Over the years I have been told time and time again that there are two absolutes in ammonia refrigeration. #1 – we do not have “temporary operational conditions” so we have no need for “temporary operating procedures” and #2 – there is no “process chemistry” in ammonia refrigeration. But it dawned on me this week that I had beaten the “temp operating procedures” to death over the past 20 years but a friend pointed out that he was unable to find anything about “process chemistry” requirements in ammonia refrigeration, as such we had discussed for years. So here it goes.
First things first, what does PSM/RMP require in terms of process chemistry…