SP-143-2012
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SP-143-2012

Live-Loaded Valve Stem Packing Systems

Forward:
This Standard Practice was developed by a cooperative effort of representatives of valve and packing manufacturers. This Standard Practice is intended primarily to be an aid in the design and application of live-loaded packing systems. This Standard Practice represents the consensus input from a broad spectrum of industry representatives.
This Standard Practice should not be construed to be effective for all pressures and types of services expected of ASME B16.34 valves.
Scope:
This Standard Practice establishes the minimum requirements for the application, design and installation of live-loaded stem packing systems for valves designed in accordance with ASME B16.34, having rising and/or rotating stems. It applies to valves with flexible graphite, polytetrafluoroethylene (PTFE), or other packing stem seal material, regardless of frequency of operation.
This Standard Practice does not apply to valves that include a lantern ring(s) as part of its packing system or to self-energized packing.

     


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April 21, 2019

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