In general, cold water pipes (white) are used for domestic water supply, condensed water, oxygen, compressed air, and other chemical liquids; hot water pipes (orange) are used for heating piping systems and ground radiant heating piping systems; gas pipes (yellow) are used for For natural gas, liquefied gas, gas pipelines. The connection of the aluminum-plastic composite pipe is of the ferrule type, so the first step in the construction is to pass a strict pressure test to check whether the connection is firm. The second is to prevent frequent vibration and loosen the ferrule. The third is to leave enough installation in the length direction to avoid pulling off. The identification of PPR aluminum-plastic composite pipe, high-quality aluminum-plastic pipe is a 5-layer wrapping structure, there is a layer of hot sol between polyethylene and aluminum pipe, and the two layers cannot be peeled off; inferior aluminum-plastic pipe is a three-layer structure, aluminum and poly There is no hot melt adhesive between vinyls, and it is easier to peel off by hand. In terms of processing technology, high-quality aluminum-plastic pipes are finely processed, and the text on the outside of the pipe is inkjet printed, and the handwriting is similar to the handwriting on the bottom of the can; the price of inferior aluminum-plastic pipes is often very cheap, because it uses ordinary non-high-density poly Vinyl material, the text on the outside of the pipe, printed with an ordinary printing machine, the handwriting is blurred.
