... x52 black steel pipe line 2.API certificate 3.NDT,UT,ET, hydro tests 4.SGS Test ... low pressure liquid delivery, general structure, mechanical structure Quality Standard: API 5L|IS1978-1982|ASTM A53 | DIN 2458 |EN10217 | SY/T5037 ... strength, Yield strength, Elongation, Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray ...