ISO Petroleum and natural gas industries - Pipeline transportation systems - Welding of pipelines ISO specifies requirements, for the petroleum, petrochemical and natural gas industries, for producing and inspecting girth, branch and fillet welds in the pipeline part of pipeline transportation systems which meet the requirements of ISO or equivalent. ISO is applicable to the requirements for welding of carbon and low-alloy steel pipes, and includes guidance for the welding of corrosion-resistant alloy CRA and CRA-clad pipelines in Annex A. Application is restricted to pipes with a diameter of 20 mm or more and a wall thickness of 3 mm or more, a specified minimum yield strength of MPa or less, and which are designed not to exceed permissible equivalent stresses as defined in ISO or equivalent. Guidance for special welding applications is provided in: Annex B for hyperbaric welding; Annex C for brazing and aluminothermic welding of anode leads; Annex D for branch and fillet welding on in-service pipelines.
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ISO 13847:2000/Cor 1:2001