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Using ammonia in pickling solution





November 21, 2008

Dear Sir,
I'm an engineer working in field of industrial hydraulics. After high pressure piping execution its a must to finish inside the pipes in some steps including mechanical cleaning , chemical cleaning and oil flushing.
Recently, I saw a procedure for chemical cleaning using 3% citric acid solution, but increasing ph value up to 3.5 by adding ammonia before circulating in the system.
Now here is my question! why adding ammonia. if ammonia is added only for controlling ph why they don't reduce citric acid percentage?

Regards,

Ghasem Shilati
hydraulic engineer - TEHRAN, IRAN


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