1、 MSS SP-51-2012 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings 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
2、-mail: standardsmss-hq.org www.mss-hq.org MSS MSS STANDARD PRACTICE SP-51 i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 110 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and experienced
3、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 public. The existence of an MSS Sta
4、ndard 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 contract, or public law, as applicabl
5、e. 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 certifier or maker of the state
6、ment. “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 of this MSS Standard Practice (see Annex A). This Standard Practice shall rema
7、in 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 any patent rights in connectio
8、n 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, annexes, tables, figures, and r
9、eferences 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 information does not include
10、 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 non-conformance with this Standard Practice.
11、 Substantive changes in this 2012 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-toleranced dimensions in this Standard Practice are nominal
12、, 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-51-2012 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Indu
13、stry. 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 1949 Current Editio
14、n Approved: August 2011 Current Edition Published: May 2012 MSS is a trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2012 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE
15、SP-51 ii FOREWORD The subject matter of this Standard Practice was formerly a part of MSS SP-42, Corrosion Resistant Cast Flanged Valves, Flanges and Flanged Fittings. MSS SP-42 now covers valves only. The 1978 revision of this Standard Practice was delayed beyond the normal review interval in consi
16、deration of extensive revisions being developed for SP-42. Following publication of the re-written SP-42-1978, in which the flange thickness for most sizes were made the same as those in ANSI B16.5 Class 150, it was determined that a commercial need remained for flanges and flanged fittings of reduc
17、ed weight, and that this standard should continue to serve that need. The committee decided, however, that pressure-temperature ratings should be reduced to limit pressure stresses to levels consistent with those applied in ANSI B16.5 Class 150 flanges. While pressure stresses are generally less sig
18、nificant than bolting and piping stresses in these flanges, the new ratings, in combination with the gasket selection recommended herein, serve to limit the assembly bolting loads required. It is intended that the reduction in ratings should substantially reduce the likelihood of misapplication of t
19、hese flanges and fittings. The 1982 and 1986 revisions of this Standard Practice were required to update the referenced standards list in Section 2. The 1991 revision of this Standard Practice was required to update the referenced standards list and delete the metric equivalents. The 1995 reaffirmed
20、 edition of this Standard Practice was required to update the referenced standards list and reaffirm the document. The 2000 revision of this Standard Practice was required to incorporate standard metric dimensions, include forged and plate materials for flanges, and update referenced standards. The
21、2003 revision of this Standard Practice was made to incorporate larger sizes of flanges and fittings (NPS 14, 16, 18, 20, and 24) to accommodate the needs of the user community. The 2007 revision of this Standard Practice was made to correct some dimensions and to update the referenced standards. Th
22、e 2012 revision of this Standard Practice was made to update the referenced standards (e.g., Section 7 and Annex A), clarify markings in Section 8.1(e), and various editorial and conforming changes. MSS STANDARD PRACTICE SP-51 iii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 STANDARD UNITS . 1 3 PRE
