The steel pipe connections is greatly convenient for valve pipeline’s installation and dismounting, also safeguard pipeline’s safety operation. Hydro test (pressure measurement) and flaw detection are the two main testing program for steel pipe connections.

Whether carbon steel or stainless steel power delivery joints, they all need to be pressure tested. Generally use water, oil or air as medium to do pressure-tight test in order to assess and confirm the safety quality of steel pipe connectors. For some special requirement steel pipe connectors, it needs to do hydro test and sound emission test at the same time so as to check whether there has cracking, crack initiation and extension of steel pipe connectors.

Flaw detection is mainly to control pressure vessel’s welding quality. Have magnetic power or penetrant testing for material’s groove; have radial or ultrasonic testing for welded joint’s internal defect; have magnetic power or penetrant testing for surface and surface open defect; have magnetic power or penetrant testing for lower limiting value σb > 540MPa material and chrome molybdenum low alloy steel’s flame cut groove surface; have magnetic power testing for ferro magnetic material. Ultrasonic testing(UT) of steel pipe connectors has the advantages of easy to handle and low testing cost.