It is common practice in the ammonia refrigeration industry to install a three-way isolation valve upstream of relief valves protecting an ammonia refrigeration pressure vessel. For vessels larger than 10 ft3, this is required by most model codes and standards. These three-way valves allow a relief valve to be replaced without the hassle of pumping […]
A historic ammonia accident, a scary near-miss, and repairs made in outer space: all in this week’s edition of the Ammonia Week in Review… On May 11, 1976, an Ammonia Truck Disaster Killed Several Houstonians, Led to Major Change – May 11 marks the 42nd anniversary of one of the scariest moments in Houston history, when a […]
It’s widely known that pressure vessels must be equipped with over-pressure protection (2015 ASME B&PVC UG-125), often in the form of a pressure relief valve. Properly sizing a relief valve requires engineering analysis which accounts for the type of over-pressure scenarios that might occur. In most cases, model codes and standards (RAGAGEPs) specify the relief […]
A small town’s economy suffers due to an ammonia leak in this week’s edition of: • Ammonia Week in Review • Figure Skaters, Hockey Players Sidelined with Gander Arena Closure – “It’s a huge event for restaurants, hoteliers, all local businesses, and I’m sure restaurants have ordered excess inventory to supply all the people, which is not happening […]
Peter Thomas, P.E. recently wrote a technical paper and presented at the 2017 RETA National Conference on the topic of RAGAGEP: Codes, Standards, and Good Engineering Practices. This is the seventh in a series of blogs which include excerpts from his technical paper. The previous blogs are available in the following links: Part 1, Part 2, Part 3, Part 4, Part 5, and Part […]
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