ABSTRACT
In oil and gas industry, the proper design, selection, and implementation of process control systems, shutdown, and instrumentation must ensure maximum possible safety of personnel, assets, and the environment, in addition to achieving maximum availability of the plant. This is a challenge, and more so in gas production and processing plants. For reneries and petro-chemical, any shutdown due to malfunction for various reasons, including failure of instrumentation and controls components also need to be avoided. But it usually has comparatively lesser repercussions since there are tanks upstream, intermediate, and downstream of the plant. However for gas producers and gas terminals, this could, in short course of time lead to shutdown of upstream wells and also leave downstream customers without fuel for their plants thus leading to forced shutdowns.
