Problems with pressure testing of heat tracing pipelines
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Let’s discuss whether pressure testing is required for steam tracing pipelines, how to carry out such testing, and which standards specify these requirements Before operation, can’t we just use steam to check for leaks?
The steam pipeline for heating our instruments is connected directly to the steam for leak detection, without going through pressure testing.
Steam tracing pipelines do not require pressure testing; before operation, they can be purged with steam and inspected for leaks directly.
I think pressure testing is absolutely necessary. There are indeed many omissions. The construction workers knew it was a heat tracing pipeline, so the construction quality was very poor; especially in the case of carbon steel pipes used for heat tracing, they leaked the most during pressure testing. Pressure testing is a procedure in the construction acceptance process; any quality issues found are to be addressed by the construction crew (Party B). By the time steam is introduced, it becomes very difficult to have the construction crew handle those issues. Generally, by the time steam is introduced, the on-site construction is already complete and the insulation has been applied. How can you test for leaks in the heating system then? If the heating fluid leaks out first and the insulation isn’t installed yet, that would be very troublesome. . .
According to the definition of pressure pipelines in \"TSG D0001-2009 Safety Technical Supervision Regulations for Pressure Pipelines – Industrial Pipelines\", heating pipes with a diameter of less than or equal to DN25 are not considered pressure pipelines; it is sufficient to conduct a steam leak test before starting up the system. Heating pipes larger than DN25 or jacketed heating pipes require pressure testing.
The construction team charges a fee for pressure testing pipelines. Poor construction quality and inadequate welding are issues; the solution is to improve on-site quality control. If the quality remains poor, work can simply be halted
Well, after it’s done, run steam to test it; if there’s a leak, fix it then! That’s exactly what I do!
Steam tracing pipelines do not require pressure testing. During commissioning, it can be purged directly with steam to check for leaks after operation! There are no specific requirements
Do you do this before insulation or after it? How do you check for leaks after insulation is applied?
Heated pipelines all need to be insulated at the end; as you said, once they are insulated, it becomes impossible to inspect them.