The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announced that SP-151-2021, Pressure Testing of Knife Gate Valves, was recently revised and published by MSS.
SP-151 was published in 2016 to provide a uniform means of testing knife gate valves used in the ‘full open’ and ‘full closed’ type of service for isolation. SP-151 continues to be maintained under the consensus of MSS Technical Committee 409, Knife Gate Valves. The standard establishes requirements and acceptance criteria for shell and seat closure pressure testing of resilient, non-metallic (ceramic), and metal-to-metal seated knife gate valves of all types.
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