How To Carry Out Hydraulic Test On Oil Casing Pipe

The hydraulic test of oil casing is an indispensable part of the production process of steel pipe. Its function is to test the leakage resistance of steel pipe under standard test pressure and voltage regulation time. It is the same as the flaw detection process of ray and ultrasonic. It is an important means to test the overall quality of petroleum steel pipes. Simply put, it’s the pipe full of water,test under the pressure state that it can maintain the specified pressure without leakage or rupture. Its operation includes three steps of flushing, pressure test and water control. Pay attention to the following points during operation:

1. Parameter setting: According to the size of the oil pipe to be tested, the steel grade (simply the material of the casing pipe) and the thread type (button type) are set. Check the pressure value, and the voltage regulation time;
2. Perform a full-length hydrostatic test on each petroleum pipe. Actual test pressure and. Less regulation time must comply with the regulations of the process card (sometimes according to the quality of the raw materials, the adjustment time is properly adjusted);
3. In the process of pressure test, it is necessary to check whether the seals are in good condition and there are traces of water leakage at any time;
4. The test pressure control range of the petroleum pipe is: ≥ the standard hydraulic pressure test pressure;
5. Carefully fill in the hydrostatic pressure test record;
6. With the coupling and threaded pipe hydrostatic pressure test pressure value is the flat end pipe hydrostatic test pressure, coupling. The value of the large hydrostatic test pressure and the internal pressure leakage resistance is low, but the standard high pressure is 69 MPa, and the calculated pressure value is generally rounded to close to 0.5 MPa;
7. According to the API requirements, the hydrostatic pressure test pressure measuring device should be calibrated within 4 months before each use;
8. If the demand side has special requirements, a higher hydraulic test pressure can be used;
9. Hydrostatic pressure test leakage is the basis for rejection;
10. Except as otherwise agreed between the purchaser and the manufacturer, the coupling blank, coupling material, nearby materials or Q125 steel grade short sections are not required to perform hydrostatic test;
11. If the actual hydrostatic pressure test pressure cannot reach the standard pressure due to equipment reasons, it is necessary to notify the technical department in time to carry out the corresponding process adjustment.

The oil casing hydraulic testing machine is used to test the bearing pressure of the casing, the experimental pressure is 70mpa, 9 5/8″, 7″, 5 1/2″, 5″, 4 1/2″, 3 1/2″ , 2 7/8 and other sleeves that meet different specifications of apispec5ct. The supercharged cylinder is used for supercharging, the supercharging method is fast and reliable, and the automatic control system is equipped to display the pressure curve in real time, output the experimental report, and save the test data.

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