保温管用耐热聚乙烯(PE-RTⅡ)管道技术与应用  

Technology and application of heat resistant polyethylene(PE-RT Ⅱ ) pipe for thermal insulation

作　　者：唐木正 Tang Muzheng(Tianjin Senpu Pipe Co.LTD.,Tianjin 300270,China)

机构地区：[1]天津森普管材有限公司,天津300270

出　　处：《橡塑技术与装备》2021年第12期38-43,共6页China Rubber/Plastics Technology and Equipment

摘　　要：在燃气、给水领域已实现以塑代钢,但在热力管道领域,主要以钢管为主,但钢管耐腐蚀差的缺点,严重造成热力管道跑、冒、滴、漏问题频发,每年因此带来的维修,造成的城市交通问题日益突出。因此,在热力管道领域,保温用耐温聚乙烯管材技术给热力领域带来了曙光,采暖用二级管网的热水输送温度一般在60~95℃,输送压力,一般0.4~1.0 MPa,一般的低密度或中密度耐温聚乙烯,为普通Ⅰ型PERT,但管材的耐温、耐压及管材的环应力性能较低,在三级管网输水末端散热使用没有问题,但是二级管网压力大、温度高,普通Ⅰ型耐温聚乙烯PERT管材不能满足要求。PE-RTⅡ型材料在各项性能方面有了很大的提高,环应力提高13%以上,在因温度升高压力折减方面也有很大提高。在抗蠕变性能方面进一步改善,长期使用性能也有了保证,从而在热水输送成为可能。但是,热力管网毕竟是高温高压,所以要满足要求,耐热聚乙烯管材壁厚仍然很厚,耐热聚乙烯管材管系列S5、S4、S3.2、S2.5,相当于管材径厚比值SDR11、SDR9、SDR7.4、SDR6,管材的加工难度非常大,技术水平与质量要求较高。这也是本次介绍的重点。In the field of gas and water supply,plastic has been used instead of steel,but in the field of thermal pipeline,steel pipe is mainly used.However,the poor corrosion resistance of steel pipe seriously causes the frequent problems of evaporating,emitting,dripping and leaking of thermal pipeline.The annual maintenance causes increasingly prominent urban traffic problems.Therefore,in the field of thermal pipeline,the technology of heat-resistant polyethylene pipe for thermal insulation brings hope to the thermal field.The hot water delivery temperature of the secondary pipe network for heating is generally 60~95℃,and the delivery pressure is generally 0.4~1.0 MPa.The general low-density or medium density heat-resistant polyethylene is ordinary type I PERT,but the pipe has low temperature resistance,pressure resistance and ring stress performance.There is no problem of heat dissipation at the end of the third-stage pipe network,but due to the high pressure and high temperature of the secondary pipe network,the ordinary type I heatresistant polyethylene PERT pipe can not meet the requirements.The properties of PE-RTⅡmaterial have been greatly improved.The ring stress has been increased by more than 13%,and the pressure reduction has also been greatly improved due to the increase of temperature.In addition,the creep resistance is further improved and the long-term service performance is guaranteed,which makes it possible to use in hot water transportation.However,the thermal pipe network is high temperature and high pressure after all.In order to meet the requirements,the wall thickness of heat-resistant polyethylene pipe is still very thick.The heatresistant polyethylene pipe series S5,S4,S3.2,S2.5 are equivalent to the pipe diameter thickness ratio SDR11,SDR9,SDR 7.4,SDR6.The pipe processing is very difficult,and the technical level and quality requirements are high.This is also the focus of this presentation.

关 键 词：PE-RTⅡ(耐热聚乙烯Ⅱ型) S值 热熔 长期静液压 蠕变 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]