September 2012

Columns

HP Automation Safety: ‘Sticktion’: A dangerous failure mode

I set a wet glass on the old wooden kitchen table at our home. It sat there all night. The next morning, when I went to grab the glass, it stuck to the table. Yes, this event has happened before. But,..

Goble, W., exida LLC

I set a wet glass on the old wooden kitchen table at our home. It sat there all night. The next morning, when I went to grab the glass, it stuck to the table. Yes, this event has happened before. But, this time, it took a considerable yank to remove the glass from the wooden table. I do not know what type of finish was applied to this table; however, things do tend to “stick” to it. While visiting the maintenance shop at a refinery, I was asking about solenoid valve, actuator and valve failures. One of the maintenance workers jumped in and told a story. “If I don’t go out there and turn that hand valve once a week, no one will ever be able to turn it again.” This

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