Abstract： ASME B16.21:2011 pdf download.Nonmetallic Flat Gaskets for Pipe Flanges. 2.1 Relevant Units This Standard states values both in SI (metric) and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in...

ASME B16.21:2011 pdf download.Nonmetallic Flat Gaskets for Pipe Flanges.

2.1 Relevant Units

This Standard states values both in SI (metric) 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 as standard. Within the text, the US.

Customary units are shown in parentheses or in separate tables. The values stated in each system 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 constitWes nonconformance with the Standard.

2.2 Quality Systems

Requirements relating to the product manufacturers’ quality system programs are described in Nonmandatory Appendix A.

2.3 References

Standards and specifications adopted by reference in this tandard are shown in Mand.itorv Appendix II.

2.4 flanged joints

A flanged joint is composed of separate and independent, although interrelated, components: the flanges, gasket. and bolting. which are assembled by another influence, the assembler. Proper controls must be exercised in the selection and application for all these elements to attain a joint that has acceptable leak tightness. Additional guidelines (or flange assembly can be found in ASME PCC-l (see Nonmandatory Appendix B).

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