February 2002

Misc

Diagnostic alarm – to trip or not to trip

A number of requirements in the International Functional Safety Standard IEC 61508 sound as if an operating company must set up a safety instrumented system (SIS) to automatically trip the process whe..

A number of requirements in the International Functional Safety Standard IEC 61508 sound as if an operating company must set up a safety instrumented system (SIS) to automatically trip the process whenever a diagnostic fault alarm occurs. Many read this standard and think - no way! However, the diagnostic fault alarm does imply that the SIS is no longer capable of providing automatic protection. There is logic in thinking that the process should be shut down on such an indication. However, many do not set up their SIS that way. Why not? Are they wrong? When should "automatic shutdown" be used? The red light on the dashboard of my car came on this week indicating that there is a problem wit

Log in to view this article.

Not Yet A Subscriber? Here are Your Options.

1) Start a FREE TRIAL SUBSCRIPTION and gain access to all articles in the current issue of Hydrocarbon Processing magazine.

2) SUBSCRIBE to Hydrocarbon Processing magazine in print or digital format and gain ACCESS to the current issue as well as to 3 articles from the HP archives per month. $409 for an annual subscription*.

3) Start a FULL ACCESS PLAN SUBSCRIPTION and regain ACCESS to this article, the current issue, all past issues in the HP Archive, the HP Process Handbooks, HP Market Data, and more. $1,995 for an annual subscription.  For information about group rates or multi-year terms, contact J'Nette Davis-Nichols at Jnette.Davis-Nichols@GulfEnergyInfo.com or +1 713.520.4426*.

*Access will be granted the next business day.

Related Articles

From the Archive

Comments

Comments

{{ error }}
{{ comment.comment.Name }} • {{ comment.timeAgo }}
{{ comment.comment.Text }}