ABOUT US:

SCALE-BAN EQUIPMENTS PVT. LTD. was established in the year 1996 with its office and

manufacturing setup at Indore, with a vision to providing a non-chemical online solution for the

hard water scaling related problems in heat transfer areas.

Today the company has established itself well in the market and is known for its commitment,

product performance, customer relations, after-sales-service and customised product design for

specific applications.

The manufacturing plant situated at Indore is about 10 km from the city centre and has capacity

to manufacture the product in required sizes and numbers. The production planning is done as

per order position and committed delivery dates to ensure timely delivery as per individual

purchase order.

We manufacture non-chemical water treatment equipment by the name of SCALE-BAN™, which

prevents deposition of hard water scale in the heat transfer area. It can also be installed in the

existing pipe line with absolutely no changes in the piping route and layout.

This On-line equipment does not require any energy input for its operation. It also does not

require any regeneration or maintenance, resulting in zero equipment down time and zero

equipment deterioration.

Our product has been already tested with circulating water having Hardness of 10000 ppm and

TDS count of 40000 ppm. With its ability to successfully operate and perform even at such

extreme parameters, SCALE-BAN™ can save precious water for industries with operation of

cooling tower at higher COC’s. Also due to its unique design, it can work even with RAW WATER

(as makeup water for cooling tower) without its pre-treatment such as softening or addition of

anti scale chemicals.

In addition to excellent water savings, it also offers total prevention of hard water scales in

heat exchangers found in different types of industry.

Having been in market for over a decade, we have developed a vast data base of satisfied clients,

which have been benefitted by achieving substantial operational savings with our proven

technology.

We are awaiting a Patent Number from Office of Controller General of Patents, Designs and

Trademarks (Intellectual Property India), Mumbai, Government of India, pending our application

number 2335/MUM/2009 dated 7th October 2009.

WATER AND ITS PROPERTIES:

Water is nature’s most wonderful, most abundant, and most useful substance. It is estimated

that two-thirds of earth’s surface constitutes of water. It also occupies a unique position in

industries. It plays a very important role as a coolant for steam condensation in thermal power

generation; it is also used as a coolant in process plants. Water is very complex in nature and it

contains a lot of impurities in dissolved and suspended form. Calcium and Magnesium salts

present in water determine the hardness of water and it is this hardness of water, which is the

main cause for HARD WATER SCALE formation in heat exchangers in various industries.

INSULATING PROPERTIES OF HARD WATER SCALE:

Scale formation is a common phenomenon in any industry using water as a coolant OR for steam

generation.

Hard water scale has higher thermal insulating properties, thus resulting in poor heat transfer

efficiencies (see graph below).

Apart from causing this drop in thermal efficiency, it also causes overheating of heat exchange

equipment and results in frequent breakdowns because of equipments chocking. The cleaning

process is recurring and tedious and it also greatly reduces the life of various heat exchangers.

HOW DOES SCALE-BANTM

PREVENT SCALING IN YOUR EQUIPMENT?

THE GALVANIC PRINCIPLE:

The working principle of SCALE-BAN™ is very simple and proven. It incorporates use of the

Galvanic Principle, Chemical Characteristics of water and Fluid Dynamics. SCALE-BAN™ exploits

solubility characteristics of Calcium and Magnesium salts in water with change in its pH value.

SCALE-BAN™ locally increases the pH value of water before it reaches high temperature zone

and then precipitates out hardness causing salts as water flows through SCALE-BAN™.

CHEMICAL CHARACTERISTICS OF WATER:

Effect of rise in temperature of water on solubility of Calcium and Magnesium salts:

As is known, the main cause responsible for formation of scales inside any equipment is the rise

in temperature of water flowing through it, since at higher temperatures, water has a tendency

to precipitate dissolved Calcium and Magnesium salts. A graphic representation of solubility of

these salts in water vis-á-vis its temperature indicates that with the rise in temperature of water

from T1 to T2 the solubility of these salts reduces from S1 to S2.

Thus with higher temperatures of water - as it comes in contact with any heat exchange surface -

Calcium and Magnesium salts precipitate out and form scale on the surface of heat transfer area.

SCALE-BAN™ precipitates out these salts much before the water attains this critical temperature

due to its coming in contact with the heat exchange surface.

Effect of increase in the pH value of water on solubility of Calcium and Magnesium salts:

Similar to its tendency to precipitate out dissolved Calcium and Magnesium salts at higher

temperature, water also tends to precipitate out dissolved Calcium and Magnesium salts at its

higher pH value i.e. when it tends to be slightly alkaline. A graph plotted to illustrate solubility of

Calcium and Magnesium in water vis-á-vis its pH value indicates that with the rise in pH value of

water from P1 to P2 the solubility of these salts reduces from S1 to S2 causing their precipitation at

higher pH values.

SCALE-BAN™ makes use of above principle by locally enhancing the pH value of circulating water

to precipitate these salts before the circulating cooling water actually comes in contact with heat

exchange surface. Consequently, once the precipitation of these hardness causing salts has taken

place, further precipitation due to temperature variation is not possible.

These precipitated salts are in the colloidal form (small particles dispersed in another substance)

and are suspended in water, therefore, because of their very small size (Ø ≈ 0.01µ ~ 0.5µ) and

lighter weight the turbulent water flowing through SCALE-BAN™ carries away these precipitated

salts. THE NET RESULT IS A TOTALLY SCALE FREE SYSTEM.

HOW DOES SCALE-BANTM

EXPLOIT THESE PRINCIPLES AND CHEMICAL

CHARACTERISTICS OF WATER?

THE FUNCTIONING OF SCALE-BANTM

:

As cooling water passes through SCALE-BAN™, and as the circulating cooling water itself acts as

an electrolyte within the equipment, the whole core placed inside the equipment gets negatively

charged. This negatively charged core attracts H+ ions from water, which are the lightest ions.

The relationship between pH of water and H+ ion is expressed by the formula pH α 1/H+

Thus, with the concentration of H+ ion becoming less and less in the circulating cooling water, pH

value of water increases, thereby precipitating Calcium and Magnesium salts; that are

responsible for forming hard water scale on the heat exchange surface within any equipment.

A doubt could arise in the mind regarding formation of scales within SCALE-BANTM

itself due to

adsorption (the adhesion of a thin layer of molecules of some substance to the surface of a solid

or liquid) and that the equipment itself might get chocked after sometime. However, this is not

the case since the geometry of the core is trapezoidal, which creates substantial turbulence in

the water. This turbulence of the water flowing past the SCALE-BANTM

physically cleans the

surface of the core as well as causes pressure variation resulting in low pressure zones being

created downstream of SCALE-BANTM. As the precipitated colloids of are very small in size and

extremely light in weight, the turbulent flow of water carries these away towards low pressure

zone downstream of SCALE-BANTM and the equipment itself remains completely clean forever.

As with any other equipment, SCALE-BANTM

too has its optimal operating range, within which it

performs best. Ideally, the pH value of water should not exceed 8.3 in recirculation and the

minimum flow rate as is applicable for various pipe sizes should be strictly maintained. Minimum

and maximum flow rates corresponding to various pipe sizes are indicated later for ready

reference.

SCALE-BANTM

AND IMPROVEMENT IN POWER GENERATED IN THERMAL POWER

PLANTS DUE ZERO SCALING IN CONDENSER AND BETTER WATER MANAGEMENT

At present 54.09% or 93918.38 MW (Data Source CEA, as on 31/03/2011) of total electricity

production in India is from Coal Based Thermal Power Station.

Advantages of coal based thermal Power Plant:

• They can respond to rapidly changing loads without difficulty

• A portion of the steam generated can be used as a process steam in different industries

• Steam engines and turbines can work under 25 % of overload continuously

Disadvantages of coal based thermal Power Plant:

• A large quantity of water is required

• Operating costs are high

• Unavailability of good quality coal

• Most of the heat energy is lost

Notwithstanding their disadvantages, thermal power plants continue to remain a major source of

electricity supply in India and their population is still increasing. The conventional method of

power generation and supply to the customer is wasteful in the sense that only about a third of

the primary energy fed into the power plant is actually made available to the user in the form of

electricity. In conventional power plant, efficiency is only 35% and remaining 65% of energy is

lost. The major source of loss in the conversion process is the heat rejected to the surrounding

water or air due to the inherent constraints of the different thermodynamic cycles employed in

power generation.

