It is important to keep systems clean to maintain process efficiencies. In general, this means keeping water treatment systems free from scale but also includes the use of speciality cleaning products including pre-commission cleaners (included with closed circuit products).
Scale can build up on surfaces as dissolved salts (typically of calcium and magnesium) precipitate out of solution. This “reverse solubility” occurs as the water is heated and so scale is a common problem in boilers, heat exchangers and pipework. Dispersant chemicals are used which have two functions, namely to react with any residual hardness present in the incoming feed water and to prevent scale precipitating onto the boiler surface. Phosphate and chelate treatments are typically used. Acid descalers are also appropriate for use for certain applications and metal types.
Sludge conditioners, which are often organic polymers, are used to minimise the adherence of suspended solids onto heat transfer surfaces. The polymers combine with precipitates resulting in the formation of particles that may be removed by blowdown.
The use of cleaning products in plant where there is a build up of, for example, biofilm, corrosion deposits, or general soiling will help to keep plant running smoothly and efficiently. The pre-commission cleaning of hot water heating and chilled systems has become more important over recent years due to the equipment used being more susceptible to blockages at strainers, control valves and small bore heat exchangers.
System contaminants such as mill-scale, jointing compounds and fabricating debris need to be removed by chemical cleaning and high velocity flushing, which will then allow the on-going water treatment regime to work effectively in preventing corrosion and microbiological fouling. Older systems that have accumulated deposits due to lack of the correct water treatment can be cleaned by a similar method.
We would not recommend the use of any of the below acid based solutions when descaling sensitive metals such as as aluminium and any galvanised metals. Please contact our technical department for specialist advice in this regard.
|BV894||Gentle descaler suitable for use in potable water applications||Citric acid||Non toxic acidic formulation suitable for descaling kettles, drinking water hot water boilers and domestic water pipework|
|BV42||Can be used for a variety of descaling operations where calcium carbonate is present as the main scale component||Sulphamic acid granules||Less corrosive than Hydrochloric acid. It is recommended that for most applications BV41 (corrosion inhibitor) is used in conjunction with BV42.|
|BV41 + BV42||Can be used for a variety of descaling operations where calcium carbonate is present as the main scale component||Sulphamic acid granules + corrosion inhibitor||Less corrosive than Hydrochloric acid. Contains a specialist film forming inhibitor which protects bare metal surfaces, including mild steel, stainless steel and yellow metals, during the descaling operation.|
|BV78||A strong acid descaler. Used to remove carbonate scales and iron oxide deposits.||Hydrochloric acid||Suitable for descaling boiler plant and cooling towers. Not recommended for use with stainless steel.|
|BV1535||A strong acid solution. Used to remove carbonate scales and iron oxide deposits.||Hydrochloric acid + corrosion inhibitor||Suitable for descaling boiler plant and cooling towers. Contains a corrosion inhibitor to protect bare metal surfaces during cleaning procedures. Not recommended for use with stainless steel.|
|BV774||An effective and economical means of removing rust, heat treatment scale and welding scale from ferrous components.||An phosphoric acid based product containing detergents and wetting agents||An effective and economical means of removing rust, scale and welding scale from ferrous components. Can also be used to remove the deposits from synthetic paper forming wires|
|BV532||Can be used for a variety of descaling operations where carbonate is present as the main scale component||Formic acid + corrosion inhibitor||Less corrosive than Hydrochloric acid|
|BV661||All in one shower head descaler and sanitiser||A blend of acids and an effective disinfectant||Removes calcium and magnesium carbonate scale. Disinfects - Effective against legionella spp and Pseudomonas aeruginosa|
|BV847||All in one shower head descaler and sanitiser with colour change indicator||A blend of acids and an effective disinfectant||Removes calcium and magnesium carbonate scale. Disinfects - Effective against legionella spp and Pseudomonas aeruginosa. Solution changes colour to indicate when the acid component is depleted beyond the point when effective de-scaling is possible|
|BV1148||All in one descaler and sanitiser with thickener for enhanced adherence to surfaces||A blend of acids and an effective disinfectant||Removes calcium and magnesium carbonate scale. Disinfects - Effective against legionella spp and Pseudomonas aeruginosa. Viscous formulation for use on fixed shower heads, tap fittings and other hard surfaces. Formualted to adhere to surfaces to allow effective descaling and sanitising.|
|BV139||On-line descaler for cooling towers. Non acid formulation||Contains a unique polyphosphonate.||A very effective calcium carbonate and calcium sulphate scale inhibitor and remover for use on-line in open cooling syetems.|
|BV167||Applications include oil removal in cooling towers and biofilm removal in closed systems.||Contains a low foaming amphoteric surfactant.||Compatible With our range of closed circuit and open cooling range of products. Effectively removes biofilm and disperses oil and grease in systems|
|BV243||For the cleaning and pre-treatment of steam boiler plant ‘’alkali boil-out’’||Contains caustic soda, surfactants and dispersants||Ensures a clean system for start-up. Contributes to efficient boiler operation. All-in-one product.|
|BV311||Hard surface cleaning, AHU and duct work cleaning. Cleaning of food contact surfaces and equipment||Non-caustic sanitising detergent||The cleaning and sanitising properties of this formulation can be used in a wide variety of applications. Ideal for use in areas where low levels of soil are present.|
|BV334||Hard surface cleaning, AHU and duct work cleaning. Cleaning of food contact surfaces and equipment||Powerful caustic detergent||Safe to use on most surfaces including PVC, stainless steel and aluminium. Suitable for the removal of difficult greasy soils. Can be used in automated traywash equipment.|
|BV155||Removal of corrosion deposits from heavily corroded open and closed systems||Proprietary formulation of extremely effective corrosion deposit removers.||Will remove tightly adhered corrosion debris. Solubilises and disperses iron oxide particles. Passivates cleaned metal surfaces. Non aggressive to steel, copper, brass and aluminium. High cleaning capacity.|
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HuwaSan specialise in the production and distribution of chemicals for water treatment. B & V Chemicals are water treatment supply partners in the UK.