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Re: [PSUBS-MAILIST] O rings and pressure
I was assuming Brian was going to have his HP tanks inside the sub. It
seems like the majority of people are afraid of the tank releasing all of
its air inside the sub. This is one of the areas where it is a matter of
opinion and the relevance of safety can be discussed endlessly with it
canceling it self out of the discussion.
I would put them in the sub.
If you put the tank(s) in the sub make sure you have an altimeter (which
you would want anyway), this way if there is a slow leak in a connection
you will detect it. Make sure you select a tank size that will accommodate
your volume-pressure calculations; if the tank were to release all of its
volume into the sub your atmosphere should not exceed 2atm. If this were to
happen to someone, they should sell there sub. Just kidding, just turn off
the tank, switch to your backup or tighten the connection. There is no need
for a regulator; the desire to limit flow can be taken care of by the type
of valve you use to blow your tanks (not the valve on the tank). This
simplifies everything while allowing you more control, with flow and the
system. Sub weight increase (minus the buoyancy of your tanks if out side)
so that could be a disadvantage forcing you to toss some lead out or
increase displacement. Having another hole in your sub to control the valve
or having a normally closed solenoid works but is a more expensive route.
These points are but a few and are a matter of opinion based on what your
sub is going to do. What is important in not being biased right off the
bat, because you can overlook something that you might regret later.
Anyone ever torque a 1/4 in. steel rod to failure with your bare hands or
even with, let’s say, a 4 in lever arm? If you have to use a cheater bar in
your sub, something is too tight! There are higher grades of steel which
can reduce diameter also.
Adam
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