... Co., Ltd offers independent lab test reports for our Spiral steel pipes when required. Test reports are from a ... ), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.Third party inspection:SGS, ... Spiral Pipe5.Manufacturing Process Of Spiral Pipe6.Production Equipment Of Spiral Pipe7. Quality Control Of Spiral Pipe8 ...