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Gas The innovative solution for Manual Wavin Tigris Gas PE-X/AL PRESS FITTING SYSTEM FOR GAS PIPES IN BUILDINGS EPIC G111 X71 May 2009

Tigris Gas Manual en Final

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GasThe innovative solution for

ManualWavin Tigris Gas

PE-X/AL PRESS FITTING SYSTEM

FOR GAS PIPES IN BUILDINGS

EPICG111 X71

May 2009

Contents

1. General page 21.1. Introduction page 21.2. The Wavin PE-X/Al pipe page 21.3. The Wavin Tigris gas press fitting page 21.4. The benefits of Wavin Tigris page 31.5. Expected service life and guarantee page 31.6. Quality marks page 3

2. Design page 32.1. Location of the pipes page 32.2. Function of the pipe sleeve page 42.3. Earthing page 42.4. Shut-off valves page 42.5. Determining pipe diameter page 42.6. General rules on noise page 7

3. Installing the Wavin PE-X/Al pipe system page 83.1. Expansion and fixing page 83.2. Bending of Wavin PE-X/Al pipes page 93.3. Making connections page 103.4. Pressing tool page 103.5. Threaded connections page 103.6. Protecting against external influences page 113.7. Pressure testing page 11

4. Technical data page 12

Branches page 12

1Gas

Wavin Tigris Gas manualContents

TEL.www.wavinoverseas.com

Wavin Tigris Gas manual

General

1. General

1.1. Introduction

The Wavin Tigris Gas System can be

used for installing permanent gas pipes

within domestic buildings, in compliance

with NEN 1078 and NEN 8078, with a

maximum pressure of 200 mbar. This

means the system is suitable for gas

piping having a nominal operating

pressure of 25 or 100 mbar.

The Wavin Tigris Gas System is not

intended for use in industrial and

agricultural applications.

1.2. The Wavin PE-X/Al pipe

Wavin PE-X/Al pipes consist of five

layers.

The centre of the pipe has a butt welded

aluminium pipe as its core. The

aluminium pipe is butt welded offering a

consistent wall thickness. The inner

layer is made of PE-Xc, electron beam

cross-linked PE.

Naturally, the Wavin PE-X/Al pipe

cannot and must not be used as an

earth pipe.

Wavin PE-X/Al pipes can easily be bent

by hand using a pipe bending spring or

pliers. The pipe retains its shape and

does not spring back after bending.

This makes it easy to bend the pipe

around obstacles without tension,

reducing the need for fittings and

lowering flow resistance.

The pipe is usually laid directly from a

coil so it can be installed quickly and

few fittings are required. Wavin PE-X/Al

can be supplied in straight lengths for

visible parts or in conduit to meet local

regulations.

1.3. The Wavin Tigrisgas press fitting

Wavin Tigris press fittings are made of

brass. The fittings have a stainless steel

sleeve. This sleeve has an inspection

window that allows the correct insertion

depth of the pipe to be checked during

pressing work. Sealing is done with two

O-rings.

2 TEL.+31 (0)523-624 911

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Fig. 1. Wavin PE-X/Al pipe

Fig. 2. Through the inspection window

you can see that the pipe has

been inserted far enough

Fig. 3. The Wavin Tigris fitting with

pressed ferrule

Fig. 4. The Wavin Tigris threaded fitting

fitting, and the window on the sleeve

can be used to see whether the pipe is

inserted far enough into the fitting.

The O-ring on the bushing ensures that

the fitting is now completely gastight.

In order to tighten the connection

permanently, pressing tongs are used to

deform the ferrule to clearly show it has

been pressed.

The brass threaded fittings have a

yellow ring that also prevents contact

corrosion between the brass fitting and

the aluminium layer of the pipe. The

threaded fittings are used to connect

valves or appliances and for junctions

with other materials.

Cross-linking improves the PE in terms

of temperature resistance and service

life. The robust outer layer consists of

PE-Xb, which prevents the aluminium

layer from becoming exposed to

the atmosphere. As a result, the

Wavin PEX/Al pipe is resistant to all

forms of corrosion, aging and

weathering. The outer layer of the pipe

is yellow so it can be recognised easily.

A special adhesive is used to bond both

PE layers to the aluminium core for the

duration of its service life.

