There are three methods for laying heating pipes with polyurethane directly buried insulation pipes: non compensation mode, one-time compensation mode and installation mode with compensation. The reason why hot water with temperature ≤ 120 ℃ is used is that the pipeline of living quarters is considered from two aspects of economy and safety. The high temperature resistance of polyurethane directly buried insulation pipe can reach 120 ℃. Let's just talk about the first two ways.

1. Direct burial without compensation: direct buried laying without compensation is to fix the pipeline by using the friction resistance between the soil and the external protection pipe, and the value of the friction resistance of the soil and the pipeline is greater than or equal to the expansion force of the pipeline. If the pipeline does not elongate any more, it can not add compensator. At this time, the displacement potential energy will be generated when the pipeline expands and shrinks, and is stored on the pipe wall. When the pipeline is directly buried without compensation, there is no need to set compensator, sliding support, fixed support and other accessories on the pipeline, and the pipeline is basically in the stop state in the straight pipe section. There is displacement in the free end of bending pipe and excavated place within the friction length range.

2. One time compensation directly buried laying method: this polyurethane directly buried insulation pipe laying method is to set a fixed support and one-time compensator in a place of the pipeline. Its working principle is to heat the pipe temperature to a certain value according to the requirements on the welding pipe of this product, and the corrugated expansion joint will have corresponding large compression. In this state, the compensator will be adjusted When the saw lap weld of the outer sleeve is welded, the back compensator becomes a rigid whole and has no compensation ability. In this way, a part of the total deformation caused by the design temperature difference of this section of pipeline is compensated by the compensator When the pipeline is working, the balance point of tension and compression is at the middle point of the total design temperature difference deformation. The disposable compensator is used for pipes with working pressure ≤ 2.5MPa and working temperature ≤ 120 ℃. Its service life is more than 30 years

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