Hi Alan,
Thanks for the link, will check out the doco. I have discovery channel
and keep an eye out for that type of show. Very interesting to learn what
is actually down there. Right title, aliens of the deep. I like the
concept of an ROV tethered to a submarine. Sort of like sending off a
blimp from the deck of a boat that hovers over to what ever your
interested in. Probably only need 60 foot of cable to do a nice 360 around
the submarine before moving on to the next location.
The design allows enough room below the pressure vessels to incorporate an
extendable boom, perhaps a forward cameria that can rotate downwards and
to the sides. The boome could extend out forward 10 feet and house side
scan sonar.
Originally I had two domes but I kept thinking about the amount of
freeboard and fingured it was nice to have an extra 12" to allow for water
running over the deck due to a wave over the bow in a moderate sea. Not
sure what sort of vision one gets from an acrylic cylinder as opposed to a
dome. Always the trade off going one way or the other.
Have two questions for anyone out there???
One I think it has come up a few times in the past. The drawings I have
for the K350 indicates 1/8" (6.35mm) obviously more weight using 1/2 and
one would have to increase the wall thickness of the end caps, but does
that really matter if the overall design of the boat allows for the
variation in weight.
Second question, you have two pressure vessels (K350) in laterial
alignment joined by a passaway with an inside diameter of 550 mm at 15 mm
thickness through the respective end caps... would it be best to have a
mid way flange arrangement with gasket to join the two pressure vessels
i.e. bolted together, OR let the passway cyclinder join them directly i.e.
no flange?
I see a lot of pressure vessels joined together around the oil refinery
where I work and they op for a flange arrangement but I figured this was
convenient for maintenance work. However, thinking about a 32 foot boat,
I wonder if the minute movements might create alot of stress of the welds
and that perhaps a metal gasket of soften metal is also a component that
allows stress to be tranmitted to the flange gap. Destressing would be a
matter of occassional dismentalling the boat and replacing gaskets.
Unfortunately my engineering degree was environmental and I only did one
year mechanical engineering and that was to build water treatment plants
not submarines with joined K350 pressure vessels.
Anyone with some technical knowledge, very much appreciate your opinions.
Back to the drawing board.
Cheers, Lawrie.
On Thu, 14 Apr 2011 21:10:50 +1200, "Alan James" <alanjames@xtra.co.nz>
wrote:
Hi Lawrie,
I have just recently watched the DVD "Aliens of the deep" wich is
more a documentary than
a film. It has a ROV that's tethered to a submarine. Great watching
for someone in to subs,
probably really boring for your average teenager. May give you some
ideas if you haven't
already seen it. I agree with Hugh re downward vision, but I guess
you could have a descent camera & screen
as a substitute if you are set on doing away with the dome.
How come you have a dome hatch & an acrylic cylinder hatch. Why not
do two domes?
Regards Alan
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