Specifies the dimensions, tolerances, material and general requirements for metallic spiral wound gaskets for use in flange joints having flat or raised faces.
1.1 The gaskets specified are for use with flanges of the following classes in nominal pipe sizes 10 mm to 600 mm and broadly classified under six different pressure ratings:
a) For pressures up to and including 1 MPa* — Class 10
b) For pressures above 1 MPa to 2 MPa —Class 20
c) For pressures above 2 MPa to 4 MPa — Class 40
d) For pressures above 4 MPa to 6 MPa —Class 60
e) For pressures above 6 MPa to 10 MPa —Class 100
f) For pressures above 10 MPa to 17·5 MPa —Class 175
1.2 Appendix A contains alternate gasket and centering ring sizes to suit pipes and flanges to DIN specifications for information only.
IS 7719-1975 history
1975IS 7719-1975 Specification for metal spiral wound gaskets