1、MSS SP-6-2017 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and 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: (7
2、03) 281-6613 Fax: (703) 281-6671 E-mail: standardsmsshq.org www.msshq.org MSS STANDARD PRACTICE SP-6i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 102 (primary), 110, 201, and the MSS Coordinating Committee. The content of this Standard Practice is the
3、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 the manufacturer, the user, and
4、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 documents such as a code, specificati
5、on, 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 to MSS and is solely the respon
6、sibility 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 of this MSS Standard Practice (
7、see Annex A). 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 to the validity of any potentia
8、l 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 responsibility. In this Standard Practice, a
9、ll 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 construed as “supplemental”. Note
10、 that supplemental information does not include mandatory requirements. The U.S. customary units and SI (metric) 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
11、in non-conformance with this Standard Practice. Substantive changes in this 2017 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 d
12、imensions 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-6-2017 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Indust
13、ry. 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 Approved: December 1929 Originally Publi
14、shed: January 1930 Current Edition Approved: January 2017 Current Edition Published: March 2017 MSS is a registered trademark of the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2017 by Manufacturers Standardization Society of the Valve and Fittings Indu
15、stry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-6ii TABLE OF CONTENTS SECTION PAGE 1 SCOPE . 1 2 DEFINITIONS . 1 3 REQUIREMENTS . 1 4 LIMITATIONS 1 TABLE 1 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings . 3 FIGURE 1 Types of Contact Faces
16、for Flanges 2 ANNEX A Referenced Standards and Applicable Dates 4 MSS STANDARD PRACTICE SP-61 STANDARD FINISHES FOR CONTACT FACES OF PIPE FLANGES AND CONNECTING-END FLANGES OF VALVES AND FITTINGS 1. SCOPE 1.1 This Standard Practice pertains to the finish of gasket contact faces of pipe flanges and c
17、onnecting-end flanges of valves and fittings. 1.2 This Standard Practice is intended for applications to products for which ASME B16 Standards do not contain complete facing finish requirements or for which there are no such standards. 2. DEFINITIONS 2.1 Flange Facing Finish The surface finish on th
18、e flange contact face (see Figure 1) that comes in contact with a gasket upon flange assembly. 2.2 Roughness Average The term “Ra” (Roughness average) is expressed in microinches (in) or micrometers (m). 2.3 Other Definitions Other definitions may be found in MSS SP-96. 3. REQUIREMENTS 3.1 The flang
19、e facing finish shall be evaluated by visual comparison with “Ra” standards (see ASME B46.1) and not by instruments having stylus tracers and electronic amplification. The finishes required are given in Table 1. Other finishes may be furnished by agreement between purchaser and manufacturer. 3.2 Dim
20、ensions shown in Table 1 shall not be cause for rejection by depth gage measurement or precision instrument measurements. 4. LIMITATIONS 4.1 Surface finishes listed in Table 1 are not necessarily optimal for all gasket material types. 4.2 On flat faces, serrations need not extend beyond correspondin
21、g raised face diameter. 4.3 Flat face and raised face flanges may be provided with a protective coating in certain industries. If provided with such coating, the surface finish requirements only pertain to the machined surface under the protective coating. MSS STANDARD PRACTICE SP-62 FIGURE 1 Types
22、of Contact Faces for Flanges INFORMATIONAL NOTE: The 7.0 mm and 2.0 mm Raised Face Types above utilize the same contact face as the 0.25 in. and 0.06 in. Raised Face Types, respectively, but are not the result of exact conversion. These “mm” Raised Face Types are aligned with MSS SP-44, ASME B16.5,
23、and ASME B16.47. MSS STANDARD PRACTICE SP-63 NOTES: (a) Unless otherwise specified, the manufacturer may supply either spiral or concentric grooves for serrations. The spiral machining operation is commonly accomplished with the cutting tool having a 0.06 in. (1.5mm) or larger tip radius. For serrat
