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Re: [PSUBS-MAILIST] Battery pod. (question for Dan H.)



Very true.  PCV must be protected from sunlight.  Some manufacturers add UV protection to their PCV but not for anything designed to be buried.  A coating of paint will greatly increase the life span.  If your going to compensate the pipe so that the shape no longer matters then you could heat it up to about 250 degrees, insert 4 steel pipes and with the help of a friend and a jig, you can actually stretch the round pipe into a rectangular tube.  
 
Fiberglass is a good approach too, but more expensive. I saw someone that bought their batteries, then taped the cardboard shipping boxes together and applied fiberglass over those. 
 
You will have to be creative when it comes to the end cap, but a flat metal plate could be held on by latches.
 
--Doug J
 
 
 
In a message dated 1/20/2005 10:43:19 AM Central Standard Time, MerlinSub@t-online.de writes:
If it is ten years old it breaks by just falling from the table.. no
real impact. Exact this was happen with a 10 years old PVC-endcap of a
thrustermotor of Sgt.Peppers. I purchase a new one and smash it against
a wall - again and again - nothing was happend. 

regards Carsten

Ian Roxborough schrieb:
>
> What happens to PVC when you hit it hard with hammer?
>
> If it's the same stuff I'm thinking of, it will crack.
>
> Ian.
>
> On Tue, 18 Jan 2005 18:26:46 -0500
> "Akins" <lakins1@tampabay.rr.com> wrote:
>
> > 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.
> >
> >
> >   ----- Original Message -----
> >   From: Marie-Andrée et Pierre
> >   To: personal_submersibles@psubs.org
> >   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
> >
>
> --
>
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