How is the construction of the circulating water pipeline carried out? ?
Thread Content
With such a large diameter for the circulating water pipes, and since they are laid underground, how is construction carried out? What are the specific requirements? How is it purged after completion? Thank you, I’m a newcomer and don’t know much yet.
Your question is too general; I’ll give you a brief overview. For more details, refer to SH3533 GB50268. First, excavation is carried out; if the groundwater level is high, dewatering measures may be necessary. A 200mm layer of medium sand should be laid as a cushion before placing the pipe segments in the trench. After that, the medium sand is filled up to an angle of 120 degrees relative to the bottom of the pipe. The pipe segments need to be protected against corrosion, with the level of protection determined by the design (taking into account factors such as the underground soil conditions). During construction, attention must be paid to elevation and coordinates. Partial backfilling can be done before pressure testing (but electric spark testing must be conducted before backfilling, and the test voltage should be determined based on the level of corrosion protection), but areas such as welds must remain exposed. After pressure testing, the weld areas need to be protected against corrosion again, followed by electric spark testing. Backfilling should be compacted in layers, typically with a layer thickness of 450 MM. (Compact both sides simultaneously.) This can be washed with water; specific details can be found in the relevant regulations. Steam is not required, and even small pipe sections can be cleaned using the water used for pressure testing. However, for larger pipe sections, it is necessary to enter the inside of the section before lowering it into the trench to check for any large foreign objects.
Are there any relevant materials, standards, or books available? I’d like to ask
Are there any relevant materials, standards, or books available? I’d like to ask