MSS SP-81

Stainless-Steel or StainlessSteel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends

Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22180-4602 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: [email protected] Copyright Manufacturers Standardization Society of the Valve and Fittings Indust Provided by IHS under license with MSS No reproduction or networking permitted without license from IHS

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®

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MSS SP-81-2013

MSS

STANDARD PRACTICE

SP-81

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 114 and the MSS Coordinating Committee. Maintenance of this Standard Practice is now the responsibility of MSS Technical Committee 409, as of the date of this publication. The content of this Standard Practice is the resulting efforts of competent and experienced volunteers to provide an effective, clear, and non-exclusive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and is intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not in itself preclude the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this Standard Practice is established only by reference in other documents such as a code, specification, sales contract, or public law, as applicable. MSS has no power, nor does it undertake, to enforce or certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and is solely the responsibility of the certifier or maker of the statement. “Unless indicated otherwise within this MSS Standard Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex A). This Standard Practice shall remain silent on the validity of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed.” By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) or of any patent rights in connection therewith. MSS shall not be held responsible for identifying any patent rights. Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. In this Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be essential to the understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental information does not include mandatory requirements. The SI (metric) units and U.S. customary units in this Standard Practice are regarded separately as the standard; each should be used independently of the other. Combining or converting values between the two systems may result in non-conformance with this Standard Practice. This Standard Practice has been substantially revised from the previous 2006a edition. It is suggested that if the user is interested in knowing what changes have been made, that direct page by page comparison should be made of this document and that of the previous edition. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified.

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Excerpts of this Standard Practice may be quoted with permission. Credit lines should read ‘Extracted from MSS SP-81-2013 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry.'. Reproduction and/or electronic transmission or dissemination is prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Published: August 1975 Current 2013 Edition Approved: October 2012 (Updated March 2013) Current 2013 Edition Published: May 2013 MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright ©, 2013 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A.

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MSS

STANDARD PRACTICE

SP-81

TABLE OF CONTENTS SECTION 1 2 3 4 5 6 7 8 9 10 11

PAGE

SCOPE AND FIELD OF APPLICATION .......................................................................................... 1 STANDARD UNITS ........................................................................................................................... 1 PRESSURE RATING ......................................................................................................................... 1 SIZE ..................................................................................................................................................... 1 MARKING .......................................................................................................................................... 1 MATERIALS ...................................................................................................................................... 2 DESIGN ............................................................................................................................................... 2 WELDING ........................................................................................................................................... 2 TOLERANCES ................................................................................................................................... 2 PRODUCTION TEST ......................................................................................................................... 2 SHIPPING INFORMATION .............................................................................................................. 3

TABLE 1 2 3 4

Valve Dimensions, Inches ................................................................................................................... 4 Valve Dimensions, Millimeters ........................................................................................................... 4 Materials .............................................................................................................................................. 5 Equivalent Stainless Steel Grades ........................................................................................................ 5

ANNEX A

Referenced Standards and Applicable Dates ....................................................................................... 6

ii

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MSS

STANDARD PRACTICE

SP-81

STAINLESS-STEEL OR STAINLESS-STEEL-LINED, BONNETLESS, KNIFE GATE VALVES WITH FLANGED ENDS 1. SCOPE AND FIELD OF APPLICATION 5. MARKING

1.1 This Standard Practice covers all stainless-steel or stainless-steel-lined, cast, or fabricated bonnetless, knife gate valves with flanged ends from size NPS 2 (DN 50) through NPS 36 (DN 900).

The valve shall be marked in accordance with MSS SP-25, including the following requirements and modifications: a) Manufacturer’s name or trademark/logo.

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1.2 The valves identified in this Standard Practice are intended for use in applications where shock loadings are not encountered. Applications at conditions other than those specified in Section 3 require special design considerations.

b) The body material of construction or code, when more than one material or grade of material is used, shall each be identified. The material in contact with the fluid media shall be listed and identified as “lining” on the name plate. It is not required to repeat the material designation of fabricated bodies.

2. STANDARD UNITS The values stated in either U.S. customary units or SI (metric) units are to be regarded separately as the “standard”. Within the text, the SI (metric) units are shown in parenthesis. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with this Standard Practice.

c) Since most valves are manufactured for closure in one direction only, the valve shall be marked showing the “seat side” (downstream side) of the valve in such a manner that the markings can be seen with the valve installed in the pipeline. The user shall be responsible for correct directional installation. When bidirectional performance is required, testing in the reverse direction from the seat shall be as per agreement between the customer and the manufacturer. Markings shall still indicate the seat side of the valve. Bi-directional designs do not require a flow direction indicator.

