Significance and Use

The gaskets covered by this practice can be used on, but are not limited to, equipment constructed of the following materials: ( a ) stoneware, ( b ) glass and glass-lined, ( c ) tantalum (solid and lined), ( d ) titanium (solid and lined or clad), ( e ) zirconium (solid and lined or clad), ( f ) silver (solid and lined), and ( g ) nickel and nickel alloys (solid and clad).

The gaskets provided for herein are for the following: ( a ) pipe flanges (flat or raised face), ( b ) vessel nozzles, ( c ) circular openings in vessels in excess of 12 in. (305 mm) diameter, and ( d ) oval openings in vessels.

1. Scope

1.1 This practice covers the designs, sizes, classifications, and construction of enveloped gaskets for severe corrosive applications. The envelope serves as the corrosion resistant member of the composite gasket and is a nonmetallic material such as polytetrafluoroethylene, PTFE, or related materials. The inserts are nonmetallic gasketing materials with or without metal reinforcement. Other types of composite gaskets are covered in Classification F 868 .

1.2 This standard is based directly upon ANSI B16.21 1992; for that reason units are as ANSI stated in inches.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D3294 Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes

D3308 Specification for PTFE Resin Skived Tape

F104 Classification System for Nonmetallic Gasket Materials

F112 Test Method for Sealability of Enveloped Gaskets

F868 Classification for Laminated Composite Gasket Materials

Other Document

Keywords

corrosive service; enveloped; gaskets; nonmetallic; polytetrafluoroethylene (PTFE); Building design and construction; Classification; Corrosive service applications--gaskets; Gaskets (enveloped); Nonmetallic materials;

ICS Code

ICS Number Code 21.140 (Seals, glands)

DOI: 10.1520/F0336-02R09

ASTM International is a member of CrossRef.

ASTM F336