The programme includes a calibration

and trimming tool: when used correctly,

the pipe is free from burrs and no

burrs can enter the pipe. The trimmed

pipe is pushed onto the spigot of the

Wavin Tigris Gas manual

Design

2. Design

1.4. The benefits of WavinTigris

The pipes and fittings combine the

benefits of plastic and metal to produce

an optimum product. The key benefits

of the system are:

High corrosion resistance

Shape retention but can still be bent

by hand

Minimum expansion

Diffusion-tight seal

Rapid and easy assembly

(inspection window for checking)

Fitter-independent O-ring seal

Simple, uncomplicated pressing

technique (deformation of the ferrule

visible after pressing)

No risk of burrs in the pipe

No fire hazard because the

connections are fitted without heat

or flame

Low labour costs, particularly when

working with coils

1.5. Expected service lifeand guarantee

Wavin PE-X/Al pipes and Wavin Tigris

gas fittings are designed for a minimum

service life of 50 years.

Regardless, if the pipes are installed

professionally in accordance with

Wavin's work instructions, Wavin

provides a 10-year guarantee from the

date of delivery on material defects in

Wavin pipes and fittings (see guarantee

conditions).

1.6. Quality marks

Wavin PE-X/Al pipes and Wavin Tigris

have a GASKEUR approval (issued by

GASTEC) for use as a gas pipe system.

2.1. Location of the pipes

Wavin Tigris gas pipes must be

protected against mechanical damage.

In many markets, gas pipes must only

be visible in the meter cupboard and

nowhere else. In that case, the pipe

must be fitted with a pipe sleeve or

another type of encapsulation or

sheath. The pipes are usually concealed

in the walls or floors of new buildings.

We recommend that a pipe sleeve is

fitted around the pipe as well here to

prevent damage during the building

phase.

In principle, gas pipes may be laid in

the ground unprotected, but we

recommend that pipe sleeves are also

fitted on the pipes here to prevent the

risk of damage during digging work.

NPR 3378-7 states that pipes must not

be laid in the ground under buildings,

with the exception of horticultural

greenhouses.

Brass fittings for underground pipes

must be taped up to protect them

against moisture. Pipes in inaccessible

spaces such as above fixed ceilings

and behind panelling must be enclosed

in a pipe sleeve. The inside diameter of

the pipe sleeve must be at least 10 mm

greater than the outside diameter of the

gas pipe (there must be a 5 mm

clearance around the pipe). The pipe

sleeve must protrude from the wall by

at least 20 mm and be open on both

sides. No metal pipes or fittings must

be used in crawl spaces. Wavin Tigris

gas pipes in pipe sleeves may be laid in

crawl spaces (without fittings).

TEL.www.wavinoverseas.com

3Gas

Fig. 5. In inaccessible spaces, the gas

pipe must be inserted in a pipe

sleeve.

The pipe must have at least 6 mm

clearance in the pipe sleeve.

Do not bend pipe over hard,

sharp edges (see arrow)

Wavin Tigris Gas manual

Design

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2.2. Function of the pipesleeve

1. To protect pipes during use:

exposed pipes.

2. To protect pipes during installation:

embedded pipes.

3. To make it simple to replace pipes:

pipes that cross walls or floors,

pipes in inaccessible spaces.

The pipe should run as straight as

possible to make replacement

possible. The ends of the pipe sleeve

must provide gas resistance through

walls and brickwork and protrude

from the wall by at least 20 mm.

4. To ensure that no gas escapes to

inaccessible spaces if there is a leak.

The above functions will be combined

in a number of cases.

If a pipe sleeve is used, you must

ensure that, if there is a leak, the gas

between the pipe sleeve and gas pipe

is able to escape to an accessible and

ventilated area.

With wall and floor lead-throughs, the

pipe sleeve must protrude by at least

20 mm.

2.3. Earthing

Wavin Tigris gas pipes cannot and must

not be earthed. Although the pipe

contains a metal layer (aluminium), this

is completely shielded and therefore

insulated by the outer PE-Xb layer.

Earthing this would result in damage to

the outer layer and risk of corrosion.

2.4. Shut-off valves

NPR 3378 specifies where shut-off

valves must be fitted in the gas pipe.