3. PRESSURE RATING This Standard Practice covers valves with a gauge pressure rating not exceeding the values in the following table, at temperatures between 32 °F and 150 °F (0 °C and 66 °C). U.S. Customary NPS psi 2 – 24 150

SI (Metric) DN bar 50 – 600 10.3

30, 36

750, 900

100

d) The valve shall be marked for installation purposes, indicating: 1) Care to be taken in valve installation with respect to direction of closure. 2) Care to be taken when installing studs or bolts in the tapped holes of the flange in the area of the chest to prevent chest damage. The “chest” is the body area between the packing chamber and the flanges. 3) Packing nuts may require adjustment to obtain a tight seal.

6.9

4. SIZE The valve sizes in Table 1 (NPS) and Table 2 (DN) are the nominal sizes of the end connections.

e) The stem material need not be listed. 1 Copyright Manufacturers Standardization Society of the Valve and Fittings Indust Provided by IHS under license with MSS No reproduction or networking permitted without license from IHS


MSS

STANDARD PRACTICE

6. MATERIALS

SP-81

7.4 The valve port I.D. shall not be less than 90 percent (90%) of the nominal inside diameter of Schedule 40 pipe.

6.1 Materials used for major components of these valves are listed in Table 3. Equivalent stainless steel grades are listed in Table 4.

7.5 Because of variations in basic valve design, differential pressure, and valve accessibility, it is not possible to standardize the conditions under which a manually operated valve requires mechanical assistance.

6.2 Materials for stainless-steel-lined knife gate valves, per Tables 3 and 4 of this Standard Practice, shall be by agreement between purchaser and manufacturer.

Consideration should be given to the use of mechanical assistance on all valves over NPS 8 (DN 200) when the differential pressure, during valve operation, approaches the valve’s rated working pressure. In addition, consideration should be given to the use of mechanical assistance on all NPS 16 (DN 400) valves and larger, regardless of differential pressure.

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7.1 Valves shall be all stainless steel or stainless-steel-lined, by agreement as per Section 6.2. All interior wetted surfaces, including raised faces, gasket and packing chamber surfaces shall be stainless steel. Liners shall be sealed to insure internal leakage cannot penetrate to the outer shell. With the exception of hard facing overlays and coatings, all internal wetted parts shall have a corrosion resistance at least equivalent to the trim items (stem, gate, or seat rings) or valve liner; whichever is considered to have the lesser corrosion resistance. Hard face overlays (Cobalt or Ni-Cr types) on valve seating surfaces or wear surfaces are acceptable. Coatings applied to internal wetted surfaces shall be by agreement between the manufacturer and user.

8. WELDING All body pressure boundary welds shall be in accordance with the ASME Boiler and Pressure Vessel Code, Section IX. 9. TOLERANCES The following tolerances shall be followed: Face-to-face: NPS 10 (DN 250) and smaller +0.06 in. (+1.6 mm)

Dimensions shall be in accordance with Table 1 (inches) or Table 2 (millimeters).

NPS 12 (DN 300) and larger +0.12 in. (+3.2 mm)

7.2 The design of all valves shall prevent permanent distortion of the body or seats when tested as specified in Section 10. Some permanent distortion of stainless-steel parts is acceptable during the shell test of Section 10.1 provided it can be demonstrated that there will be no further deformation upon subsequent pressure loadings.

Flange outside diameter: +0.06 in. (+1.6 mm) Bolt circle diameter drilling: +0.06 in. (+1.6 mm) Center-to-center of adjacent bolt holes: +0.03 in. (+0.8 mm)

7.3 When through-bolting is specified, valves shall have flange holes per ASME B16.5 for sizes NPS 2 (DN 50) through NPS 24 (DN 600) for Class 150, and per ASME B16.47 Series A for sizes larger than NPS 24 (DN 600), see Table 1 (NPS) and Table 2 (DN); except holes that contact the chest shall be tapped in accordance with Table 1 or Table 2.

10. PRODUCTION TEST 10.1 Shell Test (Body) Each valve shall be hydrostatically pressure tested at 1.5 times the rated working pressure with no visible leakage allowed (leakage through the packing or gate seal shall not be cause for rejection).

