1、ANSI/MSS SP-44-2016 (2017 REISSUE) (Replaces Original 2016 Edition) 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) 2
2、81-6671 E-mail: standardsmsshq.org www.msshq.org 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 AN
3、SI as an American National Standard. The content 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
4、and 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 to this Standard Practi
5、ce 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 o
6、f 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
7、 to this Standard Practice at the date of approval 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 St
8、andard 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 infringem
9、ent of such rights are entirely their responsibility. 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 appendice
10、s, if included, that appear in this document are 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 equiva
11、lent; each should be used independently of the other. 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
12、 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 wi
13、th permission. Credit lines should read Extracted from ANSI/MSS SP-44-2016 (2017 Reissue) 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
14、unless written permission is granted by the Manufacturers Standardization 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
15、 Approved by ANSI: November 2016 Current ANSI/MSS Edition Published: November 2016 (Reissued September 2017) MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2016 (2017) by Manufacturers Standardization Society of the Valve a
16、nd Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-44ii 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
17、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 was originally N
18、PS 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 added a 150 lb. Class and coverage for NPS 12 through NPS 24. Additional coverage was also necessitated by the adv
19、ent 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 st
20、eel 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 i
21、s 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
22、 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
23、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 incre
24、ased 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 con
25、form 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 cap
26、able 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
27、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 SP was required to update the referenced standards list and delete the SI (metric) equivalents. The 1991 revisi
28、on of this SP 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 s
29、everal errata, or corrections made to references to other standards. Dimensional tolerances have 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 refe
30、rence 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 SP-44 high strength materials used in the pipeline industry to match API line pipe of equivalent grades. In 2014, this Standard Practice (2010 E
31、dition) 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, ANSI-app
32、roved and published in 2015, is substantively consistent with the 2010 MSS-only edition and will 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 refer
33、ences), clarified the “lot” definition, made impact testing at -50 F mandatory for grades over F42, 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
34、 Manufacturing Procedure Specification and Inspection and Test Plans, added Figure 4 to illustrate 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 sub
35、stantive and editorial revisions. Moreover, the 2016 edition was ANSI-approved as a Revised American National Standard. Note that the original 2016 edition was replaced by the 2017 Reissue of the 2016 Edition to correct publication processing related errata. A separate Errata Sheet was also issued (
36、Sept 2017) for insertion into the original 2016 Edition. MSS STANDARD PRACTICE SP-44iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE 1 2 DENOTATIONS 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 MA
37、NUFACTURING AND INSPECTION . 11 TABLE 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 (
38、Metric) . 15 6 Class 150, 19.6 bar 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, 10
39、2.1 bar at Atmospheric Temperature 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 fo
40、r Unequal Wall Thickness . 12 2 Bevel 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 Referenc
41、e Drawing for Table 8 20 8 Reference 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
42、Gasket Dimensions . 31 Figure C1 Reference 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
43、for Table C4 36 Table C4 Class 400, 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,
44、 2220 psi at Atmospheric Temperature 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 STANDAR
45、D PRACTICE SP-441 STEEL PIPELINE FLANGES 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 ei
46、ther forged steel or from steel plate. 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 b
47、e considered as complying therewith. 1.2 References 1.2.1 Referenced Standards The standards and specifications incorporated 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 pri
48、or edition of referenced standards or specifications and is in all other respects conforming to this Standard Practice, will be considered to be in conformance even though the edition referenced may have changed in a subsequent revision of this Standard Practice. 1.2.2 Codes and Regulations A flange
49、 used under the jurisdiction of the ASME Boiler and Pressure 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 Standard 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.
