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MSS SP 143

Live-Loaded Valve Stem Packing Systems

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Organization: MSS
Publication Date: 1 January 2012
Status: inactive
Page Count: 16
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

Document History

MSS SP 143
January 1, 2018
Live-Loaded Valve Stem Packing Systems
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...
MSS SP 143
January 1, 2012
Live-Loaded Valve Stem Packing Systems
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...

References

This document references:
ASTM A681 - Standard Specification for Tool Steels Alloy
Published by ASTM on October 1, 2008
This specification covers the chemical, mechanical, and physical requirements for available wrought alloy tool steel products. These products, which include hot or cold finished bar, plate, sheet,...
This document references:
ASTM B103/B103M - Standard Specification for Phosphor Bronze Plate, Sheet, Strip, and Rolled Bar
Published by ASTM on October 1, 2019
This specification establishes the requirements for copper-tin alloy (phosphor bronze), copper-tin-lead alloy (leaded phosphor bronze), and copper-tin-lead-zinc alloy (bearing bronze), plate, sheet,...
This document references:
ASTM A506 - Standard Specification for Alloy and Structural Alloy Steel, Sheet and Strip, Hot-Rolled and Cold-Rolled
Published by ASTM on May 1, 2016
This specification covers hot-rolled and cold-rolled alloy and structural alloy-steel sheet and strip. Alloy steel is furnished to chemical composition requirements and is intended primarily for...
This document references:
MSS SP 96 - Terminology for Valves, Fittings, and Their Related Components
Published by MSS on January 1, 2017
This Standard Practice lists and defines principle terms, acronyms, and abbreviations that are widely used to describe valves, fittings, and their related components. It is comprised of separate...
This document references:
B637 - Standard Specification for Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock for Moderate or High Temperature Service
December 1, 2023
This specification2 covers hot- and cold-worked precipitation-hardenable nickel alloy rod, bar, forgings, and forging stock for moderate or high temperature service (Table 1). The values stated in...
This document is referenced by:
MSS SP 80 - Bronze Gate, Globe, Angle, and Check Valves
Published by MSS on January 1, 2019
This Standard Practice establishes requirements for bronze gate, globe, angle, and check valves for general purpose services and provides requirements for the following: a) Pressure-Temperature...
This document is referenced by:
MSS SP 111 - Gray-Iron and Ductile-Iron Tapping Sleeves
Published by MSS on January 1, 2020
This Standard Practice covers the performance and design requirements of gray-iron or ductile-iron tapping sleeves used in water and sewage systems. Tapping sleeves are used with tapping valves to...
This document is referenced by:
RP 615 - Valve Selection Guide
Published by API on August 1, 2022
This recommended practice (RP) provides general guidance on valve selection for the hydrocarbon processing industry (HPI), which includes refineries, petrochemical, chemical, liquefied natural gas...
This document is referenced by:
MSS SP 137 - Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components
Published by MSS on January 1, 2020
This Standard Practice provides methods and acceptance standards for Positive Material Identification (PMI) of metal flanges, fittings, valves, pressure boundary parts of valves, and other piping...
This document is referenced by:
MSS SP 144 - Pressure-Seal Bonnet Valves
Published by MSS on January 1, 2020
This Standard Practice covers construction requirements for steel and alloy valves having pressure-seal bonnets in the size range of NPS 2 (DN 50) through NPS 50 (DN 1250) and Pressure Classes 600,...
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