Pressure hydrostatic test for welded pipes

Hydrostatic test is necessary to ensure the quality ofwelded pipeproduction equipment. Currently, the market is on the market pipe hydrostatic testing machine working process: feeding, clamping, filled with water, pressure, pressure, pressure relief, the material. The process also constitutes a basic action hydraulic tube loop, most modern hydraulic test machine adopts PLC control, so that all the work automatically in order to complete the process and parameters with automatic recording function test results. According seal can be divided into radial seal and seal. Radial seal is used with the pipe with inner or outer diameter seal, seal pressure through expansion in order to achieve the purpose of sealing the wall, the advantage of steel clamping and extraction is very easy, reliable sealing, pipe axial force is small, is not easy to bend, but the sealing head structure more complex specifications more, and the pipe end there blind test; seal sealing material is to rely on the spout nozzle face seal compression to achieve the purpose of testing the advantage of simple structure, , common good, but the sealing material properties and water pressure proportional and servo control systems require higher.

Pipe hydrostatic testing machine during the pressure test, the first sealing device right through the end of the test tube is sealed at both ends and low-pressure water injection, water injection process through the exhaust valve exhaust air in the tube, filled with water at low pressure, by increasing pressure device to inject high pressure water pipe pressurized until the required test pressure. After reaching the required test pressure holding pressure at the stipulated time, if the pipe is no leakage in the pressure test, deformation phenomena, proceed relief. Then open ends of the sealing device, the discharge pressure water pipe will be tested to the examination table visually inspected for suspicious penetration. Pressure test according to the standard required for the pressure curve during automatic recording device records.