The brittleness of plastic pipe fittings (PPR, PERT, PVC water supply and drainage pipes) is obvious at low temperature (about 5 °C), and improper handling and construction operations under low temperature conditions can easily cause pipe rupture. In order to ensure the safety of the use of pipes, the following matters need to be paid attention to: strictly regulate the management of product handling, loading, transportation, unloading, and storage, and must not throw, drop, roll or drag the pipes, prevent damage to the products, and prevent plastic pipes and sharp objects. contact friction. With the advent of winter, the temperature will soon drop to about 5 ℃ or even lower, and the surface of the pipe will become slippery when exposed to water and frost. The pipe storage area and the bottom of the carriage should be neatly arranged, and there should be no hard debris such as stones and bricks, so as to avoid the notch effect on the pipes. When the PVC pipe is bent, it should not be too violent, and the force should be applied at a constant speed. PPR pipes should be handled gently by two people, and the pipe caps should be installed at the nozzles. It is strictly forbidden to throw or drop the pipes. Before use, the end of the PPR pipe should be removed by 4-5cm. When cutting the pipe, the end face should be perpendicular to the pipe axis. The pressure test medium is clean water at room temperature. The pipeline should be filled with clean water 24 hours in advance. An exhaust device should be installed at the high water level of the pipeline. The pressure should be increased evenly during the pressure boosting process. value. The directly buried pipeline and the pipeline in the wall shall be poured or blocked after the pressure test and acceptance are qualified in accordance with the requirements of the building code. Effective antifreeze measures should be taken when the water pressure test is carried out in cold regions and in winter, and the clean water in the pipeline must be drained after the test is completed. In order to ensure the safety of the pipeline, try not to pass water when the temperature is about 5 °C, so as to avoid freezing and freezing of the pipes in the pipeline; if it is really necessary to pass the water, the water in the pipeline must be flowing water, and the pipeline should be kept warm and protected.