23、SSURE-TEMPERATURE RATINGS . 1 4 MATERIALS . 1 5 DESIGN . 2 6 FITTING TOLERANCES . 2 7 GASKETS 2 8 MARKING . 2 9 TESTS 2 TABLE 1 Pressure-Temperature Ratings (bar and psig) 1 2 Fitting Tolerances 2 3 Class 150LW Corrosion Resistant Flanges (Metric) 3 4 Class 150LW Corrosion Resistant Cast Flanged Fit
24、tings (Metric) 4 5 Class 150LW Corrosion Resistant Flanges (Inch) . 5 6 Class 150LW Corrosion Resistant Cast Flanged Fittings (Inch) . 6 FIGURE 1 Method of Designating Outlets of Reducing Fittings 7 ANNEX A Referenced Standards and Applicable Dates . 8 MSS STANDARD PRACTICE SP-51 1 CLASS 150LW CORRO
25、SION RESISTANT CAST FLANGES AND FLANGED FITTINGS 1. SCOPE 1.1 This Standard Practice establishes a series of cast austenitic stainless steel flanged fittings and austenitic stainless steel flanges of reduced weight with mating dimensions for assembly with ASME B16.5, Class 150 flanges, but identifie
26、d as Class 150LW (Light Weight) and limited to use at reduced pressure-temperature ratings. 2. STANDARD UNITS 2.1 The values stated in either (SI) metric units or U.S. customary units are to be regarded separately as the standard. Within the text, the inch units are shown in parentheses. The values
27、stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the Standard Practice. Class 150 (per ASME B16.5) and NPS are the standard descriptors for Pressure Class and Nomin
28、al Size for both metric and customary products covered under this Standard Practice. DN is shown only for reference purposes. Tables 3 and 4 show flange and fittings dimensional requirements in millimeters. Tables 5 and 6 show the dimensional requirements for inch dimensioned flanges and fittings. 3
29、. PRESSURE-TEMPERATURE RATINGS 3.1 Ratings for flanges and flanged fittings conforming to this Standard Practice are shown in Table 1. TABLE 1 Pressure-Temperature Ratings (bar and psig) Temperature C Pressure Rating (bar) -29 to 38 6.9 50 6.8 100 6.1 150 5.5 200 4.9 260 4.1 Temperature F Pressure R
30、ating (psig) -20 to 100 100 200 90 300 80 400 70 500 60 4. MATERIALS 4.1 Cast flanges and fittings may be made using materials conforming to the following specifications: a) ASTM A351/A351M Gr. CF8 b) ASTM A351/A351M Gr. CF8M c) ASTM A351/A351M Gr. CF8C d) ASTM A351/A351M Gr. CF3 e) ASTM A351/A351M
31、Gr. CF3M f) ASTM A351/A351M Gr. CN7M 4.2 Flanges may also be made from forgings or plates (blind flanges only) conforming to the following specifications: a) ASTM A182/A182M Gr. F304 b) ASTM A182/A182M Gr. F316 c) ASTM A182/A182M Gr. F347 d) ASTM A240/A240M Type 304 e) ASTM A240/A240M Type 316 f) AS
32、TM A240/A240M Type 347 g) ASTM B462 Gr. N08020 h) ASTM B463 Gr. N08020 MSS STANDARD PRACTICE SP-51 2 5. DESIGN 5.1 Flanges shall be flat faced with serrated finish in accordance with MSS SP-6. 5.2 A flange assembly with a flange having a raised face is not recommended. The raised face of the mating
33、flange should be removed. 5.3 Flanges should be spot faced in conformance with MSS SP-9 or back faced, if necessary, to meet maximum tolerance on thickness through bolt holes. 5.3.1 Spot facing or back facing shall not reduce the thickness of a flange below the minimum specified in Table 3 or Table
34、5. 5.4 Pipe threads of threaded flanges shall conform to ASME B1.20.1. Threads shall be concentric with the axis of the flange and variations in alignment shall not exceed 1 mm within 200 mm (116in. per ft.). 5.4.1 Threads shall be countersunk a distance not less than one-half the pitch of the threa
35、d at an angle approximately 45 degrees with the axis of the thread, to provide easy entrance in assembly and for protection of the thread. The chamfer shall be concentric with the thread, and shall be included in measurements of thread length. 5.4.2 Variations in threading shall be limited to one tu
36、rn large or one turn small from the gauging notch when using working gauges. The reference point for gauging is the starting end of the fitting or flange, providing the chamfer does not exceed the major diameter of the internal thread. When a chamfer on the internal thread exceeds this limit, the re
