Inner control Test with full records: 
Raw material re- inspection ,Products Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test, DWT test), Exterior Size Inspection, Hydrostatic Test, UT test,X-ray Test. Final inspection.
For Nace Mr.0175 specification, HIC, SSC anti-sour pipe test should be send pipe sample to TPCO laboratory
Third party inspection EN 10204/3.2B: CCIC, SGS, BV, Lloyds etc. 
Mill Test Certificate: EN 10204/3.1B, we have API, ISO, CE and TS certificate. 
We configure automatic control system and on-line quality inspection system; fully carry out for each single pipe, the physical and chemical inspection, nondestructive Inspection, hydraulic pressure inspection, Metallographic Analysis to ensure the pipe quality