◆PVC－U　pipe is applicable for the transportation of liquids no more than 45℃. ◆Pressure grade over1.0Mpa PVC-U pipes should be adopt inside the building pressure pipes and use the special adhesive provided by the company. ◆The pipes should be concealing buried or take relative protection methods in the places may be often collided places. ◆While the PVC-U pressure pipe is buried in the outdoor exposing places and freezing basements,the light weight materiall should be adopted　in the freezing or sunlight irradiation places to thermal insulation and heat preservation. ◆PVC-U pressure pipe should be buried far away from heat. ◆PVC-U pipe desige flow rate shall not be over 1.5m/s,normally13m/s. ◆The flow velocity should≤2m/s while washing the PVC-U pipes. ◆Tt is strictly prohibited to be stroked,thrown,fallen,rolled and dragged,and collide with the shape objects in transporting,loading and unloading and storage the PVC-U pipes.It also should avoid sludge oil and sunlight irradiation.The stock place should be flat and tide .The expansion end of the flared pipe should be alternately stocked to avoid distortion. ◆The adhesive joint should not be constructed under 5℃,and the rubber ring joint should not be constructed under -10℃,The adhesive construction site is strictly prohibited from fire. ●The inserting length should accord with the stipulations in the following table while the pipe adopts the rubber ring joint(R-R joint) Nominal outside diameter(mm) 63 75 90 110 125 140 160 200 225 250 315 355 400 500 Inserting length（mm） 110 120 130 130 140 145 150 170 190 200 230 250 270 285 ●See the following table for the standing solidifying time while adopting the adhesive jojnt (T-S joint). Nominal outside diameter(mm) Surface temperature on piping 18℃-40℃ 5℃-18℃ ≤50 20 30 63-90 45 60 ◆The adhesive with color changed,agglomeration and deposition should be prohibited to be used. ◆The pipes and appearance of the pares must be checked in installing and using. The broken and distorted one is prohibited from construction.