What are the specifications for welding PE pipe fittings

What are the specifications for welding PE pipe fittings
PE pipe manufacturers in the welding system, the requirements are particularly high, because if the improper construction will cause a large number of products gradually broken.
First, each welded pipe in the construction of a masonry well and concrete base to prevent the displacement of the fracture. Second, the trench bottom should be smooth, usually with a diameter of not more than 50mm without sharp stones and mixed material of sand and clay, flat bottom, gully density should be at least density reached around the landfill materials. Third, each pipe must be flat in the ditch, because the welded pipe fittings will have 1 - 3 different manual welding mouth, if the placement is not level, the bottom is not good, the stress will cause fracture.
In addition, the welding pipe fittings and the backfill on both sides of the pipeline is very important, backfill should be symmetrical, layered, each layer of about 30cm, according to the requirements of compaction, in order to prevent displacement, layer by layer compaction.

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