24、ions, this Standard Practice utilizes centimeters (cm) for the SI (metric) units and not millimeters (mm) due to ease of measurement and ability to more effectively verify without magnification equipment. (b) Unless otherwise specified, the manufacturer may supply either the serrated (commonly accom
25、plished with the cutting tool having a 0.06 in. (1.5 mm) or larger tip radius), or a smooth finish. Contact Face MaterialsBronzeNon-serrated(b): 125 in (3.2 m) Ra max., or Serrated(a):spiral or concentric, 30 to 80 per in. (12 to 31 per cm) Approx. Depth:0.003 to 0.020 in. (0.08to0.51mm) Gray Iron N
26、on-serrated(b):250 in (6.3 m) Ra max., or Serrated(a):spiral, 11 to 50 per in. (5 to 19 per cm) or concentric, 8 or more per in. (4 or more per cm) Approx. Depth:0.003 to 0.020 in. (0.08to0.51mm) Ductile Iron Non-serrated(b):250 in (6.3 m) Ra max., or Serrated(a):spiral or concentric, 11 to 50 per i
27、n. (5 to 19 per cm) Approx. Depth:0.003 to 0.020 in. (0.08to0.51mm) Same as above Non-serrated:63 in (1.6 m) Ra max. Steel Serrated(a):spiral or concentric, 45 to 55 per in. (18 to 21 per cm) recommended The resultant surface finish shall have a 125 to 250 in (3.2 to 6.3 m) Ra.Serrated(a): (as above
28、) or Non-serrated: 125 in (3.2 m) Ra max. Non-serrated:63 in (1.6 m) Ra max. Types of Contact Faces Flat Face 0.06 (116)in. Raised Face 2.0 mm Raised Face 0.25 (14)in. Raised Face 7.0 mm Raised Face Large Male and Female Small Male and Female Large Tongue and Groove Small Tongue and Groove Ring Join
29、t Side Walls of Groove TABLE 1 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and FittingsMSS STANDARD PRACTICE SP-64 ANNEX A Referenced Standards and Applicable Dates This Annex is an integral part of this Standard Practice and is placed after the main text
30、 for convenience. Standard Name Description ASME; ANSI/ASME B46.1-2009 Surface Texture (Surface Roughness, Waviness, and Lay) MSS; ANSI/MSS SP-96-2017 Guidelines on Terminology for Valves and Fittings The following organizations appear in the above list: ANSI American National Standards Institute 25
31、 West 43rdStreet, Fourth Floor New York, NY 10036-7406 ASME American Society of Mechanical Engineers (ASME International) Two Park Avenue New York, NY 10016-5990 MSS Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, VA 22180-4602 MSS STANDARD
32、PRACTICE SP-65 This Page Intentionally Left Blank Manufacturers Standardization Society of the Valve and Fittings Industry MSS STANDARD PRACTICE SP-66 This Page Intentionally Left Blank Manufacturers Standardization Society of the Valve and Fittings Industry Purchase or View a Full Listing of MSS St
33、andards at: http:/msshq.org/Store/PriceList.cfm MSS Standard Practices (SPs) related to or referenced in this publication: ANSI/MSS SP-96 Guidelines on Terminology for Valves and Fittings ANSI/MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions American National Standards Pub
34、lished by MSS, an ANSI-accredited Standards Developer:ANSI/MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and UnionsANSI/MSS SP-44 Steel Pipeline FlangesANSI/MSS SP-55 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for E
35、valuation of Surface IrregularitiesANSI/MSS SP-58 Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and InstallationANSI/MSS SP-96 Guidelines on Terminology for Valves and Fittings ANSI/MSS SP-114 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 1
36、50 and 1000ANSI/MSS SP-134 Valves for Cryogenic Service, including Requirements for Body/Bonnet ExtensionsANSI/MSS SP-135 High Pressure Knife Gate Valves ANSI/MSS SP-138 Quality Standard Practice for Oxygen Cleaning of Valves and FittingsANSI/MSS SP-144 Pressure Seal Bonnet Valves Do not violate cop
37、yright laws All Standard Practices are officially available only from MSS and through our authorized distributors: About MSS The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry,
38、 national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Pipe Fittings, Flanges, Pipe Hangers and Supports, and Associated Seals. Since its establishment in 1924, MSS has been dedicated to developing standards for national and global applications, in cooperat
39、ion with other standardizing bodies and regulatory authorities. For more information on membership and eligibility requirements, visit: http:/msshq.org/Store/Membership.cfm Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE, Vienna, VA 22180-4620 Phone (703) 281-6613 Fax (703) 281-6671 “The Technical Voice of the Industry” MSS-IHS SP-6-2017
