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This standard is essential reading for:
MSS SP-55 (Manufacturers Standardization Society SP-55) is a standard that specifies the requirements and acceptance criteria for metallic gaskets used in pipe flanges, focusing on surface finish, gasket contact width, cladding, and sealing surface characteristics to ensure reliable flange joint sealing.
Before SP-55, inspection of cast surfaces was subjective—what one inspector deemed acceptable, another might reject. This led to disputes, delays, and potential safety risks.
MSS SP-55 solves this by:
