In the process of hydraulic pressure test , in order to ensure the safety of people and equipment, pay attention to the following:

(1) During the boosting process of the hydraulic pressure test, all maintenance operations in the boiler should be suspended. The person in charge of the operation must check whether there are other operators in each part of the furnace before boosting, and notify them to leave temporarily, and then they can start boosting .

(2) During the water pressure test, the personnel responsible for the air valve and the water supply valve shall not leave the operation position without authorization.

(3) In the water pressure experiment, when leakage is found outside the component, the inspector should be kept away from the leakage address during the continuous rise in pressure. Before stopping the pressure increase and checking, you should first understand whether the leakage is developing, and if it is not, check it carefully.

The sealing ring is composed of a polyurethane rubber ring, several fan-shaped support blocks and an L-shaped cooperative device. The sealing cavity of the test head is connected to a hydraulic source.

In the hydrostatic pressure test, the effect of high-pressure water is on the outer edge of the large-gap sealing rubber ring and the Y-shaped seal. The outer edge of the rubber ring is deformed, and the tooling and the test head are pressed along the tooling direction. The Y-type seal also deforms along the Press the tooling and test head in the radial direction of the tooling. During the hydraulic test, a large cavity seal, a Y-shaped seal, a tooling and a test head form a sealed cavity to ensure that high-pressure water does not leak from the tooling and along the radial direction of the steel pipe, ensuring the seal during the hydraulic test. The pressure on the large-gap seal and the Y-seal is maintained together with the hydraulic pressure in the steel pipe, ensuring the sealing effect.

After the hydraulic test is completed, the system is depressurized and drained, and the sealed cavity is quickly unloaded. The large gap seal is quickly restored to the original state. At this time, the steel pipe can enter and exit freely without damaging the seal. The seal does not damage the appearance of the steel pipe. In the initial condition, the inner diameter of the rubber ring, the inner diameter of the fan-shaped block and the L-shaped block are the same. When the rubber ring is under the effect of high pressure water, an external force is applied to the large-gap seal, which causes the polyurethane rubber ring to shrink radially. The L-shaped block and the fan-shaped block cooperate with each other to provide a supporting effect and tightly hold the steel pipe to seal the water pressure.

The large-gap radial seal skill is developed to improve the working power of the steel pipe hydraulic pressure experiment and extend the service life of the sealing system in the hydraulic pressure experiment. It has the value of promotion and application.