Problems with pressure testing of large-diameter, long-distance pipelines.
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As the title suggests, I need to construct a sewage pipeline with a diameter of DN1200, using spiral-welded submerged arc welded steel pipes. The total length is around 10 kilometers; a valve is installed only at the pump outlet, and the pump’s head is approximately 20 meters. Do pipes like this need to be pressure-tested? And if so, how should the testing be carried out?
For the construction of such projects, it is best to conduct pressure tests in stages first, and then a full-scale pressure test at the end; the key is to check the welding strength. If pressure testing for connectivity is carried out first, a large amount of water will be discharged in the event of leaks or breaks that need to be repaired, which will affect the subsequent remedial work. For reference.
Pressure testing is definitely necessary; if there’s a leak, it will be a problem!