Specifies international requirements for circular copper alloy and composite flanges in nominal pressure designations, PN 10 to PN 50. Types of flanges, their facings, dimensions, tolerances, bolt sizes, flange face surface finish, marking, testing, inspection and materials are specified. Pressure/temperature ratings for flanges of nominated alloys are given. This Standard is identical with and has been reproduced from ISO 7005-3:1988.