During a routine outage of their boiler our client asked us to assist with the cleaning of the gas passes on the fire side to remove acidic deposits and unwanted fouling.
As per normal outages we cleaned the tube surfaces back to bare metal however the air heater was fairly choked up with sulphur and other contaminants. We treated the air heater baskets with a mild chemical mix and washed off after to give quite spectacular results as seen in the before and after pictures above.
Needless to say our client was over the moon!!