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Dear Pierre.
You said you never intended to go below 60 ft. At that depth you are not
even at two atmospheres of pressure. Don't just take my word for it, ask others,
but I assure you that at that depth and pressure you will not have any
problems with the thickness of a 10 or 12 inch pvc pipe. As you know I am using
a 12 inch pvc pipe for my battery pod. Even if I did not
pressure compensate my pod it would withstand less than two atmospheres of
pressure with ease. By pressure compensating it I just decrease the forces
against it
from the water pressure on the outside and help preclude any leaks, but I
probably wouldn't even need to do that at only 60 feet. Go to this ROV site and
post and ask
this question there. They helped me out a lot. Here is the
URL http://groups.yahoo.com/group/robotrov/?yguid=204005530
Bill Akins.
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