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Scale Inhibitors & Polymer Sludge Conditioners

Boiler scale control; Scale is caused by the accumulation of hardness salts in the boiler water which, if not removed can cause localised overheating, reduced heat transfer efficiency, and in severe situations tube failure. Hardness salts can either be removed before they enter the boiler system or they can be treated inside the boiler itself with suitable Antiscalent/scale inhibitors.

Even when hardness is removed from the make-up water it is important to use an appropriate scale control programme within the boiler water to ensure that any hardness slippage is prevented from causing troublesome deposits.

To ensure that such boiler systems are well maintained and operate at optimum efficiency it is essential that the correct water conditions are maintained at all times. This can be achieved using carefully selected feed water scale and corrosion inhibitors designed specifically for industrial boilers and steam raising plant.

  • UNICHEM-3220 is a high performance combined polymer phosphate scale inhibitor treatment scientifically formulated for use in steam boiler systems up to 1500 psig.
  • UNICHEM-3220 is used as a scale inhibitor and control agent for suspended solids.
  • UNICHEM-3220 is best used for softened and low hardness water. The phosphate component.
  • UNICHEM-3220 reacts with the water hardness, whilst the polymer components provide transport of the calcium, magnesium, iron, phosphate and silica through the boiler, preventing scale adhering to the internal metal surfaces.

Application & Dosage Information

Use UNICHEM-3220 direct from the drum or mixed with soft water, or cool condensate in a dosing tank. In low pressure steam boilers (below 20 bar g) dose to generate 30 – 70ppm PO4 within the boiler water.

For best results dose UNICHEM-3220 continuously proportional to the feed water use. For further technical assistance please contact Unichem.

Product Properties

Appearance: Clear liquid
Solubility in water: Miscible
Odour: None
pH: 9.5-11
Flash Point: Not applicable
Flammability: Not applicable
Explosive Properties: Not applicable
Oxidising Properties: Not applicable
Vapour Pressure: Not determined
Relative Density: 1.20 approx

Product Benefits

  • Superior quality combined phosphate and polymer steam boiler treatment.
  • Excellent for use in softened and low hardness waters.
  • Performance scale inhibitor and control agent for suspended solids.
  • Phosphate must be used in boilers operating at pressures above 19 bar (150 psi) The ‘natural’ Alkalinity of the make-up after sulphite addition is less than 20% of the TDS or make-up is dealkalised.
  • Or when the make-up water is not efficiently softened
  • Polymer Phosphate treatment regimes precipitate magnesium & calcium hardness salts from boiler make-up water in the form of hydroxyapatite and serpentine.
  • These compounds form sludge, which, when properly conditioned with polymers, is removed from the boiler during blow down.
  • Polymeric dispersants or sludge conditioners are added with the phosphate to condition the sludge for improved removal from the boiler.
  • See UNICHEM 3220 for high-quality boiler phosphate treatment.