Regarding pressure testing
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What are the standards for detecting leaks in pressure vessels during hydrotesting under normal circumstances?
When the test pressure is reached, the power-long-sleeve pipeline must be held at that pressure for 10 minutes, while the chemical process pipeline must be held there for 20 minutes. The test is considered successful if the pressure gauge pointer does not drop and no deformation of the pipeline is visible to the eye.
Article 99 of the Code stipulates that a pressure vessel after a hydrostatic test is considered qualified if it meets the following conditions: 1. There are no leaks. 2. No visible deformation. 3. No abnormal noises were heard during the test. 4. For materials whose specified minimum tensile strength is greater than or equal to 540 Mpa, no cracks were detected on their surfaces as a result of random non-destructive testing.
1. No leakage. 2. No visible deformation. 3. No abnormal noises were heard during the test. 4. For materials whose specified minimum tensile strength is greater than or equal to 540 Mpa, no cracks were detected on their surfaces as a result of random non-destructive testing.
Specific equipment must be constructed in accordance with its design specifications; for example, heat exchangers should follow GB151 \"Shell and Tube Heat Exchangers\".
No leakage； No deformation ； No abnormal noises ； No cracks were detected in the surface through random non-destructive testing.
Take a look at the relevant regulations and inspection guidelines, and follow the prescribed procedures. It’s better to be cautious when dealing with pressure vessels, otherwise it will be difficult to avoid legal responsibility if problems arise in the future. :lol
Pressure tests include hydrostatic testing, pneumatic testing, and airtightness testing. The main difference lies in the test pressure. A hydrostatic test is used to test the strength of testing equipment ； The airtightness test checks the tightness of the testing equipment. If hydraulic testing is not possible, pneumatic testing can be used as a substitute, but the pressure used in pneumatic testing is different from that used in hydraulic testing
For the hydraulic test, reference can be made to the provisions of Articles 98 and 99 of the capacity regulations
According to the specification requirements, it is considered qualified if it meets the following conditions: 1. No leakage. 2. No visible deformation. 3. No abnormal noises were heard during the test. 4. For materials whose specified minimum tensile strength is greater than or equal to 540 Mpa, no cracks were detected on their surfaces as a result of random non-destructive testing.
The acceptance criteria for the pressure test are as follows: 1. The pressure-bearing components show no visible abnormal deformation; 2. There are no leaks in the container walls or welds; 3. For containers for which residual deformation needs to be determined, such deformation is measured during the pressure test: the radial residual deformation rate must be ≤0.03%, or the volumetric residual deformation rate must be ≤10%
Pressure tests include hydrostatic testing, pneumatic testing, and airtightness testing. The main difference lies in the test pressure. A hydrostatic test is used to test the strength of testing equipment ； The airtightness test checks the tightness of the testing equipment. If hydraulic testing is not possible, pneumatic testing can be used as a substitute, but the pressure used in pneumatic testing is different from that used in hydraulic testing