1、 MSS SP-97-2012 Integrally Reinforced Forged Branch Outlet Fittings Socket Welding, Threaded, and Buttwelding Ends 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: (70
2、3) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org MSS www.mss-hq.org MSS STANDARD PRACTICE SP-97 i This MSS Standard Practice was developed under the consensus of MSS Technical Committees 105 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 otherwise specifically noted in 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 issue of this Standard Practice (see Annex C). This St
7、andard Practice shall remain silent on the applicability 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
8、 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 responsibility. In this Standard Practice, all text, notes,
9、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 construed as “supplemental”. Note that supplement
10、al 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 between the two systems may result in nonconformanc
11、e with this Standard Practice. This Standard Practice has been substantially revised from the previous 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 of this document. Non-toleranced dimensions in the
12、 Standard Practice are nominal, and, unless otherwise specified, shall be considered “for reference only“. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-97-2012 with permission of the publisher, Manufacturers Standardization Society
13、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 Inc. All rights reserved. Originally Publishe
14、d: June 1987 Current Edition Approved: September 2011 Current Edition Published: May 2012 MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2012 by Manufacturers Standardization Society of the Valve and Fittings Industry,
15、Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-97 ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 SERVICE DESIGNATION . 1 3 SIZE . 2 4 MARKING 2 5 MATERIAL . 2 6 DESIGN AND DIMENSION 3 7 TESTS . 3 TABLE 1 Correlation of Fittings Class with Schedule Number or Wall Designation of Run Pipe for Calcula
16、tion of Ratings . 1 2 90 Branch Outlets Buttwelding, U.S. Customary Units 4 3 90 Branch Outlets Threaded, U.S. Customary Units 5 4 90 Branch Outlets Socket Welding, U.S. Customary Units 6 5 45 Branch Outlets Buttwelding, U.S. Customary Units 7 6 45 Branch Outlets Threaded, U.S. Customary Units 8 7 4
17、5 Branch Outlets Socket Welding, U.S. Customary Units 9 A2 90 Branch Outlets Buttwelding, SI (Metric) Units . 10 A3 90 Branch Outlets Threaded, SI (Metric) Units 11 A4 90 Branch Outlets Socket Welding, SI (Metric) Units 12 A5 45 Branch Outlets Buttwelding, SI (Metric) Units . 13 A6 45 Branch Outlets
18、 Threaded, SI (Metric) Units 14 A7 45 Branch Outlets Socket Welding, SI (Metric) Units 15 FIGURE 1 Fitting Consolidation Gap Allowance . 2 ANNEX A SI (Metric) Tables A2 through A7 . 10 B Design Proof Test 16 C Referenced Standards and Applicable Dates . 17 MSS STANDARD PRACTICE SP-97 1 1. SCOPE 1.1
19、This Standard Practice covers essential dimensions, finish, tolerances, testing, marking, material, and minimum strength requirements for 90 and 45 degree integrally reinforced forged branch outlet fittings of buttwelding, socket welding, and threaded types. 1.2 Fittings manufactured to this Standar
20、d Practice are designed to make a fully reinforced branch connection in accordance with applicable piping code requirements, when attached, at an opening in a run pipe by means of a full penetration weld. 1.3 Fittings may be made to special dimensions, size, shape, tolerances, or of other wrought ma
21、terial by agreement between the manufacturer and the purchaser. 1.4 Standard Units Tables 2 through 7 show the fittings dimensional requirements in customary units or inches (decimal). Tables A2 through A7 show the fittings dimensional requirements in SI (metric) units (e.g., millimeters). The value
22、s stated in either customary or SI (metric) units are to be regarded separately as the Standard. Within the body text, the SI (metric) units are shown in parenthesis. Combining values from the two systems may result in non-conformance with the Standard Practice. The values stated in each option are
23、not exact equivalents; therefore, each measurement system must be used independently of the other. 2. SERVICE DESIGNATION 2.1 These fittings are designated by their size, type, and class, as shown in Table 1. 2.2 Design temperature and other service conditions shall be limited as provided by the app
24、licable piping code or regulation for the material of construction of the fitting. Within these limits, the maximum allowable pressure of a fitting shall be that computed for straight seamless run pipe of equivalent material (as shown by comparison of composition and mechanical properties in the res
25、pective material specifications). The wall thickness used in such computation shall be that tabulated in ASME B36.10M for the size and applicable schedule of pipe reduced by applicable manufacturing tolerances and other allowances (e.g., threaded allowances). 2.3 Any corrosion allowance and any vari
26、ation in allowable stress due to temperature or other design factors shall be applied to the pipe and fitting alike. The pipe wall thickness corresponding to each Class of fitting, for rating purposes only, is shown in Table 1. INTEGRALLY REINFORCED FORGED BRANCH OUTLET FITTINGS SOCKET WELDING, THRE
27、ADED, AND BUTTWELDING ENDS TABLE 1 Correlation of Fittings Class with Schedule Number or Wall Designation of Run Pipe for Calculation of Ratings Class of Fitting Type Branch Size Pipe Wall for Rating Basis(a)Standard Extra Strong Schedule 160 3000 6000 Buttwelding Buttwelding Buttwelding Threaded or
28、 the ASTM Forging Specifications A105/A105M, A182/A182M, or A350/A350M. 5.2 All other forging, bar, and seamless tubular products listed in ASME B16.34 Table 1; including the applicable “notes” of ASME B16.34 Table 1, Table 2, or Appendix VII tables, may be used. FIGURE 1 Fitting Consolidation Gap A
29、llowance (Illustrative Only) Applicable to 90 and 45 Branches MSS STANDARD PRACTICE SP-97 3 6. DESIGN AND DIMENSION 6.1 A run pipe having a branch connection is weakened by the opening made in it. The branch connection must reinforce the opening and restore the original strength of the run pipe. It
30、is the intent of this Standard Practice that these integrally reinforced branch outlet fittings and the deposited weld metal used to attach the fittings to run pipes contain all the reinforcement required by the applicable pressure vessel or piping codes without the addition of saddles or pads. 6.1.
