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BS EN 1759-1:2004
Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, class-designated. Steel flanges, NPS 1/2 to 24 (British Standard)
This European Standard specifies dimensions, tolerances, materials, P/T ratings and technical conditions of delivery for steel flanges with bore size DN 15 to DN 600, Class designated; based on ANSI-B 16.5-1988 + Addenda 1992.
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British Standards Institution [bsi]