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TitleMSS SP-25_2008
File Size188.5 KB
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Document Text Contents
Page 1

MSS SP-25-2008

Standard Practice
Developed and Approved by the
Manufacturer’s Standardization Society of the
Valve and Fittings Industry, Inc.
127 Park Street, NE
Vienna, Virginia 22180
Phone: (703) 281-6613
Fax: (703) 281-6671
E-mail: [email protected]

www.mss-hq.org

Standard Marking System
for

Valves, Fittings, Flanges,
and Unions

Provided by IHS
No reproduction or networking permitted without license from IHS

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Page 2

MSS STANDARD PRACTICE SP-25

i

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 302 and the MSS
Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent and concerned
volunteers to provide an effective, clear, and non-exclusive specification that will benefit the industry as a whole.
This MSS Standard Practice 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 is established only by reference in a code,
specification, sales contract, or public law, as applicable.

Unless otherwise specifically noted in this MSS SP, any standard referred to herein is identified by the date of issue
that was applicable to the referenced standard(s) at the date of issue of this MSS SP (See Annex A).

U.S. customary units in this Standard Practice are the standard; the metric units are for reference only.

Substantive changes in this 2008 edition are “flagged” by parallel bars as shown on the
margins of this paragraph. The specific details of the changes may be determined by
comparing the material flagged with that in the previous edition.

Any part of this Standard Practice may be quoted. Credit lines should read ‘Extracted from MSS SP-25, 2008
with permission of the publisher, the Manufacturer’s Standardization Society.' Reproduction prohibited under
copyright convention unless written permission is granted by the Manufacturer’s Standardization Society of
the Valve and Fittings Industry Inc.

Originally Approved July, 1934

Copyright ©, 2008 by
Manufacturer’s Standardization Society

of the
Valve and Fittings Industry, Inc.

Printed in U.S.A.

Provided by IHS
No reproduction or networking permitted without license from IHS

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Page 13

MSS STANDARD PRACTICE SP-25

9

(Example)
Manufacturer’s name or trademark . . . . . . AB CO
Conformance to ASME B16.5 . . . . . . . . . . . . . B16
Material designation . . . . . . . . . . . . . . . . . . . .WCB
Rating designation. . . . . . . . . . . . . . . . . . . . . . . 150
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Melt identification (See Section 6). . . . . . . . . . 000

12.7.5 An NPS 6 Class 1500 forged alloy steel
(ASTM A 182 Grade F1) flange with ring-joint
flange facing, conforming to ASME B16.5
dimensions.

(Example)
Manufacturer’s name or trademark . . . . . . AB CO
Conformance to ASME B16.5. . . . . . . . . . . . . B16
Material designation . . . . . . . . . . . . . . . . A 182 F1
Rating designation . . . . . . . . . . . . . . . . . . . . . 1500
Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Ring joint number. . . . . . . . . . . . . . . . . . . . . . . R46
Melt identification (See Section 6). . . . . . . . . . .000

12.7.6 An NPS 3 carbon steel, 2000 psi
rated flanged union for ambient temperatures or
carbon steel, 6000 psi rated flanged union for
ambient temperatures.

(Example)
Manufacturer’s name or trademark. . . . . . . AB CO
Material designation . . . . . . . . . . . . . . . . . . STEEL

Rating designation appropriate
to pressure class . . . . .2000 CWP or 6000 CWP
Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

13. MARKING REQUIREMENTS FOR
THREADED FITTINGS AND UNION
NUTS

13.1 Threaded Gray Iron Fittings Markings shall
be as follows (See Section 11 for permissible
omission of markings):

a) Manufacturer’s name or trademark

b) Rating designation, with the exception
that rating description is not required on
Class 125 gray iron fittings or gray iron
drainage fittings.

c) Materials markings are not required on
gray iron threaded fittings except that
alloy cast threaded fittings shall be
marked with a word or symbol that will
properly identify the material. The
manufacturer’s own symbol may be used
provided confusion with standard symbol is
avoided.

