1、 MSS SP-43-2013 Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications 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)
2、281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org www.mss-hq.org MSS MSS STANDARD PRACTICE SP-43 i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 113 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts
3、 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 the manufacturer, the user, and the general publi
4、c. 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 contrac
5、t, 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 c
6、ertifier or maker of the statement. “Unless indicated otherwise within this MSS Standard Practice, other standards documents referred 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 A). This
7、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 an
8、y 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. In this Standard Practice all text, notes, anne
9、xes, 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 construed as “supplemental“. Note that “supplemental”
10、 information does not include mandatory requirements. Substantive changes in this 2013 edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change may be determined by comparing the material flagged with that in the previous edition. Non-tolera
11、nced 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 MSS SP-43-2013 with permission of the publisher, Manufacturers Standardization Society of the Valves and Fitting
12、s 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 Inc. All rights reserved. Originally Published: October 1950 Current
13、Edition Approved: June 2012/Updated March 2013 Current Edition Published: March 2013 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright 2013 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printe
14、d in U.S.A. 127 Park Street, NE Vienna, VA 22180-4602 703-281-6613 FAX 703-281-6671 www.mss-hq.org e-mail: infomsshq.org EXECUTIVE DIRECTOR: Robert F. ONeill September 1, 2015 AMMENDMENT FOR MSS SP-43-2013 (Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applicatio
15、ns) This “normative” amendment applies to MSS SP-43-2013 edition. NOTE THE FOLLOWING AMMENDMENTS: Page 1, Section 3 (Pressure Ratings). Replace the existing Section 3 with the following: 3. PRESSURE RATINGS3.1 Fittings covered by this Standard Practice are primarily intended for corrosion resistant
16、applications; however, they shall have a pressure rating equal to 30% of the allowable pressure rating for comparable straight seamless pipe of the same wall and grade of material as marked on the fittings, whose ratings are determined by the applicable ASME B31 Code for Pressure Piping. 3.2 For fit
17、tings that are of the same pressure rating as the matching pipe, refer to ASME B16.9. Page 10, Annex A (ASME listing). Insert “ASME B31 Code for Pressure Piping” into listing as a normative reference. This Amendment has been inserted into the Standard Practice. For those who obtained the Standard Pr
18、actice before the September 1, 2015 amendment publication date indicated above or otherwise do not already have this information, please include this Amendment Sheet within your existing 2013 edition of the Standard Practice. Future editions of this Standard Practice will include this amended inform
19、ation. PRESIDENT: M.A. Clark NIBCO, Inc. VICE PRESIDENTS: F.J. Washburn Rotork Controls, Inc. J. Barker DeZURIK APCO Hilton, Inc. TREASURER: G.M. Johnson United Valve “The Technical Voice of the Industry” Manufacturers Standardization Society of the Valve And Fittings Industry, Inc. MSS STANDARD PRA
20、CTICE SP-43 ii FOREWORD ASME B16.9 is the American Standard for steel butt-welding fittings and although not so stated, it is implied that its scope deals primarily with the schedules of wall thicknesses which are common to carbon steel and the grades of alloy steel piping that are selected for pres
21、sure and temperature considerations. The rapid expansion of the process industries in the field of chemicals, plastics, textiles, etc., has created a demand for a class of pipe referred to as stainless piping, using this word in its generic sense. This field employs the use of the austenitic stainle
