1、 MSS SP-129-2014 Copper-Nickel Socket-Welding, Fittings, and Unions 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: standar
2、dsmss-hq.org www.mss-hq.org MSS STANDARD PRACTICE SP-129i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 201 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and experienced volunteers to prov
3、ide 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 public. The existence of an MSS Standard Practice doe
4、s 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 powe
5、r, 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 indi
6、cated 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 Standard Practice shall remain silent on the val
7、idity 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 sha
8、ll 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, annexes, tables, figures, and references are constru
9、ed 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 information does not include mandatory requiremen
10、ts. U.S. customary units in this Standard Practice are the standard. This Standard Practice has been substantially revised from the previous 2003 (R2007) 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 made
11、 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 MSS SP-129-2014 with permission of the publisher,
12、Manufacturers Standardization Society of the Valves 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 Inc. A
13、ll rights reserved. Originally Approved: December 2002 Originally Published: February 2003 Current Edition Approved: December 2013 Current Edition Published: September 2014 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 201
14、4 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-129ii FOREWORD In 1992 the U.S. Navy undertook the development of a standard for copper-nickel socket-weld fittings that would be used with copper-nickel pipe. This standard
15、 allowed for maximum flexibility in starting material and manufacturing processes: casting, forging, pipe, tube, bar, and plate. This military standard was subsequently issued as Naval Sea Systems Command Drawing 803-6397430. In addition, elements (including couplings, elbows, tailpieces, unions, et
16、c.) of this Standard Practice were developed from Military Specification MIL-F-1183. This MSS Standard Practice was developed towards the recent trend, wherein military procurement activities use commercial material standards. Note that this trend was codified into federal law with the National Tech
17、nology Transfer and Advancement Act (NTTAA) of 1996 (as Amended), which requires that all Federal agencies use applicable privately developed standards, particularly those developed by standards organizations. Further, MSS SP-129 builds on the military standard by adding several common fitting confi
18、gurations with dimensions consistent with the original military standard. This 2014 edition includes revisions to Table 1, along with a reordering and renumbering of Table 1 and 2; revisions to Table 24 and 25 so as to better reflect NAVSEA Drawing 803-6397430; revisions, reordering and renumbering
19、to Section 11 marking requirements; clarification to titles for Table 16 and 17; clarifications and revisions to multiple tables header information; updated Annex A references; and included numerous editorial and formatting updates to the document text and tables, along with other revisions to provi
20、de clarification as warranted. MSS STANDARD PRACTICE SP-129iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE 1 2 REFERENCES 1 3 DEFINITIONS 1 4 PRESSURE-TEMPERATURE RATING . 1 5 FITTING DESIGN 1 6 MANUFACTURER METHOD PROOF-TESTING 2 7 PRODUCTION TESTING 2 8 MATERIALS 3 9 TOLERANCES AND DIMENSIONS 3 10 FINI
21、SH 4 11 MARKING 4 TABLE 1 Service Rating . 1 2 Angularity Tolerance . 4 3 Socket Dimensions and Tolerances . 5 4 Short Radius 90 Elbows and 45 Elbows 6 5 Reducing Short Radius 90 Elbows 7 6 Long Radius 90 Elbows . 8 7 Tees and Crosses . 9 8 Reducing Tees . 10 9 Long-Turn Single-Sweep Tees 13 10 Long
22、-Turn Double-Sweep Tees 14 11 45 Y-Laterals . 15 12 Couplings 16 13 Reducing Couplings 17 14 Caps . 18 15 Pipe Returns 19 16 Socket-Weld x External Pipe Thread Adapters . 20 17 External Plain End x Internal Pipe Thread Adapters . 21 18 Cored and Solid Plugs . 22 19 Inserts 23 20 Union Assemblies 26
