聚氨酯直埋保温管特点：1、使用了导热系数低、隔热性能好的硬质聚氨酮作为隔热材料，具有优异的隔热性。2、正常运行后130℃的水输送到40公里以外时，降温仅为1℃左右。3、高强度防水和耐腐蚀能力，不需附设管沟，可直接埋入地下或水中，施工简便迅速，综合造价低。在极端低温条件下也具有良好的耐腐蚀和耐冲击性，可直接埋入冻土层。4、预制保温管使用了耐腐蚀性的(HDPE：高密度聚乙烯)外套管，不受生物和化学腐蚀的影响。5、可根据用户需要提供DN20~DN1200之间各种管径及保温厚度的管材和相配套的管件(弯头、三通、变径管、固定节等)6产品执行城镇建设行业标准CJ/T 114-2000和CJ/T 115-2001标准7，为确保预制直埋保温pipe三位一体，发泡前钢pipe外表面抛丸处理，塑料pipe内表面电晕处理，其中除锈等级达到GB/T 8923-1998中Sa2.5的规定，外壳Pipe内表面张力达到50达因/厘米。

聚氨酮保warm pipe补偿敷设方式：聚氨酮直埋保warm pipe供hot water方法有三种：无补偿方式、一次性补偿方式和有补偿安装方式，因城市生活小区供hot water从经济安全方面考虑均采用温度≤120℃'s hot water，所以现在我们只讨论前两种直埋方式。

无补偿直埋敷设方式：

聚氨酮直埋保warm pipe无补偿直burying敷设即利用土壤与外套pipe之间的摩擦阻力固定pipeline。当土壤与pipeline所产生摩擦阻力的总值大于或等于pipeline膨胀力时,pipeline不再伸长，即可不加supplement器，这时候在构建过程中所产生位移势能，被储存在pipeline壁上；无补偿直burying敷设时，在constructing pipeline上不用设置supplement器滑动支架固定支架等constructing附件,pipeline在整段基本处在停止状态，而在弯曲section,出土section etc自由端所谓“摩擦长度l范围内”piping站稳；依据《集中供heat设计手册》in changing cycle15000 times, heat carrier允许temp差83℃以内其应力值不会超过allowable stress。这一种laying method适用于95℃以下's low temp supply heat pipeline.Yueyang life community central air conditioning water temp for 5℃～70℃, 可以采取no compensation direct burial laying method.

一次性compensation direct burial laying method：

聚氨酮direct bury insulation pipe work principle is that the product is welded onto the pipeline, removing positioning angles steel bar and heating to required temperature, causing expansion of the plastic tube; after which supplementors are pressed into place and sealed with a welding torch; once heated up to working temperature (usually around 80°C), it will compensate for any lengthwise contraction or expansion of the insulated pipe due to thermal changes in the surrounding soil.

The detection items for PE pipes include density, thermal conductivity, tensile strength at breakage rate (TSBR), longitudinal shrinkage rate (LSR), mechanical properties of HDPE outer protective layer materials such as PE material analysis hardness test and other tests like oxygen induction time(OIT). The main types of defects found during these tests include insufficient density or excessive porosity within the insulating material leading to reduced performance over time.

In order to ensure proper functioning without leaks or damage from external factors such as corrosion or abrasion from soil particles in contact with exposed surfaces while buried underground where moisture may penetrate through cracks between layers causing erosion by chemical reactions involving organic matter present on earth’s surface which could potentially cause failure over long periods due mainly because there was not enough space left inside this container containing all necessary components needed before sealing it shut tightly using special tools designed specifically just for this purpose called "extrusion" so they can fit together perfectly when assembled properly preventing any gaps from forming under normal operating conditions given below:

Temperature range: -20°C ~ +60°C

Pressure range: up-to 10 bar

Flow rate: Up-to 100 liters per minute