Pipe and fittings should be steered stored in warehouses or sheds instead of   open place and be avoided on the direct sunlight. ?
 Pay attention to fire   prevention. The pipes and fittings should be at least one meter away from heat   sources. The pipes should be piled up levelly on the flat ground so as to avoid   deformation of the pipes. The height of the piles should be not exceeding 2   meters. ?
 The fittings should be piled inlayers. But the piles should not be   too high. ?
 The pipes and fittings should be handled with care in order to   avoid greasy pollution, violently being struck, being touched with sharp and   hard substance and being thrown, rolled and towed etc. on transportation. ?
 Do nits knock on the pipes and fittings with hard things especially when the   temperature is low? ?
 The pipes must be cut vertically in direction of axis   and the incisions are kept clean and flat. The heat-melting connection should be   strictly in accordance with the regulations of depth. ?
 The heat-melting   connection should be in accordance with the regulations of time duration, ?
 The pipes are being connected with fitting with their angle deviation of 5   degrees maximum. ?
 The crooked radius must be at least 8 times as against   the diameter of the pipe. The crooking of the pipe with blazing fire is   prohibited. ?
 If metal screw threads are used they should be producing screw   threads. They can be sealed with linen threads etc. But they must not be screwed   too tight. ?
 The elbow must be used when two pipes are overlapped. ?
 The   water-supply pipes of PP must not be used as hangers and knobs etc. ?
 Where   and in what direction the built-in pipes are should be marked on the floors. It   is not advisable to spike nails and strike on the pipelines.