corrosion & scale inhibitors

Water is used widely as a cooling medium in processes for many industries and public buildings. The use of an evaporative cooling tower is still the most effective method of heat transfer. Heat is transferred from hot process fluids into the cooling water through a heat exchange surface; consequently, the cooling water heats up. The evaporation of a small percentage of this cooling water in a cooling tower, then reduces the temperature of the cooling water, allowing it to be used for cooling again. Make-up water is used to replace the evaporated water.

Evaporative condensers are often used to cool closed systems whereby pipework containing hot process fluids is sprayed with water to remove heat from the system. The primary objectives in the design, operation and effective treatment of cooling water systems include efficiency in heat transfer, minimisation of energy and water usage, and safe, reliable operation.

When operating a cooling system, there are several considerations to ensure the achievement of these objectives, which include the control of scale, corrosion, fouling, and the control of microbiological contamination including Legionella spp.

OUR RANGE OF COOLING TOWER WATER TREATMENT CHEMICALS

We have a full range of cooling tower water treatment chemicals. This range also contains many specialist products formulated for use in specific specialist situations or for use in response to problematic situations. Our Technical department is always available for advice on product selection, problem solving, and compatibility with other formulations already being used in certain systems. 

Scale and Corrosion Inhibitors

Product codeCompositionComments
ST46A blend of phosphonates, polymers and azolesConcentrated all organic corrosion and scale inhibitor for soft waters. Suitable for water hardness 25 – 250ppm
ST47A blend of phosphonates, polymers and azolesAll organic corrosion and scale inhibitor for soft waters and smaller systems. Suitable for water hardness 25 – 250ppm
ST664A blend of phosphonates, polymers and azolesAll organic corrosion inhibitor for medium hardness waters.
ST640A blend of phosphonates, polymers and azoles.High strength all organic corrosion inhibitor for high hardness waters.
ST48A blend of phosphonates, polymers and azoles.Medium strength all organic corrosion inhibitor for high hardness waters.
ST49A blend of phosphonates, polymers and azoles.Low strength all organic corrosion inhibitor for high hardness waters.
ST45A blend of phosphonates, polymers and azoles & sodium bromideAll organic corrosion inhibitor for naturally soft waters. Contains sodium bromide for cost effective generation of hypobromous acid when dosed with sodium hypochlorite.
ST50Silicate based soft water inhibitorConcentrated low toxicity silicate based corrosion inhibitor for naturally soft and softened water.
ST51Silicate based soft water inhibitorLow toxicity silicate based corrosion inhibitor for naturally soft and softened water. Suitable for use in smaller systems.
ST52Sodium molybdate based soft water inhibitorConcentrated high molybdate based corrosion inhibitor designed for soft water. Benefits from some hardness being present.
ST53Sodium molybdate based soft water inhibitorA high molybdate based corrosion inhibitor designed for soft water. Benefits from some hardness being present. Designed for smaller systems.
ST1260Sodium molybdate based soft water inhibitorCost effective molybdate based soft water inhibitor. Benefits from some hardness being present
ST540A blend of phosphonates, phosphates, polymers and azoles.A phosphate based product specifically designed for the passivation of Galvanised towers.
ST250Supplementary product to control phosphates where there are high levels of phosphates in make-up water.A blend of polymeric dispersants.
ST197Zinc based corrosion and scale inhibitorA zinc based corrosion inhibitor for cooling towers.
ST472An acidic zinc based aqueous solution.A specialist scale and corrosion inhibitor for use in cooling systems, can processing, pasteurisation, and sterilisers.

Scale and Corrosion Inhibitors (+ Sodium Bromide)

Often, cooling tower biocidal treatment is accomplished with bromine based oxidizing biocides generated from dosing sodium bromide solution in conjunction with sodium hypochlorite. On some sites it is more convenient and economical to dose a scale and corrosion inhibitor containing sodium bromide in conjunction with sodium hpochlorite in order to generate hypobromous acid for microbial control.  