For houses, this means that a shut-off

valve must be fitted by the entrance to

a house or housing unit (main cock) and

for each individual gas appliance. The

shut-off valve for a gas appliance can

also be used for this purpose. For other

situations please see NPR 3378-5.

If only gas appliances with a flame

failure device have been used, then a

low-pressure shut-off valve is not

needed.

In houses where not all appliances are

fitted with a flame failure device, it is

sufficient to have one low-pressure

shut-off valve immediately behind the

main valve.

2.5. Determining pipediameter

The loss in pressure from the main

valve to each individual consumer

appliance must not exceed 1.7 mbar.

The diameter of the different gas pipes

must therefore be chosen in order to

comply with this. The pressure loss

depends on the flow rate and therefore

the required capacity, the pipe length

and the number of fittings.

Each design starts with a sketch of the

required pipe route and a decision on

the load of the various appliances

connected. If several appliances are

connected to a specific route, the total

load is taken. In a limited number of

cases, a simultaneity factor may be

used in calculations, as it can be

assumed that not all appliances will be

used at the same time (see Figure 6).

Once the load for each pipe section is

known, a pipe diameter can be chosen.

(To make an initial choice, dividing

1.7 mbar by the length of the longest

pipe section calculates the required

pressure loss per metre, and the table

in Figure 7 can then be used to select

a diameter).

The pressure loss table in Figure 7 and

incorporation of the pressure losses of

any fittings in accordance with Figure 8

are then used to check whether the

total pressure loss to each appliance

remains under 1.7 mbar. If the loss of

pressure is too great, then a larger

diameter will need to be chosen for at

least part of the pipe. In most cases,

this will be the section where the

greatest flow rate occurs.

In practice, a 16 mm pipe diameter

seems to be sufficient up to 10 kW,

a 20 mm diameter up to 20 kW and a

25 mm diameter up to 40 kW.

Fig. 6. Permissible simultaneity factors for gas pipes. In all other cases,

calculations must be made with a simultaneity factor of 1.

Pipe to gas stove 0.7

Pipe section for three or more appliances 0.8 (but at least equal to the following section)

Wavin Tigris Gas manual

Design

TEL.www.wavinoverseas.com

5Gas

Fig. 7. Pressure loss per metre of Wavin Tigris gas pipes

Connected Required Required 16 20 25load volume flow volume flow speed Pressure loss speed Pressure loss speed Pressure loss(kW) m3/s m3/h m/s mbar/m m/s mbar/m m/s mbar/m

1 0.00003 0.10 0.25 0.00 0.15 0.00 0.09 0.002 0.00006 0.21 0.50 0.00 0.30 0.00 0.18 0.003 0.00009 0.31 0.76 0.01 0.45 0.00 0.27 0.004 0.00011 0.41 1.01 0.02 0.60 0.00 0.36 0.005 0.00014 0.51 1.26 0.03 0.76 0.01 0.45 0.006 0.00017 0.62 1.51 0.04 0.91 0.01 0.54 0.007 0.00020 0.72 1.76 0.05 1.06 0.01 0.63 0.008 0.00023 0.82 2.02 0.07 1.21 0.02 0.73 0.019 0.00026 0.92 2.27 0.08 1.36 0.02 0.82 0.01