13.1.1 Gray Iron, Class 125 (ASME B16.4) or gray
iron drainage (ASME B16.12)

(Example)
Manufacturer’s name or trademark. . . . . . . . AB CO

13.1.2 Gray Iron, Class 250 (ASME B16.4)
(Example)

Manufacturer’s name or trademark. . . . . . . . AB CO
Rating design . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

13.2 Bronze and Brass Threaded Fittings and
Union Nuts Markings shall be as follows (See
Section 11 for permissible omission of markings):

a) Manufacturer’s name or trademark

b) Rating designation. Rating designation is not
required on Class 125 cast bronze threaded
fittings. Class 250 fittings will be marked
"250".

c) Size, when part has space

13.2.1 Bronze, Class 125 (ASME B16.15)
(Example)

Manufacturer’s name or trademark. . . . . . . . AB CO

13.2.2 Bronze, Class 250 (ASME B16.15)
(Example)

Manufacturer’s name or trademark. . . . . . . . AB CO
Rating designation. . . . . . . . . . . . . . . . . . . . . . . .250

13.2.3 Brass or bronze, Class 125 union, or brass or
bronze, Class 250 union.

(Example)
Manufacturer’s name or trademark. . . . . . . . AB CO
Rating designation (Class 250 only). . . . . . . . . . 250

13.2.4 An NPS 3 Brass or Bronze, Class 300 union
(Example)

Manufacturer’s name or trademark . . . AB CO
Rating designation . . . . . . . . . . . . . . . . . . . . . . . 300
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Provided by IHS
No reproduction or networking permitted without license from IHS

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Page 14

MSS STANDARD PRACTICE SP-25

10

13.5 Malleable Iron Threaded Fittings and
Threaded Unions Markings shall be as follows
(See Section 11 for permissible omission of
markings):

a) Manufacturer’s name or trademark

b) Material designation. Class 150 malleable
iron threaded fitting and Classes 150, 250
and 300 malleable iron threaded unions
do not require material marking.

c) Rating designation. Classes 150, 250, and
300 malleable iron unions and Class 300
malleable iron threaded fittings shall be
marked with their respective numerals to
designate their nominal rating. At the
manufacturer’s option, the numerals
designating the cold working pressure
supplemented by the letters "CWP", may be
added.

d) Size. Size markings are not required on
Class 150 malleable iron threaded fittings.

13.5.1 Malleable Iron, ASME B16.3 Class
150 fitting
(Example)
Manufacturer’s name or trademark . . . . AB CO

13.5.2 Malleable Iron, ASME B16.3 Class
300 fitting, NPS 1-1/2
(Example)
Manufacturer’s name or trademark . . . . AB CO
Material designation . . . . . . . . . . . . . . . . . . . . . . .MI
Rating designation. . . . . . . . . . . . . . . . . . . . . . . .300
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1/2

13.5.3 Malleable Iron, Class 150, 250, and 300
(ASME B16.39) union, NPS 2
(Example)
Manufacturer’s name or trademark. . . . . . . . AB CO
Service designation appropriate to pressure
class. . . . . . . . . . . . . . . . . . . . . . . . . . 150, 250, or 300
Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

13.3 Non-Ferrous Alloys Threaded Fittings
Markings other than for brass or bronze fittings
shall be marked as follows (See Section 11 for
permissible omission of markings):

a) Manufacturer’s name or trademark

b) Rating designation

c) Material designation

Ni-Cu 505 fitting to ASME B16.15, Class 250
dimensions:

(Example)
Manufacturer’s name or trademark. . . AB CO
Rating designation. . . . . . . . . . . . . . . . . . . . . . . 250
Material designation. . . . . . . . . . . . . . . . Monel 505

13.4 Ductile Iron Class 300 Threaded Fittings and
Threaded Unions Markings shall be as follows
(See Section 11 for permissible omission of
markings):

a) Manufacturer’s name or trademark

b) Material designation. When shape and
size permits, ductile iron nuts shall be
marked with the word "Ductile". When size
and shape restrictions do not permit
marking of the complete word, the letters
"DI" shall be substituted.

c) Rating designation. Class 300 ductile
iron threaded fittings and threaded
union nuts shall be marked with the
numerals "300" designating the nominal
service rating. When heavier patterns are
used to cast ductile iron fittings rated
otherwise, they shall be marked with the
numerals designating the maximum cold
working pressure in psi supplemented by
the letters "CWP".

