BS 2971: 1991 Specification for Class II arc welding of carbon steel pipework for carrying fluids

British Standards Institution (BSI).Third edition June 1991. 38 p. This British Standard specifies requirements for both shop and site class II arc welding of joints in carbon steel pipework intended to carry fluids. It covers manual, automatic or semi-automatic arc welding or combinations of these processes, but it also allows joints to be made with an oxy-acetylene root run without a backing ring by agreement between the contracting parties