37、ference point becomes the last thread scratch on the chamfer cone. 5.5 Flanged fitting dimensions shall be in conformance with Table 4 or Table 6. 5.5.1 Reducing fittings shall be designated as shown in Figure 1. 6. FITTING TOLERANCES 6.1 Inspection tolerances shall be per Table 2. TABLE 2 Fitting T
38、olerances NPS DN Center-to-Face Face-to-Face mm in. mm in. 1/4 10 12 24 8 250 300 600 1 2 132116 2 3 116187. GASKETS 7.1 Full face gaskets are recommended. CAUTION: Since flanges conforming to this Standard Practice are reduced in thickness as compared with ASME B16.5 Class 150 flanges, proper flang
39、e joint assembly is critically important for satisfactory performance. Gaskets should be selected from ASME B16.5, Appendix B, Table B1, Group Number 1a. 8. MARKING 8.1 Products conforming to this Standard Practice shall be marked as shown in the following example: a) Manufacturers name or trademark
40、 AB Co. b) Class designation 150LW c) Material designation CF8 d) Melt identification 12345 e) Size (NPS, DN, or NPS/DN) 6 8.2 At the option of the manufacturer, products may be marked with the size in DN or NPS/DN. 9. TESTS 9.1 Flanged fittings shall be hydrostatic shell tested at 10.3 bar (150psig
41、). 9.2 Flanges are not required to be pressure tested. MSS STANDARD PRACTICE SP-51 3 TABLE 3 Class 150LW Corrosion Resistant Flanges (Metric) Size d Diameter (Min.)(b)O Flange Diameter Q Flange Thickness (Min.)(a)BC Bolt Circle(d)No. of Bolts Bolt Diameter W Bolt Hole Diameter(c)X Diameter of Hub (M
42、in.) Y Length Overall NPS DN 1/4 8 6 65 7.5 42.9 4 38 71622 10 3/8 10 9 65 7.5 42.9 4 3871622 10 1/2 15 12 90 8 60.3 4 125830 16 3/4 20 19 100 9 69.9 4 125838 16 1 25 25 110 10 79.4 4 125849 17 1 32 31 115 10.5 88.9 4 125859 21 1 40 38 125 11.5 98.4 4 125865 22 2 50 50 150 13 120.7 4 583478 25 2 65
43、63 180 14.5 139.7 4 583490 29 3 80 76 190 16 152.4 4 5834108 30 4 100 101 230 17.5 190.5 8 5834135 33 6 150 152 280 21 241.3 8 3478192 40 8 200 203 345 24 298.5 8 3478246 44 10 250 254 405 25.5 362.0 12 781 305 49 12 300 304 485 27 431.8 12 781 365 56 14 350 336 535 28.5 476.3 12 1 118400 57 16 400
44、387 595 28.5 539.8 16 1 118457 64 18 450 438 635 30.0 577.9 16 1181 505 68 20 500 489 700 33.5 635.0 20 1181 559 73 24 600 590 815 35.0 749.3 20 1 138663 83 Dimensions are in millimeters, except for diameter of bolt and bolt holes, which are in inch units. NOTES: (a) The “Flange Thickness (Min.)“ as
45、 shown in the table is the dimension from the back of the flange-to-gasket contact face. Tolerance on thickness is +2 mm for flanges NPS 1/4 through 1, +3 mm for flanges NPS 1 through 18, and +5 mm for NPS 20 and NPS 24 flanges. (b) Blind flanges are recessed 2 mm with a diameter equal to the inside
46、 diameter of the flanged fitting. (c) When flanges are integral with fittings, holes for bolts shall be drilled to straddle the center line. (d) Flange diameters and drilling templates, NPS 1/2 and larger, correspond to those specified in ASME B16.5, Class 150. MSS STANDARD PRACTICE SP-51 4 TABLE 4
47、Class 150LW Corrosion Resistant Cast Flanged Fittings (Metric) Size d Fitting I.D. (Min.) A Center -to- Face AA Face -to- Face B Center -to- Face C Center -to- Face D Face -to- Face E Center -to- Face F Center -to- Face G Face -to- Face T Min. Wall Thickness of Fitting NPS DN 1/4 8 6 65 127 32 3.97
48、3/8 10 9 65 127 32 3.97 1/2 15 12 76 152 41 3.97 3/4 20 19 83 165 44 3.97 1 25 25 89 178 127 44 191 146 44 4.76 1 32 31 95 191 140 51 203 159 44 4.76 1 40 38 102 203 152 57 229 178 51 5.56 2 50 50 114 229 165 64 267 203 64 127 5.56 2 65 63 127 254 178 76 305 241 64 140 6.35 3 80 76 140 279 197 76 33
49、0 254 76 152 6.35 4 100 101 165 330 229 102 381 305 76 178 6.35 6 150 152 203 406 292 127 457 368 89 229 7.14 8 200 203 229 457 356 140 559 444 114 279 7.94 10 250 254 279 559 419 165 648 521 127 305 8.73 12 300 304 305 610 483 190 762 622 140 356 9.52 14 350 336 356 712 546 190 838 686 152 406 10.4 16 400 387 381 762 610 203 927 762 165 457 11.2 18 450 438 419 838 673 216 991 813 178 483 11.9 20 500 489 457 914 737 241 1092 889 203 508 12.7 24 600 590 559 1118 864 279
