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api 5000PO BOX 639 • Bakersfield, CA 93302 855-535-1555 phone • sales@ API FLANGE BOLT & RING CHART API Pressure Rating Flange Size & BoreAPI 6A TYPE 6B 5000 PSI Blind pipe flanges are used to seal the end of a piping system or pressure vessel openings to prevent flow.API 6A TYPE 6B 5000 PSI Blind flanges are mainly used for pressure testing the flow of liquid or