The pressure cooker is a needed part of the bomb. The pressure relief
If that was the case, it would amount to a shaped charge, pointed
As to the context of our discussion, a 13-20 gallon compressor bursting
from over pressurization isn't going to take off any legs or arms, let
alone kill anyone.
These "pressure cooker bombs" seemed to do quite a good job at it,
"Playing is not something I do at night, it's my function in life"
It's very rare for an air compressor tank to violently explode. In cases
where it did happen, usually there was defective construction, the
the compressor had been modified, relief valve stuck closed, etc. A
rusty tank will almost always fail with a pinhole leak or small crack.
I would turn the compressor upside down and tap all over the bottom with
a small hammer. You will hear or feel any thin spots.
You could also have it hydro-tested. This is a requirement for
industrial pressure vessles over a certain size in most states but
perhaps you could find someone willing to test your small compressor the
same way. I think you could do a fair job of testing it yourself by
filling the tank with water and then pressurizing it to about 10% over
it's nominal pressure rating. Personally, I would be satisifed with the
Better to be stuck up in a tree than tied to one.
Larry W. - Baltimore Maryland - lwasserm(a)sdf. lonestar.org
I would believe that the question is not how much water or how much
rust, but what is the remaining thickness of the metal making up the
tank. If the tank has sit for years has the bottom nearly rusted through?
If it rusted and significantly decreased the thickness of the tank wall
is it general or is it such that when it fails it will pin hole and leak
slowly or fail catastrophically.
I have never seen a tank fail, but.................
I saw one failed intentionally on TV. I think it was Time Warp where
they dropped a 5 or 10 gallon tank off a building on to a spike. Big
noise, lots of pressure released, and the tank went flying. Very fun to
According to the inspector that does out tanks at work, they pin hole
rather than explode. In MA, tanks have to be inspected every two
years. They use an ultrasonic thing and it gives the wall thickness
and can be done while running.
When there's a lot of water in the tank, "hadn't been used for years" is waaaaay
"used it every week".
Water, by itself, doesn't cause rust. For iron to rust, two things are
necessary: water and
oxygen. Once all the oxygen in the tank has been converted to iron oxide, there
will be no
Case in point: hydronic (hot water) heating systems -- such as the one in my
typically have cast-iron boilers, and many (mine included) have cast-iron
radiators as well.
Water normally sits in these systems for *decades* without any damage to the
components. Yes, there's some rusting internally, but not much. Once the small
dissolved oxygen is used up, the rusting process stops.
Indeed it is. But the water sits there longer, too. The point remains that once
the oxygen in the
system is used up, no further oxidation (read: rusting) can take place unless
fresh oxygen is
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