Flange Standards
Flange Standards
For process and utilities pipework, the two commonly used flange standards are ANSI B16.5 (American National Standards Institute) and BS 1560 (British Standards). A third standard, API 6A (American Petroleum Institute) specifies flanges for Wellhead and Christmas Tree Equipment.
Flanges of different standards are not normally joined. If necessary to do so, engineering advice must first be sought to ensure the compatibility of the mating flanges.
Reference : BP Amoco Piping Joints Handbook (Document No. D/UTG/054/00)
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