On 3 Oct 2005 17:43:17 -0700, with neither quill nor qualm,
quickly quoth:
Sorry, but Sched. 40 PVC IS NOT NOW OR HAS EVER BEEN RATED FOR GASEOUS
USAGE... Read the friggin spec before you spout off that it is
acceptable for usage in air service. PVC an CPVC are rated for
INCOMPRESSIBLE FLUID SERVICE ONLY. The pressure value thatis printed
on the side fo the pipe that you are lookig at is ONLY FOR WATER. Take
the time to use the pressure burst calculations for gaseous usage and
plug in the allowable stress for PVC and it will tell you differently.
If you run the calculations you will find that 1/2" PVC can SAFELY
carry something around 4...YES FOUR PSI.
I's tremblin', I is.
There are plastic pipe materials that are rated for gaseous usage, but
PVC and CPVC are not and anyone that uses them for air service has
basically installed a hair triggered bomb in their shop. When it goes,
and it's not a question of will it go, but when it goes, it will do so
violently and with all sorts of shrapnel that can do significant
damage.
Methinks you've taken this a wee bit OVERBOARD, C. Man, I'll bet you
even ground your PVC dust collector lines, don't you? titter
Do yourself a favor and Google the subject before you decide to plant a
bomb in your shop. If you go ahead and use PVC, tell us where your shop
is so that we can aviod coming anywhere close to it.
Wuss! I worked around it for several years with no mishaps. Flynn's
new body shop was built with 1.5" PVC pipe for air and had 25cfm going
through it for most of the day. A few times, guys caught their hose
on the cars they were backing out. The end of the pipe broke off with
the air hose attached. Nobody ever got hit by any shrapnel nor were
pieces found at the end of the day when they swept up. It was DAMNED
noisy, though. g
That said, I wouldn't plumb the shop with PVC now that I've seen the
OSHA letters where the Plastic Pipe Industry recommends against it,
but everyone should remember to wear goggles ALWAYS when using the air
hose, but that's mainly from blown debris. (It's awfully hard to do
good woodworking with only one eye.)
Read this and relax a bit, eh?
http://www.osha.gov/dts/hib/hib_data/hib19880520.html
P.S: Do I translate "cvairwerks" to "Corvair Works" properly? I had
a couple '62 convertibles and adored the little beasties. I took one
on flying jumps with my dirt-bike-riding friends.
--
"Most Folks Are As Happy As They Make Up Their Minds To Be"
-Abraham Lincoln
-----------------------------------------------------------
www.diversify.com - Happy Website Development