Specification for cast iron detachable joints for use with asbestos cement pressure pipes — IS 8794 (1988) Testing

IS 8794:1988 specifies requirements for cast iron detachable joints used with asbestos cement pressure pipes. The requirements cover construction, material quality, mechanical properties, hydrostatic performance, dimensions, mass, coating and freedom from defects to help ensure suitable performance of the joint assembly.

Testing can include inspection for freedom from defects, tensile strength, Brinell hardness, hydrostatic testing, dimensional and mass verification and coating assessment. BIS identifies these as the possible tests for assessing conformity under the product certification requirements for IS 8794:1988.

The hydrostatic test is one of the specified conformity tests for cast iron detachable joints under IS 8794:1988. It is used to verify the joint's performance under the applicable hydraulic pressure conditions prescribed by the standard and forms part of the testing requirements referenced in the BIS product manual.

Dimensional verification can include the external diameter of the asbestos cement pipe, flange inside diameter, external diameter at the centre, joint thickness, bolt diameter and minimum preferred bolt length. Mass of the joint is also included among the specified checks.

The grey cast iron used for manufacturing the joints is required to conform to the requisite quality and to one of the specified grades covered by IS 210. This material requirement is included in the BIS sampling and certification guidance for IS 8794:1988.

The BIS product manual specifies a sample consisting of one set comprising two flanges and one collar, along with one test piece each for tensile testing and Brinell hardness testing. Applicable grouping and sampling provisions should also be followed during certification testing.

Yes. Coating is included as a specified conformity requirement under IS 8794:1988, and coating assessment is identified in the BIS product manual among the tests that may be conducted for evaluating the product against the standard.

Yes. BIS currently lists IS 8794:1988 as an Active standard. The BIS standards database also records the standard as reaffirmed in 2022 and shows two amendments.