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B & V Group

A division of
Global Chemical Technologies Ltd
http://www.bvwater.co.uk/
Boiler Water Chemical Range
Boiler Water Chemical Range

Boiler Water Chemical Range

Severe problems can occur if scale formation and corrosion are allowed to occur in steam-raising plant. These problems can range from loss of efficiency and reduction of plant life to, at worst, catastrophic failure. It is also necessary to prevent boiler water carryover, where boiler water (including its dissolved solids) is carried into the steam, sludge deposition and foaming.

Both external and internal treatment of the boiler water is essential for ensuring optimal operation. External treatment of the make-up water reduces or removes impurities. There are many types of external treatment, including water softening, de-alkalisation, de-aeration, demineralisation and reverse osmosis. The type of external treatment used will depend on the purity of the make-up water required. This, in turn, will be determined by the volumes of feed water required and the boiler design (pressure, heat transfer rate etc.). The water purity is of particular importance in high pressure boilers where virtually all impurities must be removed from the water. 

An effective internal boiler treatment programme involves the addition of chemicals to the feed water, boiler water and steam in order to confer desirable attributes, or to react with traces of undesirable constituents which can remain after external treatment. Typically, oxygen scavengers, dispersants and alkalinity builders are used.  Other products, including condensate line corrosion inhibitors and antifoams may also be used.

 

Oxygen Scavengers

The primary cause of corrosion in boilers is generally dissolved oxygen, particularly in conjunction with low pH (low alkalinity), although excessive alkalinity can also be a factor. The solubility of oxygen in water does decrease as the temperature is increased.  While high feed water temperatures and allowing the oxygen to escape will help in reducing corrosion, chemical oxygen scavengers are used to eliminate the remaining oxygen from the feed water.

The main types of oxygen scavenger are shown below.

Please note all chemicals are also offered as a pump over delivery.

Product
Name

Brief Description

Benefits

BV171

A catalysed liquid sulphite based oxygen scavenger for the treatment of boiler feed water.

  • Rapid removal of dissolved oxygen

  • Will prevent pitting corrosion of heat exchange

  • Can be used in a boiler plant up to a pressure of 46 bar

  • Suitable for use where steam comes into contact with food (FDA)

BV173

A concentrated liquid blend of tannins used for the treatment of boiler feed water.

  • Tannins act as an oxygen scavenger

  • Also forms a protective tannate film on metal surfaces

  • Minimal contribution to boiler TDS

  • Particularly suitable for plant where the feed temperature is low

  • Suitable for use where steam comes into contact with food (FDA)

BV169

A catalysed solution of volatile oxygen scavenger for the treatment of boiler feed water. Particularly suitable for use in high pressure boilers.

  • Low toxicity

  • Protects the complete system from oxygen pitting corrosion

  • Passivates iron and copper surfaces through the formation of protective oxide layers

BV177

A blend of catalysed sulphite, volatile oxygen scavenger  and amines for the treatment of boiler feed water and MPHW systems.

  • Protects the complete system from oxygen pitting corrosion

  • Passivates iron and copper surfaces through the formation of protective oxide layers

  • Reduces carbonic and induced condensate line corrosion

BV681

An organic oxygen scavenger, carbohydrazide based, for the treatment and passivation of steam raising systems. Particularly suitable for use in high pressure boilers.

  • A low toxicity alternative to hydrazine

  • Can be used as a direct replacement for hydrazine

  • Compatible with most internal boiler water treatment programmes

BV166

A liquid, non-volatile, organic oxygen scavenger for the treatment of steam raising systems where steam may come into contact with food.

  • Suitable for use in food, dairy and beverage industries

  • Can be used with either de-ionised or softened water

  • Suitable for use in high pressure boilers

BV449

A liquid non-volatile, organic oxygen scavenger for the treatment of steam boilers where steam may come into contact with food.

  • Passivation of all steel surfaces

  • Lower corrosion rates - reducing maintenance costs and down time

  • Minimal contribution to dissolved solids and ammonia in the boiler water

  • Suitable for use in high pressure boilers

 

Dispersant Sludge Conditioners

Scale results from the formation of insoluble calcium and magnesium salts and is seen as a rock like coating on the inside of boiler tubes. A conditioner is required which will react with any residual hardness present in the incoming feed water and prevent precipitation of scale onto the boiler surface. Phosphate, polymers and chelant treatments are typically used. Sludge conditioners tend to be organic polymers and help to prevent the adherence of suspended solids onto heat transfer surfaces. The polymers combine with precipitates and the resultant electrical charge on the particle surface enables the particles to be dispersed so that they may be removed by blow-down.

