MSS SP-165-2025 大直径滑套式和对焊环松套法兰

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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-165

2025 Edition

Large Diameter Slip-On

and Lap-Joint Flanges

MSS SP-165-2025

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

Flanged 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 D). 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 in this Standard Practice are regarded separately as the standard and

may not be technically equivalent; each should be used independently of the other. Combining or converting values or

tolerances between the two systems of measurement may result in non-conformance with this Standard Practice.

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-165-2025 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: August 2025

Originally Published: September 2025

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

MSS SP-165-2025

Foreword

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

continued requests for steel pipe flanges in sizes larger than those covered by ASME Standard B16.5 on Steel Pipe

Flanges and Flanged Fittings.

The size and pressure class are NPS 26 through NPS 60 in pressure classes customarily designated in ASME

Standard B16.47 as Class 150 and Class 300. Section 6 on Flange Design is one of the key features of this Standard

Practice. Drilling corresponds to the MSS SP-44 bolt patterns.

While these flanges are designated by the customary ASME Standard Class 150 and Class 300, their use is almost

entirely confined to atmospheric temperatures. The flanges have been designed primarily for use at their cold

ratings which conform to the ASME Standard B16.47 ratings of 38 °C (100 °F), however out of recognition of the

successful experience of the pipeline industry, ambient temperature ratings are extended to 121 °C (250 °F).

Users are cautioned that when these flanges are used at temperatures between 38 °C (100 °F) and 232 °C (450

°F), the rating of the valve may not be as high as the flange.

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标签： #法兰 #MS

摘要：

本页面详细介绍 MSS SP-165-2025 标准规范，涵盖大直径滑套式及对焊环松套法兰的设计、尺寸、材料与制造要求。该标准由美国阀门及管件工业制造商标准化协会发布，适用于石油、化工、电力及船舶等领域的管道系统连接。内容重点解析滑套式法兰与对焊环松套法兰的结构区别、密封性能、安装要点及与公称压力等级的匹配关系。通过对比国内外相近标准，帮助工程师准确选型，确保管道系统在高温高压或腐蚀性工况下的安全性与可靠性。页面同时提供标准文本的查询索引与技术参数表，是管道设计与采购人员的重要参考资源。

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MSS SP-165-2025 大直径滑套式和对焊环松套法兰

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