesselsarefittedinbetweentheexpansionvesselandthesystemreturn.

•Red (RAL 3002) epoxy powder coating.•Suitable for addition of glycol-based anti-freeze up to 50%.• In accordance with Pressure Equipment Directive 97/23/EC.•Material quality: ASTM/ISO: A181 class 60 / S235JRG2.

Flexcon VSV - 6.0 bar

•Maximum working temperature (design): 160 °C.

Type Capa-city[l]

Dimensions Connection to Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Vessel(F)

System (F)

Flexcon VSV 200 200 484 1304 1 1/2" 1 1/2" 36 1 23380Flexcon VSV 350 350 484 2124 1 1/2" 1 1/2" 55 1 23381Flexcon VSV 500 500 600 2025 2" 2" 64 1 23382Flexcon VSV 750 750 790 1863 2" 2" 96 1 23383Flexcon VSV 1000 1000 790 2238 2" 2" 114 1 23384

Flexcon VSV - 10.0 bar

•Maximum working temperature (design): 160 °C.

Type Capa-city[l]

Dimensions Connection to Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Vessel(F)

System (F)

Flexcon VSV 200 200 484 1304 1 1/2" 1 1/2" 51 1 23300Flexcon VSV 350 350 484 2124 1 1/2" 1 1/2" 80 1 23301Flexcon VSV 500 500 600 2025 2" 2" 96 1 23302Flexcon VSV 750 750 790 1863 2" 2" 142 1 23303Flexcon VSV 1000 1000 790 2238 2" 2" 172 1 23304

Flexcon V-B - 6.0 bar

•Maximum working temperature (design): 120 °C.

Type Capa-city[l]

Dimensions Connection Weight[kg]

OrderCode

Ø[mm]

H.[mm]

Vessel(M)

System (F)

V-B 1600 1600 1000 2480 1 1/2" 1 1/2" 340 1 22717V-B 2000 2000 1200 2220 2" 2" 425 1 22718

Flexcon V-B - 10.0 bar

•Maximum working temperature (design): 160 °C.

Type Capacity[l]

Dimensions Connection OrderCode

Ø[mm]

H.[mm]

Vessel(M)

System (F)

V-B 1600 1600 1000 2700 1 1/2" 1 1/2" 1 22737V-B 2000 2000 1200 2435 2" 2" 1 22738

Nr. 0343

Nr. 0343