... our Spiral steel pipes when required. Test reports are from a well-known, certified lab and state the yield, tensile and ... Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.Third party inspection:SGS, BV, Lloyds etc.Mill ... the manufacturer&trader of Spiral pipes in China• Producer of a wide range of quality products: ERW Black & G.I. pipes ...