Certain of the formulations in the below table can be used to gradually remove scale from the internals of the boiler when continually dosed. This procedure needs to be carefully managed and controlled. For further advice on this application please contact the Own Label Department. 

Product Name

Brief Description

Benefits

BV31

A high stability polymeric water conditioner for the treatment of boiler water.

  • High temperature stability

  • Suitable for use in high pressure boilers

  • Low solids contribution

  • Maintenance of good heat transfer

  • Suitable for use where steam comes into contact with food (FDA)

BV34

A sludge conditioner used in boiler feed water treatment. Used to condition and disperse and residual hardness.

  • Based on a polyacrylate polymer

  • Contains polyphosphate

  • Suitable for use where steam comes into contact with food (FDA)

BV35

A sludge conditioner for the feed water treatment of a steam raising plant.

  • Helps maintain heat transfer efficiency

  • Aids scale removal on-line when used with a good soft water and caustic alkalinity supply

  • Compatible with most boiler water treatments

BV37

A sludge conditioner for the feed water treatment of steam raising plants

  • Helps maintain heat transfer efficiency

  • Will remove scale on-line when used with a good soft water supply and a good caustic alkalinity supply.

  • Suitable for use where steam comes into contact with food (FDA)

BV666

A boiler feed water treatment for the control of scale

  • Suitable for low hardness, softened and de-alkalised feed waters

  • Suitable for boilers operating at pressures up to 40 bar

  • Prevents the formation of adherent deposits

 

Condensate Line Corrosion Inhibitors

Corrosion can also occur in condensate return lines. It is almost always due to oxygen in the steam or carbon dioxide which leads to the production of carbonic acid. Oxygen should ideally have been dealt with by the treatment of the feed water but any remaining can be removed by one of the steam volatile oxygen scavengers shown in the first table above.

Carbon dioxide corrosion can be controlled by pre-treatment techniques or by the addition of steam volatile neutralising and filming amines. Filming amines are generally dosed into the steam lines and form a protective film on the surface of the condensate lines. Neutralising amines enter the condensate lines with the steam and neutralise the carbonic acid, thereby raising the pH. The choice of neutralising amine is influenced by its ability to neutralise carbonic acid and raise the pH as well as its vapour-to-liquid distribution ratio. Morpholine, for example, has a relatively low ratio whereas cyclohexylamine has a much higher ratio.  

The return line treatment products manufactured by B & V Own Label Products have been specially formulated to optimise corrosion protection in return lines of different lengths, in boilers of all pressures and have a product suitable for all industry sectors. Please contact the B & V Own Label Technical department for advice on selection and dosing of return line treatments. A series of extremely concentrated return line formulations are also available for large industry and export customers.

Product Name

Brief Description

Benefits

BV214

A solution of volatile amine used to neutralise the acidic carbon dioxide content of steam condensate

  • Extends the life of condensate pipework by reducing the rate of 'grooving' by acidic condensate

  • Has FDA approval for use where steam comes into contact with food, within set limits

BV219

A solution of 2 volatile amines used to neutralise the acidic carbon dioxide content of steam condensate

  • Extends the life of condensate pipework by reducing the rate of 'grooving' by acidic condensate

  • Has FDA approval for use where steam comes into contact with food, within set limits

BV222

A solution of 2 volatile amines used to neutralise the acidic carbon dioxide content of steam condensate

  • Extends the life of condensate pipework by reducing the rate of 'grooving' by acidic condensate

  • Not FDA approved

BV224

A blend of  3 volatile amines used to neutralise the acidic carbon dioxide content of steam condensate

  • Extends the life of condensate pipework by reducing the rate of 'grooving' by acidic condensate

  • Has FDA approval for use where steam comes into contact with food, within set limits

BV218

An emulsion of filming amine used to protect the condensate lines of steam raising plant

  • Extends the life of condensate pipework by reducing the rate of 'grooving' by acidic condensate and pitting due to oxygen attack

  • Has FDA approval for use where steam comes into contact with food within set limits.

  • Has FDA approval for use where steam sterilises surgical bandages, dressing and instruments within set limits

BV216

A blend of neutralising and filming amines for the protection of steam boiler condensate lines

  • Extends the life of condensate pipework by retarding the rate of 'grooving' by acidic condensate and pitting due to oxygen attack

BV223

A blend of neutralising amines and a volatile oxygen scavenger for the protection of boiler condensate lines

  • Extends the life of condensate pipework by retarding the rate of 'grooving' by acidic condensate

  • Also protects return lines by scavenging dissolved oxygen

  • DEHA has the ability to passivate iron and copper surfaces.

