You did not meet the criteria. You did not point to a situation where
the PVC pipe had exploded... it was a truck tire. The topic here is PVC
Having said that, I have discovered one of the errors of mine and that
is the air plumbing in the old shop is in fact ABS. My apologies.
I also read the other links that kind Wreckers have posted. I would
never even think of PVC in an industrial application. Service air
systems in my history have been driven by 100 HP rotary vane
compressors at pressures of 300 PSIG and higher. 4" lines are not
uncommon in power generation.
To be blowing craters of the dimensions stated in some of the reports,
one needs a whole lot more than a basic wood-workers' compressor.
Therefore the parallels are ridiculous.
Even though, in one of the reports it states "Gas Transmission and
Distribution Piping Systems Standard, limit the operating pressure of
plastic piping distribution systems to 100 pounds per inch (psi)",
which makes me think that PVC isn't as fragile as some think it is, it
obviously isn't worth taking a chance on PVC. I hereby retract my
careless endorsement of PVC and suggest we stick to copper, ABS or
other stuff I have never heard of before.
Lesson learned, ABS isn't PVC and you can't get anything past this
alert crew of wreckers.
Thanks for the corrections.
On Wed, 06 Dec 2006 08:40:18 -0500, Mortimer Schnerd, RN wrote:
Truck tire "explosions" are common--it's not the tire that explodes but an
improperly assembled rim that separates, and if one of the pieces hits
someone he generally gets hurt--truck wheels are rather large and the rims
are rather heavy.
If you are actually mounting a tire on a split rim you have the very real
possibility of the ring coming off and causing damage. Additionally it is
becoming less common to see split rim wheels and tires do explode when being
seated on regular one piece wheels.
Anecdotal only. My boss at my old job had a neighbor
who tired to inflate a space-saver spare tire to 32 psig
or so instead of the rated maximum.
It separated from the rim and the blast of air blew his
face off of his skull.
That's not a terribly good analog to the present discussion.
What size pipe is pretty important in this context.
IIRC, plastic soda-pop bottles are rated for about 150 psig.
So you could take a small one, put some vinegar in it and
then drop in some baking soda wrapped in wax paper,
screw on the cap and put it somewhere safe to see how
big a bang it makes.
Please note, this may be illegal in your locale. If that is
the case, don't do it.
> IIRC, plastic soda-pop bottles are rated for about 150 psig.
> So you could take a small one, put some vinegar in it and
> then drop in some baking soda wrapped in wax paper,
> screw on the cap and put it somewhere safe to see how
> big a bang it makes.
When I was a kid, would use a glass Mason jar, put in a rock for
weight, some carbide and water, then screw on lid and toss in the creek.
The carbide and water combined to produce acetylene gas which would
expand and cause the glass jar to burst while under water.
Any fish would float to the surface for easy pickings.
Old yes. Not rotten. The original ones were only to be inflated
to 12 psig or something like that. Accidents of the sort described
are why those are no longer available.
Memory dims but I think they were collapsible with the tire folded
into the rim.
The 2006 Porsche Carrera GT comes with a can of puncture fix. No spare.
Reason being, that there is no room for a spare..even a small temporary
one, but most of all there certainly isn't any room to put any of the
wheel/tires that would come off the car... even when flat. HUGE rear
wheels. (335/30 ZR20 got to get them 600 ponies to the street somehow,
Don't need no steeenking spares....
So use steel. Never, never, never, never use PVC/CPVC for compressed air. It's
been discussed here a number of times before. Do a Google Groups search on
this newsgroup, and I'm sure you'll find a few horror stories.
Doug Miller (alphageek at milmac dot com)
Sounds fascinating but I think I'll pass.
I considered black pipe but it's heavy, ugly, and a hassle to cut and thread
even though I have the required tools.
Over a hundred bucks for the copper choice but what the hell, it's only
Max (bemoaning the price of copper)
Neither PVC nor CPVC is considered safe for compressed air service.
This is according to both OSHA and the pipe manufacturers. There are
some flexible plastic products that can be used for air lines, i don't
know how they price compared to copper.
For every complicated, difficult problem, there is a simple, easy
solution that does not work.
I did my air in black iron pipe, mostly because of the dangers of
exploding PVC as already mentioned by other posters. In hindsight, I'm
wondering if I might have done better with PVC.
All of my lines are in the walls of my shop. There is 1/2 inch plywood on
one side of them and steel siding on the other. I'd do black iron pipe
where it came through the wall, but other than that the PVC would be
Anybody wager a guess if an exploding 1 inch PVC pipe could go through 1/2
inch plywood? The pipes couldn't be hit by anything, but summer heat
might soften the PVC to the point it would burst
And you are implying that there is something wrong with being lazy?
Besides allowing me to be lazy, the PVC would also allow me to be
cheap. Cheap AND lazy. Be still my beating heart ;-)
As you implied, I'm lazy. When friends drop by the shop, we drink
beer. Beer + whirling sharp things means missing fingers, which
is a shop verboten ("ten in, ten out" is written on the door).
Doubt if any of the beer swillers really give a damn what my plumbing is
like. Pneumatic plumbing.
True. But I spent better than a week cutting, threading and cursing that
black pipe. I could have done the PVC thing in a few hours. Could have
made a lot of sawdust in that week. If the heat caused a failure once in
10 years then maybe the trade off might be worth it.
Again, you imply being lazy, impatient and full of hubris is a bad thing.
Its worked for me for 45 years.
(what is really scary is I knew exactly what you were talking about without
even looking at that URL).
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