That is one benefit of steel. It may rust, but it will develop a leak, a
thin section, usually the size of a dime, may blow through, but unlike
plastic, it will not explode under normal conditions. Rubber air lines are
the same way. they may split, but you don't get the flying shards. Metal can
also be inspected so there is some predictability that a tank may soon fail.
Inspection will reveal this both visually and even a simple tap on the tank
with a hammer will give a clue. Plastic is catastrophic, usually showing no
signs of impending failure.
High pressure steam is another story. The vessel can blow with force (I've
seen a brick wall taken out when the end of a boiler blew off) but the metal
itself it not nearly the problem of the hot vapor that is rapidly expanding.
Just because YOU can't duplicate the conditions leading up
to a catastrophic failure doesn't mean it doesn't happen,
Greg. You are so clueless! Your prideful attitude prevents
you from understanding something that you haven't witnessed
with your own eyes.
Dave, how can you continue to denigrate people - not to mention the
manner in which you do it - for whatever you've read in their remarks;
and then get so "that way" yourself when others do the same with
replies to your posts?
Everybody has the right to express their opinion, but most people here
agree to disagree in a civil manner. And you really are a part of the
discussions here. Wouldn't you like to be regarded with an improved
temperment by the group?
Please chill with the 'bad' behavior.
You'll be better for it.
go back and re-read his previous post, John. His attitude
was totally uncalled for. We have a long running feud. I
hadn't posted anything that drew his smart-assed comments.
So I called him on it. And if he does it again, I'll call
him on it again.
John Sellers wrote:
We do? Damn I missed it.
I only suggested this would be a good thing for mythbusters to try. They do
prove about half the "myths" are true.
Have you ever watched the show? If this is really what everyone says it is they
could show us high speed photos of the explosions and their test dummy getting
whacked again. They also use a lot of ballistic gelatin that shows the damage
projectiles inflict on soft tissue.
I never said this wasn't a real danger, only the results of one unscientific
test which I referred to as anecdotal.
I used to work at a place that had a 20 hp compressor and we piped the air with
2" PVC. Well after about 5 years we had some repairs done to the compressor,
and the mechanic warned us about the dangers of PVC, especially "old" stuff.
Within a few months, we started having trouble with a bunch of the joints
coming loose, and we repiped with copper. After seeing this, I would never
chance using it.
This particular setup probably won't get the darwins, at least right off.
After all, pvc shrapnel isn't too heavy. You will have to test the system
at a pressure greater than what you are likely to see in service. Your
safety margin is only a factor of 2. Can you move to schedule 80 pipe?
That tap is going to be a weak spot. If it decides it doesn't like it
there, it will leave the tank in something of a hurry.
I don't know if this is an acceptable setup. Given the effects of fatigue,
and the connections, I would have my doubts.
Thanks, Michael, et al. That's the kind of response I was looking
for. Reasonable, succint, informative.
I hadn't considered the deterioration issue, particularly from oil.
The reason for the post, originally, was that I had a chance to pick
up some 8" SCH 40 pipe for the right price, and figured that the air
tank idea was worth considering. Also, the 'hang it from the ceiling'
aspect is appealing. Well, back to the drawing board.
As for the rest of you, if I'd have wanted the abuse, I'd have stayed
home and talked to my mother in law.
I really don't think this would be enough for a Darwin Award
unless maybe you went an extra step or two and glued extra
shrapnel to it like maybe screws, nails, shards of glass.
Then again, it could just be me.
You've made your case in this one statement, then go on with yada, yada,
Please, please, please! Go to
881 hits regarding PVC(a few NOT about compressed air).
How many times has this group gone over this same ground in the last year?
PVC is NOT repeat NOT suitable for compressed air!
The basic facts are that fluids under pressure and gases under pressure are
two different entities, and containment for one may not be good for the
The first myth of management is that management exists.
Catastrophic failure would be unpleasant. I asked in one of the physics
groups about energy storage in a compressed air tank. My 80 gallon tank
contains about the same amount of energy as a stick of dynamite.
There's a reason why no manufacturer makes a plastic pressure tank. Even
those "bladder" well tanks are metal.
...which isn't PVC either... Yes, fiberglass tanks are great, we use
them for our airpaks for the fire department. 2215 PSI rating, much
lighter than steel. Of course, they're 3 times the price, but when
you're carrying it around for 20 minutes, weight matters. For a
air storage you don't have to move around, steel is still cheaper.
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