If you have been around ammonia refrigeration very long you have most likely heard a horror story or two related to “draining an oil pot”.  This task is also very well know by OSHA and EPA inspectors and is often used as a point of review for operating and maintenance procedures during PSM/RMP inspections.  So to best lay this all out in some logical progression lets first look at the task in a larger picture. (UPDATED on 4/11/12 with ANSI/IIAR 2-2008, Section 14.2 references)

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