What are the common connecting methods for plastic PP pipes?
The electric wire welding method: the oxidation of the tube surface skin removed, insert pipe specifications corresponding with the electric heating element, the heating element to the rated current through a certain period of time, polypropylene pipe fittings and pipe joints to heat and melt each other, turn off the power, thus forming an inseparable interface. The butt welding of the pipe end treatment method: first, with the heating plate placed on well tube and tube or pipe and pipe fittings, set the heating temperature, close the control power, heating, pumping out the heating piece, and then ends by force rapid docking together to form a high cooling. The strength of trapezoidal interface, its interface strength and bulk material. Flexible flange connection method: in the plastic flange place steel looper flange, and then put the appropriate gasket, string into the specified bolt, tighten it.
The common ways of connecting plastic pipes are adhesive connection, rubber ring connection, welding connection, and mechanical (clamp type pipe fitting) connection. For polypropylene (PP) pipes, there are three common ways of connection, namely, hot wire welding, butt welding and loop flange connection.
Because the hot melt connection method does not need any additional material, and can melt the connection part as a whole, achieves the body strength, the connection effect is good, therefore, here recommends the use of hot melt connection method. The use of hot-melt bonding method should pay attention to the following: first, the hot melt tool to connect the power supply, to the working temperature, the indicator light before the start of operation; II. Cutting the pipe material, you must make the surface perpendicular to the pipe axis. The general use of pipe cutting scissors or pipe cutting machine, using sharp hacksaw when necessary, but after cutting the pipe section should remove burrs; the PP pipe and pipe connection end must be clean, dry and free of grease; the welding elbow or three pass, according to the requirements of design drawings, we should pay attention to its direction in a straight direction pipe and tube, mark the location with the auxiliary mark the connection, no rotation; the end of the guide tube heating sleeve is inserted into the standard depth, at the same time, no rotating the pipe onto the heating head and reached the prescribed mark; the heating time is reached after, immediately put the pipe and pipe fittings from the heating sleeve and the heating head removed simultaneously, quickly and without rotation inserted into the standard depth, making joints form a uniform flange of the joint can be corrected, but not the rotation; to a prescribed cooling time, will The pipe cover is buckled on the pipe fittings.
