NFPA 58

Inspection and Maintenance of Remote Emergency Shutoff Valves

/ Chemical Process Safety (PSM/RMP), Hazardous Materials / / , , ,

We have discussed these safety-critical valves extensively here at SAFTENG. I am a huge proponent of these valves, and they are required by most State Fire Codes and RAGAGEPs. Yet, we still find far too many processes handling Highly Hazardous Chemicals/Extremely Hazardous Chemicals that are missing this critical safety feature. As we have also discussed,…...

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3-Way Valve under Hydrostatic RV?

/ Chemical Process Safety (PSM/RMP), Hazardous Materials / / , , , , , ,

Processes that handle Liquified Pressurized Gases are required to have Hydrostatic Relief Valves on liquid piping where the liquid can be trapped. Much like vapor/gas phase Pressure Safety Valves, it is frowned upon when we have an intervening valve under the PSV. However, many codes today ALLOW us to install a 3-way valve below the…...

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