PL418957A1 - Sealing coating for pipes in expansion pipe joint and the linear expansion pipe joint - Google Patents

Abstract

The subject of the application is a new sealing coating in a pipe compensator and a linear pipe compensator, especially useful in underground pipelines for transporting liquid and gaseous media. The linear expansion joint includes an outer pipe (1) and a coaxially mounted inner pipe (2) with a projection (5) mounted on the outer side at the end of the pipe (2) with a height equal to the difference between the outer diameter of the inner pipe and the inner pipe where between the inner pipe and the outer tube has two fixed seals (4 and 4 ') characterized by the fact that the inner tube (2) is covered from the outside with the entire length of the insulating layer in the form of a polyurethane coating along the length moving in the outer tube with the outer tube (1) ) and the inner pipe (2) are covered with an electrically conductive layer on the inside and an electrically conductive flexible tongue (3) is attached at the end of the inner pipe (2), whose opposite end rests on the inner part of the inner pipe (1) with the distance between the seals ( 4 and 4 ') between the pipes is equal to the distance of the projection (5) from the closer seal (4).