Ok, I will build my pod with PVC. Now my question is: "If I
compensate the PVC pod with air and since there is an amount of air INSIDE
the battery case, will the battery case crack under preassure?"
----- Original Message -----
Sent: Tuesday, January 18, 2005 6:26
PM
Subject: Re: [PSUBS-MAILIST] Battery pod.
(question for Dan H.)
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
Bill Akins.
----- Original Message -----
Sent: Wednesday, January 19, 2005 7:03
AM
Subject: Re: [PSUBS-MAILIST] Battery
pod. (question for Dan H.)
Hi guys!
Well, it's not a matter of: is PVC better then steel... You see, I have
enough skills as a machinist to build the pod myself in steel at very low
cost. That is why i prefer steel. It's only a personal preference. That
said, the real question I have in my head is, will I crack my batteries or
not if i pressure compensate the pod? Be it in steel, PVC, wood, etc... My
opinion is that since the is an amount of air INSIDE the battery case,
I think the case will be stressed the same as if it was empty. And since
it's a square plastic box, the resistance is not too great.
I may be wrong. And I would love to be wrong. It would be much easyer
to pressure compensate the pod then build it to resist the pressure.
Anybody have a though about that?
Pierre Poulin
Québec Canada