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Joe,
What I was questioning is the need for a pressure
relief in a closed ballast tank where the tank is built strong enough to
withstand the system pressure. If your tank is strong enough to withstand
the system pressure, then it won't blow.
As was pointed out to me by Jay, it's still
possible to get a regulator failure, and unless the ballast tank was built to
SCUBA tank pressure, it could possibly be ruptured if that happened. Good
point. My sub is a one atmosphere design.
That is the one scary thing about an open ambient
sub. Then deeper you go the more air it takes not to go any
deeper. A situation that can be a runaway disaster.
I don't know about an ambient sub, but in my
one atmosphere, when diving, I keep my main ballast tanks totally full of
water , vents opened, and my main ballast tank, adjusted to neutral
buoyancy of the sub and all valves shut.
Dan H.
----- Original Message -----
Sent: Tuesday, February 28, 2006 10:00
AM
Subject: Re: [PSUBS-MAILIST] ambient
ballast control
Hi Dan,
Besides the uncontrolled expansion scenario Jay mentioned, if I
enclose the ambient tanks and wanted to go to the bottom to say 33',
would I not be obligated to ride with the vents open? That would preclude the
ability to add small shots of air, like a BC, because the vents are open.
So If I need to enclose the tanks in a better effort to tame the free
surface area of my design, then I need a way to remain open to the
outside. I think using the same flood ports failsafe open, might be an
answer...I need to look at this a bit.
Joe
From: "Dan H." <jmachine@adelphia.net>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject: Re:
[PSUBS-MAILIST] ambient ballast control
Date: Tue, 28 Feb 2006
08:15:56 -0500
Why would you need a relief valve in a ballast
tank if it is built to withstand the pressure of the system?
My Main ballast tanks are open bottom and don't
need a relief valve and my main ballast tank is built far strong enough to
withstand my 175 PSI system pressure. Unless your dealing with a
compressor that may not shut off and run to high, where is the need for a
relief valve?
Dan H.
----- Original Message -----
Sent: Monday, February 27, 2006 10:35
PM
Subject: Re: [PSUBS-MAILIST] ambient
ballast control
Rick,
"you must have a relief valve in any
tank"
Hmm, a bit of a detail there I could previously
overlook with the open bottom.
I have to give this little problem of "free
surfaces" and possible solutions with regard to my particular
scheme some more thought. The jury (pun intended) is still out on
this.
I went looking and found some valve sources.
Your input and ideas for you own application have been most helpful and
appreciated..thank you.
Joe
Joe
From: "rick miller"
<rickm@pegasuscontrols.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject: Re:
[PSUBS-MAILIST] ambient ballast control
Date: Mon, 27 Feb 2006
11:52:01 -0800
joe
you must have a relief
valve in any tank that you build that you dont want to blow up. check
that link below for a flood /relief valve that can be built scrap plate
and all thread rod.
rick m
---http://www.frappr.com/?a=myfrappr&id=386116--
Original Message -----
Sent: Monday, February 27, 2006
9:47 AM
Subject: RE: [PSUBS-MAILIST]
ambient ballast control
Rick,
My mistake. I was not clear in communicating what is on my
mind.
Here it is http://www.frappr.com/?a=viewphoto&id=269116&pid=1450694
As for cost, this submarine building stuff for any of us is
equivelant to climbing Everest. The risks and opportunity costs are
nearly the same, with the return on investment being exactly
equal , simply....personal satisfaction.
Nothing stupid about it.
I appreciate the effort
Joe
From: "rick miller"
<rickm@pegasuscontrols.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject:
[PSUBS-MAILIST] ambient ballast control
Date: Mon, 27
Feb 2006 08:31:03 -0800
hi joe.
i have given your
design some thought which means this post will probably be really!!
stupid.
design constrants
ambient design = the
stuff will get wet/ electric is bad or expensive
minimixe free
surface area in ballast tanks = no water sloshing around in the
tanks on the surface.
cheap = not everyone
hit the lotto last night
dependable = we
don't want to die, just are friends think so.
flood valves use a flapper design with
a rod throught the flapper held with a spring to act as a
overpressure relief valve. mount the hinge on the rear so water flow
will hold open incase of failure. control system manual psuh pull
rod and bell cranks to single lever, the relief springs will help
with the rigging here to rods will not have to be exact. just like
the overe presuazation valve one a boeing but the spring will be on
the outside not the inside with the controll rod going through the
flapper.
vent valves and blow
valves
run your vents to
the sail you can use pvc pipe due to low pressure and mount ball
valves there.
rick m a+p/ia
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