聚氨酯保温管在很多重要的领域都发挥着不容忽视的重要作用，比如航天、供热系统、空调、化工和石油等等，所以聚氨酯保温管的施工问题一直被广为关注，任何一处细节都有可能造成施工的失败。而且在真正进行施工的时候，现场环境的不同所选择的施工方式也是不同的，不同的施工方式有着不一样的特点，所要注意的细节也有所不同，下面就让我们来看看在聚氨酯保温管施工流程中，哪些是特别需要注意的问题：

　　Polyurethane insulation pipe plays an important role in many important fields, such as aerospace, heating system, central air conditioning, chemical industry and petroleum, etc., so the construction of polyurethane insulation pipe has been widely concerned, and any detail may cause construction failure. And in the real construction, different construction methods are selected for different site environment, different construction methods have different characteristics, and the details to be paid attention to are also different. Let's take a look at the construction process of polyurethane insulation pipe, which are the issues to be paid special attention to:

　　工程应该注意的细节：

　　Details to be paid attention to in the project:

　　一、工作人员在进入现场之后一定要认真仔细的进行检验，对于施工之前的相关检验程序是非常关键的。任何不合格的设备、保温管以及原材料都拒绝使用。

　　First, after entering the site, the staff must carefully carry out inspection, which is very important for the relevant inspection procedures before construction. Any unqualified equipment, heat preservation pipes and raw materials are rejected.

　　第二、在进行聚氨酯保温管施工焊接的环节，也是整个工程质量的关键所在。所以大家一定要多多注意支架的固定、管道的焊接等程序。要知道这两个步骤直接影响后期整个保温工程的质量和效果，也直接决定了整个管道的使用寿命。

　　Second, in the construction and welding of polyurethane insulation pipe, it is also the key to the quality of the whole project. So we must pay more attention to the fixing of supports, welding of pipes and other procedures. It should be known that these two steps directly affect the quality and effect of the whole insulation project in the later stage, and also directly determine the service life of the whole pipeline.

　　第三、在满足打压的标准下，应该重视管道的打压情况。这个步骤应该分为两个环节进行，稳压十分内没有渗漏的现象可以开始调升压力。然后利用符合标准重量的小锤子在焊缝周围进行敲击检查，看看是否存在渗漏的现象。更后将聚氨酯保温管内的压力调到工作压力范围内，如果半小时左右不出现渗漏的情况，那么就算合格了。

　　Third, in order to meet the pressure standard, we should pay attention to the pipe pressure. This step should be divided into two parts. First, the pressure can be adjusted if there is no leakage within 10% of the stabilized pressure. Then use a small hammer conforming to the standard weight to knock around the weld to check whether there is leakage. Finally, adjust the pressure in the polyurethane insulation pipe to the working pressure range. If there is no leakage in about half an hour, then it is qualified.

　　第四、要知道这样的聚氨酯保温管施工是直接敷设在地下，通常这样的工程都是隐蔽工程。如果在进行施工或是检验过程当中，存在丝毫的马虎或是竣工验收不仔细，那么在日后的使用运行过程当中，也可能存在频频故障或是其他现象出现。就算聚氨酯保温管施工工程完毕之后，也需要相关单位派遣专人进行严格认真的验收检查。

　　Fourth, it is necessary to know that such polyurethane insulation pipe construction is directly laid underground, usually such projects are concealed works. If there is a slightest carelessness or careless completion acceptance in the process of construction or inspection, there may be frequent faults or other phenomena in the future use and operation process. Even after the construction of polyurethane insulation pipe is completed, relevant units need to send special personnel to carry out strict and serious acceptance inspection.

　　第五、不管选择哪一种聚氨酯保温管施工方法，都应该注重管道的质量以及不能出现开裂、脱层等情况。更关键的是一定要保证管道的接头拥有符合规定的防水性、严密性以及整体性。

　　Fifth, no matter which polyurethane insulation pipe construction method is selected, attention should be paid to the quality of the pipe and the situation of no cracking and delamination. The most important thing is to ensure that the joint of the pipeline has the waterproof, tightness and integrity as required.

　　由于不同厂家生产的保温管、管件及接头所用的外护管的材料不同，材料的熔体流动速率值会不同。如接头处外护层与相邻的直管或管件的外护管所用材料的熔体流动速率值不匹配，会影响其焊接质量，从而影响接头外护层的密封性能。所以，应尽可能采用同一厂家的保温管、管件及保温接头。当工作管采用不同材质、不同壁厚的钢管时会产生局部应力集中，需要设计进行强度校核。

　　Because of the different materials of the heat preservation pipes, pipe fittings and joints produced by different manufacturers, the melt flow rate of the materials will be different. If the melt flow rate value of the outer sheath at the joint does not match with that of the outer sheath of the adjacent straight pipe or pipe fitting, the welding quality will be affected and the sealing performance of the outer sheath of the joint will be affected. Therefore, heat preservation pipes, pipe fittings and joints of the same manufacturer shall be used as far as possible. When the working pipe is made of different materials and wall thicknesses, local stress concentration will occur, which needs to be checked by design.

　　冬期施工时，由于环境温度低，接口保温发泡质量会受影响，所以应尽量避开冬期施工。不能避免时，接头发泡前，应对工作钢管、外护管表面及发泡原料加热后再进行保温发泡。

　　During winter construction, due to the low ambient temperature, the quality of interface insulation and foaming will be affected, so winter construction should be avoided as far as possible. If it can't be avoided, the working steel pipe, the surface of outer protective pipe and foaming raw material shall be heated before foaming.

　　浸湿的保温材料如不，在管网高温运行过程中，残留在保温层中的水由于管网温度的升高而汽化，会导致保温层的碳化并破坏接头外护层的密封性。

　　If the wetted insulation material is not removed, during the high temperature operation of the pipe network, the water remaining in the insulation layer will vaporize due to the increase of the pipe network temperature, which will cause the carbonization of the insulation layer and destroy the sealing of the outer protective layer of the joint.

　　外护层与其两侧的保温管外护管的搭接长度不应小于100mm，以保证接头外护层的强度及密封性。尤其对于热熔焊式接头，外护层的熔焊区域应完全与保温管的外护管搭接，以保证熔焊质量及密封性。

　　The overlapping length between the outer protective layer and the outer protective tube of the insulation tube on both sides shall not be less than 100mm to ensure the strength and sealing of the outer protective layer of the joint. Especially for the hot-melt welding joint, the fusion welding area of the outer protective layer shall be completely overlapped with the outer protective tube of the insulating tube to ensure the fusion welding quality and tightness.

　　接头质量对管网的整体质量及寿命有关重要的影响。如果接头处密封不能保证，水进入接头后，高温运行时会导致聚氨酯保温材料碳化失效，破坏预制直埋保温管系统的整体式结构，导致整个管网系统失效。所以，接头处必须进行100％的气密性检验。

　　The joint quality has a crucial influence on the overall quality and service life of the pipe network. If the sealing at the joint cannot be guaranteed, when the water enters the joint, the high temperature operation will lead to the carbonization failure of polyurethane insulation materials, damage the integral structure of the prefabricated directly buried insulation pipe system, and lead to the failure of the whole pipe network system. Therefore, 100% air tightness test must be carried out at the joint.