Methods for joining PE pipes

docking welding.

There are two ways:

• welding.Apply mounting sockets or sleeves;
• connection HDPE pipes without welding Fittings.

If you need a one-piece unit, the method is applied "welding".

If necessary detachable unit, then connect the HDPE pipe fittings you need.With fittings (plastic couplings with sleeves made of metal) can be docked and polymer and polyethylene fittings with aluminum, copper and steel counterparts.

also to provide a detachable connection flanges are used - special items.But first it needs welding flanges to the pipe.

There are three ways:

• mounting of electro.The pipes are placed into the box (the tee, bends), inside which there is a fusible spiral.After connecting to the welding transformer coil heats the abutment;
• installation of the socket.Heated shoulder connected with the heated bell;
• installation butt.By heat pressure welding ends connected heated.

dock welding possible thanks Polyethylene thermoplasticity.At temperatures above 175 ° C the polymer fibers break down into molecules, and the temperature is lowered - intermolecular bonds occur between parts materials.

However, these technologies are implemented in different ways:

• mounting with electric connections suggests this order: first the pipes are cut off, then it is necessary to degrease the surface.And only then the ends are placed in electric welding, which is connected to the welding transformer.Fusible spiral softens the surface of the sleeve and the pipe.Secure connection is formed after cooling;
• assembly into the socket: a tube is put on the pin and a box of welding soldering iron, which heats up the joint.Related elements are pressed her hands after removal from the heating calibers;
• butt: the ends cut off at a right angle.Next, place the tube into the guides.The ends are pressed against the heating element.After warming up the heating element is removed and the ends are compressed by guides.

compound polyethylene pipe without welding.

HDPE pipes without welding involves the use of compression fittings.Mounting pipe is securing the pin fitting mechanically.This fixation is possible thanks to the O-ring or the same pipe elasticity.

next order of operations:

1. ensure that the pipe section was strictly perpendicular to its axis.Preparation slices for welding;
2. unscrew the nut fitting, insert the end of the pipe firmly into the fitting;
3. assemble fitting: to put on the pipe nut, spacer, rubber ring and tighten the nut.

In the case where the lock is due to the elasticity of the pipe body:

1. end extend expanders - a special tool, which extends the valve body;
2. clutch unwind and put the pipe mounting nut;
3. extended end is put on the coupling pin;
4. tighten the locknut.

After this happens reverse the shrinkage effect, ie the diameter of the pipe will be original.

Flanged HDPE pipes.

The polyethylene pipes, other than compression couplings and flange fittings are used.

As a result, there are two clutches in the confines of a single body: the compression and flange.Due to this coupling flange can be used in piping and medium and high pressure.