I raise the question after an attempt my friend Bob made this weekend. He’s been working in his fathers print shop for the past few weeks, helping out during the busy holiday/post holiday color advertisement rush.
Now, alot of offset printing involves processing thin steel sheets with various solvents. These sheets are pretty big, and every color in a run (Cyan, Magenta, Yellow, Black, etc.) needs it’s own sheet, so there’s a whole lot of solvent around, and although the stuff is not like gasoline it can still be pretty volatile.
So, it’s the end of the day and Bob is given the task of emptying out the “bath”, a big shallow trough full of solvent. The task involves using a little foot operated squeezie thing to pump the dirty solvent from the bath into a barrel which is then shipped off somewhere to be reclaimed. It’s a dull, smelly, tiresome job. Bob starts to thinking and remembers the last time the shop got flooded. Why, they just yanked out the handy Black and Decker wet/dry Vac and sucked the water right off the floor! What a great idea! He could just suck the bath into the wet/dry vac’s bucket and pour it straight into the barrel.
I suspect you see where this is going.
“It seemed to be working great, right? But then the Vac’s chamber, it must have started filling with solvent fumes, and then the electric motor… well, I didn’t even consider that an electric motor might make sparks, because they run on magnets, right? Anyway, that’s about when flames start shooting six feet out the top like a nitro-burning funny car.”
So Bob thinks fast, kicks the vacuums away from the bath and yanks the power cord out of the wall. He grabs a fire extinguisher and hoses the vacuume down.
“I think that’s about when it exploded…”
It didn’t really explode, but some part of the overheated motor snapped with the sound of a gunshot when it was hit with the cold of the CO[sup]2[/sup] extinguisher, almost giving Bob a heart attack.
In the end everything was okay. Bob was unharmed and learned a lesson. I fronted Bob some cash until payday for a new Vac and got to hear this story. Bob’s Dad is none the wiser (though he might soon wonder why the Shop Vac is so clean). I suppose all’s well in the end.
I’ll get into my attempt soon enough.