posted by jmogBeing that I work on industrial furnaces (everything from designing them to retrofitting for lower emissions to troubleshooting/commissioning) I feel really bad for you.
I have been close a couple times when it comes to furnace explosions, even in the next building over when a hydrogen furnace exploded, but have avoided being directly involved in one so far.
I have been doing this for 20+ years and every trip to the field is serious business.
Stay safe.
They said had I been another 6 inches in front of the furnace the concussion would have killed me. Our furnace uses a combination of RX and natural gas during the cook time, then kicks into nitrogen for the last 2 hours to get rid of the flammable gas and make the furnace door safe to open. Turns out the technician that handles the recipes was clueless and cut the nitrogen time down to 10 minutes to try to cut costs. He neglected to inform anyone of this. So when the door opened all the natural and RX gas that was all pushed to the front of the furnace exploded as soon as it hit the flame screen.