31、1 The adequacy of the design of branch connection fittings may be established by mathematical analyses contained in pressure vessel or piping codes, or, at the manufacturers option, by proof testing in accordance with Section 7 and Annex B. Records of design or proof tests shall be available at the
32、manufacturers facility for inspection by the purchaser. 6.1.2 The pressure vessel or piping codes referred to in Section 6.1.1 permit a variety of attachment welds for these fittings. Typical branch attachments are shown in ASME B31.1 and B31.3. 6.1.3 Fittings shall be contoured to provide a good fi
33、t at the opening in the run pipe. The run attachment weld bevel angle design will vary with the size and type of fitting and with the manufacturer. The size of the run opening is dependent on the manufacturers specification. 6.2 Buttwelding Buttwelding end finishes shall comply with the standard wel
34、ding bevel and root face of ASME B16.25. 6.3 Threads Threads in threaded fittings shall comply with ASME B1.20.1 requirements for NPT. 6.3.1 The minimum wall thickness at the root of the thread at the hand tight plane shall be equal to or greater than the nominal wall of the pipe schedule for the ap
35、propriate fitting class, as shown in Table 1. 6.4 Socket Weld Socket Weld fittings shall meet the minimum socket depth, minimum socket wall thickness and socket diameter of ASME B16.11 for the appropriate class. 6.5 The contour weld bevel angle on the longitudinal section of the fittings shall be a
36、minimum of 35 degrees. The weld bevel angle on the transverse section of the fitting is based on the manufacturers specification. 7. TESTS 7.1 Hydrostatic testing of wrought fittings is not required by this Standard Practice. All fittings shall be capable of withstanding, without leakage or impairme
37、nt of serviceability, a pressure equal to that prescribed in the applicable code or regulation for seamless pipe of equivalent material and schedule listed in Table 1. 7.2 Proof testing is not required, but when performed to meet the requirements of Section 6.1.1, the testing shall be conducted in a
38、ccordance with Annex B. MSS STANDARD PRACTICE SP-97 4 TABLE 2 90 Branch Outlets Buttwelding, U.S. Customary Units Dimensions are in inches. Outlet (NPS) A (Face of Fitting to Crotch) Standard Extra Strong Schedule 160 Reducing Full Reducing Full Reducing Full 1/8 0.62 0.62 1/4 0.62 0.62 3/8 0.75 0.7
39、5 1/2 0.75 0.75 0.75 0.75 1.12 1.12 3/4 0.88 0.88 0.88 0.88 1.25 1.25 1 1.06 1.06 1.06 1.06 1.50 1.50 1141.25 1.25 1.25 1.25 1.75 1.75 1121.31 1.31 1.31 1.31 2.00 2.00 2 1.50 1.50 1.50 1.50 2.18 2.18 2121.62 1.62 1.62 1.62 2.44 2.44 3 1.75 1.75 1.75 1.75 2.88 2.88 3121.88 2.00 1.88 2.00 - - 4 2.00 2
40、.00 2.00 2.00 3.31 3.31 5 2.25 2.25 2.25 2.25 3.69 3.69 6 2.38 2.38 3.06 3.06 4.12 4.12 8 2.75 2.75 3.88 3.88 10 3.06 3.06 3.69 3.50 12 3.38 3.38 4.06 3.94 14 3.50 3.50 3.94 4.12 16 3.69 3.69 4.18 4.44 18 3.81 4.06 4.38 4.69 20 4.00 4.62 4.69 5.00 24 4.56 5.38 5.50 5.50 Tolerances: 18 34 .03 in. 1 4
41、 .06 in. 5 12 .12 in. 14 24 .19 in. MSS STANDARD PRACTICE SP-97 5 TABLE 3 90 Branch Outlets Threaded, U.S. Customary Units Dimensions are in inches. Outlet (NPS) A Nom. (Face of Fitting to Crotch) Threaded Class 3000 Class 6000 1/8 0.75 1/4 0.75 3/8 0.81 1/2 1.00 1.25 3/4 1.06 1.44 1 1.31 1.56 114 1
42、.31 1.62 112 1.38 1.69 2 1.50 2.06 212 1.81 3 2.00 4 2.25 Tolerances: 18 34 .03 in. 1 4 .06 in. MSS STANDARD PRACTICE SP-97 6 TABLE 4 90 Branch Outlets Socket Welding, U.S. Customary Units Dimensions are in inches. Outlet (NPS) B Min.(a)C Max. Class 3000 Class 6000 1/8 0.38 0.41 1/4 0.38 0.41 3/8 0.
