Is there any consensus on whether or not to use PVC or CPVC for air lines?
My compressor is capable of 150psi.
I already have copper for most of my distribution system but I need to add a
branch and the copper prices are profanity inducing.
...uh, so would you like to provide some context with that?
[I've got quite a few feet of PVC pipe in my drip system that I've bumped a
few thousand times and thus far, no shrapnel]
If you're gonna be dumb, you better be tough
Only if you fill the cavity with an explosive mixture.
Air pressure alone will not have that catastrophic an effect.
At worst, the 'shrapnel' will fall at your feet.
Hollywood has completely distorted the concept of 'explosions'.
Don't change the subject with 'high pressure gas cylinders'. Keep the
discussion at shop air pressures of max 150 psig.
And I know that a vessel with 3000 psig worth of steam can level a
generating station. Boilers can throw an entire ship in the air.....I
am talking about 150 psig worth of shop air.
I am talking about a garden hose and you're switching the discussion
over to the Hoover Dam bursting.
Find me an accident report. No explosive gasses.....air. 150 psig max.
> Only if you fill the cavity with an explosive mixture.
> Air pressure alone will not have that catastrophic an effect.
> At worst, the 'shrapnel' will fall at your feet.
BULL SHIT! !
> Find me one report/link to an accident that didn't involve air
> pressures greater than 150 psig or an explosive (oil) mixture.
Why would you expect to find reports of something that isn't done?
The very first listing from googling "shop air explosion" revealed one occasion
where 140psi of air was accidentally put in a truck tire which then exploded,
killing the worker. No explosive mixture... just air pressure less than 150
Compressed air is nothing to play with.
On Dec 6, 8:40 am, "Mortimer Schnerd, RN" <mschnerdatcarolina.rr.com>
That's not a shop-air explosion. That is an idiot overinflating a tire.
Using that barometer (I made a funny), I am sure there are many
Put 30 psi in your ears, and you'll get hurt. 5 psig through an
intravenous needle into your bloodstream and you're toast. How many
accidents have been reported where somebody has blown dirt into their
eyes? That happens all the time.
Compressed air can hurt you.
I want to see a report where it states that an air distribution line
exploded, pvc, copper. rubber... anything. My old shop has a large 3/4"
PVC airline distribution system. A dozen drops. Never had an issue for
20 years. Had a crimp come off a cheap airline once.. chased one of the
guys around the paintbooth real good.. he had some welts on the back of
his legs and a bruised ego..we had a huge laugh...(Could have been more
serious, we were lucky.. but you need full-tilt air to blow off dirt
With all due respect,
Had a crimp come off a cheap airline once.. chased one of the
which reminded me....
Same guy took a full swing with a #1 wood at a golf-ball in his tiled
33 cuts, 112 contusions and 44 lacerations.
Good thing his roommate heard the commotion and opened the door to let
the ball out.
If you hadn't found any such reports... it's because you didn't look. This is
the very *first* hit turned up by a Google search on
<"compressed air" pvc explosion>
Here ya go...
Doug Miller (alphageek at milmac dot com)
Of course he didn't look. He was hoping you wouldn't, either. Now he's
probably going to claim these don't count because the ambient temperature was
beyond parameters, or it was the wrong phase of the moon, or whatever.
You can rub this one all day but you can't put a polish on a turd. PVC line for
compressed gases is a dangerous game. Just because he's gotten away with it for
a lengthy period of time doesn't mean it's not ready to fail later today... or
tomorrow... with disasterous results.
With all due deference, the operating pressure of the exploded line was
not given. However, there is no reason for presuming that it exceeded
the pressure under discussion, either. Moreover, further down in the
page a restriction of 100 psi was imposed ... well below your postulated
One of the additional links DID relate specifically to shop-level
pressure and a couple of clearly dangerous failures.
ABS, apparently, ruptures. PVC, just as apparently, shatters rather
Under the banner of erring on the side of caution, would it not make
sense to eschew pvc in favor of one of the other, commonly used, materials?
Your pvc has flexed each time the pressure has changed. That's a lot of
cycles over the lifetime you told us about. The course of prudence would
be to at least shield it.
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