Rust & Scale Remover
DESCALING LIQUID has been developed for rapid and thorough cleaning of heat transfer surfaces by chemically removing rust and water scale.
It is a non-volatile liquid which is compounded from liquid acid, inhibitors, and wetting agents. DESCALING LIQUID is inhibited against attack on all metals except aluminum, zinc and magnesium.
It has unlimited shelf-life. DESCALING is also very useful for removal of Lime coating from cargo holds.
Applications
The cleaning method and time required depend on the character and thickness of the rust and scale, size of equipment to be cleaned, availability of circulation equipment, concentration of DESCALING LIQUID, temperature of cleaning solution, and presence of oily compounds covering rust and scale. However, the following is a general procedure that will prove effective in most cases:
- The heat exchange equipment to be cleaned is filled with solution comprised of 1 to 3 litres of DESCALING LIQUID per 10 litres of water. This solution is circulated throughout the system for 8 to 16 hours.
- The system is then flushed with fresh water which removes particulate matter and soluble salts.
- Then a 1% water solution of ALKLEEN LIQUID is circulated throughout the system for at least an hour to neutralize the acid and to prevent redepositing undissolved soils on the metal surfaces by its sequestering action. pH of the solution should remain above 8. If it drops below, add more ALCALCEAN LIQUID.
- Drain the ALCALCEAN LIQUID solution and flush twice with fresh water.
Usage
DESCALING LIQUID can be used effectively for cleaning nearly every type of equipment subject to rust and scale buildup. By lowering labour requirements and reducing equipment down time, DESCALING LIQUID has proven itself to be efficient and highly economical in cleaning of the following equipment and auxilaries ; fire-tube and water-tube boilers, condensers, super heaters, economisers, evaporators, steam and water lines, distillery equipment, air conditioning units, water jackets of internal combustion engines, cooling and piping systems etc.
General Information
- An alternative to continuous circulation is the soaking method in which the system is filled with the DESCALING solution and is allowed to soak for up to 24 hours. This method is recommended where adequate circulation cannot be provided.
- The cleaning procedure can be speeded up by maintaining the DESCALING solution at a temperature between 60°C (140°F) and 77°C (170°F), as well as by increasing the concentration. Circulation time could be cut down to 4 to 8 hours in such a case.
- Small amounts of oil deposits on the scale will not hamper the cleaning efficiency. However, large amounts of oily compounds covering the surface, or scale containing calcium sulphate and/or silicates will normally require a pretreatment by boiling out with a 5% solution of ALKACLEAN LIQUID for up to 24 hours. DEGREASOL can also be used to remove the oily compounds before descaling.
- It takes 20 Litres of DESCALING LIQUID to remove 10 kilos of Calcium-carbonate scale.