23、21 Union Tailpieces . 27 22 Union Threadpieces . 28 23 Union Nuts 29 24 Optional Flat-Washer Gasket 30 25 Gasket Ratings . 31 26 Sampling Plan for Inspection and Test 31 ANNEX A Referenced Standards and Applicable Dates 32 MSS STANDARD PRACTICE SP-1291 1. SCOPE 1.1 This Standard Practice establishes
24、 requirements for copper-nickel socket-welding, fittings and unions, from Nominal Pipe Size (NPS) 1/4 through 12, (or as noted), for use with pipe manufactured to one of the following standards: MIL-T-16420K ASTM B466 ASTM B467 1.2 Fitting types include long-radius elbows, short-radius elbows, 45 el
25、bows, tees, reducing tees, long-turn single-sweep tees, long-turn double-sweep tees, crosses, 45 Y-laterals, couplings, reducing couplings, caps, pipe returns, inserts, adapters, plugs, and unions. 1.3 Fittings manufactured in accordance to this Standard Practice may be produced from castings, forgi
26、ngs, bar, pipe, tube, or plate by forming, machining, or a combination of the two. 1.4 Fittings manufactured in accordance to this Standard Practice may be produced with one or more NPT threaded-end configurations that properly adapt to threaded pipe or the piping component. 2. REFERENCES 2.1 Standa
27、rds and specifications adopted by reference in this Standard Practice are shown in Annex A for convenience of identifying edition number, date, and source of supply. 3. DEFINITIONS 3.1 CuNi is a notation representing copper-nickel alloy. 3.2 Electro-etching is an electro-chemical marking process tha
28、t consists of an electrical-power unit that delivers current to a marking head. The marking head is covered with a pad that has been saturated with any one of several electrolytes formulated for marking various metals. When the marking head touches the fitting, the current and the electrolyte flow t
29、hrough a stencil resulting in the replacement of metallic ions with a metal oxide forming an etched mark. 3.3 Controlled-dot peen is a mechanical process using a carbide stylus to create a controlled depth dot matrix impression on the metal being marked. 3.4 Manufacturers heat-code (lot) identificat
30、ion number traces the starting material to a forming or pipe mill melt(s), a foundry casting-melt, a forging shop forging-lot, or a heat lot identified by the manufacturer. 3.5 Block-pattern fittings are any fittings with an exterior shape that does not conform to the projected configuration shape.
31、NOTE: Additional definitions and abbreviations can be found in MSS SP-96. 4. PRESSURE-TEMPERATURE RATING 4.1 Service ratings are shown in Table 1 of this Standard Practice. TABLE 1 Service Rating NPS Rating Maximum Working Pressure (psi) Maximum Temperature(F) 1/4 through 6 400 WOG 400 200 150 425 O
32、ver 6 250 WOG 250 150 150 425 5. FITTING DESIGN 5.1 Prohibited Designs Block pattern fittings and fabricated fittings, including those made by welding, shall not be permitted. COPPER-NICKEL SOCKET-WELDING, FITTINGS AND UNIONS MSS STANDARD PRACTICE SP-1292 5.2 Waterway Designs The waterway shall be a
33、s cast, formed, or machined in a manner that complies with all of the other requirements of this Standard Practice. 5.3 Reducing Designs Cast, forged, or formed reducing-fittings shall be permitted. Reducing fittings shall not exceed the overall envelope dimensions (as defined by Table 3 and the app
34、ropriate table for the shape fitting) of the associated “full size“ fitting (e.g., a 2 x 112x 3/4 reducing tee shall fit the envelope of the 2 x 2 x 2 full-size tee). 5.3.1 The depth of socket for the reduced end shall be no less than that shown in this Standard Practice for the reduced size. 5.3.2
35、For reducing fittings, the wall thickness at the socket face for the reduced end shall be within the thickness and tolerance specified for the reduced size, in accordance with applicable tables for those fittings. Any wall-thickness transitions shall be gradual and smooth in nature. 5.4 Thread Desig
36、n Threaded ends shall be right-hand conforming to ASME B1.20.1. They shall be taper threads (NPT). 6. MANUFACTURER METHOD PROOF-TESTING 6.1 Cast Fittings The validity of each unique foundry method used to make each type and size of cast fitting shall be affirmed by testing in accordance with applica
