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MSS: Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. MSS: Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
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Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit standards developing organization that is devoted to the development of the industry. Standards written by MSS address valves, valve actuators, valve modification, pipe fittings, pipe hangers, pipe supports, flanges, and associated seals. These materials and associated guidelines are used in almost every industry, and are found in facilities for waste management, nuclear energy, and oil refining.
 
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ANSI/MSS SP-114-2007

Revises MSS SP-114-2007
Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000
       Price: $104.00
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ANSI/MSS SP-122-2017

Revises MSS SP-122-2012
Plastic Industrial Ball Valves
       Price: $80.00
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ANSI/MSS SP-134-2012

Revises MSS SP-134-2012
Valves for Cryogenic Service, including Requirements for Body/Bonnet Extensions
       Price: $165.00
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ANSI/MSS SP-135-2016

Revises MSS SP-135-2010
High Pressure Knife Gate Valves
       Price: $119.00
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ANSI/MSS SP-138-2014

Revises MSS SP-138-2009
Quality Standard Practice for Oxygen Cleaning of Valves and Fittings
       Price: $140.00
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ANSI/MSS SP-144-2013

Revises MSS SP-144-2013
Pressure Seal Bonnet Valves
       Price: $130.00
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ANSI/MSS SP-25-2013

Revises MSS SP-25-2008
Standard Marking System for Valves, Fittings, Flanges, and Unions
       Price: $165.00
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ANSI/MSS SP-44-2010

Amended by MSS SP-44-2016
Revises MSS SP-44-2010
Steel Pipeline Flanges
       Price: $220.00
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ANSI/MSS SP-44-2016 (Reissue 2017)

Revises MSS SP-44-2016
Steel Pipeline Flanges (Replaces Original 2016 Edition) (Includes Errata Sheet 2)
       Price: $231.00
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ANSI/MSS SP-55-2011

Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation of Surface Irregularities (NOTE: This PDF version of ANSI/MSS SP-55-2011 is for reference only. To obtain the official inspection version of ANSI/MSS SP-55-2011, it is available in hard copy only and must be purchased from MSS directly).ö
       Price: $167.00
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