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MSS

STANDARD PRACTICE

The test fluid shall be water (which may contain a corrosion inhibitor), kerosene, or another suitable fluid provided such fluid has a viscosity that is not greater than that of water. The test fluid temperature shall not exceed 125 °F (50 °C). 10.2 Seat Test After the shell test, each valve shall be hydrostatically pressure tested at 40 psi (2.8 bar) differential pressure in the direction of closure. Maximum permissible leakage shall be 40 ml/min/NPS (1.6 ml/min/DN). Seat test duration shall be in accordance with MSS SP-61. 11. SHIPPING INFORMATION 11.1 Valve packing nuts may be loosened prior to shipment to extend packing life. These nuts may have to be adjusted after installation. 11.2 Unless indicated otherwise, valves shall be shipped with covers to protect the raised face of the flanges.

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SP-81

MSS

STANDARD PRACTICE

SP-81

TABLE 1 Valve Dimensions, Inches Flanges Valve Size (NPS)

Bolting Tap Size

Clearance Hole Diameter(a)

Thickness Minimum (Includes 0.06" Raised Face)

4 4 8

5/8 – 11 5/8 – 11 5/8 – 11

0.75 0.75 0.75

0.50 0.50 0.50

1.88 2.00 2.00

8.50 9.50 11.75

8 8 8

3/4 – 10 3/4 – 10 3/4 – 10

0.88 0.88 0.88

0.63 0.63 0.63

2.25 2.25 2.75

12.75 15.00 16.25

14.25 17.00 18.75

12 12 12

7/8 – 9 7/8 – 9 1–8

1.00 1.00 1.12

0.75 0.75 0.81

2.75 3.00 3.00

23.50 25.00 27.50

18.50 21.00 23.00

21.25 22.75 25.00

16 16 20

1–8 11⁄8 – 7 11⁄8 – 7

1.12 1.25 1.25

0.88 0.94 1.00

3.50 3.50 4.50

32.00 38.75 46.00

27.25 33.75 40.25

29.50 36.00 42.75

20 28 32

1¼ – 7 1¼ – 7 1½ – 6

1.38 1.38 1.62

1.00 1.12 1.12

4.50 4.62 4.62

Outside Diameter(a)

Raised Face Outside Diameter(a)

Bolt Circle Diameter(a)

2 3 4

6.00 7.50 9.00

3.62 5.00 6.19

4.75 6.00 7.50

5 6 8

10.00 11.00 13.50

7.31 8.50 10.62

10 12 14

16.00 19.00 21.00

16 18 20 24 30 36

Quantity

(a)

(b)

Face-to-Face

NOTES: (a) In conformance with ASME B16.5, Class 150 for sizes NPS 2 through 24 and per ASME B16.47 Series A for sizes > NPS 24. (b) Eight-thread series (8-UN) may be used for bolting greater than one inch, as recommended by ASME B16.5 and ASME B16.47 for steel flanges.

TABLE 2 Valves Dimensions, Millimeters Valve Size (DN)

Outside Diameter(a)

Raised Face Outside Diameter(a)

Bolt Circle Diameter(a)

50 80 100

150.0 190.0 230.0

92.0 127.0 157.5

120.5 152.5 190.5

125 150 200

255.0 280.0 345.0

186.0 216.0 270.0

250 300 350

405.0 485.0 535.0

400 450 500 600 750 900

Bolting Tap Size(b)(c)

Clearance Hole Diameter(a)

Thickness Minimum (Includes 1.5 mm Raised Face)

4 4 8

5/8 – 11 5/8 – 11 5/8 – 11

18.0 18.0 18.0

12.7 12.7 12.7

48.0 51.0 51.0

216.0 241.5 298.5

8 8 8

3/4 – 10 3/4 – 10 3/4 – 10

22.0 22.0 22.0

16.0 16.0 16.0

57.0 57.0 70.0

324.0 381.0 413.0

362.0 432.0 476.0

12 12 12

7/8 – 9 7/8 – 9 1–8

26.0 26.0 28.4

19.1 19.1 20.6

70.0 76.0 76.0

600.0 635.0 700.0

470.0 533.5 584.5

540.0 578.0 635.0

16 16 20

1–8 11⁄8 – 7 11⁄8 – 7

28.4 32.5 32.5

22.4 23.9 25.4

89.0 89.0 114.0

815.0 985.0 1170.0

692.5 857.0 1022.0

749.5 914.0 1086.0

20 28 32

1¼ – 7 1¼ – 7 1½ – 6

35.5 35.5 42.0

25.4 28.4 28.4

114.0 117.0 117.0

Quantity

(a)

Face-to-Face

NOTES: (a) In conformance with ASME B16.5, Class 150 for sizes DN 50 through 600 and per ASME B16.47 Series A for sizes > DN 600. (b) U.S. customary units apply, per ASME B16.5 and B16.47 bolting requirements. (c) Eight-thread series (8-UN) may be used for bolting greater than one inch, as recommended by ASME B16.5 and ASME B16.47 for steel flanges.



