The circulating water pipes are laid underground; what should be done with the water after pressure testing?
Thread Content
The circulating water pipes are laid underground; what should be done with the water after pressure testing? For buried circulating water pipes, a hydrostatic test is required after construction is completed. I wonder what the best way to handle this water once the test is successful is Could an expert please explain this? Thank you!
Return to the pool and discharge into the return water. In the case of water pipes, if no treatment is required after pressure testing, they can remain in use.
It is more convenient to carry out pressure testing on the entire circulation water pipeline once all construction is completed. However, when pressure testing is done in sections, it is difficult to drain the water, and the time required for a full-system water flush remains uncertain; what problems could arise if the water stays in the pipes?
It is best to first perform a gas leak test, and then conduct a water pressure test. Ensure construction quality through on-site supervision of each section within the pipeline; flushing is merely a formality. Note: Use detergent solution as the foaming leak detection fluid for application. Gas leak testing, appropriate pressure application (what about 0.05 MPa? ), according to the design pressure, it must not be exceeded; appropriate pressurization testing for leak detection is sufficient. The quality of welding can generally be seen from the outside; since strength is a concern, it is best to have the weld inspected before conducting a leak test, especially for pipes with large diameters and high pressure.
1. Direct on-site discharge 2. Centralized recovery
On-site discharge involves buried pipelines, making it difficult to discharge； In many projects, the diameter of the circulating water pipelines is 2 meters or even larger, and there is a large amount of water inside these pipes. What consequences could arise if that water remained inside the pipes?
Using air pressure to detect leaks is one method; it can save a significant amount of water. The detection process is a bit more complicated, but the overall results are good. I’m not sure whether it’s allowed by the standards to use air pressure instead of water pressure Also, is it possible to use kerosene for leakage?
What I mean is to use a pressure test with a pressure slightly higher than atmospheric pressure, mainly for those areas with minor leaks; by ensuring that such issues are resolved, your work with water and construction will be much easier. Just make a small hole and connect a temporary tube to carry out pressurization. If it is circulating water, the pressure is likely to be at least 0.2 MPa or higher; using a pressure of 0.05 MPa for pressing will not cause any problems. Get a small air pump with a pressure of 0.8 MPa, and attach a pressure gauge to the large pipe. For stamping, at an approximate pressure testing value, simply set the air pump pressure to be linked with the pressure testing value. Finally, the actual water pressure.
It is understood that in many companies’ projects, the large size of the pipes results in lengthy processes for excavation, construction, and inspection, which hinders on-site work. As a result, they often weld the pipes first and then conduct flaw detection at night; if the pipes pass the inspection, they are backfilled without carrying out pressure testing. It is unclear whether this approach complies with relevant standards or procedures