增强超高分子质量聚乙烯管在给水工程中的应用

提出了中小口径输配水管网采用增强超高分子量聚乙烯(PE150)管代替普通高密度聚乙烯(PE100)管的设想;并建立了PE150和PE100给水管水力计算值参数表,为新型聚乙烯管在给水工程中的推广应用提供依据.     

地基沉降作用下埋地聚乙烯管强度失效的数值模拟

对聚乙烯(PE)管进行不同应变率下的拉伸试验,并采用率相关本构模型获得PE管的材料参数.利用Abaqus软件模拟了埋地PE管在地基沉降作用下的应力-应变行为,分析了PE管应力随沉降位移的变化情况,探讨了过渡段长度对PE管屈服应力的影响.结果表明:PE管的最大Mises应力随沉降位移的增加而增大,危险段发生在过渡段与沉降区或非沉降区的交界处;随着过渡段长度的增加,PE管屈服的沉降位移逐渐增大,在同等沉降位移条件下,长过渡段埋地PE管比短过渡段埋地PE管更安全.     

浅谈住宅建筑室外给水管网聚乙烯管件焊接施工方法

随着聚乙烯(PE)管道在供水行业的发展应用,聚乙烯(PE)管道才开始受到人们的关注。针对住宅建筑室外给水管网聚乙烯(PE)管件性能突显,介绍了聚乙烯(PE)给水管焊接的一般规定,阐述了聚乙烯(PE)给水管施工安装要领,研究了聚乙烯(PE)给水管件的焊接步骤,提出了聚乙烯(PE)管接口施工热熔对接连接方法,以及聚乙烯(PE)管件的焊接质量检验。     

钢丝缠绕增强聚乙烯复合管道系统

介绍了钢丝缠绕增强聚乙烯复合管(PSP管)的结构特点、产品标准、生产工艺、管道连接方式及工程应用技术规程。PSP管具有PE管的优点,又比PE管有更优良的综合性能,特别是在抗快速应力开裂、抗蠕变、持续机械强度性能等方面,明显优于PE管。     

浅谈埋地硬聚氯乙烯（PVC-U）排水管道的结构设计

本文着重讨论硬聚氯乙烯(PVC-U)管的结构设计问题并可作为其它管材的柔性管如高密度聚乙烯(HDPE)管、聚乙烯(PE)管、玻璃纤维增强塑料夹砂管,在其结构设计的参考。     

各地燃气动态

工程竣工消息厦门岛内燃气地下管首度铺设PE管厦门市煤气工程公司在源成花园二期燃气庭院管施工中,首度使用新型管材——燃气用聚乙烯PE管,这种新型燃气管材的使用为海岛区域燃气管道抗腐蚀提供了更佳的选择。据了解,PE管具有轻便、施工操作简单、便于管理、使用寿命长(50年)等     

交通荷载作用下聚乙烯(PE)燃气管道的应力和稳定性分析

近年来,聚乙烯(PE)管道在城镇燃气行业得到了越来越广泛的应用,特别是2008版《聚乙烯燃气管道技术规程》大幅度提高了PE管的最大工作压力、管道直径范围,更有力的拓展了PE管的应用前景。但是,由于PE管管材的柔性特征,人们对其在交通荷载作用下的安全性能仍心存疑虑。本文介绍了PE管的应力和稳定性分析方法,并对一些在交通荷载作用下的管道示例进行了应力和稳定性推导,以说明PE管只要措施得当,使用在车行道下能够确保其安全性。     

室外埋地燃气PE管与建、构筑物成相邻管道之间的水平净距的探讨

现行的《聚乙烯燃气管道工程技术规程》(CJJ63-95)规定的燃气PE管与建、构筑物的基础或相邻管道(不包括供热管)之间的水平净距应符合现行的《城镇燃气设计规范》(GB50028-95)表5.3.2—1的规定,未充分利用燃气PE管与钢质管道相比所具有的性能优势,建议适当缩减。     

聚乙烯燃气管道的应用

介绍了燃气用聚乙烯(PE)管的性能特点及应用，比较了PE80与PE100聚乙烯管道的性能差异，指出了应用中存在的问题。     

聚乙烯管道及钢骨架复合管在燃气管道上的应用分析及探讨

聚乙烯(PE)管作为一种塑料管，国外从20世纪60年代即开始大规模在输送天然气管道上应用，普遍要比国内早几十年。几十年来，塑料以其独特的强度特性、耐腐特性、使用寿命长等特性使自己的适用行业、范围越来越广。起初，用作塑料管的材料种类很多，经过顺序淘汰，到60年代后期，只剩下聚氯乙烯(PVC)和聚乙烯(PE)管，更使PE管在近几年的燃气输送行业应用甚广。     

聚乙烯（PE）管在天然气工程中的应用

介绍了聚乙烯（PE）管在天然气工程中应用时管道的焊接、管道施工等,阐述了管道连接时应注意的问题及相关建议,通过PE管与钢管的比较,总结了PE管的一系列优点,说明PE管在天然气工程中具有良好的发展前景。     

PE100聚乙烯管道应用于天然气中压主干管的分析

本文依据《聚乙烯燃气管道工程技术规程》（q163—2008）,比较了PE100SDRl7．6系列聚乙烯管道与PES0SDR11系列聚乙烯管道和钢管的通过能力和工程投资,分析了PE100SDR17．6系列聚乙烯管道应用于城市天然气中压主干管的可能性．提出了PE100SDR．17．6系列聚乙烯管道替代相应规格钢管的方案．     

