Saturday, June 29, 2019

ASME B16.21-2005: Nonmetallic Flat Gaskets for Pipe Flanges

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Before this standard was issued, the individual sizes of gaskets were made to many different sets of dimensions, based on different concepts of adaptation and functional use on the part of consumers as well as manufacturers. In some cases dimensions were shown in American Standards. To standardize gasket sizes, the Standards and Specifications Committee of the Mechanical Packing Association started work on a standard for nonmetallic or cut gaskets for bronze, iron, and steel pipe flanges.

Dimensions of gaskets being used were collected, and a basic design philosophy for sizing was formulated by the committee. This was the result of extensive field research experience and accepted standard user requirements. The procedure followed was to dimension the gasket for each type and size of flange so as to prevent the gasket from projecting into the line of flow. Dimensional tolerances of standard pipe flanges and fittings as to I.D., O.D., and bolting were all considered.

Suggested dimensional standards were tabulated and distributed for industry comment. After several revisions, a final draft, dated September 15, 1948, was approved by the Mechanical Packing Association for submission as an American Standard.

Sectional Committee (B16) on the Standardization of Pipe Flanges and Fittings was organized in 1921 under the procedure of the American Standards Association, with the Heating, Piping, and Air Conditioning Contractors’ National Association, Manufacturers’ Standardization Society of the Valve and Fittings Industry, and the American Society of Mechanical Engineers as joint sponsors.

Committee Roster
Correspondence With the B16 Committee
1. Scope
2. Types and Sizes
3. Materials
4. Dimensions and Tolerances
5. Markings

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