Pipe connection methods include welding, hot melt and threaded connections. The hot-melt connection of PP-R pipe is reliable, easy to operate, good air tightness and high interface strength.

The PVC transparent pipe production line is connected with a hand-held fusion splicer for hot-melt connection. Before connecting, remove dust and foreign objects from the pipes and accessories. When the red light of the machine is on and stabilized, align the pipes (pieces) to be connected with a DN<50 hot-melt depth of 1-2MM and a DN<110 hot-melt depth of 2-4MM. When connecting, put the pipe ends without rotation. Insert into the heating jacket to a predetermined depth. At the same time, push the pipe fittings onto the heating head for heating without rotation. After the heating time is reached, immediately remove the pipe and pipe fittings from the heating jacket and the heating head at the same time, and insert them into the required depth quickly and evenly without rotation. A uniform flange is formed at the joint.

Within the specified heating time, the newly welded joint can also be corrected, but rotation is strictly prohibited. When the pipes and fittings are heated, excessive heating should be prevented to make the thickness thinner. The tube is deformed within the fitting. Rotation is strictly prohibited during hot melt intubation and alignment. There shall be no open flame at the operation site, and it is strictly forbidden to bake and bend the pipe with an open flame. When pushing the heated pipes and fittings in vertical alignment, the force should be light to prevent the bend of the elbow. After the connection is completed, the pipes and fittings must be held tightly for sufficient cooling time, and can be released after cooling to a certain extent.

When the PP-R pipe is connected with the metal pipe fitting, the PP-R pipe with metal insert should be used as the transition. The pipe fitting and the PP-R pipe are connected by hot-melt socket and connected with the metal pipe fitting or the hardware fittings of the sanitary ware. When using screw connection, it is advisable to use polypropylene raw material tape as the sealing filler. If there is a faucet connected to the mop pool, install the inner tooth elbow (with internal thread) on the end of the PP-R pipe. During the installation of the pipe, do not use too much force, so as not to damage the threaded fittings and cause leakage at the connection. Pipe cutting can also be cut by special pipe cutting: the bayonet of the pipe scissors should be adjusted to match the diameter of the pipe to be cut, and the force should be evenly applied when rotating and cutting. After cutting, the fracture should be rounded by a matching rounder. When the pipe is broken, the section should be perpendicular to the axis of the pipe without burrs.