PSV

ASME’s NEW Section XIII – Dual PRD Systems

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

ASME has allowed dual PRD systems ever since I started in process safety back in 1993. These systems usually have a Rupture Disc (RD) BEFORE the Pressure Safety Valve (PSV). This is usually done to protect the more expensive and more complicated PSV from the corrosive process gases. Although I never managed a PR system…...

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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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