GB/T 9711-2011: Translated English of Chinese Standard. (GBT 9711-2011, GB/T9711-2011, GBT9711-2011): Petroleum and natural gas industries - Steel pipe for pipeline transportation systems
This Standard specifies requirements for the manufacture of two product specification levels (PSL 1 and PSL 2) of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.
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accordance with Clause accordance with GB/T ASTM chemical composition COW pipes COWL or COWH CVN absorbed energy CVN impact test delivery condition expressed in millimetres fracture ft·lbf given in Table guided-bend test hardness test heat treatment helical seam HFW pipe hoop stress hydrostatic test jointers laminar imperfections laser beam welding lengths of pipe LW pipe maximum megapascals millimetres inches minimum permissible wall niobium non-destructive inspection notches Number Once per test permissible wall thickness pipe ends pipe grade pipe with D PSL 2 pipe purchase order radiographic requirements retesting sample SAW and COW SAW pipe SAWL or SAWH seam weld SMLS pipe specified minimum yield specified outside diameter specified wall thickness Standard steel grade steel pipes strip/plate end weld SY/T tensile strength Tensile testing test pieces test pressure test unit thread threaded pipe transverse ultrasonic inspection Unless otherwise agreed weld bead weld of welded weld seam welded pipe yield strength