... Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.Third party inspection:SGS, BV, Lloyds etc.Mill Test CertificateEN ... Welded (EFW)Submerged Arc Welded (SAW)spiral submerged arc welding (SSAW)Double Submerged Arc Welded (DSAW)2.Qualitative ... Of Spiral Pipe5.Manufacturing Process Of Spiral Pipe6.Production Equipment Of Spiral Pipe7. Quality Control Of Spiral Pipe8. ...