The hydrostatic pressure test is an indispensable part of the steel pipe manufacturing process. Its aim to detect the anti-leakage function of the steel pipe under the standard test pressure and the stable time. Same as radiographic, ultrasonic and other flaw detection techniques, it is a way to check the overall quality of casing pipe. So what are the requires for the hydrostatic pressure test of oil casing pipe? Here is a brief introduction:

1. The hydrostatic test pressure value of the pipe with coupling and thread is the lowest value of the hydrostatic test pressure of the flat-end pipe, the maximum hydrostatic test pressure of the coupling, and the minimum value of the internal pressure leakage resistance, but the maximum pressure of the criterion is 69MPa, and the calculated pressure, the value is around 0.5 MPa.

2. According to API requirements, the hydrostatic test pressure measuring device should be calibrated within 4 months before each use.

3. If customers have unique requirements, a higher hydraulic test pressure can be selected.

4. Leakage in hydrostatic pressure test is evidence of rejection.

5. Unless agreed between the purchaser and the manufacturer, the coupling blank, coupling raw material, adjacent raw materials or Q125 steel grade sub-joints are not required to do hydrostatic pressure test.

The above are the rules for the hydrostatic pressure test of petroleum casing pipes. Welcome to contact us.