April 2002

Valves/Heat Transfer

Stop welding on my valve

Bolt-on jacketing works in 95% of jacketed applications and eliminates risk of failure

Gaines, H., Controls Southeast, Inc.

Recently I saw a butterfly valve that had "torqued itself to death." Besides shutting down a sulfur recovery unit for days and endangering refinery output at a Taiwan refinery, the failure cost thousands of dollars in labor and replacement costs. The root cause was a poorly designed weld-on jacket that did not provide adequate heat to the bearing housing area and the adjacent process flanges. Sulfur condensed and froze because of the heat loss through those critical areas. Weld-induced distortion in the bearing housing area exacerbated the problem. When the valve actuator received the GO signal and applied power to move the stem, the disc would not budge. The result was inevitable.

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 }}