13.4.1 Ductile iron, Class 300 threaded fitting or
threaded union nut.

(Example)
Manufacturer’s name or trademark . . . AB CO
Material designation . . . . . . . . .DUCTILE or DI
Service designation . . . . . . . . . . . . . . . . . . . . 300

Provided by IHS
No reproduction or networking permitted without license from IHS

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Page 26

MSS STANDARD PRACTICE SP-25

22

ANNEX A

Referenced Standards and Applicable Dates
(continued)

MSS
SP-43-1991 (R 2001) Wrought Stainless Steel Butt-Welding Fittings
SP-44-2006 Steel Pipeline Flanges
SP-75-2004 Specification for High-Test, Wrought Butt-Welding Fittings
SP-83-2006 Class 3000 Steel Pipe Unions Socket Welding and Threaded
SP-104-2003 Wrought Copper Solder Joint Pressure Fittings
SP-114-2001 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000

Publications of the following organizations appear in the above list:

ANSI American National Standards Institute, Inc.
25 West 43rd Street
4th Floor
New York, NY 10035

API American Petroleum Institute
1220 L Street, NW
Washington, DC 20005

ASME ASME International
Three Park Avenue
New York, NY 10016-5990

ASTM ASTM International
100 Bar Harbor Drive
West Conshohoken, PA 19428-2959

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

Provided by IHS
No reproduction or networking permitted without license from IHS

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Page 27

List of MSS Standard Practices
(Price List Available Upon Request)

