Welding a project in the shop. Had cleaned the tubing with two red shop rags, one with paint thinner, the other dry, to clean up. "Usually", I make sure to move this type of potential fire hazard out of the welding room.
This time I didn't. I put them on top of the vise on my cold-cut saw, which was on a roll-around platform about 18" off the ground. To gain some working room, I moved the saw out from its usual position to a spot near the door.
My typical welding outfit, summer or winter is RedWing pull-on boots, blue jeans, t-shirt and a Hobart welding jacket. If the welding is light, I use a pair of tig gloves. If heavy, a pair of lined gloves.
The project was a long frame for an above-the-garage-door shelf at my mother's house, and it stuck out of the door of the welding room into the shop proper. The last weld required me to squeeze into the door frame, standing right next to the cold-cut saw I'd relocated earlier.
As I'm finishing the last weld, I notice it's getting really hot all of a sudden. I'd been welding for a while, so it was already uncomfortable with the gloves, hood, jacket, etc - but this was HOT.
I look down and see a blaze basically at knee high, right on the saw.
I reach down with the gloves and pull the blazing rags off onto the floor and attempt to stomp out the flames.
Even my size 13 boots didn't have an effect - the mineral spirits were fueling the fire.
I reached down and separated the rags - now I've got two fires...
One does funny things when "more or less" insulated from getting burned - heavy-soled leather boots - cotton blue-jeans, welding jacket, welding gloves - all of that will burn eventually, but there's minimal risk of catching fire just by brief exposure.
There fire was contained to the rags, but it was burning aggressively - lots of smoke, etc. Didn't look like the fire was spreading and I didn't want to waste the fire extinguisher, so I rapidly went looking for the pump sprayer I keep handy for cooling welded parts and other duties.
Naturally, couldn't find the damn thing anywhere. "Where the f_ck is it!!!" I yelled more than once (note that I was alone in the shop...).
Tried the stomp it out trick again. I got the clean-up rag out, but it really didn't have much in the way of fuel. The other rag - no dice.
Finally grabbed a big trash can and used that to snuff out the flames.
stupid-Stupid-STUPID I though afterwards.
Went upstairs and put some water in a bucket - pulled all the scraps of what was left of the rags and dumped them in the water.
When I was coming down the stairs, I saw the spray bottle - right where I'd left it the day before...
Used it to spray down the floor in the wide area surrounding the scene of stupidity.
After it was all done, I noticed that I'd also left the quart of mineral spirits in the welding room - not terribly far from where the fire started...
Didn't burn up the saw, but the plastic guard that projects out from the motor below the handle was toast, and there was some small scorching of the plastic case on the armature. I intended to replace the plastic guard, but having used the saw without the guard, I can't tell that it was really doing any good at all, so it remains on a counter where I can see it on a regular basis to remind me how close I came.
I've since purchased a pump can (boy is that a neat tool!) after reading another thread here on the forum, and am far more careful to scan the working area before cutting, grinding or welding.