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General Requirements and Technical Measures for Pipeline Laying in Jinyuan Pipeline Industry
Date : 2019-03-20 10:26:32

1. Lower pipe: When the pipe is transported and put into the ditch, the reliable soft belt hanger should be used to smooth down the ditch. No severe collision with the ditch wall or the ditch bottom should be avoided to avoid the flat of the pipe mouth, resulting in the uneven gap around the pipe after insertion or insertion of the pipe fittings, which will affect the welding quality.
Pipe laying: Before installation, PESI and SRTP pipes should be scraped off by inserting the pipes into the surface oxide layer at the length of the pipes. Scraping thickness of 0.1-0.2mm can be done with sharp tools such as scrapers, saw blades or glass, or with electric Chiba grinding wheel blades. It is forbidden to dismantle packing bags before installation of electrothermal fusion pipe fittings. Oil contamination in the fittings must be wiped clean. Clear oxidation layer treatment operation is also needed in the inner wall welding zone. During the socket process of pipe fittings and pipes, attention should be paid to the cleaning of welding zone. After removing the oxide layer, the cotton yarn and cotton cloth without dehairing should be used to wipe the part. Pipes and fittings must be inserted in place when they are connected. (Draw the socket distance with a marking brush). The matching gap around the pipe should be adjusted as evenly as possible, and the pipe and fittings should be aligned on the same axis (to ensure vertical). When installing, the bending radius of the pipe should not be less than 125 times the diameter of the pipe, and the installation deviation angle of the pipe fittings should not be greater than 2 degrees.
3 Piers: When installing flange joint valves and pipe fittings, measures should be taken to prevent external tension stress. Piles with diameters greater than 100 mm should be supported under valves. Pipeline piers should not be installed on loose soil. The back of pipes should be close to undisturbed soil. Rubber gaskets should be laid between piers and pipes to prevent pipeline damage.
4 bushing: steel bushing should be installed when water supply pipeline crosses drainage, lightning protection device, cable, highway, river, etc.
Note: When the installation and laying of pipelines are interrupted, cork or other protective cover shall be used to seal the nozzle to prevent the entry of debris. When erecting risers, the upper part of the socketed fittings should be sealed with tape before welding, so as to avoid dust and sewage entering the unwelded fittings along the pipe wall.

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