Losses suffered in operating a thermal power plant and typical parameters corresponding to

operation of a 1000 MW thermal power station are indicated in the figures below:

TYPICAL SCHEMATIC OF A THERMAL POWER PLANT WITH EXTRACTION TYPE

SURFACE CONDENSING TURBINE

Operational Efficiency (Plant load Factor):

Operational efficiency is the ratio of the total electricity produced by a plant during a fixed period

of time compared to the total electricity that could have been produced if the plant had

operated at 100 percent capacity in that period.

Operational efficiency ► η(o) is expressed as:

η(o) = (100) E / E100%

where,

η(o) = Operational Efficiency (%)

E = Energy output from the power plant in a particular period (kWh)

E100% = Energy output from the power plant operated at 100% installed capacity in that period

(kWh)

Status of plant load factors in various sectors over a period of last five years:

The PLF in the country during 2007-08 to 2011-12 is as under:

Year Target Actual Sector-wise Actual

(%) (%) Central State Private

2007-08 77.1 78.6 86.7 71.9 90.8

2008-09 79.17 77.19 84.30 71.17 91.01

2009-10 77.20 77.50 85.49 70.90 85.68

2010-11 72.1 75.1 85.1 66.7 85.6

2011-12 68.69 73.32 82.12 68.0 76.19

Though it appears from above data that the actual production has exceeded the target

production, the overall situation indicates that there remains a tremendous scope for

improvement in plant load factor; particularly in the private sector.

In 1884, Charles Parsons developed the first practical, modern, high-speed steam turbine which

overcame many short comings of earlier trails.

There are two basic types of turbines, namely REACTION and IMPULSE. Turbines can be further

classified as:

• The back pressure turbine:

The back pressure turbine discharges the steam into a pressurized piping system to be

used for process heating elsewhere or as the supply to other turbines. For instance a

turbine may receive steam at "(X)" Kg./cm2 and discharge into a "(X – α)" Kg./cm2 system.

• The atmospheric turbine:

The atmospheric turbine is obvious. Here the usually short discharge piping is used just to

get the steam out of the building or to direct it away safely.

• The condensing turbine:

The discharge of a condensing turbine connects to a surface condenser to extend the

range of pressure drop through the turbine to extract more power. The discharge

pressure is actually a vacuum.

Of the three types above, steam surface condensers are the most commonly used condensers in

modern power plants. The exhaust steam from the turbine flows on the shell side (under

vacuum) of the condenser, while the plant’s circulating water flows in the Tube side. The

condensed steam from the turbine, called condensate, is collected in the bottom of the

condenser, which is called a hot well. The condensate is then pumped back to the steam

generator to repeat the cycle.

The main heat transfer mechanisms in a surface condenser are the condensing of saturated

steam on the outside of the tubes and the heating of the circulating water inside the tubes. Thus

for a given circulating water flow rate, the water inlet temperature to the condenser determines

the operating pressure of the condenser. As this temperature is decreased (due to cleaner heat

transfer areas and proper heat exchange), the condenser pressure will also decrease. This

decrease in the pressure (proper maintenance of vacuum) will increase the plant output and

efficiency.

Due to the fact that a surface condenser operates under vacuum, with better vacuum, more

steam will migrate towards the condenser and increase the turbine efficiency due to reduced

back pressure.

On the other hand, the partly condensed steam (due to poor vacuum) will increase the operating

pressure of the condenser. Since the total pressure of the condenser will be the sum of partial

pressures of the steam and the gases, as more and more partly condensed steam remains in the

system, the condenser pressure will rise. This rise in pressure will decrease the turbine output

and efficiency. This will also blanket the outer surface of the tubes and will severely decrease the

heat transfer from the steam to the circulating cooling water and again, the pressure in the

condenser will tend to increase.

Effect of exhaust pressure/ vacuum:

Higher exhaust pressure i.e. lower vacuum, increases the steam consumption in the turbine,

keeping all other operating parameters constant. Exhaust pressure lower than the specified will

reduce the steam consumption and improves the turbine efficiency. Similarly exhaust vacuum

lower than the specified, will lower the turbine efficiency and reduces the steam consumption.

