Posted By fats van den raad
Not accident related, but still indicative of how managers sometimes think (or not)
In a previous life I was an instrument technician for a largish chemical company. On one of our plants we had gas fired furnaces that was situated in their own rooms on the ground floor of the plant, along with all the relevant control instrumentation. In addition, there was also a stop/start facility for the furnaces on the first floor of the plant, remote to the furnaces.
I got called out one night because one of the furnaces had tripped out and the operator was unable to re-start it. The SOP at the time was for them to try re-start 3 times, and then to call us out if still unsuccessfull. When I got to the plant, i went to the furnace room and successfully started the furnace on my first attempt.
This same scenario happened on a regular basis over the next few months. This really intrigued me, and I started to systematically investigate the root of the problem, without any luck. The controll system was quite old, and I even started to systematically replace instrumentation and rewire the furnace in order to resolve the problem, again with no luck. A few weeks later I was working on an unrelated system on the first floor of the plant. I saw an operator come mooching down the plant, wiping his hands on a paper towel. He approached a "flip-top" type dustbin to throw away the paper towel, and I paid no further attention to him. The next moment an alarm sounded.... You guessed it, the furnace had tripped out again. I immediatly realised what the problem was that had haunted me for so many months. The remote stop/start control fr the furnace is situated aginst the wall directly above the bin. As the bin lid gets flipped open, the lid just lightly hits the furnace stop button. Because the button has years of accumulated dirt and residue on it, it does not jump straight back to it's original position, but slowly works it's way back over 30 minutes or so. This is why the operators were unable to start the furnace, but when I got there 30 minutes or so later, it started with no problem.
I immediatly went to the operation manager's office to tell him about my discovery.
"John" I said, "you know that furnace problem I had been working on, well I solved the mystery" I explained to him what the cause of phantom trips was. To my astonishment he replied, with all sincerity and seriousness." Well, you'll have to move the stop/start station then!!!" I just stared at him in total disbelief. "what about we just move the bin?" I asked. He looked at me blank for a bit, then said "Yeah, I suppose that would work as well!!"