MSS SP-119-2025 工厂制造锻造钟形端承插焊接管件标准实践

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MSS SPxxx-202x

Standard Practice developed and approved by

the Manufacturers Standardization Society of

the Valve and Fittings Industry, Inc.

The Technical Voice of the Industry ®

441 North Lee Street

Alexandria, Virginia 22314

www.msshq.org

Manufacturers

Standardization Society

OF THE VALVE AND FITTINGS INDUSTRY

PROVIDING INDUSTRY STANDARDS SINCE 1924

MSS SP-119

2025 Edition

Factory-Made Wrought

Belled-End Pipe Fittings

for Socket-Welding

MSS SP-119-2025

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 113, Wrought Welding

Fittings, and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of

knowledgeable and experienced industry 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 industry at large. It is the responsibility of the user of this

Standard Practice to establish appropriate safety and health practices and determine the applicability of regulatory

requirements prior to use. 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.

For all MSS Standard Practices, the term “shall” means “must” and “shall not” means “must not”.

In this Standard Practice, all text, notes, annexes, tables, figures, and references are construed to be “normative”

and essential to understand the standard’s message. All appendices and footnotes, or any other information

denoted as “supplemental”, that may be included within this Standard Practice, DO NOT involve mandatory or

normative requirements.

U.S. customary units in this Standard Practice are the standard; the SI (metric) units are based on common equivalencies

and are for reference only. Combining or converting values between the system of measurement utilized and “reference”

values may result in non-conformance with this Standard Practice.

This Standard Practice has been substantively revised from the previous 2010 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.

Excerpts of this Standard Practice may be quoted with written permission. Credit lines should read ‘Extracted from MSS

SP-119-2024 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

Originally Approved: November 1996

Originally Published: January 1997

Current Edition Approved: August 2024

Current Edition Published: January 2025

MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.

MSS SP-119-2025

Foreword

ASME B16.9 is the American Standard for steel butt-welding fittings and although not so stated, it implied that its

scope dealt primarily with standard (Schedule 40) wall and heavier as it was developed for carbon steel and those

grades of alloy steel piping that are selected for pressure and temperature considerations. In 1949 ASME approved

standard ASME B36.19 for Stainless Steel Pipe in which Schedule 10S was established. Schedule 5S pipe was

recognized in the 1952 publication of ASME B36.19. The companion fittings for Schedule 10S pipe used ASME B16.9

shapes and proportions and were standardized by MSS SP-43, which was first published in 1950. In anticipation, the

original 1950 edition of MSS SP-43 also standardized Schedule 5S fittings.

Since 1950 the use of lighter than standard wall stainless steel piping in new construction has become predominant.

The reasons for this evolution include the rapid expansion of the process industries in the fields of chemicals, plastics,

textiles, paper, etc.

Coincident with the greater utilization of light wall pipe and of more capable metal forming machinery, the need to

reduce pipe assembly fabrication times brought about by world market competition led to the development of belled-

end socket-welding fittings. As with the development of MSS SP-43, the shapes and proportions for ASME B16.9 were

reused for the belled-end fitting bodies to the maximum extent possible.

In 1992 first work on belled-end fittings for this Standard Practice included defining socket proportions, socket to

fitting body transition geometry, fitting thickness, and determining the ability of U.S. industry to support

manufacturing. Some of this work only standardized service proven relationships used in belled-end fittings made

for the pulp and paper industry without standards for over 20 years. In 1994 the U.S. Navy funded burst and fatigue

testing prototype fittings in the first of a two-phase program. The second phase was for an increased thickness fitting

and was never done. In 1995 mid-way through testing, the Navy directed that these belled-end fittings be used on

ship systems in new construction followed shortly thereafter by direction to use them on the repair of ship systems.

The quality and configuration control of these fittings was done by an interim document, the requirements of which,

with some improvements, are contained herein.

In keeping with trends wherein military procurement activities have been using more commercial material

standards and because of recognized fabrication economies related to the use of these fittings, the U.S. Navy

sponsored the writing of the 1996 edition of this Standard Practice in cooperation with fitting manufacturers.

This Standard Practice established dimensional uniformity for light wall belled-end socket-welding fitting designs

qualified by burst and fatigue testing for Military Service and qualified by burst testing for Commercial Code Practice.

The most significant changes in the 2003 revision included the following: 1) A new definition for allowable pressure

ratings for MP fittings (Section 6), which adopts the ASME B16.9 format rating the fitting the same as the connecting

pipe of the same schedule; 2) The addition of titanium and aluminum fitting materials; and 3) The addition of the

Supplementary Requirements (Section 18, now 17), which supports Navy special requirements.

The most significant changes in the 2010 revision included the following: 1) The extension of the SCOPE to include

heavier wall fittings; 2) The relocation of the CR fitting requirements from the body of the Standard Practice to that

of a Supplementary Requirement; 3) The addition of all the combinations of reducing fittings included in ASME B16.9;

and, 4) The addition of a reference line on the socket end to enable inspectors to measure the installation weld length

– as a Supplementary Requirement. The title of the 2010 revised Standard Practice was also amended.

The most significant change in this 2024 revision is the addition of 0.25 in. to the reducing outlet branch length in

reducing branch tees with run sizes of 2, 21⁄2 and 3, which tees are shown in Table 9. This change will enhance

fabrication quality by removing the branch weld from the forming area. The remaining revisions to this Standard

Practice mostly involve maintenance, format updating and editorial or clarifying corrections, rather than substantive

changes, and do not affect form, fit, function, materials, or inventory.

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MSS SP-119-2025 工厂制造锻造钟形端承插焊接管件标准实践

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