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Connection methods in (double-walled polyethylene gravity drainage pipe, single-walled polyethylene pipe under pressure) according to the conditions of internal and external pressures, sealing, resistance to longitudinal movements, resistance to the load caused by pushing or pulling, working and installation conditions And the production conditions (double-walled polyethylene pipes for gravity sewage, single-walled polyethylene pipes under pressure) will be different. Connections and gravity sewer double-walled polyethylene pipes are made in the following ways.
Connection of double-walled polyethylene pipes for gravity sewage by butt weld method
Connection of double-walled polyethylene gravity sewer pipes by electrofusion welding method
Connection of double-walled polyethylene gravity sewer pipes by extrusion welding method
Connection of double-walled polyethylene gravity sewage pipes by mechanical connection method or in other words connection with pressure coupling
Connection of double-walled polyethylene pipes for gravity sewage by butt weld method
This type of connection of gravity double-walled polyethylene pipes is also called thermal connection, in this method, the two ends of gravity double-walled polyethylene pipes are heated simultaneously before connecting. This heat is created by the hot plate and the temperature of the hot plate reaches about 210 degrees Celsius. During the heating and cooling stage, the parameters of time and mechanical pressure applied to the double-walled polyethylene pipe of gravity sewage should be observed.
This type of connection is used for double-walled polyethylene gravity sewer pipes with the same external diameter and similar wall thickness. Due to the existence of tolerance in the wall thickness of the double-walled spiral gravity sewer pipes that are produced based on the inner diameter, there may be problems in aligning and connecting the spiral gravity sewer double-walled polyethylene pipes by the butt welding method.
Connection of double-walled polyethylene gravity sewer pipes by electrofusion welding method
The main difference between this method and the described thermal welding is in the method of applying heat, which is applied from the inside by means of a bobbin. In this method, after placing the double-walled polyethylene gravity sewage pipes at the beginning of each other, the electrofusion plate is wrapped around the gravity double-walled polyethylene pipes, then by applying electric current to the thermal resistance coils, the coil of the coil is heated and It melts the surrounding plastics and creates a proper weld with double-walled polyethylene gravity sewer pipes.
The point of interest in this welding is the electric current required for welding, which must be suitable for the electric coils of the connections. The surface of gravity sewer double-walled polyethylene pipes must be carefully inspected before welding so that it does not have any scratches. Another point in this method is to be careful in sealing the gap between the overlap of the electrofusion plate and gravity sewer double-walled polyethylene pipes.
This method is often used where both gravity sewer double-walled polyethylene pipes are limited and restrained, for example, during repairs of gravity sewer double-walled polyethylene pipes and connection inside the trench, and is one of the best techniques for connecting gravity sewer double-walled polyethylene pipes. It should be noted that the type of bobbins selected for connecting parts has a great impact on the quality of electrofusion welding of double-walled polyethylene gravity sewer pipes.
Connection of double-walled polyethylene gravity sewer pipes by extrusion welding method
This method is usually used to connect gravity sewer double-walled polyethylene pipes with a size larger than 800 mm, to connect gravity sewer double-walled polyethylene pipes to man-made pipes and to make hand-made joints.
First, the edges of the two layers or double-walled polyethylene pipes of gravity sewage and the connection are heated by a hair dryer, then by a manual extruder, molten polyethylene material is injected between the two edges, the material is fed in the form of wire and is formed with the help of a special spatula In this method, the skill and accuracy of the welder is important.
Extruder welding is the best method of connecting gravity sewer double-walled polyethylene pipes in terms of sealing and mechanical resistance, but this method requires more time than other methods and is not applicable for small diameters of gravity sewer double-walled polyethylene pipes.
Connection of gravity sewer double-walled polyethylene pipes by mechanical connection method or connection with pressure coupling.
Some factories that produce double-walled polyethylene gravity sewer pipes with a smooth inner surface, produce double-walled polyethylene gravity sewer pipes with mechanical connection, the advantage of ease of installation and quick operation of this type of gravity double-walled polyethylene pipes is significant.
The double-walled polyethylene gravity sewer pipes are in the form of 6-meter silent branches or with a head coupler to connect the double-walled polyethylene gravity sewer pipes in the form of male and female and with the ability to be sealed by welding or rubber washers and gaskets. The choice of each of the sealing methods depends on the application of the double-walled polyethylene gravity sewer pipe.