Code of practice for welding on steel pipes containing process fluids or their residuals
Code of practice for welding on steel pipes containing process fluids or their residuals
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What is BS 6990 - Code of practice for welding about?
BS 6990 covers operations relating to and involving arc welding on ferritic steel and austenitic stainless steel land or offshore pipelines and process plant pipework which contains or has contained a process fluid and which is at least 5 mm thick. BS 6990 gives details of procedures prior to, during and after all these operations. BS 6990 covers manual, semi-automatic and mechanized arc welding by the following processes or combination of processes:
Manual metal-arc welding; MIG/MAG welding TIG welding Flux-cored arc welding Non-shielded welding
It is essential to fully document and follow the items listed in clause 3. Note 1: Welding on pipes of thickness below 5 mm is not covered by BS 6990 although it can be undertaken. Note 2: The titles of the publications referred to in BS 6990 are listed on the inside back cover. Note 3: Welding operations needing post-weld heat treatment for adequate weld quality are not within the scope of BS 6990 . Note 4:
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