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 known 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)