一、優(yōu)點：具有強度高、耐沖擊、耐環(huán)境應(yīng)力開裂、耐腐蝕、耐低溫、易焊接、施工簡便、嚴格密封防滲漏等特點。
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、缺點：1、高溫暴曬易老化，不適用于裸露的架空管線；2、露天存放時間不宜過長（3個月以內(nèi)）。
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、生產(chǎn)種類：1、純原料PE管，主要的性能參數(shù)：密度為940-965m/Kg；拉伸強度：大等于19KPa；斷裂伸長率大等于350%；縱向會所率：小等于3%；2、一次再生料PE管，主要的性能參數(shù)：拉伸強度：大等于14-15KPa；斷裂伸長率大等于300%； 3、多次再生料PE管，主要的性能參數(shù)：拉伸強度：大等于12KPa；斷裂伸長率大等于200%。從PE管的技術(shù)性能參數(shù)看均能滿足管材保溫外防護的要求。
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保溫防護管爆裂的原因：1、PE管是聚乙烯塑料制品，陽光暴曬高溫烘烤能使PE管性能快速老化，致使PE管的強度和伸長率降低；2、溫度低于5℃時，PE管變脆伸長率降低；在PE管性能降低后受到撞擊和溫度的驟變產(chǎn)生的膨脹力（收縮力）而使保溫管開裂。3、注料時的工藝造成聚氨酯發(fā)泡料粘度過大，流動性不好，局部密度過大造成PE保溫外防護爆裂。
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、加強聚氨酯發(fā)泡操作技術(shù)工藝水平，根據(jù)溫度合理調(diào)配黑白料配比，避免在高溫下作業(yè)。
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、減少PE管材存放時間， PE管材露天存放時間不超過3個月，成品保溫管存放不超過一個月或存放于庫內(nèi)（陽光不直接暴曬處）。
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、架空管線可以PE外防護保溫管的基礎(chǔ)上外設(shè)薄鐵皮或玻璃鋼等防止陽光直接暴曬，增加使用壽命。
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.
保溫管發(fā)泡的一點個人建議：聚氨酯保溫管具有保溫效果好、吸水率低、防水效果好、接口操作方便的特點，PE外防護管主要起到防水、保護聚氨酯管殼的作用。根據(jù)PE管的性能來看，在溫度變化不大的情況下，PE管的性能基本保持不變，保溫管在埋到地下以后基本能夠保證PE管的性能不變，（地下溫度變化很小）那么現(xiàn)在PE管的種類有3種，再生料的PE管和原料的PE管個上相差接近一倍，從使用效果上看都能夠滿足我們公司的要求（再生料的PE管能夠使用30年，原料的PE管能夠使用50年；但是我們的螺旋焊管管材能使用多少年？，一般情況在15到20年左右，差的在10年左右）。我們公司目前二次網(wǎng)采用的是自己發(fā)泡的保溫管（再生料PE防護管），一次網(wǎng)采用的是國標的外購的保溫管（原料PE防護管）。建議在一次網(wǎng)工程中，管徑在DN500以下的保溫管采用自己發(fā)泡的保溫管或采用再生料PE管殼外防護保溫管，
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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