GB/T 17241.1-1998

This standard provides a synoptic table classifying the types of cast iron pipe flanges, specifying their nominal pressure ratings, dimensions, and facing types. It is applied in the design, manufacturing, and procurement of flanged connections for fluid systems, particularly in water supply, drainage, and industrial piping where cast iron pipes are used. The standard ensures compatibility and interchangeability between flanges and corresponding pipe components in low to medium pressure applications.