Data from the equipment pressure test
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Recently, we have experienced the commissioning of new equipment as well as maintenance work, and there are some issues that continue to plague us. I hope those with more experience can offer guidance: regarding tower equipment, tank equipment, and heat exchangers, how is the pressure value determined during pressure testing? This includes water pressure and air pressure. Additionally, for tower equipment, is the pressure test generally conducted on the top pressure or the bottom pressure of the tower? I earnestly request your valuable advice!
What is your major? There’s a lot to say about this issue. Simply put, a pressure test is meant to determine the pressure resistance of a device. The method used should be such that it allows one to conclude that the device’s pressure resistance has been verified. The specific details are very simple.
There are **standards** for pressure requirements: the water pressure should generally be 1.15 times the design pressure, while the air pressure should be 1.05 times it
It’s complex in theory, but much simpler in practice. Pressure tests include strength tests and tightness tests. Strength tests mainly check for defects in the material, deformation of various parts of the container, the strength of welded joints, and leaks in flange connections ； Density tests include airtightness tests, kerosene leakage tests, and ammonia leak detection tests, among others. Theoretically, there are specific formulas for the pressures used in strength tests; moreover, the temperature of the liquid and gas used in these tests must be controlled, and if water is used, the chloride ion concentration must also be controlled. The stresses in the cylinder are then checked using relevant formulas. In fact, the pressure testing after major repairs consists of two parts: one is the pressure testing of the heat exchanger (using water pressure), and the other is the pressure testing of the tower (using steam or air). A hydrostatic test was conducted on the heat exchanger; there were no temperature control measures, and the water used was ordinary circulating water, with the pressure being 1.25 times the operating pressure. For the tower, it seems to be 1 MPa; there is no material inside the tower, and there must be a certain pressure at the top and bottom of the tower.