1、ANSI/MSS SP-44-2010Steel 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 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.orgwww.mss-hq.org MSSM
2、SS STANDARD PRACTICE SP-44 iThis 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 o
3、f 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 by
4、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 docum
5、ents 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
6、 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
7、 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
8、 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 responsibili
9、ty. 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 c
10、onstrued 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; each should be used independently of the other. Combining or converting values bet
11、ween 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 made, that direct page by page comparison should be m
12、ade 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 Extracted from ANSI/MSS SP-44-2010 with permission of the publ
13、isher, 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
14、Inc. All rights reserved. Originally Approved/Published: July 1952 2010 Edition Approved by MSS: October 2009 2010 Edition Published by MSS: March 2010 Current ANSI/MSS Edition Approved by ANSI: December 2014 Current ANSI/MSS Edition Published: January 2015 MSS is a registered trademark of Manufactu
15、rers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2010, 2015 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-44 iiFOREWORDThe Manufacturers Standardization Society originally developed this S
16、tandard 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 c
17、arbon 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, 400, 600, and 900 lb. The 1970 edition deleted the slip-on
18、 flanges for lack of demand, and added a 150 lb. class and coverage for sizes 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 initia
19、l 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 combin
20、ations 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 clarificat
21、ion of text requirements for better understanding and usage under the more diverse conditions. The 1975 edition expanded the size range above size 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 templa
22、te of the Class 125 of ANSI 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 Standard B16.1 drilling templates, nor did the NPS 38 and larger sizes of Classes 400, 600, and 900 continue the
23、extrapolation of ANSI 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 cro
24、ss country transmission pipelines at atmospheric temperatures. The flanges have been designed primarily for use at their cold ratings which conform to the ANSI Standard B16.5 ratings of 1000F, and are intended primarily for attachment to relatively thin-wall, high-strength cold worked pipe, and ,hig
25、h-strength butt-welding fittings in pipeline service at temperatures of 4500F and lower. However, flanges forged of other materials are capable of pressure temperature ratings as specified in Section 2.1. The 1980 edition was created to bring the document into closer editorial alignment with ANSI B1
26、6.5. However, out of recognition of the successful experience of the pipeline industry, room temperature ratings were extended to 2500F. De-rating above 2500F was accelerated such that the 4500F ratings are the same as ANSI B16.5. Users are cautioned that when these flanges are bolted to valves and
27、used at temperatures between 1000F and 4500F, the rating of the valve will not be as high as the flange. The 1990 revision of this SP was required to update the referenced standards list and delete the metric equivalents. The 1991 revision of this SP was required to add blind flange machining guidan
28、ce, flat face requirements and precautionary notes as well as update of 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.
29、Dimensional tolerances have been changed where necessary to conform to ASME B16.5 and B16.47. The 2006 revision was required to add metric equivalent units, notch toughness requirement, new bolting materials and update of reference standards list. This 2010 revision recognized the existence of ASME
30、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 Edition) was ANSI-approved as an American National Standard. This process
31、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-approved and published in 2015, is substantively consistent with the 2010 MS
32、S-only edition and will utilize this 2010 year in its nomenclature. MSS STANDARD PRACTICE SP-44 iiiTABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DENOTATION 1 3 MATERIALS . 2 4 HEAT TREATMENT 5 5 FLANGE DESIGN 6 6 MARKING . 7 7 FACINGS . 8 8 CODE LIMITATIONS 8 9 FLANGE BOLTING DIMENSIONS 8 10 TOLERANC
33、ES 9 TABLE 1 Tensile Requirements (Metric therefore, it is required that each system of units be used independently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the Standard Practice. 2. DENOTATION 2.1 Pressur
