Look at the photo. What do you see? I see a ball valve with:
- a valve body
- a ball
- a stem that can turn the ball
What are the high level potential failures for a ball valve?
- Stem stuck, can no longer turn (dangerous) …
exida explains Blog
Entries tagged with: Safety Automation Element List
- by Iwan van Beurden, CFSE
- Monday, July 22, 2013
- Certification
A Ball Valve with Safe Failures! Really?
- by Iwan van Beurden, CFSE
- Monday, July 29, 2013
- Certification
A Spring Return Scotch-Yoke Actuator with No Safe Failures! Really?
Look at the picture. What do you see? I see a spring return actuator with
- a diaphragm chamber
- a spring chamber
- the scotch-yoke mechanism
What are the high level potential failures for a ball valve?
- Scotch-yoke mechanism breaks, can no longer operate valve…
- by Dr. William Goble, CFSE
- Thursday, May 09, 2013
- Certification
Certificate Forgery!
exida has discovered yet another forged functional safety certificate. You can read about another occurrence in a previous blog entry.
The company name on the forged certificate is ISP SA DE CV, Cunduacan, Tab., Mex. How could someone…