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Using ammonia in pickling solution

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 ⇦ on eBay or Amazon [affil link] solution, but increasing ph value up to 3.5 by adding ammonia ⇦ on eBay or Amazon [affil link] 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
November 21, 2008

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