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Flanges

MSS

STANDARD PRACTICE

SP-81

MATERIAL

ASTM NUMBER

Stainless-Steel Plate

A240/A240M

Stainless-Steel Bar

A276

Stainless-Steel Casting

A743/A743M or A351/A351M

Carbon-Steel Plate

A283/A283M, A36/A36M, or A285/A285M

Carbon-Steel Casting

A216/A216M

Bronze Casting

B62

Iron Casting

A126, Class B

TABLE 4 Equivalent Stainless Steel Grades WROUGHT

CAST

304

CF-8

316

CF-8M

317

CG-8M

304L

CF-3

316L

CF-3M

317L

CG-3M



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TABLE 3 Materials

MSS

STANDARD PRACTICE

SP-81

ANNEX A Referenced Standards and Applicable Dates This Annex is an integral part of this Standard Practice and is placed after the main text for convenience. Standard Name

Description

ASME; ANSI/ASME B16.5-2009 B16.47-2011 BPVC-IX-2013

Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications

ASTM A36/A36M-12 A126-04(2009) A216/A216M-12

Standard Specification for: Carbon Structural Steel Gray Iron Castings for Valves, Flanges, and Pipe Fittings Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications Stainless Steel Bars and Shapes Low and Intermediate Tensile Strength Carbon Steel Plates Pressure Vessel Plates, Carbon Steel, Low- and Intermediate-Tensile Strength Castings, Austenitic, for Pressure-Containing Parts Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application Composition Bronze or Ounce Metal Castings

A240/A240M-12a A276-10 A283/A283M-12 A285/A285M-12 A351/A351M-12b A743/A743M-12 B62-09

MSS SP-25-2008 SP-61-2013

Standard Marking System for Valves, Fittings, Flanges, and Unions Pressure Testing of Valves

The following organizations appear in the above list: American National Standards Institute, Inc. 25 West 43rd Street, Fourth Floor New York, NY 10036-7406

ASME

American Society of Mechanical Engineers (ASME International) Two Park Avenue New York, NY 10016-5990

ASTM

ASTM International 100 Barr Harbor Drive, P.O. Box C700 West Conshohoken, PA 19428-2959

MSS

Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, VA 22180-4602

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ANSI


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TITLE SP-6-2012 SP-9-2013 SP-25-2008 SP-42-2013 SP-43-2013 SP-44-2010 SP-45-2003 SP-51-2012 SP-53-2012 SP-54-2013 SP-55-2011 SP-58-2009 SP-60-2012 SP-61-2013 SP-65-2012 SP-67-2011 SP-68-2011 SP-69-2003 SP-70-2011 SP-71-2011 SP-72-2010a SP-75-2008 SP-78-2011 SP-79-2011 SP-80-2013 SP-81-2013 SP-83-2006 SP-85-2011 SP-86-2009 SP-87-1991 SP-88-2010 SP-91-2009 SP-92-2012 SP-93-2008 SP-94-2008 SP-95-2006 SP-96-2011 SP-97-2012 SP-98-2012 SP-99-2010 SP-100-2009 SP-101-1989 SP-102-1989 SP-104-2012 SP-105-2010 SP-106-2012 SP-108-2012 SP-109-2012 SP-110-2010 SP-111-2012 SP-112-2010 SP-113-2012 SP-114-2007 SP-115-2010 SP-116-2011 SP-117-2011 SP-119-2010 SP-120-2011 SP-121-2006 SP-122-2012 SP-123-2013 SP-124-2012 SP-125-2010 SP-126-2013 SP-127-2001 SP-128-2012 SP-129-2003 SP-130-2013 SP-131-2010 SP-132-2010 SP-133-2010 SP-134-2012 SP-135-2010 SP-136-2007 SP-137-2013 SP-138-2009 SP-139-2010 SP-140-2012 SP-141-2012 SP-142-2012 SP-143-2012 SP-144-2013 SP-145-2013

