Corrosion and insulation issues in engineering construction? !
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We are now in the final stages of the project construction, with intensive work being carried out on anti-corrosion and insulation. I would like to ask whether pipes that have undergone pressure testing and leak checks should still be insulated What if it is? How to ensure heat loss and safe operation of steam and gas pipelines during production? For ammonia pipelines, if insulation is applied only after ammonia is introduced, how can cooling be achieved? Wait, let’s discuss this?
Speaking of our company’s standard practices, for newly added steam pipes and similar components, we first conduct leak and pressure tests to check for any issues such as defects in the welds or air leaks. Additionally, the pressure test helps to remove any residues from the welds inside the pipes; only after ensuring there are no problems do we proceed with insulation work. The losses you mentioned are inevitable; it’s essential to ensure proper insulation, and the condensate water in the pipes must be removed. Steam traps should be installed according to the diameter of the steam pipes – for larger diameters, U-shaped tubes need to be used when installing the pipes, with steam traps placed below these U-shaped tubes.
Reply to 1# yfjin2010: Steam pipes and gas pipes need to undergo pressure tests with water and gas, followed by insulation. Of course, the insulation efficiency needs to be taken into consideration. Ammonia pipes also require pressure tests with water and gas, after which they are insulated, usually using polyurethane. It should be noted that steam, gas, and ammonia pipelines all fall under the category of pressure pipelines, and their installation must be carried out by units qualified to do so. It is necessary to submit an installation notification to the Quality Supervision Bureau. During installation, supervision by the relevant department of the Special Equipment Inspection Institute is required. After installation, hydraulic and pneumatic tests as well as flaw detection inspections are conducted, and a supervision report is issued by the relevant department of the Special Equipment Inspection Institute. Finally, the pressure pipeline must be registered with the Quality Supervision Bureau. Under no circumstances should you be careless, otherwise the process of obtaining subsequent production licenses will be very troublesome.