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Spraying Solvents: Risk Versus Reality

John_Moran's picture

Ref. article by Geoff Guzynski as On-line extra to Issue 230, he states that in 5 minutes of spraying he will move 1,000kg (a tonne) of air through his spray gun.

That seems an awfully powerful spray gun - at approx 1kg/m^3 air density, that is 200,000L/min ... how does he hold onto the gun?

Now if he was spraying water at a 1,000 time the density, maybe the figures work out, but not with air.

Unless I read Wikipedia wrong as well ...

Regards - John

roc's picture

: ) (post #170740, reply #1 of 2)

how does he hold onto the gun?<

Ha, Ha, Ha

That's awesome !  I am not going to do the math.  A little solvent goes a long way for me.  I don't need the head aches and general poisoning of my body.  Some like it though.

Risk ?  You mean like from a lacquer explosion or just that your kids won't recognize you because their brains stopped working cause they have to breath the stuff in the house ?

Don't take me too seriously I didn't read the article.


Give me six hours to chop down a tree and I will spend the first four sharpening the axe. Abraham Lincoln ( 54° shaves )

user-782372's picture

Dangerous Miscalculation? (post #170740, reply #2 of 2)

Given the subject (inflammability) this seems like a potentially dangerous miscalculation.

With a small fan in a booth like the accompanying picture, I could imagine a 1000 cubic feet of air in five minutes, but not 1000 kg. Since air is about 0.037 kg/cubic foot, the resulting concentration could be about 27 times higher with my assumed unit correction. But mine is just a wild guess. What are the correct units and calculation?