Figures below represents the effects of exhaust vacuum on steam consumption and turbine

efficiency respectively, keeping all other factors constant for the condensing type turbine.

These figures also indicate that improvement in exhaust vacuum by 10 mm Hg (Mercury),

reduces the steam consumption in the turbine by about 1.1 % and improvement in turbine

efficiency varies significantly from 0.24 % to 0.4 %.

1. Effect of exhaust vacuum on steam

consumption in condensing type turbine

2. Effect of exhaust vacuum on turbine

efficiency in condensing type turbine

SCALE-BANTM

AND THE CONDENSERS OF CONDENSING TYPE STEAM TURBINES:

SCALE-BAN

TM can be very gainfully installed in thermal power plants operating on extraction type

surface condensation (Extraction Condensing Steam Turbine) as well as in combined cycle power

plants employing Extraction Condensing Steam Turbine.

Typically, a 1000 MW power plant would require approximately 98000 M3 of water per day,

most of which is wasted resulting in higher operating costs for the plant.

SCALE-BANTM

offers a huge potential by way of:

• Saving this precious water,

• Improving the Plant Load Factor (PLF) due to maintenance of constant condenser vacuum

thus resulting in higher power generation,

• Actually reducing the plant down time required for condenser cleaning.

As one might expect, with millions of litres of circulating (cooling) water flowing through the

condenser tubing from seawater to fresh water, anything that is contained within the water and

flowing through the tubes, can ultimately end up on either on the condenser tube-sheet or

within the tube itself. Tube side fouling for surface condensers is caused mainly due to SCALING,

which are crystalline forms of Calcium and Magnesium salts.

Depending on the extent of this fouling, the impact can be quite severe on the condenser's ability

to condense the exhaust steam coming from the turbine. As fouling builds up within the tubing,

an insulating effect is created and the heat transfer characteristics of the tubes are diminished

requiring the turbine to be slowed to a point where the condenser can handle the exhaust steam

produced. Typically, this can be quite costly to power plants in the form of reduced output,

increased fuel consumption and increased CO2 emissions. This "de-rating" of the turbine to

accommodate the condenser's fouled or blocked tubing is an indication that the plant needs to

clean the tubing in order to return to the turbine's rated capacity.

SCALE-BANTM

INSTALLATION

Installation instructions for SCALE-BAN™:

• Ensure that the Heat Exchanger / Condenser is properly De-Scaled

and thoroughly cleaned before installation of SCALE-BAN™.

• Identify the location for installation of SCALE-BAN™, (which should

be nearest to the Heat Exchanger / Condenser inlet) and there

should not be any valve, strainer or any other appurtenance

upstream of SCALE-BAN™.

• First measure the length of SCALE-BAN™ to be installed.

• Cut the equivalent length of "DISTANCE PIECE" from inlet line at a

point nearest to the heat exchanger. Weld both the flanges

provided with SCALE-BAN™ on both cut ends of the inlet line.

• Properly install SCALE-BAN™ between these two flanges.

• Complete the installation by inserting SCALE-BANTM along with

gaskets and properly tightening all the bolts and nuts supplied

with SCALE-BAN™.

Operating Guidelines for SCALE-BAN™:

• Ensure that the Heat Exchanger / Condenser is properly De-Scaled and thoroughly cleaned

before installation of SCALE-BAN™.

• There should not be any Zero velocity zone or static part between SCALE-BAN™ and heat

Exchanger / Condensers to be protected.

• There should not be any valve or strainer between SCALE-BAN™ and

Heat Exchanger/Condensers.

• Cooling tower sump should be cleaned for any dust/sludge/debris etc. before start of

operation.

• Side Stream filter should be operated daily with open top back wash once in a week.

• pH value of the re-circulating cooling water should be maintained between 7.5 to 8 for

optimal results of SCALE-BAN™.

• pH can be maintained by dosing pH maintaining Chemicals or by dosing of commercial H2SO4.

• The Quantity of Sulphuric Acid (H2SO4) dosing can be finalised on commencement of the

operation as it is dependent on the Sump holding capacity, quality of water, pH of makeup

water, flow rate, evaporation and drift losses etc.

