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304 SS pipe corrosion in liquid ammonia solution

A vessel used for vaporizing and pre-heating liquid ammonia ⇦ this on eBay or Amazon [affil links] , and small quantity water left in the bottom of its reboiler and it is seldom drained. Corrosion was found in the reboilder bottom pipe which is 304 SS. We changed the corroded pipe, but the corrosion happened once again in less than half a year.
The system temperature is ~130degC and pressure is 2 barg. I doubt ammonia carbamate formed and deposit there and causing corrosion. Is it reasonable? What measures should be taken for this problem?

Gail Chen
Lona - Visp, Swiss
October 7, 2008

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