Heavy-duty acid compound containing corrosion inhibitors and surfactants.
Features & Benefits
TECO DESCALING LIQUID EXTRA is suitable for removal of hardness scale and/or iron oxides from boilers, condensers, evaporators, heat exchangers, cooling systems, etc. It must not be used on zinc, aluminium, galvanized materials, cast iron and stainless steel.
Directions for use
Descaling can be accomplished by circulation. For large components and systems, use in-situ soaking. For small components soak in immersion bath. The most effective method is by circulation as it ensures renewal of acid film in contact with the scale.
If deposits to be removed are covered with oil or grease, a degreasing treatment with a solution of 2% to 8% of TECO TANK CLEAN ALKALINE, TECO CARBON REMOVER NC or TECO SEACLEAN VOYAGE with water should be carried out prior to descaling. Circulate solution for 4 to 6 hours with a temperature of 60°C.
After degreasing, start descaling treatment with a solution of 5% to 10% TECO DESCALING LIQUID EXTRA with water. The solution should be circulated for 1 to 4 hours for hardness scale, and 10 to 20 hours for iron oxide scale, depending on nature and state of the deposits.
Ensure circuit is vented at the highest point to release gases produced during the descaling treatment. Cleaning solution may be heated to 40°C in order to increase the descaling process rate. Check the acid concentration of the solution regularly. If it drops to less than 1/2 initial concentration, regenerate the solution by adding more TECO DESCALING LIQUID EXTRA. Determination of the acid concentration may be found using an acidity test kit (obtainable from TECO CHEMICALS).
The progress of operation may be followed by placing scale samples in easily observed positions. When the samples are completely dissolved and effervescence has stopped, circulate for one more hour then drain system thoroughly. Rinse thoroughly with water, then drain.
Procedure is similar to that for circulation, i.e. degreasing, descaling (ensuring venting), rinsing and neutralising. The same solution strengths should be used. If the descaling solution can be agitated, this will help to renew the acid film coming into contact with the scale.
TECO DESCALING LIQUID EXTRA is usually available in plastic cans of 25 l and plastic drums of 200 l.