10 0.00028 1.03 2.52 0.10 1.51 0.03 0.91 0.0111 0.00031 1.13 2.77 0.12 1.66 0.03 1.00 0.0112 0.00034 1.23 3.02 0.15 1.81 0.04 1.09 0.0113 0.00037 1.33 3.28 0.17 1.96 0.05 1.18 0.0114 0.00040 1.44 3.53 0.20 2.11 0.06 1.27 0.0215 0.00043 1.54 3.78 0.23 2.27 0.06 1.36 0.0216 0.00046 1.64 4.03 0.26 2.42 0.07 1.45 0.0217 0.00048 1.74 4.28 0.30 2.57 0.08 1.54 0.0218 0.00051 1.85 4.53 0.33 2.72 0.09 1.63 0.0319 0.00054 1.95 4.79 0.37 2.87 0.10 1.72 0.0320 0.00057 2.05 5.04 0.41 3.02 0.11 1.81 0.0321 0.00060 2.15 5.29 0.45 3.17 0.13 1.90 0.0422 0.00063 2.26 5.54 0.49 3.32 0.14 2.00 0.0423 0.00066 2.36 5.79 0.54 3.47 0.15 2.09 0.0424 0.00068 2.46 6.05 0.59 3.62 0.16 2.18 0.0525 0.00071 2.56 6.30 0.64 3.78 0.18 2.27 0.0526 0.00074 2.67 6.55 0.69 3.93 0.19 2.36 0.0527 0.00077 2.77 6.80 0.74 4.08 0.21 2.45 0.0628 0.00080 2.87 7.05 0.80 4.23 0.22 2.54 0.0629 0.00083 2.97 7.31 0.86 4.38 0.24 2.63 0.0730 0.00085 3.08 7.56 0.92 4.53 0.26 2.72 0.0731 0.00088 3.18 7.81 0.98 4.68 0.27 2.81 0.0832 0.00091 3.28 8.06 1.05 4.83 0.29 2.90 0.0833 0.00094 3.38 8.31 1.11 4.98 0.31 2.99 0.0934 0.00097 3.49 8.57 1.18 5.13 0.33 3.08 0.0935 0.00100 3.59 8.82 1.25 5.29 0.35 3.17 0.1036 0.00103 3.69 9.07 1.32 5.44 0.37 3.27 0.1037 0.00105 3.79 9.32 1.40 5.59 0.39 3.36 0.1138 0.00108 3.90 9.57 1.47 5.74 0.41 3.45 0.1139 0.00111 4.00 9.83 1.55 5.89 0.43 3.54 0.1240 0.00114 4.10 10.08 1.63 6.04 0.45 3.63 0.1341 0.00117 4.21 10.33 1.72 6.19 0.48 3.72 0.1342 0.00120 4.31 10.58 1.80 6.34 0.50 3.81 0.1443 0.00123 4.41 10.83 1.89 6.49 0.53 3.90 0.1544 0.00125 4.51 11.09 1.98 6.64 0.55 3.99 0.1545 0.00128 4.62 11.34 2.07 6.80 0.57 4.08 0.1646 0.00131 4.72 11.59 2.16 6.95 0.60 4.17 0.1747 0.00134 4.82 11.84 2.26 7.10 0.63 4.26 0.1848 0.00137 4.92 12.09 2.35 7.25 0.65 4.35 0.1849 0.00140 5.03 12.34 2.45 7.40 0.68 4.44 0.1950 0.00142 5.13 12.60 2.55 7.55 0.71 4.53 0.2051 0.00145 5.23 12.85 2.66 7.70 0.74 4.63 0.2152 0.00148 5.33 13.10 2.76 7.85 0.77 4.72 0.2153 0.00151 5.44 13.35 2.87 8.00 0.80 4.81 0.2254 0.00154 5.54 13.60 2.98 8.15 0.83 4.90 0.2355 0.00157 5.64 13.86 3.09 8.31 0.86 4.99 0.2456 0.00160 5.74 14.11 3.21 8.46 0.89 5.08 0.2557 0.00162 5.85 14.36 3.32 8.61 0.92 5.17 0.2658 0.00165 5.95 14.61 3.44 8.76 0.96 5.26 0.2759 0.00168 6.05 14.86 3.56 8.91 0.99 5.35 0.2860 0.00171 6.15 15.12 3.68 9.06 1.02 5.44 0.29

Example calculation,

see Figure 9.

House with a central heating system

of 34 kW and a stove of 14 kW.

Wavin Tigris Gas manual

Design

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Stove14 kW

CV34 kW

C (10 kW)

6 m

A (44 kW)

B (34 kW)

8 m

2 m

6 3

4

21

5

12345

A simultaneity factor of 0.7 applies to the stove;

so calculations can be made with 0.7 x 14 = 10 kW.

Pipe section C therefore transports 10 kW,

pipe section B 34 kW and pipe section A 44 kW.

The longest section A + B has a length of 10 m.

Total pressure loss must not exceed 1.7 mbar, which is

0.17 mbar/m.

