Spiral pipe hydrostatic test

One of the inspection methods for spiral pipes is to carry out hydrostatic test, so what is the hydrostatic test tested? The carbon steel pipe manufacturer will introduce it below.

The hydraulic test in the construction of spiral steel pipe is a comprehensive inspection of the quality of pipe materials, joints, construction, etc., and it is an indispensable key test item before project acceptance.

Calculation formula of hydrostatic test pressure of spiral steel pipe:

(P: test pressure of hydrostatic test, unit Mpa; S: test stress of hydrostatic test, unit Mpa; T: nominal wall thickness of steel pipe, unit mm; D: nominal outer diameter of steel pipe, unit mm), calculation results Accurate to 0.1Mpa.

The hydrostatic pressure test of the spiral welded pipe is to test whether the steel pipe meets the design requirements at the specified pressure through the process of filling the test steel pipe with water, pressurizing, and maintaining the pressure. It is the most intuitive and closest to the actual use of the steel pipe. A detection method. The inspection standard clearly requires that each spiral welded pipe needs to undergo a hydrostatic pressure test, mainly to check that the weld or pipe body is not damaged or leaked under the specified level of pressure.

While the hydrostatic pressure test checks the quality of the steel pipe itself, the test steel pipe will undergo certain elastic-plastic deformation under the superimposed action of the hydrostatic pressure load and the existing residual stress, which will affect the overall size, mechanical properties and distribution of residual stress of the steel pipe. The quality of these three aspects is closely related to the safety of pipeline operation, so it is of great significance to study the influence of hydrostatic pressure test on the external dimensions, mechanical properties and residual stress distribution of spiral welded pipes.

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