共查询到19条相似文献,搜索用时 171 毫秒
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管道使用过程中,会因磨损、氧化等问题使管道内壁受损,进而导致管道不能正常工作甚至发生事故.针对此问题设计一款智能管道机器人,此管道机器设计人包括核心控制、驱动、测量、反馈四大部分.主要运用对比的方法从管道机器人在不同管道环境中自主移动、准确计程、定位、检测等几方面进行设计分析,得到智能管道机器人的基本设计方案.解决了狭窄管难以施工的问题,加快工作效率,在加快我国管道智能化管理方面有重要意义. 相似文献
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《压力容器》2015,(8)
对ASME B31.12—2014与ASME B31.8—2014关于埋地长输管道线路设计部分中管材选择、管道设计、管道焊接及无损检测、管道试压、管道阀室、埋深、间距等方面进行了对比分析,得出:与天然气长输管道设计相比,氢气长输管道用钢管选材存在一定限制条件,其直管段钢管设计公式中考虑了材料性能系数的影响,热煨弯管设计方法不同,强度试压介质及试压压力值存在差别,在钢管焊前预热及焊后热处理、埋地管道最小覆土厚度、与地下其他管道和建构筑物间距及穿越公(铁)路套管要求等方面要求更严格。氢气与天然气长输管道对冷弯弯管、环焊缝无损检测、阀室设置以及严密性试压的相关要求是一致的。所以,应用现有天然气管网设施输送氢气及天然气管道转变为氢气管道时需要进行全面分析、论证,确保管道安全可靠。 相似文献
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管道支吊架在管道系统中经常是不被重视的部分,但实际上其结构及布置的合理性对于管道系统的安全至关重要.论文较全面介绍了低温输送管线系统中支吊架设计应考虑的相关要点,包括支吊架合理布置的重要性、管道支吊架的分类和常见各种结构形式、管道支吊架的材料选择,管道支吊架的选用原则,管道支吊架的布置要点等.由于管道支架的结构和布置必须首先满足管系的推力值,所以根据不同类型的管架着重给出了相关推力及跨距计算方法. 相似文献
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刘知远 《现代仪器使用与维修》2012,(5):60-62
本文从基本构造、操作要点、常见问题及对策、日常维护等方面介绍Agi-lent LC1100高效液相色谱议的相关知识,着重论述实际操作使用过程中的经验和体会,为正确、合理使用该仪器提供有价值的参考。 相似文献
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产品设计中形位公差的合理选用与正确标注 总被引:1,自引:0,他引:1
本文针对机械零件的使用功能和设计要求,从形位公差原则的选用,形位公差项目的选择 ,基准的选用及公差值的给定等方面讨论了在产品设计和应用中的形位公差的合理选用与正确标注。 相似文献
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大亚湾核电站再热器系统疏水泵(GSS)容易出现振动偏高的现象,在处理这些设备故障的过程中,根据设备的结构特点,设备的管路特性,结合长期的操作实践经验,注重进行原因分析,寻找合适的解决办法,通过状态监测与诊断,开发专用器具、改变设备结构刚度等手段,使设备的振动问题得到较好的解决,同时为类似设备的振动问题处理提供借鉴。 相似文献
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Many years experience of the operation of high stress (>72% specified minimum yield strength,SMYS) gas pipelines and statistical analysis results of pipeline incidents showed that the operating pipelines at stress levels over 72% SMYS have not presented problems in USA and Canada,and design factor does not control incidents or the safety of pipelines.Enhancing pipeline safety management level is most important for decreasing incident rate.The application history of higher design factors in the U.S and Canada was reviewed.And the effect of higher factors to the critical flaw size,puncture resistance,change of reliability with time,risk level and the arrest toughness requirements of pipeline were analyzed here.The comparison of pipeline failure rates and risk levels between two design factors (0.72 and 0.8) has shown that a change in design factor from 0.72 to 0.8 would bring little effect on failure rates and risk levels.On the basis of the analysis result,the application feasibility of design factor of 0.8 in China was discussed and the related suggestions were proposed.When an operator wishes to apply design factor 0.8 to gas pipeline,the following process is recommended: stress level of line pipe hydro test should be up to 100% SMYS,reliability and risk assessment at the design feasibility or conceptual stage should be conducted,Charpy impact energy should meet the need of pipeline crack arrest;and establish and execute risk based integrity management plan.The technology of pipeline steel metallurgy,line pipe fabrication and pipeline construction,and line pipe quality control level in China achieved tremendous progresses,and line pipe product standards and property indexes have come up to international advanced level.Furthermore,pipeline safety management has improved greatly in China.Consequently,the research for the feasibility of application of design factor of 0.8 in China has fundamental basis. 相似文献
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TANG Jinglin WANG Liwei LI Xia 《机械工程学报(英文版)》2009,22(2):250-255
Rational determination and reduction of local energy loss of oil flow at pipe junctions are of important significance to improve hydraulic pipeline's work efficiency, especially for complex hydraulic pipeline connected by isodiametric T-type ducts with sharp comers to get combined and divided flow. From this point of view, the formulae of resistance loss for combined flow and divided flow through isodiametric T-type duct with sharp comers as well as the correlations of resistance loss coefficients in the branches of the duct are derived using energy method. On this basis, resistance characteristics of hydraulic oil in the duct are obtained by numerical simulation of different flow modes, which are commonly applied in hydraulic pipelines, using computational fluid dynamics (CFD) method, and the reasons for the resistance loss are analyzed based on the pressure change mechanism in the flow field. A part of simulation results was validated with the reference data. The research shows that for combined flows the resistance loss of symmetrical is lower than that of tmsymmetrical to obtain low speed in common branch, but to gain high speed is quite the contrary, for divided flows, the symmetrical is always a reasonable choice to reduce resistance loss. These conclusions can be applied to optimize the design of hydraulic pipeline. 相似文献