43、38 0.50 1/2 0.38 0.63 0.94 3/4 0.50 0.63 1.00 1 0.50 0.88 1.13 114 0.50 0.88 1.19 112 0.50 0.94 1.25 2 0.62 0.94 1.44 212 0.62 1.00 3 0.62 1.19 4 0.75 1.19 Note: (a) “B“ Minimum Socket Depth per ASME B16.11 MSS STANDARD PRACTICE SP-97 7 TABLE 5 45 Branch Outlets Buttwelding, U.S. Customary Units Dim
44、ensions are in inches. Outlet (NPS) A (Top of Fitting to Run Pipe) Standard / Extra Strong A Min. A Max. 1/4 1.500 1.688 3/8 1.500 1.688 1/2 1.500 1.688 3/4 1.750 2.000 1 2.125 2.563 114 2.125 2.563 112 2.500 2.750 2 2.875 3.500 MSS STANDARD PRACTICE SP-97 8 TABLE 6 45 Branch Outlets Threaded, U.S.
45、Customary Units Dimensions are in inches. Outlet (NPS) A (Top of Fitting to Run Pipe) Class 3000 A Class 6000 A A Min. A Max. A Min. A Max. 1/4 1.500 1.688 1.531 1.875 3/8 1.500 1.688 1.531 1.875 1/2 1.500 1.750 1.812 2.188 3/4 1.812 2.000 2.125 2.500 1 2.125 2.500 2.406 2.875 114 2.406 3.000 2.563
46、3.062 112 2.500 3.000 3.094 3.375 2 3.000 3.312 3.094 4.125 MSS STANDARD PRACTICE SP-97 9 TABLE 7 45 Branch Outlets Socket Welding, U.S. Customary Units Dimensions are in inches. Outlet (NPS) B Min.(a)A (Top of Fitting to Run Pipe) Class 3000 Class 6000 A Min. A Max. A Min. A Max. 1/4 0.38 1.500 1.6
47、88 1.531 1.875 3/8 0.38 1.500 1.688 1.531 1.875 1/2 0.38 1.500 1.750 1.812 2.188 3/4 0.50 1.812 2.000 2.125 2.500 1 0.50 2.125 2.500 2.406 2.875 114 0.50 2.406 3.000 2.563 3.062 112 0.50 2.500 3.000 3.094 3.375 2 0.62 3.000 3.312 3.094 4.125 Note: (a) “B“ Minimum Socket Depth per ASME B16.11 MSS STA
48、NDARD PRACTICE SP-97 10 ANNEX A SI (Metric) Tables A2 through A7 TABLE A2 90 Branch Outlets Buttwelding, SI (Metric) Units Dimensions are in millimeters. Outlet (DN) Outlet (NPS) A (Face of Fitting to Crotch) Standard Extra Strong Schedule 160 Reducing Full Reducing Full Reducing Full 6 1/8 15.7 15.
49、7 8 1/4 15.7 15.7 10 3/8 19.1 19.1 15 1/2 19.1 19.1 19.1 19.1 28.4 28.4 20 3/4 22.4 22.4 22.4 22.4 31.8 31.8 25 1 26.9 26.9 26.9 26.9 38.1 38.1 32 114 31.8 31.8 31.8 31.8 44.4 44.4 40 112 33.3 33.3 33.3 33.3 50.8 50.8 50 2 38.1 38.1 38.1 38.1 55.4 55.4 65 212 41.1 41.1 41.1 41.1 62.0 62.0 80 3 44.4 44.4 44.4 44.4 73.2 73.2 90 312 47.8 50.8 47.8 50.8 100 4 50