In Figure 7, find the pipe for 44 kW. Pipe 20 has a pressure

loss of 0.55 mbar/m and therefore does not comply. Pipe

25 has a pressure loss of 0.15 mbar/m and therefore does

comply. Pipe 25 is chosen for pipe section A.

20 mm appears to be too small for pipe section B, 34 kW.

This has a pressure loss of 0.33 mbar/m, which means

that the pressure loss for B would be 2.64 mbar with a

length of 8 m. This is why 25 mm is also chosen for pipe

section B.

Fig. 8. Resistance factors and equivalent

pipe length of Wavin Tigris gas

fittings

Fig. 9. Example of pipe route

RReessiissttaannccee EEqquuiivvaalleenntt

λ ((--)) ppiippee lleennggtthh ((mm))

Straight coupler 16 mm 2.4 0.6

Straight coupler 20 mm 2.0 0.7

Straight coupler 25 mm 1.1 0.5

Elbow 90° 16 mm 3.7 1.0

Elbow 90° 20 mm 2.9 1.0

Elbow 90° 25 mm 2.6 1.2

Transition 16 x ½ male/female 2.4 0.6

Transition 20 x ½ male/female 2.0 0.7

Transition 20 x ¾ male/female 2.0 0.7

Transition 25 x ¾ male/female 1.1 0.5

Transition 25 x 1 male 1.1 0.5

Tee 16/16/16 straight flow 2.4 0.6

Tee 16/16/16 flow to branch 3.7 1.0

Tee 20/20/20 straight flow 2.0 0.7

Tee 20/20/20 flow to branch 2.9 1.0

Tee 25/25/25 straight flow 1.1 0.5

Tee 25/25/25 flow to branch 2.6 1.2

Tee 20/16/20 straight flow 2.0 0.7

Tee 20/16/20 flow to branch 2.4 0.6

Tee 25/16/25 straight flow 1.1 0.5

Tee 25/16/25 flow to branch 2.4 0.6

Tee 25/20/25 straight flow 1.1 0.5

Tee 25/20/25 flow to branch 2.0 0.7

Wavin Tigris Gas manual

Design

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7

Check pressure loss for section A + B

The total pressure loss for pipe section A including fittings is:

Pipe 25: 2.0 m

Fitting 1, 25 x ¾: 0.5 m

Fitting 2, elbow 25: 1.2 m

Fitting 3, tee 25x16x25 (straight): 0.5 m

Total: 4.2 m x 0.15 mbar/m = 0.63 mbar

The total pressure loss for pipe section B including fittings is:

Pipe 25: 8.0 m

Fitting 4, elbow 25: 1.2 m

Fitting 5, 25 x ¾: 0.5 m

Total: 9.7 m x 0.09 mbar/m = 0.87 mbar

Total pressure loss for pipe section A + B = 0.63 + 0.87 = 1.5 mbar.

For pipe section C, we look at 10 kW in Figure 7. Pipe 16

has a pressure loss of 0.10 mbar/m and therefore seems suitable.

Check pressure loss for section A + C

The total pressure loss for route C including fittings is:

Pipe 16: 6.0 m

Fitting 3, T 25x16x25 (branch): 0.6 m

Fitting 6, 16 x ½: 0.6 m

Total: 7.2 m x 0.10 mbar/m = 0.72 mbar

Pipe section A has a pressure loss of 0.63 mbar (see above),

making the total pressure loss for A + C 0.72 + 0.63 = 1.35 mbar

2.6. General rules on noise

Noise nuisance in gas pipes primarily

occurs in fittings. It is therefore

preferable to install as few fittings as

possible in the vicinity of areas that are

in use.

The pipe diameter must be chosen so

that the flow rate in or near occupied

rooms is not faster than 15 m/s at any

point. To limit loss of pressure, the flow

rate will never exceed 5 m/s in most

cases, so that noise nuisance is never a

problem in reality.

Gas

Wavin Tigris Gas manual

Installing the Wavin PE-X/AI pipe system

8 TEL.+31 (0)523-624 911

FAX+31 (0)523-624 600

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3. Installing the Wavin PE-X/Al pipe system

The use of metal fittings and the inner

aluminium layer of the pipe ensure that

gas will not escape easily in the event

of a fire. The pipe must, of course,

be protected against extremely high

temperatures, so pipes must not be laid

above heating appliances or close to

electrical devices that can generate

heat.

