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I found this post on rec.crafts.metalworking. Thought you guys might
find it of interest; at least as an anecdote.
Andy Cohen
.....................................................................
Bob Neidorff (neidorff@ui*.co*) wrote:
: What do you think of the idea of using a long 4" or 6" diameter
: steel pipe as an air tank?
In making any pressure vessel always hydrostatic test it before using
it.
Hydrostatic testing is no big mystery, just fill the container
completely full of liquid, attach a gauge and hand hydraulic pump and
apply at least 1.5 times the operating pressure. If it is going to
fail. it will only spurt a little liquid rather than spreading
shrapnel all over the place. Water is the most common liquid to test
with, though oil has been known to be used in certain applications
also. When filling the container, it must be completely full with no
air space inside. Sometimes the test can be done without a pump by
eating the container after filling it with a small torch to increase
he pressure by expanding the liquid thermaly. Care needs to be used
owever so you don't get too carried away with the pressure as when
doing this the pressure can increase rapidly.
Roger Mitchell
VP and Master Mechanic
Fort Collins Municipal Railway
Fort Collins, Colorado
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