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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