Pipes with spigot and socket joints cast in either metal or sand moulds. Class B, field test pressure 400 ft head of water; Class C, 600 ft head of water; Class D, 800 ft head of water. Standard lengths, internal diameters, hydraulic tests and tests for straightness.
BS 1211:1958 history
0000 BS EN 545:1995
1988BS 4772:1988 Specification for ductile iron pipes and fittings
1958BS 1211:1958 Specification for centrifugally cast (spun) iron pressure pipes for water, gas and sewage