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ASME B16.1-2010

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ASME B16.1-2010

Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
American Society of Mechanical Engineers / 07-Jan-2011 / 70 pages
SCOPE
This Standard covers Classes 25, 125, and 250 Gray Iron Pipe Flanges and Flanged Fittings. It includes
(a) pressure–temperature ratings
(b) sizes and method of designating openings of reducing fittings
(c) marking
(d) materials
(e) dimensions and tolerances
(f) bolting and gaskets
(g) pressure testing
GENERAL
2.1 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix II,which is part of this Standard. It is not considered practical
to identify the specific edition of each referenced standard and specification in the text, when referenced.Instead, the specific editions of the referenced standards and specifications are listed in Mandatory Appendix II.
2.2 Quality Systems
Requirements relating to the product manufacturer’s Quality System Programs are described in Nonmandatory Appendix A.
2.3 Relevant Units
This Standard states values in both SI and U.S.Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units only. These systems of units are to be regarded separately. Within the text, theU.S. Customary units are shown in parenthesis or in separate tables. The values stated in each table are not exact equivalents; therefore it is required that each system of units be used independently of the other.Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the standard.

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