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See Chinese contents: GB/T 3091-2008 GB/T 3091-2008: Welded steel pipes for low pressure liquid delivery
This standard specifies the dimension, appearance, weight, technical requirements, test method, test rules, packing, marking, and quality certificate of welded steel pipes for low pressure liquid delivery. This standard is applicable to welded steel pipes for delivering low pressure liquid such as water, air, heating steam, and gasses. This standard comprises longitudinal-seam high-frequency electrical resistance welded (ERW) steel pipes, longitudinal-seam submerged arc we2ded (SAWL) steel pipe, and spiral-seam submerged arc welded (SAWH) steel pipe. And it denotes the different requirements to each of them respectively. Those without marks are simultaneously applicable to longitudinal-seam high-frequency electrical resistance welded steel pipe, longitudinal-seam submerged arc welded steel pipe, and spiral seam submerged arc welded steel pipe.