Pipeline materials modify the effectiveness of disinfectants in drinking water distribution systems

We studied how pipe material can modify the effectiveness of UV- and chlorine disinfection in drinking water and biofilms. This study was done with two pipe materials: copper and composite plastic (polyethylene, PE) in a pilot scale water distribution network. UV-disinfection decreased viable bacterial numbers in the pilot waterworks and outlet water of pipes on average by 79%, but in biofilms its disinfecting effect was minor. Chlorine decreased effectively the microbial numbers in water and biofilms of PE pipes. In outlet water from copper pipes, the effect of chlorination was weaker; microbial numbers increased back to the level before chlorination within a few days. In the biofilms present in the copper pipes, chlorine decreased microbial numbers only in front of the pipeline. One reason for weaker efficiency of chlorine in copper pipes was that its concentration declined more rapidly in the copper pipes than in the PE pipes. These results means that copper pipes may require a higher chlorine dosage than plastic pipes to achieve effective disinfection of the pipes.     

埋地聚乙烯给水管道在再生水管网中的应用

总结了聚乙烯(PE)管道的优点,并结合再生水对供水管网的要求,探讨了作为新型管材的PE管应用于再生水管网有很好的适用性。综合介绍了PE管材的规格尺寸、连接方式和铺设中须注意的重点等,并结合国家政策对化学建材产业的支持,阐述了聚乙烯管道在再生水管网中的应用前景。     

浅谈PE管在人工煤气输配系统中的应用

本文介绍了国内聚乙烯管开发工作情况，对人工煤气输配系统应用聚乙烯管道的某些参数如ＳＰＲ，密度和熔流率，化学稳定性，柔性，作了简要评述。     

聚乙烯（PE）管应用于定向钻的探讨

PE管在燃气管网中的应用日趋广泛,目前正在尝试性地应用于定向钻穿越.文章就其允许的曲率半径、穿越长度、防腐及回拖时所受的拉伸应力等进行了讨论与比较.     

浅谈给水管聚丁烯PB、聚乙烯PE与铜管的选择

比较了铜管与聚丁烯PB管、聚乙烯PE管的综合材料性能、施工性能和经济性能,认为PB管、PE管的性价比高于铜管,更适用于全装修住宅或高品质住宅小区.     

白蚁对PE燃气管道的破坏及防治措施

介绍白蚁对PE燃气管道的破坏,分析PE管道抵抗白蚁蛀蚀能力的试验,探讨了防治白蚁的措施。     

Investigating ASTM F 1962 arching factor for Polyethylene pipes installed by Horizontal Directional Drilling

Earth pressure on a pipe crown is one of the most significant operational loads considered in the design of Polyethylene (PE) pipes installed by Horizontal Directional Drilling (HDD). The amount of earth pressure depends on the long-term bore conditions as well as the development of a sliding wedge resulting from deformation of the bore due to the overcut and deformation of the PE pipe itself under loadings. Current practices for designing PE pipes in North America is based upon American Society for Testing and Materials (ASTM) F 1962, which is a modified version of Terzaghi’s arching model for earth pressure estimation. There are some concerns regarding the inaccuracy of the ASTM F 1962 arching model. In this study, the ASTM F 1962 arching model for the design of PE pipes installed by HDD is reviewed and compared with other available standards. It was observed that, the ASTM F 1962 arching factor decreases as the soil friction angle increases from 0° to 40°, however, it was mathematically proven that the respective equation shows a minimum at a friction angle of 26.6°, which does not seem to have a physical interpretation. The ASTM F 1962 arching model was also compared with some of the European standards for HDD pipeline design. This study revealed that, the ASTM F 1962 arching model contains some inconsistencies, which are due to the improper modification of Terzaghi’s arching model. Discussions are provided on the issues that exist with regard to the current ASTM F 1962 arching model including the effects of cohesion and soil type on the arching factor. Results of using ASTM F 1962 and the Dutch arching factors in design of some sample PE pipes in three soil conditions for operational loads are also presented. This paper provides some clarifications on the ASTM F 1962 standard, which will assist engineers and contractors in designing PE pipes installed by HDD more accurately.     

Microbiology, chemistry and biofilm development in a pilot drinking water distribution system with copper and plastic pipes

We studied the changes in water quality and formation of biofilms occurring in a pilot-scale water distribution system with two generally used pipe materials: copper and plastic (polyethylene, PE). The formation of biofilms with time was analysed as the number of total bacteria, heterotrophic plate counts and the concentration of ATP in biofilms. At the end of the experiment (after 308 days), microbial community structure, viable biomass and gram-negative bacterial biomass were analysed via lipid biomarkers (phospholipid fatty acids and lipopolysaccharide 3-hydroxy fatty acids), and the numbers of virus-like particles and total bacteria were enumerated by SYBR Green I staining. The formation of biofilm was slower in copper pipes than in the PE pipes, but after 200 days there was no difference in microbial numbers between the pipe materials. Copper ion led to lower microbial numbers in water during the first 200 days, but thereafter there were no differences between the two pipe materials. The number of virus-like particles was lower in biofilms and in outlet water from the copper pipes than PE pipes. Pipe material influenced also the microbial and gram-negative bacterial community structure in biofilms and water.