一、优点：具有强度高、耐冲击、耐环境应力开裂、耐腐蚀、耐低温、易焊接、施工简便、严格密封防渗漏等特点。
1、 Advantages: it has the characteristics of high strength, impact resistance, environmental stress cracking resistance, corrosion resistance, low temperature resistance, easy welding, simple construction, strict sealing and anti leakage.
二、缺点：1、高温暴晒易老化，不适用于裸露的架空管线；2、露天存放时间不宜过长（3个月以内）。
2、 Disadvantages: 1. High temperature exposure is easy to aging, not suitable for exposed overhead pipelines; 2. Outdoor storage time should not be too long (within 3 months).
三、生产种类：1、纯原料PE管，主要的性能参数：密度为940-965m/Kg；拉伸强度：大等于19KPa；断裂伸长率大等于350%；纵向会所率：小等于3%；2、一次再生料PE管，主要的性能参数：拉伸强度：大等于14-15KPa；断裂伸长率大等于300%； 3、多次再生料PE管，主要的性能参数：拉伸强度：大等于12KPa；断裂伸长率大等于200%。从PE管的技术性能参数看均能满足管材保温外防护的要求。
3、 Production type: 1. Pure raw material PE pipe, main performance parameters: density 940-965m / kg; tensile strength: 19 kPa; elongation at break: 350%; longitudinal rate: less than 3%; 2. Primary recycled PE pipe, main performance parameters: tensile strength: 14-15kpa; elongation at break: 300%; 3. The main performance parameters of PE pipe with multiple recycled materials are: tensile strength: 12 kPa; elongation at break: 200%. From the technical performance parameters of PE pipe, it can meet the requirements of thermal insulation and external protection.造成PE保温防护管爆裂的原因：1、PE管是聚乙烯塑料制品，阳光暴晒高温烘烤能使PE管性能快速老化，致使PE管的强度和伸长率降低；2、温度低于5℃时，PE管变脆伸长率降低；在PE管性能降低后受到撞击和温度的骤变产生的膨胀力（收缩力）而使保温管开裂。3、注料时的工艺造成聚氨酯发泡料粘度过大，流动性不好，局部密度过大造成PE保温外防护爆裂。
The reasons for the burst of PE insulation protection pipe are as follows: 1. PE pipe is a kind of polyethylene plastic product, which can be quickly aged by sunlight exposure and high temperature baking, resulting in the decrease of PE pipe strength and elongation; 2. When the temperature is lower than 5 ℃, the PE pipe becomes brittle and the elongation decreases; after the PE pipe performance is reduced, it is subjected to the expansion force (shrinkage force) produced by impact and sudden change of temperature, which causes the insulation pipe to crack. 3. The process of injection causes the viscosity of polyurethane foam material to be too high, the fluidity is not good, and the local density is too high, which results in the burst of external protection of PE insulation.
方案：1、加强聚氨酯发泡操作技术工艺水平，根据温度合理调配黑白料配比，避免在高温下作业。
Solutions: 1. Strengthen the level of polyurethane foam operation technology, reasonably allocate the black and white material ratio according to the temperature, and avoid working at high temperature.
2、减少PE管材存放时间， PE管材露天存放时间不超过3个月，成品保温管存放不超过一个月或存放于库内（阳光不直接暴晒处）。
2. The storage time of PE pipes should be reduced. The outdoor storage time of PE pipes should not exceed 3 months, and the finished insulation pipes should not be stored for more than one month or stored in the warehouse (where the sunlight is not directly exposed).
3、架空管线可以PE外防护保温管的基础上外设薄铁皮或玻璃钢等防止阳光直接暴晒，增加使用寿命。
3. The overhead pipeline can be protected by PE, and thin iron sheet or glass fiber reinforced plastic can be set on the basis of insulation pipe to prevent direct sunlight exposure and increase service life.
保温管发泡的一点个人建议：聚氨酯保温管具有保温效果好、吸水率低、防水效果好、接口操作方便的特点，PE外防护管主要起到防水、保护聚氨酯管壳的作用。根据PE管的性能来看，在温度变化不大的情况下，PE管的性能基本保持不变，保温管在埋到地下以后基本能够保证PE管的性能不变，（地下温度变化很小）那么现在PE管的种类有3种，再生料的PE管和原料的PE管个上相差接近一倍，从使用效果上看都能够满足我们公司的要求（再生料的PE管能够使用30年，原料的PE管能够使用50年；但是我们的螺旋焊管管材能使用多少年？，一般情况在15到20年左右，差的在10年左右）。我们公司目前二次网采用的是自己发泡的保温管（再生料PE防护管），一次网采用的是国标的外购的保温管（原料PE防护管）。建议在一次网工程中，管径在DN500以下的保温管采用自己发泡的保温管或采用再生料PE管壳外防护保温管，
Some personal suggestions on foam insulation pipe: polyurethane insulation pipe has the characteristics of good heat preservation effect, low water absorption rate, good waterproof effect and convenient interface operation. PE external protection pipe mainly plays the role of waterproof and protecting polyurethane pipe shell. According to the performance of PE pipes, when the temperature changes little, the performance of PE pipes is basically unchanged, and the performance of PE pipes can be basically guaranteed after the insulation pipes are buried in the ground. (the underground temperature changes very little). Now there are three kinds of PE pipes. The price difference between recycled PE pipes and raw PE pipes is close to double. From the perspective of application effect, they can meet the requirements of our company The PE pipe of recycled material can be used for 30 years, and the PE pipe of raw material can be used for 50 years; but how many years can our spiral welded pipe be used? In general, it is about 15 to 20 years, and the poor is about 10 years). At present, our company uses its own foam insulation pipe (recycled material PE protection pipe), and the primary network adopts the national standard outsourcing insulation pipe (raw material PE protective pipe). It is suggested that in the primary network project, the insulation pipe with diameter less than DN500 should adopt self foaming insulation pipe or recycled PE pipe shell protection insulation pipe,
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