Lawrie,
Why use the K350 hull dim’s for a completely new sub? I think fitting a Diesel in a 900 mm dia. Hull is difficult. Maybe better go with 1 or 1,1 meter dia. Hull and 3/8” /10 mm shell
Mind that a flange brings a lot of extra cost/effort. I think that it is not really necessary for outfitting a small sub with relative big holes for the domes.
A 5 hp diesel can pass trough a 550 mm hole. Think I can fit a 150 Hp diesel trough the 820 mm bowdomehatch of Eurosub..
Regards, Emile
Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens lawrie-psubs@environics.com.au
Verzonden: vrijdag 15 april 2011 0:53
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] two questions, 1/8" or 1/2", and flange between K350 pressure vessels?
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
>
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************
Geen virus gevonden in dit bericht.
Gecontroleerd door AVG - www.avg.com
Versie: 10.0.1209 / Virusdatabase: 1500/3573 - datum van uitgifte: 04/14/11