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.

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