不压井更换闸阀技术在气井维护中的应用

高压气井采气井口的1号主控闸阀若产生泄漏、开关不动等问题，将影响气井的正常生产和维护保养，并存在安全隐患，这给气井的安全生产带来了严重危害。文章介绍了利用下油管堵塞器更换井口1号闸阀的原理、相关参数设计方法，以及施工所需的工具和作业过程等。该技术操作简单，不需压井，对气井产层不会产生污染，实施费用低。近年来，靖边气田应用不压井更换井口1号闸阀技术对部分气井的闸阀进行了更换，取得了十分理想的效果。     

浅谈中央空调运行管理

目前，中央空调系统在设计施工交付使用后，运行管理普遍存在诸多问题，影响正常使用及其使用寿命。笔者针对目前空调使用中存在的问题，提出解决问题的方法。     

涂装作业中过滤网的选用和维护

阐述了涂装作业中使用过滤网进行空气洁净处理的目的，着重介绍通风系统中过滤器的选用、维护和安装指南。对重复使用过滤器的利弊进行分析。     

大排量螺杆泵在大港油田的应用

目前大港油田部分开发区已进入高含水开发后期 ,大排量提液成为这些开发区稳产的一个重要途径。普通管式抽油泵已不能满足增大提液量的需要 ,而目前采用的电泵存在着耗电量大、成本高的问题 ,因此 ,2 0 0 1年初引进了大排量螺杆泵及配套工艺技术。该技术在大港油田高含水、出砂油井应用 ,目前已经形成了油井优化设计、检测、杆管防断脱、扶正工艺以及诊断等配套技术 ,通过现场应用在提液增油、延长检泵周期、降低能耗、恢复长期停产井生产等方面 ,取得了突出的效果。     

SO2风机的运行与维护

描述了SF01－14A型离心式风机在闪速炉炼钢工艺中应用的特点，介绍了该风机运行与维护的经验。     

2000t快锻机的在线监测与维护

结合生产实际，介绍２０００ｔ快锻机液压传动系统的组成和工作情况，并从信号检测，计算机数据采集和处理等方面介绍快锻机在线监测的设计和使用情况。最后从信息构成、知识综合和量化分析讨论监测技术在设备中的作用     

中兴接入网维护管理系统

本文首先说明了接入网网管的重要性及其一般功能结构,然后较为详细地介绍了中兴接入网网管系统的结构模型、系统设计和管理协议栈,最后介绍了中兴接入网网管系统的主要功能。     

移动通信光传送网及其维护管理策略

光传送网是移动通信的基础网络 ,它的质量直接影响到移动通信网络的正常高效运行。对移动通信光络的组网特点进行了分析 ,并针对目前移动通信光传送网维护管理中存在的问题和应采取的策略进行了探讨 ,以供业界同仁交流和参考。     

基于多版本协同设计系统的对象标识机制

多版本技术通过对象复制来解决实时协同设计系统中的冲突操作的意愿保证问题。分析了多版本技术及其对象标识存在的问题，提出了一个对象标识模型，针对多版本环境对冲突定义进行了修改，并通过实例对该模型的正确性进行了验证。     

Applying RCM in large scale systems: a case study with railway networks

In 2000, the European Union founded a project named ‘RAIL: Reliability centered maintenance approach for the infrastructure and logistics of railway operation’ aimed to study the application of Reliability centered maintenance (RCM) techniques to the railway infrastructure. In this paper, we present the results obtained into the RAIL project, including a RCM methodology adapted to large infrastructure networks and a RCM toolkit to perform the RCM analysis, including cost aspects and maintenance planning guidance. This paper addresses the problem of applying RCM to large scale railway infrastructure networks to achieve an efficient and effective maintenance concept. Railways use nowadays very traditional preventive maintenance (PM) techniques, relying mostly on ‘blind’ periodic inspection and the ‘know-how’ of maintenance staff. RCM was seen as a promising technique from the beginning of the RAIL project because of several factors. First, technical insights obtained were better than the existing, so that several maintenance processes could be revised and adjusted. Second, the interdisciplinary approach used to make the analysis was very enriching and very encouraging for maintenance staff consulted. Third, using the RCM structured approach allowed to achieve well-documented analysis and clear decision diagrams. Our methodology includes some new features to overcome the problems of RCM observed in other projects. As a whole, our methodology and Computerized Maintenance Management Systems have produced two short-term benefits: reduction of time and paperwork because databases and tools are accessible through Internet, and creation of a permanent, accurate, and better collection of information. It will also have some long-term benefits: better PM will increase equipment life and will help to reduce corrective maintenance costs; Production will increase as unscheduled downtime decreases; purchase costs of parts and materials will be reduced; more effective and up-to-date record of inventory/stores reports; and better knowledge of the systems to help the company to chose those systems with the best LCC. The results have been corroborated with the application of our methodology to signal equipment in several railway network sections, as shown in this paper. Because of the successful conclusion of the project, the Spanish railway company (RENFE) and the German railway company (DB A.G.), not only decided to adopt RCM to enhance PM, but they have started a large project to implement Total Preventive Maintenance relying on the implantation of the RCM methodology.