SAVINGS

Savings achieved through installation of SCALE-BAN™:

• Improved Plant Load Factor (PLF).

• Begins a march towards Zero Discharge.

• Improved operating profits due to tremendous savings.

• Maintenance of constant vacuum in turbine condenser.

• No shutdown of plant is required for cleaning of Heat Exchanger / Condensers because of

Zero scaling.

• Excellent Water savings due to reduced blow down with high COC operation of cooling tower.

• Since SCALE-BANTM

is tested to run at high hardness (10000 ppm) and TDS (40000 ppm) in

cooling tower without treatments, so blow down from cooling tower is negligible.

• No water softening plant is required hence recurring expenses related to water softening are

saved.

• De-scaling chemicals are not required to be added in cooling water.

• ETP load is reduced significantly.

• Due to repeated cleaning of the hard scales in tubes with rod, tube surfaces become weak

and prone to leakage, which is avoided due to Zero Scale.

• SCALE-BAN™ is "fit and forget" equipment having a guaranteed maintenance free life of 20

years - consuming no power.

ADVANTAGES

Prevention of Scale:

Due to its unique ability to precipitate dissolved solids in to a colloidal suspension, scale tends to

build up on these seed crystals rather than on the heat transfer areas, thereby preventing the

deposition of scale on the heat transfer areas.

Removal of Existing Scale:

Due to the reduction of the free Calcium and Magnesium from solution by the formation of their

Carbonate crystals and the solubility being constant, water can dissolve more salts, which it

tends to pick up from the existing scale in the system, thereby desalting scaled up systems, under

ideal conditions.

However as the solubility of these is affected by the changes in pH, temperature and pressure,

SCALE-BAN™ will de-scale only under ideal conditions of above parameters. Hence it is not

marketed as a scale remover, but as a scale preventer.

Eliminates recurring costs of expensive chemicals, regenerative salts and resins:

SCALE-BAN™ has no recurring costs as associated with Chemical Dosing or Water Softening, as

no chemicals, regenerative salts or resins are used.

Chemical composition of the water does not change:

SCALE-BAN™ does not change the chemical composition of water, but instead, changes the

physical composition of the scaling salts from a dissolved state to a suspended state, thereby

preventing scale build up.

No risk of corrosion:

Water softeners necessitate the use of corrosion inhibitors, as the water tends to be corrosive.

Similarly, Chemical Dosing reduces the pH of water, thereby increasing the risk of corrosion.

SCALE-BAN™ on the other hand has the unique advantage of preventing scale deposition without

increasing the risk of corrosion.

Eliminates recurring labour costs:

SCALE-BAN™ is a "fit - and – forget" system. It does not require any labour, or supervision for

chemical addition or for regeneration salts as required for chemical dosing and water softener.

Does not require any maintenance:

As SCALE-BAN™ has no moving parts, it requires no replacement of parts or maintenance, other

than normal plant maintenance.

Saves fuel consumption:

Scales reduce heat transfer efficiency resulting in increased energy use which can rise by almost

50%. In Air-conditioning systems, a 5 mm fouling of the condensers can result in an increase of

power costs by over 30%. As the SCALE-BAN™ is installed "on-line", it is constantly preventing

the deposition of scale, thereby saving valuable energy costs as compared to manual desalting

systems, which require desalting to be done periodically.

No Energy Consumption:

Unlike conventional water treatment systems, SCALE-BAN™ does not require any power or

electrical inputs.

No Pollution:

Chemical dosing and water softening systems necessitate the use of chemicals which are

hazardous and cause pollution, and hence have to be treated before water is released into the

underground water table. SCALE-BAN™, on the other hand, does not require use of any such

chemicals.

SCALE-BANTM can handle variable water qualities:

In conventional systems of chemical dosing and water softening, the quantity of various

chemicals has to be adjusted according to the water quality; hence the system has to be closely

monitored for variable water qualities. SCALE-BAN™, on the other hand, is not affected by

variable water qualities and can handle water up to any hardness.

No investment risk:

SCALE-BAN™ is sold with a Twenty Years Performance Guarantee. In view of this, there is no

investment risk on part of the user of the equipment. It also offers a low pay back period,

depending upon the type of industry and present means of water treatment.

