The bigger the density and velocity of the fluid in pipe , the worse the pipeline ’ s damage . so when buried pipe is designed , density and velocity of the fluid in pipe should be generally considered 管道内输送介质密度和流速越大,管道越易破坏,故在地下管道设计中应充分考虑管内介质的密度与流速。
According to the characteristics of the present city residence , combined with city gas programming , design and accessory construction , this paper discusses the proposal and ideas of gas pipeline design in modem city residential district 摘要针对当前城市住宅发展的特点，结合城市燃气规划、设计和配套建设，探求现代城市住宅小区燃气管道设计方案和思路。
According to the very characteristics of certain biochemical reaction , immobilization of proteins on channel wall for inhomogeneous reactions , channel network design for homogeneous reactions and the advantages of performing biochemical reactions on microfluidic chips are investigated in details 对非均相反应的蛋白质在微管道中的固定技术、均相反应的管道设计技术以及在微流控芯片上集成生化反应的优越性等做了详细的讨论。
These can make up the shortcoming of slrcp ; 2 3 . to study the steel stress development of penstock , ring - form slsfsrcp and horse - shoe slsfsrcp during curing period are monitored . the pre - tension stress due to expansion of self - stressing concrete can be used in design ; 4 对圆形和马蹄形管道进行了28天养护期内力监测，研究了钢衬钢筋钢纤维自应力混凝土压力管道的自应力成长过程，明确了钢筋的预拉应力数值，为此类改性管道设计直接提供依据； 4
The directly buried installation has become the commend method for the district heating piping networks in china , and the designers in the field are in need of the consult date for the exoteric of probability and systemic introduce the design method for the directly buried heating pipe . so this report is try to carry the point 直埋敷设已成为我国区域供热管网推荐的一种敷设方式，该领域的设计人员迫切地需要一套理论联系实际，较系统地介绍直埋热力管道设计方法的参考资料，本论文的编写力求达到这一目的。
In chapter two , the author explains the competitive pattern of the design & construction of oil and gas pipelines in china . the paper also demonstrates the competitive status of cpplb ' s ( i . e . china petroleum pipeline bureau ) competitors in pipeline design and construction under the background of changeful management mechanism and increasingly severe market 第二章节，简单分析了国内目前在油气管道建中设计与施工方面的竞争格局，在陈述cpplb行业性质的同时，进一步陈述和分析了在目前机制转换多变和市场竞争日益激烈的背景下， cpplb在管道设计和施工方面所面临的各路竞争对手的实际情况。
The purpose of the article is to provide effective reference for the development and policy - making of china petroleum pipeline bureau ( i . e . cpplb ) according to study and analyze the similar enterprises to cpplb in pipeline design and construction 本研究的目的，就是通过研究和剖析与中国石油天然气管道局(以下简称cpplb )在管道设计与施工建设方面业务相近的若干国内相关企业，通过案例分析，从不同角度进行专题研究， “知己知彼，百战不殆” ，以便为cpplb的发展壮大和科学决策提供有效的依据。
Now the prestressed concrete penstock with ring - like strands has been attached more and more importance and has been done many significant studies . combined with the hydraulic technique key project of ministry of water resources : research on loading behaviors and design methods of perestressed concrete penstock ( sz9422 ) and the three gorges construction research project : design and analysis of prestressed concrete penstock with steel liner in the three gorges power station , several main tasks have been done as following . 1 本文结合水利部水利科技重点项目《预应力混凝土压力管道受力性能与计算方法研究》 ( sz9422 )和三峡工程施工科研项目《三峡电站钢衬预应力混凝土联合受力压力管道设计方案选择及论证分析》 ( ct - 00 - 2 - 3 、 ct - 01 - 02 - 01 ) ，主要进行了如下几方面的工作： 1
