This MSS Standard Practice was developed under the connsus of the MSS Technical Committees 102, 110, 201, and the MSS Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective, clear, and non-exclusive specification that will benefit the industry as a whole. This MSS Standard Practice is intended as a basis for common practice by the manufacturer, the ur, and the general public. The existence of an MSS Standard Practice does not in itlf preclude the manufacture, sale, or u of products not conforming to the Standard Practice. Mandatory conformance is established only by reference in a code, specification, sales contract, or public law, as applicable.
Unless otherwi specifically noted in this MSS SP, any standard referred to herein is identified by the date of issue that was applicable to the referenced standard(s) at the date of issue of this MSS SP. (See Annex A.)
U.S. customary units in this SP are the standard; the metric (SI) units are for reference only.
In this Standard Practice all notes, annexes, tables, and figures are construed to be esntial to the understanding of the message of the standard, and are considered part of the text unless noted as "supplemental". All appendices appearing in this document are construed as "supplemental". Supplemental" information does not include mandatory requirements.
Substantive changes in this 2007 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.
Any part of this standard may be quoted. Credit lines should read ‘Extracted from MSS SP-6, 2007 with permission of the publisher, the Manufacturers Standardization Society.' Reproduction prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc.
Originally Approved December, 1929
Copyright ©, 1985 by
大地春雷Manufacturers Standardization Society
of the
Valve and Fittings Industry, Inc.
Printed in U.S.A. --` ` ` ` ` ` ` ` -` -` ` ` ` ` ---
1. SCOPE
1.1 This Standard Practice pertains to the finish of gasket contact faces of pipe flanges and 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.
书法入门2. DEFINITIONS
2.1 Roughness Average The term Ra (Roughness average) is expresd in micro-inches (μin) [micro-meters (μm)]. 2.2 Flange Facing Finish The surface finish on
the flange contact face, e Figure 1, that comes in
到远方
contact with a gasket upon flange asmbly.
3. REQUIREMENTS
3.1 Flange facing finish shall be judged by visual comparison with Ra standards (e 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 purchar and manufacturer. 3.2 Dimensions shown (in Table 1) shall not be cau for rejection by depth gage measurement or precision instrument measurements.
4. LIMITATIONS
4.1 Surface finishes listed are not necessarily
optimum for all gasket types of materials.
4.2 On flat faces, rrations need not extend beyond corresponding raid face diameter.
STANDARD FINISHES FOR CONTACT FACES
OF PIPE FLANGES AND CONNECTING END FLANGES
OF VALVES AND FITTINGS
FIGURE 1 Types of Contact Faces for Flanges
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TABLE 1
Standard Finishes for Contact Faces of Pipe Flanges and
Connecting-End Flanges of Valves and Fittings
Type of Contact Faces
Steel
Ductile Iron
Gray Iron
Bronze
Flat or 1-16” (1.6 mm) Raid Face and
Serrated (a)武汉大学专业
: spiral or concentric, 45 to 55 per inch (18 to 21 per cm) recommended.
The resultant surface finish shall have a 125 to 250 µin (3.2 to 6.3 µm) Ra.
Non-rrated (b)
: 250 µin (6.3 µm) Ra max.,
or
Serrated (a): spiral or concentric, 11 to 50 per in. (5 to 19 per cm). Depth approx. 0.003 to 0.020 in. (0.075 to 0.51 mm)
Non-rrated (b)
: 250 µin (6.3 µm) 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). Depth approx. 0.003 to 0.020 in. (0.075 to 0.51 mm)
Non-rrated (b): 125 µin (3.2 µm) Ra max.,
or
Serrated (a): spiral or concentric, 30 to 80 per in. (12 to 31 cm). Depth approx. 0.003 to 0.020 in. (0.075 to 0.51 mm). 1/4” (6.4 mm) Raid and Large Male & Female
Small Male & Female, Large & Small Tongue & Groove Serrated (as above) (a)
or
Non-rrated: 125 µin. (3.2 µm) Ra max.
Ring Joint – Side Walls of Groove
Non-rrated: 63 µin. (1.6 µm) Ra max.
Non-rrated: 63 µin. (1.6 µm) Ra max.
NOTES:武功山旅游攻略
(a) Unless otherwi specified, the manufacturer may supply either spiral or concentric
grooves for rrations. The spiral machining operation is commonly accomplished with the cutting tool having 0.06 in. (1.6 mm) or larger tip radius.
(b) Unless otherwi specified, the manufacturer may supply either the rrated (commonly
accomplished with the cutting tool having 0.06 in. (1.6 mm) or larger tip radius) or smooth finish.
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ANNEX A
Referenced Standards and Applicable Dates
This annex is an integral part of this Standard Practice and is placed after the main text for convenience.
公平的名言
Standard Name or Description
ASME, ANSI/ASME, ANSI, ASME/ANSI
B46.1 – 1995 Surface Texture (Surface Roughness, Waviness, and Lay)
The following organizations publish the above standard:
一氧化碳的化学性质
ANSI American National Standards Institute 25 West 43rd Street 4th Floor New York NY 10036
ASME ASME International Three Park Avenue New York, NY 10016-5990
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