Thermo-couplers

For joining pipes to each other, either butt welding or a special thermo-coupler equipped with a heating element (metallic wire) inside can be used. When ordering the coupler, the outer diameter of the pipes to be connected should be specified, and when using it, the heating modes should be taken into account.

During the installation of the pipe route, the pipes are inserted into the coupler. After that a current source is connected to the coupler, thanks to which the wire is heated, and the coupler is fused together with the pipes, providing a reliable hermetic non-disassembled connection of the pipes with each other.

Caps

Important cable lines usually equipped with reserve pipe, which may be required in case of main pipe damage. Any reserve pipe should be equipped with caps that close pipe ends and thereby eliminate pipe silting.

Another case where the caps installation required is a time-stretched construction of a cable line, when at the first stage only pipes are laid in the ground, and cable pulling is postponed for a considerable time.

Funnels

During the tightening of cables into the pipe, their outer sheath may be damaged by the sharp edge of the pipe. Also, during the operation of the cable line, the cable touches the pipe’s edge and due to the pressure of the ground and transport, it can damage the sheath. To prevent cable sheath damage, each pipe must be equipped with a protective funnel before cable is tightened into the pipe.

Funnels and caps can be attached to the pipe ends either by butt welding, or by thermo-couplers.

Seals

It is necessary to prevent pipe silting so that the cable can always be removed from the pipe for repair or replacement. To do this, the gap between the cable(s) and the pipe should be sealed at the pipe ends . Such sealing is performed by ring seals of two main types — for 1 cable (1 phase) or for 3 cables (3 phases).