For pressure testing equipment and pipelines in construction projects, should hydraulic pressure or pneumatic pressure be used? What determines the choice?
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For pressure testing equipment and pipelines in construction projects, should hydraulic pressure or pneumatic pressure be used? What determines the choice?
Look at the medium being transported? For liquid substances, use water pressure ； For gaseous substances, use air pressure. For hydraulic systems, low-pressure gas can be used first to detect leaks, so as to prevent water from spreading everywhere.
Whenever relevant departments and units require pressure testing using water, such testing must be carried out as specified. Generally, equipment such as medium and high-pressure containers, pipes, and valves is subject to hydrostatic testing, as it is a very safe method. For those without special requirements, pressure testing with air can be used as long as safety is ensured.
What route does your pipeline take? Air leakage refers to compressed air, while liquid leakage refers to water
Usually, water pressure is used； Unless the pressure is very low or the owner has special requirements, gas is compressible and prone to explosions, which is extremely dangerous ； When the pressure here gets quite high, we fill the equipment with water and then apply air pressure to it; this way, the pressure can reach very high levels ； Second, it is relatively safe, with the leakage area being easy to observe
Use as high a water pressure as possible, as it provides greater safety. If water restriction is required, only pneumatic pressure can be used! There are relevant standards!
Check the construction codes and acceptance standards specified in the design drawings and design specifications. There are very clear requirements for all of them
The manufacturing process does not allow water to be present in the equipment’s pipelines. If water is used for pressure testing, it must be drained after the testing is completed, but it’s difficult to drain all the water completely; it’s likely necessary to dry the pipelines as well. This makes things quite troublesome. And if air pressure is used, it’s difficult to identify where there are leaks; there’s no such clarity as with water pressure