Plastic pipes in building materials replace galvanized steel pipes.

  Plastic pipes in building materials replace galvanized steel pipes.

For a long time, the traditional hot galvanized steel pipes are used in the cold and hot water supply. With the continuous development of the economy, people's values and concepts of life have undergone tremendous changes, the pursuit of health and environmental protection has become the first choice, so the water quality requirements of tap water are increasingly valued.

According to the survey, the main reason for the deterioration of water quality is the corrosion of pipelines. Therefore, in recent years, construction departments have vigorously promoted and adopted a new type of non-corrosive plastic pipes to replace galvanized pipes. Random copolymer polypropylene (PP-R) pipes, cross-linked polyethylene (PE-x) pipes, aluminum-plastic composite pipes, polybutylene (PB) pipes and other new building water supply pipes have become the preferred market.

How is the connection method?

When PP-R pipes are connected by hot melt or electric melt, the pipes and fittings must be of the same material, and special equipment approved by the material supplier shall be used for installation.

The PP-R pipe with metal insert should be used as the transitional part for the connection between PP-R pipe and metal pipe. The pipe fittings and PP-R pipe are connected by hot melt, and the metal pipe is connected by threads. Large diameter pipes can also be connected by flanges.

When piping is connected by hot melt, the following steps shall be taken:

(1) connect the hot-melt tool to the power until the working temperature indicator lights up.

(2) cut the tube, and the Shen end is perpendicular to the axis of the tube. Tube cutting is generally used in the shear or pipe cutting machine, if necessary, the use of steel saw, but after cutting the end of the pipe should be removed burr, burr.

(3) the connection surfaces between pipes and fittings should be clean, dry and oil-free.

(4) use the appropriate pen to draw the hot melting depth at the end of the tube.

(5) when welding elbow or three links, attention should be paid to the direction of the nozzle according to the requirements of the design drawings.

(6) When connecting, insert the pipe end into the heating sleeve of the hot melt tool without rotation until the marked depth; at the same time, insert the pipe fittings into the heating head of the hot melt tool without rotation, and reach the prescribed mark. The heating time shall meet the requirements of the hot melting tool manufacturer. After reaching the heating time, the pipe and fittings shall be removed from the heating sleeve and the heating head at the same time. The pipe and fittings shall be inserted rapidly and uniformly in a straight line without rotation, reaching the specified depth and forming a uniform rib at the joint.