Tank for reply
Originally Posted by petersonra
I dont think it happen much, maybe once a 5 years even though we have huge amount of push button swich in our site.
I know voting scheme is not a best solution and cannot apply all of push button considering efficiency but it can be reduce failure rate.
As you mention above, we are trying to mitigate environment factor to push button, for example, exmergency stop switch is hard to do maintenace during normal operation.
More, if it' faiure could happen, we are going to lose alot of money on refinery plant characteristic.
If you have any experience with that kind of matter, I would love to share the best practice or let us know if you know where I can refe to code/standard.
I think if we apply voting scheme for pushbutton, we must set criteria up considering engineering effiency.
Please let us discuss and I want to be always with you as engineer.
Switch built to higher specifications sounds like a start, presuming you aren't already using what you have beyond it's design specifications. Most of the 30 mm switch designs seem to take more abuse then 22 mm switch designs when it comes to general purpose pushbuttons and their associated contact blocks.
Originally Posted by webfst