37、ble sections herein. 6.1.1 Hydrostatic Pressure All cast fitting designs shall be verified by a hydrostatic proof-test of the finished fitting as provided herein. 6.1.1.1 Hydrostatic pressure shall be applied until a pressure of 1,600 psi is reached and maintained for a minimum of 15 seconds. Any le
38、akage during the test shall be cause for rejection of the fitting. 6.1.1.2 Pressure test-results shall be kept on file by the fitting manufacturer and shall be made available to the purchaser upon request. 6.1.2 Retesting A retesting shall be required for any change in the manufacturing method, mate
39、rial, or location, in a way that could affect the pressure containment or fatigue performance of the fitting. 6.1.3 Radiographic Inspection For fittings made from castings, each fitting type, size, material, and casting procedure shall also be verified by radiographic inspection of the finished fitt
40、ing as provided herein. 6.1.3.1 The radiographic procedure shall be done in accordance with NAVSEA Technical Publication T9074-AS-GIB-010/271. Acceptance of the casting will be in accordance with NAVSEA Technical Publication S9074-AR-GIB-010/278, Table XIX, Level 1. 6.1.3.2 Radiographic test-results
41、 shall be kept on file by the fitting manufacturer or foundry and shall be made available to the purchaser upon request. 6.2 Non-Cast Fittings Verification of fittings made from forgings, solid bar, or seamless tube or pipe shall not be required. 6.2.1 Radiographic Inspection Radiographic inspection
42、 shall not be required for fittings made from forgings, solid bar, or seamless tube or pipe, provided certified mechanical and chemical test reports for the heat/lot are on file with the manufacturer and the fittings are manufactured strictly in accordance with the dimensional requirements of this S
43、tandard Practice. 7. PRODUCTION TESTING 7.1 For fittings made from castings, each fitting shall be tested with compressed air at 100 psi for a minimum of 10 seconds. The pressurized fitting shall be submerged in water for the purposes of leak detection. Any leakage during the test shall be cause for
44、 rejection of the fitting. 7.1.1 For fittings made from castings, a random-sample group of each fitting lot shall be hydrostatically tested at 150% of the maximum working pressure for one (1) minute. Any leakage during the test shall be cause for rejection of the lot. 7.1.2 The size of the random sa
45、mple shall be determined in accordance with Table 26. MSS STANDARD PRACTICE SP-1293 7.1.3 For fittings made from castings, a random-sample group of each fitting lot in accordance with Table 26, shall be dimensionally and visually inspected (see Section 10). 7.1.4 If the results of any of the above t
46、est(s) do not meet the requirements of these production tests, the test(s) shall be conducted again only by agreement between the purchaser and the seller. Under such agreement, minimum requirements shall not be changed or modified, nor shall specification limits be revised. If, upon retest, failure
47、 occurs, the quantity of the product represented by the sample size shall not meet the requirements and shall be rejected. 7.1.5 For fittings made from castings, a specimen from each heat shall be subjected to a weldability test in accordance with ASTM B369. The test specimen shall meet the requirem
48、ents of this weldability test, and the test results shall be documented and made available to the customer upon request. 7.2 No air testing, hydrostatic testing, or weldability testing is required for fittings made from forgings, solid bar, plate, or seamless tube or pipe, provided certified mechani
49、cal and chemical test reports for the heat/lot are on file with the manufacturer, and the fittings are manufactured strictly in accordance with the dimensional requirements of this Standard Practice. 7.2.1 For fittings made from forging, solid bar, plate, or seamless tube or pipe, a random-sample group of each fitting lot, in accordance with Table 26, shall be dimensionally and visually inspected (see Section 10). 8. MATERIALS 8.1 Cast fittings and unions shall conform to ASTM B369, including Supplementary Requirements for Copper UNS Number C96400 (70
