From: highflyer <firstname.lastname@example.org>
Subject: Re: Paint Gun Danger
Date: Tue, 22 Sep 1998 10:25:40 -0500
Craig C. wrote:
> a bunched snipped....
> There is no reason to be using more than about 40 psi with any air
> powered spray gun. More than that pressure and all you do is maximize
> waste and overspray. My touch-up gun is rarely ever used above 25 psi
> and the big gun usually sees only 35-40 psi.
> 100 psi air from a very small orfice can cause air/fluid/particle
> injection though...
This is a real problem with the airless rigs. They eject the paint
at very high pressures, similiar to the output jet from a pressure
washer. Blocking the orifice with a finger to "clean" it can easily
High pressure hydraulics is serious. I remember one time in upstate
New York. We were inspecting a hydraulic system. There was a small
smear of oil on an elbow. One of the fellows casually wiped it off
with his thumb. His thumb instantly swelled up like a golf ball.
There was a pinhole through the cast fitting. When he wiped his
thumb across it, it filled his thumb with hydraulic oil.
When I was first learning about high pressure superheated steam
systems they had a demonstration that made a believer out of me.
They had a steam line well overhead with a series of pinholes in
it. They pressureized it with superheated steam. You could hear
it leaking. YOu could see a cloud of condensation forming about
six feet away from the pipe. You couldn't see a darn thing near
the pipe. The instructor took a two by four and swung it over his
head past the leaking steam pipe. It cut off the two by four!
I am very careful when I look for leaks in high pressure systems! :-)