[Date Prev][Date Next]
[Chronological]
[Thread]
[Top]
RE: PVC
Would it be possible to extrude matching ID and OD PVC lengths and then
insert into one another and chem weld to spec? Maybe not as elegant as a
single thickness pressure tube, but maybe more doable.
Karl
SEDCO@prodigy.net
-----Original Message-----
From: VBra676539@aol.com [SMTP:VBra676539@aol.com]
Sent: Thursday, July 01, 1999 10:14 AM
To: personal_submersibles@psubs.org
Subject: Re: PVC
In a message dated 7/1/99 1:29:27 PM, fphillips5@excite.com writes:
<<Hi Vance and group, Regarding PVC crushing at 400 ft, I wonder what
company
draws huge PVC pipes in an extrusion method could just set their tooling
for
a 6", 9" 12" wall thickness and run a length of 20 ft or so at a 7 ft
inside
diameter. Then chem weld twin conical or hemispherical end caps at the
same
12" thinkness that fit it perfect compression tongue and grove joints and
also chem welded view ports. Seems as though the crush depth would be
good,
hull never rusts, easy to drill thru hull holes with extra PVC backing at
those thru hulls.
Then just use a very thick clear lexan viewing port(s) attached on the
outside of the PVC hull with a 2 in overlap on the outside and sealed via a
little o-ring groove and some mere location stainless small dia bolts. The
same end cap design could be used for a short tower with huge oversized PVC
hinges and stainless locks for a nice pilot access hatch also with viewing
ports.
Internal PVC bulkheads and stringers could also be chem welded as required
to give you a 100% margin over your reqired crush depth. All equipment,
ballast, motors, air and communications can be in smaller twin isolated
exterior pods that have the diving planes, propellers, etc. Does this make
any sense. Have at me men.
I'm not thinned skinned. F. Phillips
>>
I don't know anything about structure on poly materials, but suppose you
would be right about it. There is a PVC pipe manufacturer here in town who
is
a friend of a friend. I'll try to bubble the question up to him and see
what
he says. Maybe there's an easier way than retooling to make the big stuff
you
are thinking about. I've seen some pretty hefty pipe for water and sewer
lines, though. Maybe it's already available just waiting for some innovator
to jump in.
Some of the British 1-atm / 1-passenger workboats (Wrangler, maybe, and
Mantis?) had spun fiberglas hulls, I think. Seems like they had aluminum
endcaps in the stern and plexi domes for a bow, but don't quote me. I never
worked with any of them. Graham Hawkes designed these in the 70s and had
some
success for a while. He's a big believer in synthetics--witness his Deep
Flight. However, Phil Nuytton is building his vehicles in steel, which may
be
suggestive. Simultaneously (and at the same time) he (Phil) is also
developing composites for the Exo. Don't know what that means for the
pocketbook, but surely there is some hard data out there somewhere on these
materials.
Vance