22、ss steels and also nickel and its related alloys. This stainless piping is used with resistance to corrosion, elimination of product contamination, or combination of the two as the principle reason for material selection. Pressure is seldom, if ever, a critical consideration. When pressure is a cons
23、ideration, reference is made to ASME B16.9. Mechanical strength, resistance to vacuum, and economy, are the most usual criteria in the selection of pipe thickness in this field, and for this reason the wall thicknesses employed in the field of corrosion resistant pipe are lighter than those in commo
24、n usage with carbon steel piping. In 1949, the American Standards Association, now known as the American National Standards Institute or ANSI, approved B36.19, Stainless Steel Pipe, as an American Standard. The B36.19 standard was developed by the B36 Standards Committee, which included MSS as a par
25、ticipant. In this American Standard, a schedule of wall thickness was established and designated as Schedule 10S. Numerous companies were also using a wall thickness lighter than Schedule 10S for services where contamination rather than corrosion was the prime consideration. These lighter wall thick
26、nesses were designated Schedule 5S and the original 1950 edition of MSS SP-43 established a series of Schedule 5S fittings. The 5S thicknesses were published in SP-43 and were developed in cooperation with representatives of the various principal chemical companies and processing industries. In 1952
27、, the B36.19 Stainless Steel Pipe Standard was revised to recognize the Schedule 5S wall thickness pipe as an American Standard. MSS and the ASA endorsed this inclusion. The purpose of this Standard Practice is to provide industry with a set of dimensional standards for butt-welding fittings that ca
28、n be used with these light wall pipes of corrosion resisting materials. The center-to-end dimensions of all fittings are identical with those in ASME B16.9, which give to industry the advantage of uniform design room practice and a maximum utilization of existing die equipment. The only departure fr
29、om this is in the lap-joint stub end, where for purposes of economy, the face-to-end of the product has been reduced for use with thin wall piping. The advantage of longer center-to-end dimensions of size 3/4 elbows resulted in a change to the tables that would permit a gradual changeover; thus prov
30、iding manufacturers ample time to deplete existing stock, re-tool, and replenish their stock. The 1991 revision of SP-43 involved the deletion of metric equivalents. The 2001 Reaffirmation had no technical changes. There were minor editorial changes. The precedence of the longer dimensions for 3/4 e
31、lbows was made in accordance with ASME B16.9. Referenced standards were brought up to date. The title of 180 degree returns was clarified. In the 2008 edition, a minimal pressure rating was established to correspond with the ASTM CR designation. The 2013 edition was revised to include a new section
32、on welding, a revision of Table 1 to include angularity tolerances, a revision of Section 6.1 to update AISI/SAE fitting grade types, data corrections were made to Tables 4, 5, and 6, referenced standards in Annex A were updated, and numerous formatting and editorial corrections were made. In additi
33、on, the drawings for Section 10 and 11, and Tables 2, 3, and 5 have been redone in this current revision although not “flagged” given there were no substantive changes. Note that various Table corrections contained within an Errata Sheet issued in 2010 were also incorporated. MSS STANDARD PRACTICE S
34、P-43 iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 REFERENCES 1 3 PRESSURE RATINGS . 1 4 SIZE . 1 5 MARKING 1 6 MATERIALS 1 7 METAL THICKNESS . 1 8 FITTINGS DIMENSIONS 2 9 TESTS . 2 10 TOLERANCES . 2 11 WELDING BEVEL . 2 12 FINISH AND HEAT TREATMENT 2 13 WELDING . 2 TABLE 1 Tolerances 3 2 Dimensi
35、ons of Long Radius Elbows . 4 3 Dimensions of Straight and Reducing-on-the-Outlet Tees 5 4 Dimensions of Lap-Joint Stub Ends and Caps . 7 5 Dimensions of Long Radius 180 Degree Returns . 8 6 Dimensions of Concentric and Eccentric Reducers . 9 ANNEX A Referenced Standards and Applicable Dates . 10 MS
36、S STANDARD PRACTICE SP-43 1 WROUGHT AND FABRICATED BUTT-WELDING FITTINGS FOR LOW PRESSURE, CORROSION RESISTANT APPLICATIONS 1. SCOPE 1.1 This Standard Practice provides dimensions, tolerances, and markings for butt-welding fittings for low pressure, corrosion resistant applications. 1.2 This Standar
