BS 1640-3(1968) : 1968

Co-operating organizations
Foreword
Specification
1 General
1.1 Scope
1.2 Size and size identification
1.3 Pressure ratings
1.4 Materials
1.5 Manufacture
1.6 Heat treatment
2 Dimensions and tolerances
2.1 Dimensions
2.2 Tolerances
3 Workmanship, marking, inspection, testing and
      certification
3.1 Workmanship and finish
3.2 Marking
3.3 Inspection
3.4 Test facilities
3.5 Prototype bursting tests
3.6 Radiographic examination of fittings fabricated by
      fusion welding
3.7 Radiographic technique and acceptance limits
3.8 Impact testing
3.9 Hydrostatic testing
3.10 Certificate
Appendix
A Information to be supplied by the purchaser
Tables
1 Materials and material identification symbols
2 Tolerances
3 Outside diameter and nominal wall thickness of
      steel pipe
4 Dimensions of elbows and return bends
5 Dimensions of 90 deg long radius tangent elbows
6 Dimensions of equal tees
7 Dimensions of reducing tees
8 Dimensions of reducers (concentric and eccentric)
9 Dimensions of caps
10 Dimensions of lap-joint stub-ends
Figures
1 Welding end for wall thicknesses from 4.8 mm to
      22 mm inclusive
2 Welding end for wall thicknesses greater than
      22 mm
3 Typical examples of off-square tolerance 'X'
      checked against reference planes

Gives requirements for wrought seamless and fabricated carbon and ferritic alloy steel butt welding pipe fittings for petroleum industry and is in metric units. The following types of fittings are covered: 45 degree long radius elbows, 90 degree long and short radius elbows, 90 degree long radius tangent elbows, long and short radius return bends, equal and reducing tees, concentric and eccentric reducers, caps and lap joint stub ends. Excludes welding neck flanges which are covered in BS 1560 and BS 3293. Also lists information to be supplied by purchaser.