This revision of this British Standard has been prepared under the direction of the Welding Standards Committee. It embodies the technical developments that have taken place since the 1973 edition which is withdrawn.
The relevant application standard, where it exists, should specify whether class I welding of pipework is required, but the factors to be taken into account in coming to such a conclusion are the operating conditions of the pipework, the degree of inspection and the acceptance requirements (see also appendix Al.
It is further recommended that carbon steels with a carbon content exceeding 0.26 % and all ferritic alloy steels, be welded in accordance with this standard irrespective of the operating conditions.
Purchasers ordering to this standard are advised to specify in their contracts that the manufacturer operates a quality system in compliance with the appropriate Part of BS EN ISO 9000 to assure themselves that pipework claimed to have been welded in accordance with SS 2633 consistently achieves the required level of quality.
The following are companion standards to this standard.
BS 1821 Specification for class I oxy-acetylene welding of ferritic steel pipework for carrying fluids
BS 2640 Specification for class II oxy-acetylene welding of carbon steel pipework for carrying fluids
BS 2971 Specification for class 11 arc welding of carbon steel pipework for carrying fluids
BS 4204 Specification for flash welding of steel tubes for pressure applications
BS 4677 Specification for arc welding of austenitic stainless steel pipework for carrying fluids
Insprcting authority. For the purposes of this British Standard the term 'inspecting authority' refers to that competent independent body or association which verifies compliance with this standard.
Contracting parties. For the purposes of this British Standard, the term 'contracting parties' is intended to cover the purchaser. the manufacturer and the inspecting authority in any relevant combination according to the particular circumstances.
Pipe and tube. For the purposes of this British Standard the word 'pipe', alone or in combination, is used to mean 'pipe' or 'tube', although these terms are often used for different categories of product by different industries.
Pipe dimensions. Unless otherwise qualified, for the purposes of this British Standard 'pipe diameter' relates to the nominal value of the outside diameter and 'pipe thickness' relates to the nominal value of the wall thickness specified in the standard to which the pipe is ordered.
At the time of publication of this British Standard, no corresponding international standard exists. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to
appropriately qualified and experienced people.
