Hydraulic test
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I saw the chemical plant applying pressure to the storage tanks, requiring the pressure to reach over 20 kilograms. However, since water is an incompressible liquid, how is pressure applied to the water after filling the tank? Is it to inject a certain amount of water into the storage tank to increase the pressure? So, is the water in the container static or dynamic after pressurization? If it were static, wouldn’t the hydrostatic pressure of water increase, meaning its density would increase? I hope the seniors can give me some guidance
The first image was seen online; the second image is from TSG. Liquids also have compressibility, though it is much lower than that of gases, which is why hydraulic testing is relatively safe.
There is no absolute water; air will dissolve in it. During a hydrostatic test, the gas in the water is compressed first, and then the liquid. Carbonated beverages such as cola consist of liquid water, syrup, and carbon dioxide dissolved in water. When at rest, there’s no problem, but once subjected to vigorous movements like shaking or dropping, the contents can spray out through the bottle cap or other weak points. Therefore, a pneumatic test is more dangerous than a gas-liquid mixture test, and a gas-liquid mixture test is more dangerous than a hydraulic test.
Is there energy conversion? The kinetic energy of the booster pump was converted into potential energy.
It depends on the specific conditions of your pressure testing. If the testing system is placed on the ground at the same level as the pump’s outlet, where does the potential energy come from? During pressure testing, liquid such as water, oil, or another fluid is introduced at the lowest possible point, while air is expelled from the highest point. During the pressurization process, the test system is already filled with liquid; only a small amount more of liquid is added (usually far less than what is needed to fill the system completely) to increase the pressure. I believe that the potential energy effect can be ignored.
Water is incompressible, but it can transmit pressure; just look at a car hydraulic jack. One end pushes against him while the other end transfers this force. Moreover, the pressure is the same in all directions. Specifically for conducting hydrostatic tests, you can use a static water head or a pump to apply this force.
Is this topic also considered a question? Water enters at the lower level and air is exhausted at the higher level; for strength testing, the pressure is generally maintained for 30 minutes, after which it is reduced to the design pressure for a thorough inspection
Pressure vessels are generally first pressurized with water, and if necessary, then with air