Questions about hydrostatic testing
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GB150 stipulates that continuous pressure application to maintain pressure is not allowed during hydrostatic testing. How is this taken into consideration? Why is continuous pressure application not allowed? Is pulse pressure application acceptable?
The compressibility of liquids is very low; if a pressure pump is needed to maintain a certain pressure, then there must be leaks in the system. Intermittent pressurization is also a problem, and the cause needs to be identified. Otherwise, pressure testing loses its meaning.
During the hydrostatic test, continuous pressure application is used to maintain the pressure and identify any leakage points that allow pressure to escape from the equipment.
If no leaks are detected during the hydrostatic test, but the pressure cannot be maintained, could it be due to a drop in temperature? Pressurizing in short pulses at this time should not be a problem, right? As I understand it, continuous pressure application is not allowed; was the possibility of overpressure in the equipment due to continuous pressure application taken into account?
If it is a hydrostatic test, what happens if the water temperature drops? This causes the pressure to not be maintained.
When the water temperature drops, the change in water density is not significant, so it shouldn’t prevent the pressure from being maintained, right?:)
If pressure cannot be maintained at all, there must be a leakage point in the system; otherwise, how could the pressure not be retained? A thorough inspection of the system will reveal such issues, not only in the connection surfaces of the containers but also in the piping used for testing as well as in the testing machine itself. The standard does not allow continuous pressurization to maintain a certain pressure value on the gauge, as the goal is to ensure that there are no unnoticed leakage points during the pressure test.
The hydrostatic testing process lasts only half an hour, so temperature changes can be ignored. With continuous pressure maintenance, there must be leakage points, including internal leakage within the pressure pump itself.
No, once the test pressure is reached, further pressurization is not allowed. Check if there is voltage drop.