34、e-Temperature Ratings 2.1.1 General Flanges covered by this Standard Practice shall be designated as one of the following: Class 150, 300, 400, 600 and 900. Pressure temperature ratings in Table 3 are in metric and U.S. Customary. 2.2 Size NPS, followed by a dimensionless number, is the designation
35、for nominal flange size. NPS is related to the reference nominal diameter, DN, used in international standards. The specific relationship for the NPS size flange to DN size flange in this Standard Practice is as follows: NPS 12 14 16 18 20 22 24 DN 300 350 400 450 500 550 600 NPS 26 28 30 32 34 36 3
36、8 DN 650 700 750 800 850 900 950 NPS 40 42 44 46 48 50 DN 1000 1050 1100 1150 1200 1250 NPS 52 54 56 58 60 DN 1300 1350 1400 1450 1500 STEEL PIPELINE FLANGESMSS STANDARD PRACTICE SP-44 2 3. MATERIALS 3.1 The steel used in the manufacture of these flanges shall be selected by the manufacturer to meet
37、 the following requirements. 3.1.1 All materials used for flanges shall be killed steel. Acceptable forging and plate (blind flanges) materials include the following: Forgings (a) ASTM Specification Plates (a)ASTM Specification A 105 A 350 A 694 A 707 A 515 Grade 70 A 516 Grade 70 A 537 Note (a): Se
38、lected material shall meet the specified grade requirements of Table 1 and other provisions of Section 3. 3.1.2 The steel used shall be suitable for field welding to other flanges, fittings, or pipe manufactured under ASTM specifications A 105, A 53, A 106, A 350, A 381, A 694, A 707, or API Standar
39、d 5L. 3.1.3 The steel used shall have a maximum carbon content of 0.35 and a carbon equivalent computed by the following equation: 1556CuNiVMoCrMnCEC that should not exceed 0.48%, based on ladle analysis. If the carbon equivalent factor exceeds 0.48% the acceptance of the flanges shall be based on a
40、greement between purchaser and manufacturer. 3.1.3.1 The choice and use of alloying elements, combined with the elements within the limits prescribed in Section 3.1.3 to give the required tensile properties prescribed in Section 3.1.4 shall be made by the flange manufacturer and included and reporte
41、d in the ladle analysis to identify the type of steel. 3.1.4 The steel used shall have tensile properties conforming to the requirements prescribed in Table 1 and capable of meeting the requirements of Section 4 and the flange manufacturers design conditions as given in Annex A. 3.1.4.1 The test spe
42、cimens may be taken from the forgings or, at the manufacturers option, from the billets or forging bar entering into the finished product, provided such test blank has undergone relatively the same forming and the equivalent heat treatment as the finished flange. The dimensions of the test blank mus
43、t be such as to adequately reflect the heat treatment properties of the hub of the flange. Specimens shall be obtained from the midwall of the thinnest section of the hub of the flange or 19mm (3/4 in.) from the surface of the test blank. The orientation of specimens taken from a flange shall be lon
44、gitudinal. 3.1.5 When specified in the purchase order, Notch Toughness properties shall be determined with full size Charpy Type A V-notch specimens in accordance with ASTM A 370. Sub size specimens shall be used only when material to be tested is of insufficient thickness. All specimens shall be ta
45、ken with the axis of the specimen longitudinal to the direction of major working and with the notch perpendicular to the surface. For plate, (blind flanges only), specimens may be taken transverse to the direction of rolling. From each sheet of steel, one set (three specimens) shall be tested at a m
46、aximum temperature of -70C (200F) or at the minimum temperature for which the flange pressure temperature rating is listed, typically -290C (-200F) and show 27 J, joule, (20 ft-lb) minimum average. Percent shear shall be reported for informational purposes only. The test specimens shall have receive
47、d the same working and shall be in the same heat treatment as the flanges they represent, when determining the typical notch toughness properties of a given material. MSS STANDARD PRACTICE SP-44 3 3.2 Bolting Bolting listed in Table 2 shall be used in flanged joints covered by this Standard Practice
48、. Bolting of other material may be used if permitted by the applicable code or governmental regulation. All bolting materials are subject to the following limitations. 3.2.1 High Strength Bolting Bolting materials having allowable stresses not less than those for ASTM A193 Gr B7 are listed as high s
49、trength in Table 2. These and other materials of comparable strength may be used in any flanged joint. 3.2.2 Intermediate Strength Bolting Bolting materials listed as intermediate strength in Table 2, and other bolting of comparable strength, may be used in any flanged joint, provided the user verifies their ability to seat the selected gasket and maintain a sealed joint under expected operating conditions. 3.2.3 Low Strength Bolting Bolting materials having not more than 207 MPa (30 ksi) specified minimum yield strength are listed as low strength in Table 2. These mat