Listing of MSS Standard Practices (as of May, 2013) Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings Spot Facing for Bronze, Iron, and Steel Flanges Standard Marking System for Valves, Fittings, Flanges, and Unions Corrosion-Resistant Gate, Globe, Angle, and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600) Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications Steel Pipeline Flanges (incl. 2011 Errata Sheet) (R 2008) Bypass and Drain Connections Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Magnetic Particle Examination Method Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Radiographic Examination Method Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of Surface Irregularities (ANSI-approved American National Standard) Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation (incorporates content of SP-69, 77, 89, and 90) (ANSI-approved American National Standard) Connecting Flange Joints between Tapping Sleeves and Tapping Valves Pressure Testing of Valves High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets Butterfly Valves High Pressure Butterfly Valves with Offset Design Pipe Hangers and Supports – Selection and Application (ANSI-approved American National Standard) Gray Iron Gate Valves, Flanged and Threaded Ends Gray Iron Swing Check Valves, Flanged and Threaded Ends (incl. 2013 Errata Sheet) Ball Valves with Flanged or Butt-Welding Ends for General Service Specification for High-Test, Wrought, Butt-Welding Fittings Gray Iron Plug Valves, Flanged and Threaded Ends Socket Welding Reducer Inserts Bronze Gate, Globe, Angle, and Check Valves Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends Class 3000 Steel Pipe Unions Socket Welding and Threaded Gray Iron Globe & Angle Valves, Flanged and Threaded Ends Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators (Incl. 2011 Errata Sheet) (R 1996 – Reinstated 2011) Factory-Made Butt-Welding Fittings for Class I Nuclear Piping Applications Diaphragm Valves Guidelines for Manual Operation of Valves MSS Valve User Guide Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components – Liquid Penetrant Examination Method Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Ultrasonic Examination Method Swage(d) Nipples and Bull Plugs Guidelines on Terminology for Valves and Fittings Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Buttwelding Ends Protective Coatings for the Interior of Valves, Hydrants, and Fittings Instrument Valves Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves (R 2001) Part-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics (R 2001) Multi-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics Wrought Copper Solder-Joint Pressure Fittings Instrument Valves for Code Applications Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150, and 300 Resilient-Seated Cast Iron Eccentric Plug Valves Weld-Fabricated Copper Solder-Joint Pressure Fittings (incl. 2012 Errata Sheet) Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends (incl. 2010 Errata Sheet) Gray-Iron and Ductile-Iron Tapping Sleeves Quality Standard for Evaluation of Cast Surface Finishes – Visual and Tactile Method. This SP must be used with a 10-surface, three dimensional Cast Surface Comparator, which is a necessary part of the standard. Additional Comparators available separately. Connecting Joints between Tapping Machines and Tapping Valves Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000 (ANSI-approved American National Standard) Excess Flow Valves, 1¼ NPS and Smaller, for Fuel Gas Service Service-Line Valves and Fittings for Drinking Water Systems Bellows Seals for Globe and Gate Valves Factory-Made Wrought Belled End Pipe Fittings for Socket-Welding Flexible Graphite Packing System for Rising Stem Valves – Design Requirements Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves Plastic Industrial Ball Valves Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube Fabricated Tapping Sleeves Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves In-Line, Spring-Assisted, Center-Guided Check Valves (Carbon, Alloy Steel, Stainless Steel, & Nickel Alloys) Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application Ductile Iron Gate Valves (R 2007) Copper-Nickel Socket-Welding Fittings and Unions Bellows Seals for Instrument Valves Metallic Manually Operated Gas Distribution Valves Compression Packing Systems for Instrument Valves Excess Flow Valves for Low Pressure Fuel Gas Appliances Valves for Cryogenic Service, including Requirements for Body/Bonnet Extensions High Pressure Knife Gate Valves Ductile Iron Swing Check Valves Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components Quality Standard Practice for Oxygen Cleaning of Valves & Fittings Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications Quality Standard Practice for Preparation of Valves and Fittings for Silicone-Free Service Multi-Turn and Check Valve Modifications Excess Flow Valves for Fuel Gas Service, NPS 1½ through 12 Live-Loaded Valve Stem Packing Systems Pressure Seal Bonnet Valves Metal Ball Valves for Low Pressure/Low Temperature Plumbing Applications

(R YEAR) Indicates year reaffirmed • Price List Available Upon Request • MSS is an ANSI-accredited American National Standards developer

Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.

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127 Park Street, NE, Vienna, VA 22180-4620 • (703) 281-6613 • Fax # (703) 281-6671


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MSS SP-81

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