1、ANSI/MSS SP-44-2016 Steel Pipeline Flanges 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: standardsmsshq.org www.msshq.org
2、 MSS STANDARD PRACTICE SP-44i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 110 and the MSS Coordinating Committee. In addition, this Standard Practice was approved by an ANSI/MSS Consensus Committee and ANSI as an American National Standard. The content
3、 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 b
4、y 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 doc
5、uments 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 attributab
6、le 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 approv
7、al of this MSS Standard Practice (see Annex E). 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 respe
8、ct 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 responsibi
9、lity. 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
10、 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 and may not be technically equivalent; each should be used independently of the o
11、ther. Combining or converting values or tolerances between the two systems may result in non-conformance with this Standard Practice. This Standard Practice has been substantially revised from the previous 2010 edition. It is suggested that if the user is interested in knowing what changes have been
12、 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 permission. Credit lines should read Extracte
13、d from ANSI/MSS SP-44-2016 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 Stand
14、ardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved/Published: July 1952 Originally ANSI Approved: December 2014 Current ANSI/MSS Edition Approved by MSS: June 2016 Current ANSI/MSS Edition Approved by ANSI: November 2016 Current ANSI/MSS Edition Publi
15、shed: November 2016 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2016 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-44ii FOREWORD The Manufact
16、urers 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 charac
17、terized 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 was originally NPS 26 through NPS 36 in pressure classes customarily designated in ANSI Standard B16.5 as 300, 4
18、00, 600, and 900 lb. The 1970 edition deleted the slip-on flanges for lack of demand, and 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
19、,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
20、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 b
21、lind 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 previ
22、ous 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
23、 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, 40
24、0, 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
25、 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 d
26、ocument 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 an
27、d 450 F, the rating of the valve may not be as high as the flange. The 1990 revision of this SP was required to update the referenced standards list and delete the SI (metric) equivalents. The 1991 revision of this SP was required to add blind flange machining guidance, flat face requirements and pr
28、ecautionary 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
29、 been changed where necessary to conform to ASME B16.5 and 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
30、, which adopted MSS SP-44 dimensions but does not cover the 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 Co
31、nsensus 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, ANSI-approved and published in 2015, is substantively consistent with the 2010 MSS-only edition and will
32、 utilize this 2010 year in its nomenclature. In 2016, this Standard Practice was substantially revised and reformatted to include: Defined chemistry limits (added a Table 1 and also removed external references), clarified the “lot” definition, made impact testing at -50 F mandatory for grades over F
33、42, added requirement for hardness testing, clarified allowable heat treatment methods, changed marking requirements, added tolerances for raised face height and bolt hole diameter, added requirements for Manufacturing Procedure Specification and Inspection and Test Plans, added Figure 4 to illustra
34、te test locations and orientation, removed ring gasket dimensions and referenced ASME B16.20, added Supplementary Requirements SR1 through SR16, updated and renumbered the reference annex, among other substantive and editorial revisions. Moreover, the 2016 edition was ANSI-approved as a Revised Amer