3.1. Expansion and fixing

All pipe materials expand when heated

and contract when cooled. For gas

pipes, the expected differences in

temperature are limited (15° - 30°C).

Greater temperature differences will

only need to be taken into account

when pipes are installed under

extremely high or low ambient

temperatures. The linear expansion

coefficient of Wavin PE-X/Al pipes is

0.025-0.030 mm/mK (irrespective of the

pipe diameter).

Figure 6 can be used to calculate the

expected elongations for Wavin PE-X/Al

pipes in practice with a temperature

reduction of 5°C (e.g. from 20 to 15°C)

and a temperature increase of 10°C.

The change in length can also be

calculated using the following formula:

ΔI = α x L x ΔT

ΔI = change in length (mm)

α = linear expansion coefficient (mm/mK)

L = pipe length (m)

T = difference in temperature (K)

When pipes are anchored, one fixed point

is fastened to each straight pipe, usually

in the middle. The fixed points are

attached to the pipe, not right next to

a fitting. The other brackets must be

sliding brackets so that the pipe can

move freely when expanding and

contracting. When the pipe changes

direction, there must be sufficient room

behind the bends or tees to

accommodate the movement in length

of the straight pipe.

Temperature difference [K]

Pip

e le

ngth

[m]

Leng

th c

hang

e [m

m]

0 20 40 60 80

23222120191817161514131211109876543210

10

9

8

7

6

5

4

3

2

1

Fig. 10. Change in length of Wavin PE-X/Al pipes (based on _ = 0.025 mm/mK

FP = Fixed point

GL = Slider point

Fig. 11. Fixed point and slider brackets.

Wavin Tigris Gas manual

Installing the Wavin PE-X/AI pipe system

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9Gas

Fig. 12. Bracket distance for

Wavin PE-X/Al pipes: 60.D

Expansion bends can be used for very

long straight pipes or fixed end points.

It is generally more than adequate to

choose a length for the bent sections of

an expansion bend that is equal to the

bracket distance (see Figures 11 and 12).

Checks must be carried out for very large

distances and considerable differences in

temperature, (see Section 3.2).

Pipe size Pipe weight Bracket distance

mm kg/m m

16 0.095 0.9

20 0.138 1.2

25 0.220 1.5

The wall on which the brackets are

secured must be sturdy enough to

support the pipe, taking into

consideration any extra load resulting

from jolts etc. A shorter bracket

distance can be used if necessary or,

if the base is weak, a rail or plank can

be fitted to which the brackets can be

secured. See Figure 12 for the weights

required.

Heavy accessories, gas appliances etc.

must not be hung from the gas pipe.

In concrete floors and walls, the

expansion forces can be absorbed by

the surrounding concrete. The forces

that occur are so low that no changes

in length occur. The pipe must be

protected where it exits the concrete.

This is usually done by fitting an

oversized pipe sleeve and allowing it to

protrude from the wall by at least

20 mm (see Figure 5).

With floors, the top of the gas pipe

must lie at least 35 mm under the

finishing layer to prevent damage from

nails or screws.

In principle, the pipes can be placed in

concrete without a casing, but care

must be taken to ensure that the pipes

are not damaged when the concrete is

poured in. Changes in length must be

taken into account if a pipe sleeve is

then used in this case. With changes in

direction, insulation must be used so

that it can absorb the expansion

(insulation thickness = 1.5 x expected

expansion).

When pipes are installed in plastered

walls (e.g. in slotted grooves), the

plaster work is usually not strong

enough to absorb the expansion forces.

The pipes must then be inserted in a

pipe sleeve and sufficient space must

be left where they change direction to

accommodate the expansion.

Fig. 13. Bending Wavin PE-X/Al pipes with and without a pipe bending spring

3.2. Bending of Wavin PE-X/Al pipes

As the pipes are easy to bend by hand,

only a few fittings will usually be

required. Pipes can be bent with or

without a pipe bending spring

(see Figure 13).

Buckled pieces of pipe must be

removed as they may impede the flow

of gas in the pipe.

If a pipe bending spring is used, the

bending radius can be decreased

(see Figure 14).

