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、无补偿直埋敷设方式： 无补偿直埋敷设就是利用土壤和外护管之间的摩擦的阻力固定管道，土壤和管道的摩擦的阻力相加的值大于等于 管道的膨胀力的时候。管线不会再伸长，就可以不加补偿器，这时候管道在热胀冷缩的时候就会产生位移的势能，被 存储在管道壁上。无补偿直埋敷设的时候，在管道上面不用设置补偿器、滑动支架、固定支架等附件，管道在直管段 基本是处在停止的状态。在弯管、出土地方等的自由端在摩擦长度范围内有位移。

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、一次性补偿直埋敷设的方式： 这种聚氨酯直埋保温管敷设方式是在管道的一个地方设置固定的支架和一次性的补偿器，它的工作原理就是把这 种产品的焊管道上，把管道的温度按照要求加热到一定的值，波纹膨胀节会有相对应大压缩，在这种状态下将补偿器 外套筒锯形搭接焊缝焊死，后面补偿器就成为了刚性整体，不再有补偿的能力。工作的时候就是管道的拉伸—压缩的 弹性的变型来补偿，用这个方式，这一段管道的设计温差下产生的变形的总量的一部分就让补偿器来补偿，这个的作 用是让管路工作的时候拉伸压缩的平衡的点在设计温差变形总量的中点，一次性补偿器使用与工作压力≤2.5MPa、工 作温度≤120℃的管道，它的使用的寿命超过30年

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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