37、d Practice covers only fittings made for use with Schedule 5S or 10S pipe, for all Nominal Pipe Sizes (NPS) listed in ASME B36.19M, except that short pattern stub ends suitable for use with Schedule 40S are also shown. 2. REFERENCES 2.1 External standards incorporated by reference in this Standard P
38、ractice are shown in Annex A for convenience of identifying edition number, date, and source of supply. 3. PRESSURE RATINGS 3.1 Fittings covered by this Standard Practice are not pressure rated; however, they must be capable of withstanding 30% of the allowable pressure rating of the pipe with which
39、 they are marked. 3.2 For fittings that are of the same pressure rating as the matching pipe, refer to ASME B16.9. 4. SIZE 4.1 The size of the fittings in Tables 1 through 6 are identified by the corresponding NPS. 5. MARKING 5.1 Each fitting shall be marked as per SP-25 to show the following: a) Ma
40、nufacturers name or trademark b) “CR” followed by the material identification symbol established for the respective grade in the appropriate ASTM specifications or AISI/SAE designations c) Manufacturers heat identification number d) Schedule number or nominal wall thickness designation e) Size 5.2 W
41、here the size of the fittings does not permit complete marking, Sections 5.1 (a) and (c) are mandatory. The other marking and identification marks may be omitted in the sequence, as specified in MSS SP-25. 5.3 The required markings shall be made by any suitable method that is not injurious to the fi
42、tting. 6. MATERIALS 6.1 Fittings made from AISI/SAE Grade Types 304, 304L, 310, 316, 316L, 317, 317L, 321, and 347 are considered standard designations under this Standard Practice. Fittings made from other corrosion resistant material, including nonferrous materials, are acceptable by agreement bet
43、ween the purchaser and the manufacturer provided they meet the requirements of a recognized and applicable AISI/SAE grade designation or ASTM specification. 7. METAL THICKNESS 7.1 As these fittings are to match pipe, the dimensions of the welding ends must conform to established pipe standards, with
44、 regard to outside diameters and tolerances. The nominal wall thickness of the fittings shall be the same as the pipe to which it is welded; except that fittings with heavier walls may be butt-welded to lighter wall pipe, provided the heavier wall is tapered on the inside or outside to match the dim
45、ensions of the lighter pipe. MSS STANDARD PRACTICE SP-43 2 8. FITTINGS DIMENSIONS 8.1 U.S. customary (inch) dimensions for the fittings covered by this Standard Practice are given in Tables 1 through 6. 8.2 One of the principals of this Standard Practice is the maintenance of a fixed position for we
46、lding ends, with reference to the center-line of the fittings or the overall dimensions, as the case may be. 9. TESTS 9.1 Hydrostatic testing of fittings is not required in this Standard Practice; however, fittings shall be capable of withstanding a hydrostatic test pressure that is 1.5 times the pr
47、essure rating required in Section 3.1. 10. TOLERANCES 10.1 Table 1 lists tolerances for the fittings covered by this Standard Practice. The location of dimensions OA and OP are illustrated in the drawing below and actual maximum angularity tolerances indicated in Table 1. 11. WELDING BEVEL 11.1 Fitt
48、ings conforming to this Standard Practice may be finished with ends cut square for wall thickness 0.12 in. or less. For wall thicknesses in excess of 0.12 in., they shall be beveled at 37l2 (+/- 2l2), with root face (land) 0.06 in. (+/- 0.03 in.) as indicated below. 12. FINISH AND HEAT TREATMENT 12.
49、1 The fittings shall be satisfactorily heat treated by an accepted practice, and adequately cleaned to insure maximum corrosion resistance. 13. WELDING 13.1 All fittings shall have welders, welding operators, and welding procedures qualified under the provisions of Section IX of the ASME Boiler and Pressure Vessel Code. MSS STANDARD PRACTICE SP-43 3 AngularityTolerances(Max.)OffAngleOP0.060.060.060.120.250.38GENERALNOTE:Diameterandwallthicknessesare asspecifiedineitherASMEB36.10MorASMEB36.19M.NOTES:(a) Outofroundnessisthevector sumofplusand minustolera
