Boiler Acid Cleaning Procedure
Below shows approximate time frame for a boiler acid cleaning and responsibilities of RTA Water Treatment and customer personnel. Also see Boiler Acid Rinse.
1st Day-Add acid cleaning solution
Set up equipment to feed acid cleaning solution into the side of the boiler; pipe vent from top of boiler to a half full barrel of water. Insert all handholes not already inserted, and add the remaining antifoam, inhibitor and acid to the boiler: start firing boiler; do adjustments in acid strength. Continue firing the boiler, and raise temperature slowly to approximately 160 deg F. Let the boiler simmer overnight.
Next Day -Drain acid solution, then add neutralizer
Cool boiler. Remove all handholes and completely rinse boiler from top to bottom. Inspect the inside of the boiler. Add neutralizer, re-fill and reheat the boiler to near boiling. At this point the cleaning process is complete.
One or 2 days later-Drain, flush and rinse again
When boiler is cool to 140 deg F or lower, drain boiler again, take handholes out, and do another complete rinsing of boiler from to bottom. Fill and drain the boiler a second time. Install new gaskets, fill, add antifoam, add chemical, and get ready for operation. (No need to rinse boiler again this time.)