Number
SP-6-2007 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
SP-9-2008 Spot Facing for Bronze, Iron and Steel Flanges
SP-25-2008 Standard Marking System for Valves, Fittings, Flanges and Unions
SP-42-2004 Class 150 Corrosion Resistant Gate, Glove, Angle and Check Valves with Flanged and Butt Weld Ends
SP-43-2008 Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
SP-44-2006 Steel Pipeline Flanges
SP-45-2003 (R 08) Bypass and Drain Connections
SP-51-2007 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
SP-53-1999 (R 07) Quality Standard for Steel Castings and Forgings for Valves, Flanges and Fittings and Other Piping Components - Magnetic Particle
Examination Method
SP-54-1999 (R 07) Quality Standard for Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Radiographic Examination Method
SP-55-2006 Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components - Visual Method for Evaluation of
Surface Irregularities
SP-58-2002 Pipe Hangers and Supports - Materials, Design and Manufacture
SP-60-2004 Connecting Flange Joint Between Tapping Sleeves and Tapping Valves
SP-61-2003 Pressure Testing of Steel Valves
SP-65-2008 High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
SP-67-2002a Butterfly Valves
SP-68-1997 (R 04) High Pressure Butterfly Valves with Offset Design
SP-69-2003 Pipe Hangers and Supports - Selection and Application (ANSI/MSS Edition)
SP-70-2006 Gray Iron Gate Valves, Flanged and Threaded Ends
SP-71-2005 Gray Iron Swing Check Valves, Flanged and Threaded Ends
SP-72-1999 Ball Valves with Flanged or Butt-welding Ends for General Service
SP-75-2004 Specification for High Test Wrought Butt Welding Fittings
SP-77-1995 (R 00) Guidelines for Pipe Support Contractual Relationships
SP-78-2005a Gray Iron Plug Valves, Flanged and Threaded Ends
SP-79-2004 Socket-Welding Reducer Inserts
SP-80-2008 Bronze Gate, Globe, Angle and Check Valves
SP-81-2006a Stainless Steel, Bonnetless, Flanged, Knife Gate Valves
SP-83-2006 Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
SP-85-2002 Gray Iron Globe & Angle Valves, Flanged and Threaded Ends
SP-86-2002 Guidelines for Metric Data in Standards for Valves, Flanges, Fittings and Actuators
SP-88-1993 (R 01) Diaphragm Valves
SP-89-2003 Pipe Hangers and Supports - Fabrication and Installation Practices
SP-90-2000 Guidelines on Terminology for Pipe Hangers and Supports
SP-91-1992 (R 96) Guidelines for Manual Operation of Valves
SP-92-1999 MSS Valve User Guide
SP-93-1999 (R 04) Quality Standard for Steel Castings and Forgings for Valves, Flanges, and Fittings and Other Piping Components - Liquid Penetrant
Examination Method
SP-94-1999 (R 04) Quality Std for Ferritic and Martensitic Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Ultrasonic
Examination Method
SP-95-2006 Swage(d) Nipples and Bull Plugs
SP-96-2001 (R 05) Guidelines on Terminology for Valves and Fittings
SP-97-2006 Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded and Buttwelding Ends
SP-98-2001 (R 05) Protective Coatings for the Interior of Valves, Hydrants, and Fittings
SP-99-1994 (R 05) Instrument Valves
SP-100-2002 Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves
SP-101-1989 (R 01) Part-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics
SP-102-1989 (R 01) Multi-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics
SP-104-2003 Wrought Copper Solder Joint Pressure Fittings
SP-105-1996 (R 05) Instrument Valves for Code Applications
SP-106-2003 Cast Copper Alloy Flanges and Flanged Fittings, Class 125, 150 and 300
SP-108-2002 Resilient-Seated Cast-Iron Eccentric Plug Valves
SP-109-1997 (R 06) Welded Fabricated Copper Solder Joint Pressure Fittings
SP-110-1996 Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends
SP-111-2001 (R 05) Gray-Iron and Ductile-Iron Tapping Sleeves
SP-112-1999 (R 04) Quality Standard for Evaluation of Cast Surface Finishes -Visual and Tactile Method. This SP must be sold with a 10-surface, three
Dimensional Cast Surface Comparator, which is a necessary part of the Standard. Additional Comparators may be sold separately.
SP-113-2001 (R 07) Connecting Joint between Tapping Machines and Tapping Valves
SP-114-2007 Corrosion Resistant Pipe Fittings Threaded and Socket Welding, Class 150 and 1000
SP-115-2006 Excess Flow Valves, 1 1/4 NPS and Smaller, for Fuel Gas Service
SP-116-2003 Service Line Valves and Fittings for Drinking Water Systems
SP-117-2006 Bellows Seals for Globe and Gate Valves
SP-118-2007 Compact Steel Globe & Check Valves - Flanged, Flangeless, Threaded & Welding Ends (Chemical & Petroleum Refinery Service)
SP-119-2003 Factory-Made Belled End Socket Welding Fittings
SP-120-2006 Flexible Graphite Packing System for Rising Stem Steel Valves (Design Requirements)
SP-121-2006 Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves
SP-122-2005 Plastic Industrial Ball Valves
SP-123-1998 (R 06) Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube
SP-124-2001 Fabricated Tapping Sleeves
SP-125-2000 Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
SP-126-2007 Steel In-Line Spring-Assisted Center Guided Check Valves
SP-127-2001 Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
SP-128-2006 Ductile Iron Gate Valves
SP-129-2003 (R 07) Copper-Nickel Socket-Welding Fittings and Unions
SP-130-2003 Bellows Seals for Instrument Valves
SP-131-2004 Metallic Manually Operated Gas Distribution Valves
SP-132-2004 Compression Packing Systems for Instrument Valves
SP-133-2005 Excess Flow Valves for Low Pressure Fuel Gas Appliances
SP-134-2006a Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions
SP-135-2006 High Pressure Steel Knife Gate Valves
SP-136-2007 Ductile Iron Swing Check Valves
SP-137-2007 Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components
(R-YEAR) Indicates year standard reaffirmed without substantive changes

A large number of former MSS Practices have been approved by the ANSI or ANSI Standards, published by others. In order to maintain a single source
of authoritative information, the MSS withdraws its Standard Practices in such cases.

Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
127 Park Street, N.E., Vienna, VA 22180-4620 (703) 281-6613 • Fax # (703) 281-6671

MSS-IHS SP
Provided by IHS
No reproduction or networking permitted without license from IHS

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