Pressure test for internal leakage of control valve
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The pressure before the control valve is 5.88 Mpa, while the pressure after the valve is 2.3 Mpa; thus the pressure difference is 3.58 Mpa. The pressure drop when the valve is fully closed is 6.2 Mpa! The leakage level is grade 4! What pressure is required to conduct a tightness test by applying pressure to check for internal leakage in valves? We previously applied nominal pressures of 1.5 times and 1.1 times the specified value, but according to the standards, for a leakage level of four, only 0.35 Mpa is required for pressurization? I was completely confused!
The 1.5-fold test is for strength, while the leakiness test is conducted in accordance with the standards.
Is the valve leakage test the same as the internal leakage tightness test?
GB/T-4213-2008
Other pressures can also be used for leakage tests, and standards provide formulas for calculating leakage rates.
Refer to the answer above; I also learned * it, and for specific details you can also consult the manufacturer
No problem – for IV leakage, a water pressure test of 0.35 MPAG is sufficient; 1.5 times the design pressure represents a high pressure level used to check for external leaks
Is a pressure of over 40 kilograms used in field operations also subject to a pressure test at 0.35 Mpa?
According to the internal leakage test standard FCI 70-2 Class IV for control valves, the test medium can be water or gas. The test pressure is generally 3-4 bar, or the maximum pressure difference, whichever is lower. For example, if your pressure difference is 10 bar, it will be measured based on 3–4 bar; if your pressure difference is only 2 bar, then it will be measured based on 2 bar. The maximum allowable leakage rate is: 0.01% of the valve’s rated capacity