MSS SP-44-2026 钢制管道法兰 Steel Pipeline Flanges

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MSS SP-44-2026

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-44

2026 Edition

Steel Pipeline Flanges

Provided by Accuris under license with MSS

Licensee=China National Offshore Oil Co/5965930001, User=shan, shichao

Not for Resale, 03/07/2026 08:38:27 UTC

No reproduction or networking permitted without license from Accuris

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MSS SP-44-2026

This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 110, Steel Flanges &

Flanged Fittings, and the MSS Coordinating Committee. In addition, this Standard Practice was approved by an

ANSI/MSS Consensus Committee and by ANSI as an American National Standard. 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 F). 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.

The SI (Metric) units and U.S. Customary units included within this Standard Practice are regarded separately

as the standard; each should be used independently of the other and may not be technically equivalent.

Combining or converting values between the two systems of measurement may result in non-conformance with

this Standard Practice.

This Standard Practice has been substantively revised from the previous 2019 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 ANSI/MSS

SP-44-2026 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

Originally Published by MSS: July 1952

Originally Approved by ANSI: December 2014

Original ANSI/MSS Edition Published: January 2015

Current Edition Approved by MSS: September 2025

Current ANSI/MSS Edition Approved by ANSI: February 2026

Current ANSI/MSS Edition Published: February 2026

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

Provided by Accuris under license with MSS

Licensee=China National Offshore Oil Co/5965930001, User=shan, shichao

Not for Resale, 03/07/2026 08:38:27 UTC

No reproduction or networking permitted without license from Accuris

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MSS SP-44-2026

Foreword

The Manufacturers Standardization Society originally developed this Standard Practice in response to the continued

requests for steel pipe flanges for pipeline use, particularly in sizes larger than those covered by ANSI Standard B16.5

on Steel Pipe Flanges and Flanged Fittings. The line pipe is uniquely characterized by high-strength, cold worked, thin-

wall of the carbon steel grade, which necessitates special considerations for the welding end of the flanges.

The size and pressure class range were originally NPS 26 through NPS 36 in pressure classes customarily designated

in ANSI Standard B16.5 as 300, 400, 600, and 900 lb.

The 1970 edition deleted the slip-on flanges for lack of demand, and then added a 150 lb Class and coverage for NPS 12

through NPS 24. Additional coverage was also necessitated by the advent of the use of line pipe of grades having

minimum specified yield strength higher than the 52 000 psi maximum contemplated at the time of initial development,

and therefore still thinner walls.

In some instances, this advent widened the differential between the tensile properties of the flange steel versus that of

the mating pipe steel. This, in turn necessitated greater flexibility in the selection of hub dimensions, so that various

combinations of material-strength and flange-dimensions could be utilized to supply the flanges. Section 5 on Flange

Design was introduced at this point and is one of the key features of this Standard Practice.

The 1972 edition included the coverage of blind flanges in all pressure classes and clarification of text requirements

for better understanding and usage under the more diverse conditions.

The 1975 edition expanded the size range above NPS 36. The drilling templates for the Class 150 flanges of the NPS 38

and larger sizes continued the previous philosophy of adopting the drilling template of the Class 125 of ANSI/ASME

Standard B16.1. However, the drilling templates of the Class 300 flanges of the NPS 38 and larger sizes did not continue

the adoption of the Class 250 of ANSI/ASME Standard B16.1 drilling templates, nor did the NPS 38 and larger sizes of

Classes 400, 600, and 900 continue the extrapolation of ANSI/ASME B16.5 drilling templates; instead, these drilling

templates were necessarily designed more compactly because of the increased loads. While these flanges are

designated by the customary ANSI Standard Class 150, 300, 400, 600, and 900, their use is almost entirely confined to

cross country transmission pipelines at atmospheric temperatures. The flanges have been designed primarily for use

at their cold ratings which conform to the ANSI/ASME Standard B16.5 ratings of 100 °F, and are intended primarily for

attachment to relatively thin-wall, high-strength cold worked pipe, and high-strength butt-welding fittings in pipeline

service at temperatures of 450 °F and lower. However, flanges forged of other materials are capable of pressure

temperature ratings as specified in Section 2.1.

The 1981 edition brought the document into closer editorial alignment with ANSI/ASME B16.5. However, out of

recognition of the successful experience of the pipeline industry, room temperature ratings were extended to 250 °F.

Users are cautioned that when these flanges are bolted to valves and used at temperatures between 100 °F and 450 °F,

the rating of the valve may not be as high as the flange.

The 1990 revision of this Standard Practice was required to update the referenced standards list and delete the SI

(metric) equivalents.

The 1991 revision of this Standard Practice was required to add blind flange machining guidance, flat face requirements

and precautionary notes as well as updating of the referenced standards.

The 1996 revision adds a table with permissible imperfections in flange facing finish and clarifies Annex A design

criteria. There were several errata, or corrections made to references to other standards. Dimensional tolerances have

been changed where necessary to conform to ASME B16.5 and ASME B16.47.

The 2006 revision was required to add SI (metric) equivalent units, notch toughness requirement, new bolting

materials and update of reference standards list.

The 2010 revision recognized the existence of ASME B16.47 Series A flanges, which adopted MSS SP -44

dimensions but does not cover the MSS SP-44 high strength materials used in the pipeline industry to match API

line pipe of equivalent grades.

In 2014, this Standard Practice (2010 Edition) was ANSI-approved as an American National Standard. This process

involved an ANSI/MSS Consensus Committee that was composed of a diverse volunteer group of industry

stakeholders with a material interest in the topic of this Standard Practice. This American National Standard edition,

Provided by Accuris under license with MSS

Licensee=China National Offshore Oil Co/5965930001, User=shan, shichao

Not for Resale, 03/07/2026 08:38:27 UTC

No reproduction or networking permitted without license from Accuris

--`,``,,,,,,,,``,`,,`,,````,,-``,,`,,,,-``,,`,,,,---

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标签： #钢 #法兰 #管

摘要：

本页面详细介绍《MSS SP-44-2026 钢制管道法兰》标准规范，涵盖该标准的最新修订内容、适用范围及技术要点。MSS SP-44-2026 是美国阀门及配件工业制造商标准化协会（MSS）发布的最新版钢制管道法兰标准，专为高压、高温及大直径管线系统设计，适用于石油、天然气、化工及能源输送领域。该标准对法兰的材料等级（如A105、A694等）、压力-温度额定值、尺寸公差、螺栓连接及密封面类型（包括RTJ、凸台面等）作出明确规定，并引入了2026年版本中对制造工艺、无损检测及标记要求的更新。本描

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MSS SP-44-2026 钢制管道法兰 Steel Pipeline Flanges

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