Fig. 14. Minimum bending radius of

Wavin PE-X/Al pipes

Pipe size Bending Bending by hand radius pipe radius

bending springmm mm mm

16 x 2.0 5 x Da ≈ 80 4 x Da ≈ 64

20 x 2.25 5 x Da ≈ 100 4 x Da ≈ 80

25 x 2.5 5 x Da ≈ 125 4 x Da ≈ 100

Wavin Tigris Gas manual

Installing the Wavin PE-X/AI pipe system

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If an expansion bend is used in a pipe

route, a certain length of bent section

must be kept, depending on the

expected expansion. This expansion

depends on the length of pipe and the

expected temperature change (see

Section 3.1). Once the expansion has

been determined, Figure 15 can be

used to determine the minimum length

of the bent section.

3.3. Making connections

Pipes are difficult to clean once they

have been installed, therefore try to

prevent the inside of the pipe becoming

dirty.

Make a square cut in the pipe using

tongs or a pipe cutter.

Re-round the pipe by using the

Wavin calibration tool. This removes

burrs and bevels the pipe. Insert the

calibration tool using a rotating

motion until the stop. Make at least

one complete rotation with the

calibration tool and then remove it

using a rotating motion. Check the

length of the internal bevel:

at least 1 mm for 16–25 mm pipe.

Apply a little lubricant if necessary

to the internal bevel of the pipe end.

Insert the pipe into the fitting until

the stop and check the insert length

through the window in the ferrule.

Lay the jaw of the pressing tongs

against the stop on the fitting and

carry out the pressing. The fitting

procedure is complete when the jaw

is fully closed.

The gas pipe must not be rotated in

the fitting after pressing.

3.4. Pressing tool

The Wavin pressing tool must be used

for pressing work. A limited number of

other brands of pressing tools and/or

pressing jaws can also be used; please

consult your Wavin representative.

The pressing jaws must be kept clean

and undamaged.

The pressing jaws must also be

inspected annually to ensure they can

still be used to make good connections.

This applies to pressing jaws for manual

pressing tools and for hydraulic tools.

Electrical pressing tools must also be

inspected annually to check their

electrical safety and effective operation.

Both inspections can be performed by:

HK Electric

PO Box 71

5320 AB Hedel, The Netherlands

Tel. +31 (0)73 - 599 7 599

Fax. +31 (0)73 - 599 7 590

Email: [email protected]

3.5. Threaded connections

Wavin Tigris threaded fittings are

threaded with gas pipe thread in

accordance with ISO 7/1; the female

thread is parallel and the male thread

is conical.

All Wavin Tigris threaded fittings are

cleaned at the factory. In principle,

threading oil eliminates the need to

clean the fitting. This is why it is

advisable to keep the fitting in its

packaging for as long as possible.

The threaded fitting will need to be

cleaned if it has come into contact with

oil or grease.

The Wavin Tigris fittings with an outside

thread are serrated to make it easier to

attach sealing tape.

16 x 2,0020 x 2,2525 x 2,50

1600

1400

1200

1000

800

600

400

200

00 5 10 15 20 25 30 35 40 45 50

Fig. 15. Determination of the length of the bent section for Wavin PE-X/Al pipe

Length change [mm]

Pip

e si

ze [m

m]

Ben

t se

ctio

n [m

m]

Wavin Tigris Gas manual

Installing the Wavin PE-X/AI pipe system

TEL.www.wavinoverseas.com

11Gas

Fitting a threaded fitting:

Apply plenty of Teflon tape to the

outside thread and screw both

threaded fittings together by hand.

After tightening the connection

manually, use an open-ended

spanner to tighten the connection

a further two turns at most.

Do not turn the fittings back as this

could cause leakage.

Make the connection to the Wavin

Tigris pipe as described above.

Do not rotate the Wavin Tigris gas

pipe after pressing.

A liquid gasket can be used instead of

Teflon tape. The gasket material must

always comply with approval

specification no. 31. A gasket with the

GASTEC QA label satisfies this approval

specification.

3.6. Protecting againstexternal influences

Gas pipes in general, and therefore also

Wavin Tigris gas pipes, must not be

exposed to direct sunlight or other

sources of heat.

High concentrations of ozone can affect

the rubber seals of the press fittings.

