英语翻译Selected results from control valve re-engineering proje

英语翻译
Selected results from control valve re-engineering projects carried out over the previous two years are summarized.These results support the idea that an engineered approach to control valve optimization is required to achieve the best performance for the current service conditions.Enbridge Pipelines Inc.operates a lengthy system of batched pipelines in North America that transport a broad range of liquid petroleum products.Ninety percent of existing pump stations employ pressure
control valves as the final control element.Pressure control valves in mainline service are typically over
12 inches in size.Due to the considerable capital investment associated with each control valve and
actuator installation,a strong incentive exists to maintain and optimize their performance.Another unique factor in pipeline engineering arises from pumping energy costs making up a significant portion of operating expenditures.Historically,this has led Enbridge to select control valves that are
“oversized” in comparison to industry norms.
Responsive and robust line pressure control in pipeline operations is essential for avoiding preventable
line shut-downs due to pressure excursions.Flexibility in pipeline operations requires frequent changes
in flow rates and delivery sites.These flexibility requirements,in addition to batch transport of widely
differing products,introduce significant performance demands on the entire pressure control system.
Control valve commissioning usually consists of specification of service conditions,control valve sizing
(by valve manufacturers),and field tuning of the controller during start-up.Closed-loop performance of
the valve will typically have been tested over a restricted operating range during this process.
The performance of control valves has received considerable attention over the past decade.Some of
the knowledge garnered from various industries,most notably pulp and paper,has been captured in
ISA/ANSI-TR75.02-2000 [1].A central idea is that good mechanical performance of the control valve
is essential to ensure good process control.
Enbridge’s experience is that several factors lead to pressure control system performance degradation
including:
• Inconsistent (nonlinear) response at different flow rates
• Changing service conditions
• Undocumented changes to the control system configuration or tunings after original
commissioning
In reviewing current pressure control system performance capabilities,a complete picture of all factors
must be assembled.Enbridge has adopted a systematic approach to analyze and optimize the
performance of existing control valves.The five main steps in this process are:
1) Conducting on-site control valve field tests.
2) Performing a simulation analysis of the control valve and its hydraulic environment.
3) Implementation and testing of settings derived from the field data and simulation analysis.

选择的结果,从控制阀重新设计项目进行了超过前两年的总结.这些结果支持这一想法,一个工程的方法,以控制阀的优化,需要达到最佳的表现为目前的服务conditions.enbridge管道公司设有一个冗长的系统batched管道,在北美,运输范围广泛的液态石油产品.90 ％ ,现有的水泵站聘请的压力
控制阀作为最终控制元件.压力控制阀在主线服务通常超过
12英寸的大小.由于相当多的资本投资相关的每一个控制阀
致动器的安装,强烈的动机存在,以维持和优化他们的工作表现.另一个独特的因素,在管道工程源自抽水能源成本作出了很大一部分营运开支.从历史上看,这已导致安桥选择控制阀是
“超大”在比较行业准则.
响应和稳健的路线,压力控制在管道业务是必不可少的,为逃避预防
线关闭下调,由于压力的远足行程.灵活的管道业务需要经常变化
在流率和交货地点.这些灵活的需求,除了一批运输广泛
不同的产品,引入显着的性能要求,对整个压力控制系统.
控制阀的调试通常规格的服务条件,控制阀上浆
（阀制造商） ,和外地的微调控制器期间开办.闭环系统的性能
该阀通常会已测试超过限制的经营范围在这个过程中.
表现控制阀已收到相当重视在过去的十年中.一些
知识的获得来自各行业,最显着的纸浆和纸张,已抓获在
isa/ansi-tr75.02-2000 [ 1 ] .一个中央的想法是,良好的力学性能的控制阀
关键是要确保良好的过程控制.
安桥的经验是,几个因素导致压力控制系统的性能退化
其中包括：
•不一致的（非线性）的反应在不同的流率
•不断变化的服务条件
•无证更改控制系统的配置或调音后,原
委托
在检讨现行的压力控制系统的性能,全面的了解各方面的因素,
必须组装.安桥已采取了系统化的方法来分析和优化
的表现,现有的控制阀.五个主要步骤,在这个过程中是：
1 ）进行对现场控制阀的实地测试.
2 ）表演了模拟分析控制阀及液压环境.
3 ）的实施和测试的设置来自外地的数据和模拟分析.