(3) Check the metal temperatures particularly steam drum before injecting acid, the before and during each pumping This can be down by using operation. thermocouples located at critical points or by contact pyrometer. It should be noted that THE TEMPERATURE is EACTOR in AMosT CRITICAL the procedure. Too low a temperature, under 50 degree C, will result in poor dissolution of most deposits. Too high a temperature, more than 80 degree C for most inhibitors, will increase the corrosion rate appreciably, if not to a damaging degree. Stay within the temperature limits prescribed by the manufacturer of the inhibitor. If there is any doubt, stay under a temperature of 65 degree C. (4) After draining out the acid, wash down the boiler with fresh water, using the same washing process as described after boiling out. (5) The boiler should be boiled out with an alkaline solution (see Boiling out. This is to both clean the boiler of suspended particles and to return all surfaces to an alkaline base. (6) After boiling out, wash the boiler with a strong stream of hot fresh water with a hose, (7) After acid cleaning DO NOT ENTEROR WORK in the boiler until it has been filled at least once with water, and preferably after the boiling out process.
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