Wavin Tigris gas pipes must therefore

not be laid near appliances that can

emit a considerable amount of ozone;

particularly appliances with electrical

discharges such as some types of

electric motors and fluorescent tubes.

As Wavin Tigris gas pipes are mainly

made of plastic, they are highly

resistant to a large number of chemical

substances. If it is likely that specific

chemical substances could come into

contact with the Wavin Tigris gas pipe,

we advise you to contact Wavin to

check the chemical resistance to the

substance in question. Horizontal pipes

must run at least 50 mm above a floor

to reduce the risk of damage.

Wavin Tigris gas pipes are resistant to

condensed water that could fall on the

pipe. The fittings must be protected

from condensation.

3.7. Pressure testing

Each gas pipe must be submitted to a

pressure test after installation. Pressure

testing is done in two steps:

1. A strength test with an air pressure of

5 bar for 10 seconds. The main

purpose of this test is to ensure that

connections do not come apart,

for example because they have not

been pressed.

A plastic pipe with connections can

creep during the pressure test.

This means that during and after an

increase in pressure to the pipes,

the pipe will expand leading to a

drop in pressure even though there

is no leak.

Always take the required precautions

with a view to safety. The stored

energy with large pipe sections can

be high enough that an improperly

secured cap or fitting can shoot

loose at high speed.

2. A sealing test at low pressure.

The purpose of this test is to

determine whether the connections

are completely gas tight. Some

connections can be gas tight at high

pressure but leak at a low pressure.

At high pressure, the O-ring is

compressed so strongly that it may

seal minor damage to the pipe

surface (scratches). At low pressure,

the pressure on the O-ring is less

which means that any damage is not

sealed. Gas tightness at 5 bar is

therefore no guarantee of gas

tightness at operating pressure.

The sealing test is performed with air

or nitrogen for at least 3 minutes at

a test pressure of 125 mbar (nominal

operating pressure + 100 mbar).

No drop in pressure is permitted

during this test. A change in ambient

temperature and barometric pressure

can influence the manometer

reading. These two quantities must

therefore be constant during the test.

The connections must be visible during

the sealing test.

After fitting the appliances, the

complete gas installation as a whole

must be tested to ensure it is leak proof

with natural gas at operating pressure.

After closing the main valve, the

pressure must not drop by more

than 1 mbar during the test time of

3 minutes.

Wavin Tigris Gas manual

Technical data / Branches

GasTEL.www.wavinoverseas.com

12

4. Technical data / Branches

Pipe composition Inner pipe: cross-linked PE (PE-Xc)

Outer pipe: cross-linked PE (PE-Xb)

Intermediate layer: aluminium pipe without

overlap

All layers bonded with a special adhesive

Pipe colour Yellow

Fittings Brass

Colour of threaded fittings Brass/yellow

O-ring material NBR

Maximum temperature 95°C

Linear thermal expansion coefficient

of the pipe 0.025–0.030 mm/mK

Resistance of the pipe to heat conduction 0.4 W/mK

Pipe roughness 0.007 mm

4.1. Technical data for the Wavin PE-X/Al gas pipe system

© 2009 Wavin Netherlands B.V.

The information presented in this manual is based on our current knowledgeand experience. Nevertheless, we accept no liability for the consequencesof any errors or omissions contained herein. Sections of the contents mustonly be copied if the source is acknowledged.

Wavin Tigris Gas Manual

www.wavinoverseas.com

0509

09-0

9740

2986

6

WWaavviinn OOvveerrsseeaassRollepaal 197701 BR DedemsvaartPO Box 1587700 AD Dedemsvaart, The NetherlandsTelephone +31 (0)523-624 911Fax +31 (0)523-2624 600Internet www.wavinoverseas.comE-mail [email protected]

Product range:Wavin supplies plastic pipe systems with a complete range of fittings for the following areas of application:

Drinking water distributionGas transport and distributionPressure sewerage systems including pump sumpsExternal sewers including plastic inspection chambers, plastic gulliesDomestic soil and waste systemsSanitary and heating systemsRainwater drainage and roof gutteringRainwater systemsRainwater infiltration unitsPE drainageElectrical systemsCable ductingIndustrial pipesGlass fibre reinforced plastic pipesDrainageLinear drainage systems