Subject: bus bar line of the pipes bus bar line of the pipes - черта труб?Ditch Burying Burry is done with the earth which not contains sand, grass, root of tree or foreign matters. The burying depth should be at least 200 mm above the bus bar line of the pipes. The earth on two sides of pipes should be rammed, and then put one more layer of earth with 200-300 mm on it and ram, too.
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