BV467

A low toxicity condensate line corrosion inhibitor

  • Does not 'gunk' or foul like conventional filming amine treatments

  • Ease of handling

  • Excellent corrosion protection

  • FDA approved to 20ppm

 
 

pH Adjusters / Alkalinity Builders

Sodium hydroxide provides a highly alkaline environment in the boiler. This alkaline pH helps to control the corrosion of steel. Maintaining the correct alkalinity range minimizes this highly corrosive effect of water in the high temperature environment of the boiler. Alkalinity also plays a critical part in various chemical reactions in the boiler. Most of boiler water alkalinity comes from the addition of sodium hydroxide in the chemical programme. While, naturally occurring alkalinity found in raw water supplies makes up the rest. If alkalinity is present naturally, it contributes to the required alkalinity in the boiler and decreases the amount of sodium hydroxide needed.

Product

Composition

Comments

BV24

An aqueous solution of

sodium hydroxide.

 

A pH adjuster for steam boilers where there is insufficient alkalinity in the feed water. Complies with FDA regulations for steam that comes into contact with food.

BV23

An aqueous solution of sodium hydroxide.

Concentrated pH adjuster for steam boilers where there is insufficient alkalinity in the feed water. Complies with FDA regulations for steam that comes into contact with food.

 
 
 

Multipurpose Chemicals

Ideally, an oxygen scavenger, sludge dispersant, alkalinity builder and return line treatment should all be dosed separately, to ensure the levels of each product entering the boiler system can be adjusted. This is particularly important to attain the limits for each component stated in BS 2486:1997 “Recommendations for treatment of water for steam boilers and water heaters and the European standards BSEN 12952/53”.

For smaller boilers a multipurpose product is often specified by the customer. The following sulphite and tannin based multi-purpose boiler products are just a small selection of the complete range available from B & V Own Label Products. All products comply with the FDA regulations for steam that comes into contact with food. The below product formulations differ in their composition, in particular in their sulphite, tannin and caustic levels. Please contact the B & V Own Label Products Technical department for further advice and guidance. 

Product Name

Product Size

Benefits

BV150

A multipurpose boiler feed water treatment for the treatment of softened feed waters.

  • Will prevent pitting corrosion of heat exchange surfaces

  • Conditions residual hardness, preventing the deposition of scale

  • Suitable for small packaged steam boiler plant, low and medium hot water systems or steam generators

  • Can be used where steam comes into contact with food

BV149

A multipurpose boiler feed water treatment for the treatment of softened feed waters.

  • Will prevent pitting corrosion of heat exchange surfaces

  • Conditions residual hardness preventing the deposition of scale

  • Can be used where steam comes into contact with food

BV144

A liquid blend of tannin and alkalinity builder for the treatment of feed water to hot water systems, packaged steam boilers and steam generators.

  • Suitable for cold water feed systems where dissolved oxygen levels are high

  • All-in-one treatment

  • Simple test methods

  • Can be used where steam comes into contact with food

 
 

Miscellaneous Boiler Chemicals

Product Name

Brief Description

Benefits

BV1

An antifoam for boiler water

  • Reduces foam tendency and physical entrainment of boiler water in the steam

  • The active component has FDA sanction for addition to steam boilers used to generate steam which will contact food

BV43

A descaling agent with a mixture of filming agent inhibitors which protects bare metal surfaces during descaling operations

  • Effective mild descalant

  • Film formingControls the corrosion of bare metal surfaces

BV81

An inhibited solution of hydrochloric acid suitable for general descaling applications

  • Removes calcium carbonate and iron oxide deposits

  • Contains a corrosion inhibitor to protect bare metal surfaces during cleaning procedures

BV243

An alkaline liquid boil out treatment for the removal of oil and grease, dirt and other organic contaminants from water side boiler surfaces. Can also be used as a closed circuit flushing agent.

  • Ensures a clean system for start-up

  • Contributes to efficient boiler operation

  • All-in-one product

 

 

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Contact Details

Cooper, Jill

Own Label Manager

0844 372 7344

jillcooper@bvwater.co.uk

Newman, Mark

Senior Own Label Technical Consultant

0844 372 7344

marknewman@bvwater.co.uk