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1、Proceedings of the 17th Plastic Pipes Conference PPXVII September 22-24, 2014, Chicago, Illinois, USA 100 -YEARS-SERVICE-LIFETIME PREDICTION OF POLYOLEFIN GRAVITY SEWER PIPES 聚丙烯重力排污管道的100 年使用寿命预测Tiem Meijering TEPPFA （欧洲管材和管件协会）Brussels, Belgium Jeannette Mulder Wavin （瓦云）Netherlands G nter Dreilin
2、g Borealis （北欧化工）Linz, Austria Heinz Vogt Lyondellbasell （巴塞尔）Frankfurt a.M, Germany ABSTRACT 文摘In this study, it has been demonstrated that a 100 years service-lifetime for non-pressure sewage pipes, solid wall pipes and structured-wall pipes of PE and PP, can be expected provided some basic condit
3、ions are met. It has been demonstrated that the resistance to thermo-oxidative degradation of the applied materials is sufficient to assure an end-of-life time of at least 100 years. Provided that the allowable stresses at long term are met, brittle pipe failure is not likely to occur. The behavior
4、of the solid wall and structured-wall pipes under constant deflection and strain conditions has been evaluated and relaxation tests have been carried out, showing that at long term the remaining stresses in the pipe do not exceed critical values. The composition of sewer water and the real sewer wat
5、er temperature has no significant effect on the lifetime prediction. A series of excavation projects have been executed where the sewer pipes were already in service during up to a period of 38 years. From the test program it has been concluded that no reduction of pipe quality has been taken place
6、and the prediction of a total service time of 100 years is apparent. 该研究表明，只要满足一些基本条件，PE和 PE的无压排污实壁管，双壁波纹管预期能够达到 100 年的服务寿命。 如满足长期许用应力，不发生管道的脆性破坏，则所用材料的抗热氧化降解能力足以确保这一点。实壁和结构壁管道在恒定形变和应变条件下的性能被评价，应力松弛测试也被进行，这些均表明管道长期运行中的残余应力并没有超过临界值。污水和真实污水温度的混合物并没有对预期寿命有显著影响。一些使用已达38 年的污水管道被挖出进行多项研究。从检测结果可以得到结论，管道的质量
7、没有降低，总的 100 年的服务时间预测是真实可信的。INTRODUCTION 介绍The prediction of the life expectancy of plastic pipe systems is well documented for pressure applications, where stresses in the pipe wall are acting continuously. Hydrostatic tests at different temperatures allow us with Arrhenius extrapolations to make a
8、reliable estimate of the predicted lifetime at specific pressure and temperature ranges. 塑料管道系统中压力管道的平均寿命预测已有许多检测报告。不同温度下的液压测试使得我们能利用阿累尼乌斯外推方法可靠估计塑料管道在特定压力和温度范围内的寿命。In non-pressure applications in sewage and drainage, solid wall and structured-wall pipes are installed and operate without internal pr
9、essures. After installation and subsequent soil settlement, a continuous deflection and so a constant strain loading applies. However, in the current international product standards for non-pressure sewage pipes manufactured from PE or PP no reference has been made to the predicted lifetime of these
10、 pipes. A scientific approach to estimate the lifetime of these pipes and materials in non-pressure applications is not available and no adequate test methods are defined. This study aims to provide sufficient validated data to enable an in-service life expectancy of at least 100 years to be declare
11、d for PE and PP sewer pipes and covers PE and PP pipes according to EN13476-3 (Type B pipes) 1, EN12666 2 and EN18523. 对于无压排污和排水应用，实壁和结构壁管道在安装和运行过程中内部没有压力。在敷设和随后的土壤沉降后，管道会有连续的形变，产生一个恒应变载荷。然而，现行由PE或者 PP制造的无压污水管道国际标准并没有关于这些管道的寿命预测，也没有相应的研究和适当的检测方法。本课题目的就是根据EN13746-3 （B 型管道） 1,EN12666 2 和 EN18523 ，对PE和
12、 PP污水管道能达到100 年的平均寿命提供足够有效的数据。To demonstrate the long term performance of sewer pipes, solid wall and structured-wall, made from PE and PP , the following items have been analyzed and investigated: 为了展示由PE和 PP制造的实壁，结构壁污水管道的长期性能，下面的内容被分析和调查：a.Collection of evidence and providing conditions of suffici
13、ent long term resistance to thermo-oxidative degradation of the used materials. Based on test data from hydrostatic pressure tests and MRS evaluation and Arrhenius extrapolation, the allowable stresses and the related test requirements have been evaluated. 收集和提供所用材料抗热氧化降解的足够证据。根据液压测试，MRS评估和阿累尼乌斯外推，许
14、用应力和相关测试要求也被评估。b.The long term behavior under constant strain loading of non-pressure sewer pipes have been analyzed. Based on relaxation tests, calculations have been made for the prediction of the long term stresses. Estimations have been made regarding the risk of pipe failure under constant defl
15、ection at long term. 分析无压管道在恒应变荷载作用下的长期性能。根据松弛测试，计算预测长期应力。c.The possible effect on the lifetime of the composition and the temperature of the sewer water have been evaluated 评估污水的组成和温度对管道寿命的可能影响。d.Excavation projects have been executed to analyze the remaining quality of the sewer pipes after a peri
16、od of operation and the prediction of remaining lifetime of these pipes. 挖出运行过的污水管道，分析其质量，预测这些管道的剩余寿命。e.The whole test program and the results has been validated by an independent third party authority 所有测试和结果都通过授权的第三方实验室进行。1.Long-term resistance to thermo-oxidative degradation 长期抗热氧老化降解It is widely accepted that due to chemical degradation of the polymer the dominating fracture mechanism in non-pressure pipes is a brittle failure mode. To achieve a 100-years-service-lifetime it has
