DESCALEX/SAF-ACID  POWDER is a Sulphamic acid biased dry acid cleaner used for removing scale and rust deposits over aluminum, copper, zinc, galvanized metals, steel boilers, cooling systems, ejection machines, condense lines and climate systems.

• Penetrates thoroughly and removes quickly scale deposits from all kinds of surfaces including metals such as aluminum, zinc, galvanize.
• Effectively cleans the contaminated surfaces with the inhibitors in its formula.
• Has no effect on rubber and plastic surfaces.
• Contains color acid indicator to show the strength of the solution.
• Low cost and easy to use and apply.

If the system to be cleaned is contaminated by oil, grease and carbonic oil, you must make a pre-cleaning with ER-APC in order to remove them. Then, DESCALEX/SAF-ACID POWDER is used for cleaning scale deposits from the surface.

DESCALEX/SAF-ACID POWDER is used by diluting with water. Dilution rates vary for each application method. Circulation and soaking methods are appropriate to apply DESCALEX/SAF-ACID POWDER.

For circulation method, 5-10 kg of DESCALEX/SAF-ACID POWDER is used by diluting in 100 liters of water. System is cleaned by circulation of concentrated solution for 24 hours. 24 hours circulation is advised to accomplish cleaning.

For soaking method, 1-1,5 kg of DESCALEX/SAF-ACID POWDER is diluted in 9 liters of water. The parts to be cleaned are immersed in a bath filled with diluted solution. For better results continuous flow of the solution in the immersion bath should be provided.

After each cleaning procedure the system or media should be rinsed with fresh water. To ensure full neutralization a second circulation or immersion is advised with a solution prepared with ERAY which is another Ertek product. (Otherwise, rust contamination will form again in a short time at the system or over the media).

1. Boilers/ Turbine condenser

Install vent piping from a top opening in the boiler to the outside.

Disconnect the bottom blowdown piping and install a “tee.” Run a line from one end of the tee to waste water collection tank. Install a shut-off valve in this line. Run a line from the circulating pump discharge to the other end of the tee. Run a line from the bottom of the mix tank to the suction side of the circulating pump. Run another line from the top of the boiler to the top of the mix tank. Set all valves properly. Fill the boiler to the bottom of the gauge glass with water as well as the mix tank, pump and hoses. Fire the boiler using a low fire until the temperature of the water reaches 65° C (150° F). Start the circulating pump and regulate the flow of solution so that the pump removes water from the mix tank at the same rate it is added. Circulation will be from the bottom to the top of the condenser/boiler. Refer to Diagram 1 for circulation through the boiler or condenser.

Slowly add the proper amount of Descalex/SAF-ACID descaling compound to the mix tank. A 10% by weight solution will be required. Refer to the dosage chart to determine the required amount of Descalex/SAF-ACID compound to add to the mix tank to make a 10% by weight solution relative to the size of the boiler. When the acid cleaning solution is exhausted, it turns from a gold to green color. If this occurs, add approximately 25% of the initial dose of Descalex/SAF-ACID descaling compound. Cleaning is complete when the strength of SAF-ACID descaling compound holds steady for at least two (2) hours as indicated by a steady gold color. After two (2) hours, stop the acid pump, drain and flush the boiler. After the boiler is flushed, fill the boiler with water and add the required amount of GCTM concentrated alkaline liquid to obtain a 1% solution. Refer to the dosage chart to determine the required amount of GC liquid to make a 1% solution. This will neutralize any acid remaining in the equipment. Circulate the neutralizing solution for a minimum of two (2) hours. Once neutralized, drain and inspect the boiler. If necessary, flush with a high-pressure hose to remove any loose matter. If satisfactory, return the boiler to normal operating condition by disconnecting the vent pipe and tee and reconnecting the blowdown line, etc. If not returned to service, the boiler must be passivated. Check with your local Drew Marine representative for passivation procedures.

2. Evaporators/Heat Exchangers/chiller Condenser

Add Descalex/ SAF-ACID™ descaling compound slowly to the tank of water, stirring if necessary until the desired quantity of acid is dissolved. Refer to the dosage chart for the amount of acid required. Circulate the acid cleaning solution at a temperature of 60-70° C (140-160° F). The solution may be heated by either the introduction of steam or the use of an immersion heater. If the equipment is badly scaled, it may be necessary to discard the cleaning solution and make a fresh batch. Cleaning is complete when the SAF-ACID strength holds constant for at least half an hour as indicated by a steady gold color. Cleaning is generally accomplished in 2-6 hours. Drain the cleaning solution and flush the system. Refill with water and add the required amount of GC concentrated alkaline liquid. Refer to the dosage chart for making a 1% neutralizing rinse solution. Circulate for 1/2 to 1-1/2 hours, then drain the system. Inspect the system and return to service.

NOTE: While cleaning galvanized, aluminum, zinc metals, the cleaning time must be limited with 1-2 hours under control.