35、ican National Standard. MSS STANDARD PRACTICE SP-44iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE 1 2 DENOTATION 1 3 MATERIALS . 2 4 HEAT TREATMENT 6 5 FLANGE DESIGN . 7 6 MARKING . 8 7 FACINGS . 8 8 CODE LIMITATIONS 9 9 FLANGE BOLTING DIMENSIONS 9 10 TOLERANCES 9 11 MANUFACTURING AND INSPECTION . 11 TA
36、BLE 1 Chemistry Limits (Percentage) 4 2 Tensile Requirements SI (Metric) and U.S. Customary . 4 3 List of Bolting Specifications . 5 4 Pressure-Temperature Ratings, Maximum Allowable Working Pressures SI (Metric) and U.S. Customary . 6 5 Sheet Gasket Dimensions SI (Metric) . 15 6 Class 150, 19.6 bar
37、 at Atmospheric Temperature Raised Face SI (Metric) 17 7 Class 300, 51.0 bar at Atmospheric Temperature Raised Face and Ring-Type Joints SI (Metric) . 19 8 Class 400, 68.3 bar at Atmospheric Temperature Raised Face and Ring-Type Joints SI (Metric) 21 9 Class 600, 102.1 bar at Atmospheric Temperature
38、 Raised Face and Ring-Type Joints SI (Metric) 23 10 Class 900, 153.1 bar at Atmospheric Temperature Raised Face and Ring-Type Joints SI (Metric) 25 11 Permissible Imperfections in Flange Facing Finish SI (Metric) and U.S. Customary . 26 FIGURE 1 Acceptable Design for Unequal Wall Thickness . 12 2 Be
39、vel Detail for Wall Thickness (T), 22mm (0.88 in.) or Less . 13 3 Bevel Detail for Wall Thickness (T), Greater than 22mm (0.88 in.) . 13 4 Recommended Test Location and Orientation . 14 5 Reference Drawing for Table 6 16 6 Reference Drawing for Table 7 18 7 Reference Drawing for Table 8 20 8 Referen
40、ce Drawing for Table 9 22 9 Reference Drawing for Table 10 24 ANNEX A Design Criteria 28 B Blind Flange Design Criteria 29 C Dimensional Data Tables and Drawings for Gaskets and Classes 150, 300, 400, 600, and 900 Flanges in U.S. Customary Units . 30 Table C1 Sheet Gasket Dimensions . 31 Figure C1 R
41、eference Drawing for Table C2 32 Table C2 Class 150, 285 psi at Atmospheric Temperature Raised Faces . 33 Figure C2 Reference Drawing for Table C3 34 Table C3 Class 300, 740 psi at Atmospheric Temperature Raised Face and Ring Joints . 35 Figure C3 Reference Drawing for Table C4 36 Table C4 Class 400
42、, 990 psi at Atmospheric Temperature Raised Face and Ring Joints . 37 Figure C4 Reference Drawing for Table C5 38 Table C5 Class 600, 1480 psi at Atmospheric Temperature Raised Face and Ring Joints . 39 Figure C5 Reference Drawing for Table C6 40 Table C6 Class 900, 2220 psi at Atmospheric Temperatu
43、re Raised Face and Ring Joints . 41 D Supplementary Requirements . 42 E Referenced Standards and Applicable Dates 43 MSS STANDARD PRACTICE SP-44iv This Page Intentionally Left Blank Manufacturers Standardization Society of the Valve and Fittings Industry MSS STANDARD PRACTICE SP-441 STEEL PIPELINE F
44、LANGES 1. SCOPE 1.1 General This Standard Practice covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipeline flanges. The welding neck type flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel pl
45、ate. 1.1.1 Dimensional and tolerance requirements for NPS 10 and smaller are provided by reference to ASME B16.5. When such flanges are produced from materials meeting Table 2 requirements, and meet all other stipulations of this Standard Practice, then they shall be considered as complying therewit
46、h. 1.2 References 1.2.1 Referenced Standards Standards and specifications adopted by reference in this Standard Practice are shown in Annex E, for convenience of identifying edition number, date, and source of supply. A flange made in conformance with a prior edition of referenced standards and in a
47、ll other respects conforming to this Standard Practice, will be considered to be in conformance even though the edition reference may have been changed in a subsequent revision of this Standard Practice. 1.2.2 Codes and Regulations A flange used under the jurisdiction of the ASME Boiler and Pressure
48、 Vessel Code, the ANSI-approved Code for Pressure Piping, or Governmental Regulations, is subject to any limitation of that code or regulation. This includes any maximum temperature limitation for a material, or rule governing the use of a material at a low temperature. 1.3 Relevant Units This Stand
49、ard Practice states values in both SI (metric) and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units (U.S. Customary) only. These systems of units are to be regarded separately as the standard and cannot be combined. Within the text, the U.S. Customary units are shown in parentheses, combined tables, or in separate tables. The values and tolerances stated in each system are not exact equivalents; therefore, it is required that each system of units be used independ
