Do you know BS 1965-1 standard? It relates to butt-welding pipe fittings for pressure purposes. It covers: 90° and 45° elbows, 180° return bends,concentric and eccentric reducers,equal tees and caps. Welding neck flanges are not included, but they are provided for in BS 10.
Unless otherwise agreed, fittings to this standard shall be made of materials complying with one of the standards below:
- BS 3602 Grade 410 seamless or ERW tubes.
- BS 1501 151-430 (A or B) or 161-430 (A or B) plate
- BS 1503 221-430 or 430E forgings
The maximum service pressure rating of pipe fitting to this standard shall be the same as that for a straight pipe of the same or equivalent material and the same nominal size and thickness.
Fittings on which the final forming operation is completed at a temperature in the range 620℃ (1150℉) to 980℃ (1800℉)need not be heat treated provided they are cooled in still air. Fittings completed at temperatures below 620℃ (1150℉) shall be stress relieved at a temperature of from 580℃ (1075℉) to 620℃ (1150℉).
There are only two kinds of thickness for fittings,medium and heavy. Its tolerance on thickness of fittings at any point shall be not less than 87.5% of the specified thickness.
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