Product code
Composition
Comments
ST456
A blend of phosphonates, polymers and azoles & sodium bromide
All organic corrosion inhibitor for medium hardness waters. Contains sodium bromide for cost effective generation of hypobromous acid when dosed with sodium hypochlorite.
ST457
A blend of phosphonates, polymers and azoles & sodium bromide
All organic corrosion inhibitor for high hardness waters. Contains sodium bromide for cost effective generation of hypobromous acid when dosed with sodium hypochlorite.
ST785
Silicate based soft water inhibitor & sodium bromide
Concentrated low toxicity silicate based corrosion inhibitor for naturally soft and softened water. Contains sodium bromide for cost effective generation of hypobromous acid when dosed with sodium hypochlorite.
ST974
Zinc based corrosion and scale inhibitor & sodium bromide
A zinc based corrosion inhibitor for cooling towers. Contains sodium bromide for cost effective generation of hypobromous acid when dosed with sodium hypochlorite.


Scale and Corrosion Inhibitors (+ Biodispersant)

Biofilm build up within a system will greatly inhibit the heat transfer efficiency of the system as well as blocking pipework. A build-up of biofilm within a system will also encourage the growth of Legionella bacteria and may promote the formation of under deposit corrosion. Biodispersants can be incorporated in the treatment regime for cooling towers in a number of ways including within the formulations of some of our range of scale and corrosion inhibitors.

Product code
Composition
Comments
ST1437
A blend of phosphonates, polymers and azoles & biodispersant
All organic corrosion inhibitor for low hardness waters. Contains biodispersant.
ST1436
A blend of phosphonates, polymers and azoles & biodispersant
All organic corrosion inhibitor for high hardness waters. Contains biodispersant
ST1435
Silicate based soft water inhibitor & biodispersant
Concentrated low toxicity silicate based corrosion inhibitor for naturally soft and softened water. Contains biodispersant
ST1438
Sodium molybdate based soft water inhibitor & biodispersant
Cost effective molybdate based soft water inhibitor. Benefits from some hardness being present. Contains biodispersant


SciChem Range

As well as the scale and corrosion inhibitors listed above, we also have our SciChem range; a range of extremely concentrated, economical in-use corrosion and scale inhibitors used in larger industrial systems. Please contact our technical department for further details on this range


Specialist on-line descaler for cooling towers

Product code
Composition
Comments
ST846
Contains a unique polyphosphonate.
A very effective calcium carbonate and calcium sulphate scale inhibitor which also effectively removes calcium carbonate scale on-line during normal cooling tower operation.

 

Acid descalers

Product code
Composition
Comments
ST78
28% Hydrochloric acid.
For acid descaling.
ST1535
Hydrochloric acid 32% + corrosion inhibitor
A highly active acid cleaner and descaler. Also includes a corrosion inhibitor to protect bare metal surfaces particularly carbon steel. Removes both calcium and iron deposits.
ST13
Aliphatic amine based corrosion inhibitor
Confers corrosion inhibition during descaling with Hydrochloric acid
ST42
Sulphamic acid crystals
Mild acid descaler. Crystals. Dissolve in water to produce a 5 – 10% solution.
ST43
Sulphamic acid crystals + amine based corrosion inhibitor.
A highly active combination of acid cleaner and descaler with corrosion inhibitor to protect carbon steel, copper and brass against acid attacks. It can be used on a wide variety of metals including stainless steel. Dissolve crystals in water to produce a 5 – 10% solution then add inhibitor as instructed on product data sheet.
ST231
Sulphamic acid solution
Ready to use Sulphamic acid descaler.
ST1427
Formic acid
Less corrosive than hydrochloric acid. Recommended for stainless steel.
ST532
Formic acid + corrosion inhibitor
Less corrosive than hydrochloric acid. Recommended for stainless steel. Corrosion inhibitor included.
St8
Mineral oil based antifoam
Gives foam control during descaling operations.

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