Estimated savings after installation of SCALE-BANTM

Plant Data

• Power Plant Capacity in MW. 100

• Flow of Re-Circulating Water M3/Hr. 20000

Status prior to installation of SCALE-BANTM

:

• COC Maintained 4 COC

• Evaporation Losses (Le) @1.5% of circulation rate [A] 300 M3 /hr

• Blow Down from Cooling Tower = {Le / (COC-1)} [B] 100 M3 /hr

• Total consumption per hour = [A]+[B] [C] 400 M3 /hr

• Total water requirement per Day = [C] x 24 as make up to cooling tower [D] 9,600 M3 / Day

• Regeneration Losses in softener per day @10% of feed water to softener [E] 960 M3 / Day

Status Changed after installation of SCALE-BANTM

:

• COC Maintained 20 COC

• Evaporation Losses (Le) @1.5% of circulation rate [A1] 300 M3 /hr

• Blow Down from Cooling Tower = {Le / (COC-1)} [B1] 16 M3 /hr

• Total consumption per hour = [A1]+[B1] [C1] 316 M3 /hr

• Total water requirement per Day = [C1] x 24 as make up to cooling tower [D1] 7,584 M3 / Day

• Total savings of water per day = [D] – [D1] [E1] 2,016 M3 / Day

• Total savings of water per year [E1] x 330 days / year [F1] 6,65,280 M3 / Year

A. TOTAL DIRECT SAVINGS AFTER INSTALLATION OF SCALE-BANTM

1. Saving due to less consumption of water, stoppage of softener operation and non usage of anti-

scaling chemicals:

• Cost of water saved = [F1] x Rs. 15/- per M3 [G] 99,79,200 Rs. Per Year

• Cost of Anti-scaling chemicals saved Lump sum – Assumed [H] 25,00,000 Rs. Per Year

Total Savings per Year (1) = [G] + [H] Rs. 1,24,79,200 Rs. Per Year

2. Savings due to proper HEAT EXCHANGE inside condenser and lesser consumption of High

Pressure steam:

• Profits reduced due to excess consumption of 0.2 Te (being just 5% of

normal consumption) of HP steam per MW generation for an average of

100 days in a year due to scaling in condenser:

Considering normal consumption of 4 Te of HP steam per MW generation;

and assuming the cost of Steam as Rs. 600/- per Te; the total excess

steam consumption per day will be 100MW x 0.05 x 4 Te x 24 hours =

480Te per day

Therefore, Cost of Excess Steam consumed for 100 days shall be = 100 x

480 x 600 = Rs. 2,88,00,000/-P.A.

2,88,00,000 Rs. Per Year

Total Savings per Year (2) Rs. 2,88,00,000 Per Year

B. TOTAL DIRECT SAVINGS = (1) + (2) Rs. 4,12,79,200 Per Year

B. TOTAL INDIRECT SAVINGS AFTER INSTALLATION OF SCALE-BANTM

1. Loss of Profits due to forced plant shutdown of 3 days for De-scaling:

Considering profit to be Rs. 2000/- per MW;

Loss of profits = 2000x100MWx24 hrs.X3 days = 1,44,00,000

Rs. 1,44,00,000 Rs. Per Year

2. Profits reduced due to partial loss of vacuum in condenser because of

scaling in condenser tubes:

Considering less generation of 5 % for 75 days and importing the shortfall

from Grid 0.05x100MWx24x75x2000

Rs. 1,80,00,000 Rs. Per Year

B. TOTAL INDIRECT SAVING (1) + (2) Rs. 3,24,00,000 Rs. Per Year

TOTAL [ (A) DIRECT + (B) INDIRECT ] SAVING = Rs. 7,36,79,200 Rs. Per Year

SELECTION

SCALE-BAN™ is selected on basis of:

[A] Water flow (M3 per hour) rate,

[B] Size of Cooling Water line.

Engineering Data

Notes:

1. Approximate Length of SCALE-BAN™ is one meter.

2. SCALE-BAN™ is supplied in flanged or screwed end connections with matching flanges.

3. The equipment is tailor made as per specific requirements of the application.