BS 1640-4:1968被替代
Specification for steel butt-welding pipe fittings for the petroleum industry. Wrought and cast austenitic chromium-nickel steel fittings. Metric units
出版：British Standards Institution
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Dimensions and tolerances, materials, methods of manufacture, pressure/temperature ratings, marking, inspection, tests for seamless and fabricated fittings: 45° long radius elbows, 90° long and short radius elbows, 90° long radius tangent elbows, long and short radius return bends, equal and reducing tees, concentric and eccentric reducers, caps and lap-joint stub ends, of sizes 19 mm to 609.5 mm. Welding-neck flanges not included.
? British Standards Institution 2013
General notes:
BS 1640-4 is no longer used in the UK and fittings are now purchased using ASME B16.9 or BS 1965.
