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Re: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT) knowledge)

To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT) knowledge)
From: "Dan H." <jmachine@adelphia.net>
Date: Wed, 5 May 2004 20:01:08 -0400
References: <BAY7-F34k43hxabH313000023fd@hotmail.com>
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
Pierre,

So then your soft tanks aren't really soft are they?  You realize that you
can't keep air in soft tanks and control your dive right?

Dan H.
----- Original Message -----
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, May 05, 2004 10:39 AM
Subject: Re: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT) knowledge)


> Thanks Dan!
>
> So basicaly it's very similar to a soft tank but with a valve at the
bottom
> (drain). My soft tanks are already configured that way but for another
> reason (so I can keep some pressurized air inside the tanks if I need it
to
> resurface if I run out of air...) but I think I might built a VBT and use
> electric/pneumatic valves so it could be easy to adjust the bouyancy with
> small push from button... And also, it might be a good idea to always have
> the VBT at ambient pressure. It could be easyer to adjust.
>
> As for the hatch seal, I must confess that my hatch is not as flat as I
> would it to be... I discovered that when welding, things tend to bent
every
> direction they want! And the hatch as a complex shape. Also, The "flat"
area
> is a square tubing of 0.125" thick wall... Not sure I can groove it. But
> thanks anyway! It is not that big a problem for me...
>
> Pierre "VBT man" Poulin
>
>
>
>
> >From: "Dan H." <jmachine@adelphia.net>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: Re: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT)
> >knowledge)
> >Date: Wed, 5 May 2004 08:24:37 -0400
> >
> >Brian,
> >
> >The VBT has two connections attached to it.  One is a one inch pipe that
> >water moves through and the other is a half inch pipe that air moves
> >through.
> >
> >The water port is located at the rear of the tank (not important) and has
> >an
> >internal elbow and pipe that goes to the bottom of the tank, so when
> >reducing ballast, it drains clear to the bottom.  The smaller line in
> >located at the top of the tank so when reducing pressure, it vents out
air.
> >
> >The water port has a one inch ball valve attached to it after it exits
the
> >tank.  This is controlled from the pilots seat through linkages that pass
> >through a thruhull fitting.
> >
> >The air port is plumbed directly into the sub and then to two valves near
> >the pilot seat.  One of these valves allows you to blow air into the
> >ballast
> >tank to pressurize it.  The other valve is a vent valve that connect to a
> >vent thruhull in the top of the hull. This valve allows you to bleed off
> >pressurizes air from the MBT to allow water to enter the water port.  To
> >allow water to fill the MBT properly, this venting system must be located
> >above the top of the MBT.  My vent is located just forward of the conning
> >tower in the hull.  An added advantage is that you can see the air
venting
> >through a viewport.
> >
> >To decrease buoyancy:  (go down)
> >Open the vent valve.
> >Open the water valve.
> >When neutral buoyancy is reached close off both valves and power down
with
> >the thrusters.  ( Of course if you go to negative buoyant, you can just
> >sink
> >downward.)
> >
> >To increase buoyancy:  (come up)
> >Open the air pressure valve to charge the VBT above ambient pressure.
> >Open the water valve.
> >When you hear air blowing out the water port, the tank is empty and you
can
> >close all valves.  (If making a miner adjustment to the positive,
> >pressurize
> >and then just crack the water valve a bit until you reach the desired
> >buoyancy.)
> >
> >I hope this helps!
> >
> >Pierre,  Your hatch seal really isn't a difficult problem.  There is no
> >need
> >to reinvent the wheel!  O-rings exist and they are perfect for your
needs.
> >A standard Buna O-ring, with a cross section of around .200 inch or more,
> >in
> >a groove within two flat matting surfaces is all you need.  Your "hatch
> >hold
> >downs" will apply all the force you need to compress the O-ring if your
> >mating surfaces are flat.  A 24 inch Buna O-ring is about $10.  Cheep,
off
> >the shelf and easy to replace anywhere if needed.
> >
> >Keep It Simple, Dan H.
> >
> >----- Original Message -----
> >From: "Pierre Poulin" <pipo305@hotmail.com>
> >To: <personal_submersibles@psubs.org>
> >Sent: Tuesday, May 04, 2004 9:49 PM
> >Subject: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT) knowledge)
> >
> >
> > > Hi Dan!
> > >
> > > I know that there is a Variable Ballast Tank in a K-350. And I imagine
> >that
> > > yours have one too.
> > >
> > > Could you please tell me how this VBT is connected? Valves, vents,
> >drains...
> > > I was planning to have a pneumatic cylinder and a piston to adjust
> >buoyancy
> > > using readyly availible ambient pressure but maybe a VBT is easyer to
> >built
> > > and could do the same job.
> > >
> > > I was thinking that we could use some pneumatic push button valves for
> >ease
> > > operation...
> > >
> > > Thank you very much!
> > >
> > > Pierre Poulin
> > >
> > > _________________________________________________________________
> > > MSN Messenger : discutez en direct avec vos amis !
> > > http://messenger.fr.msn.ca/
> > >
> > >
> > >
> > >
> > >
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References:
- Re: [PSUBS-MAILIST] To Dan H. (or anybody with VBT (MBT) knowledge)
  - From: "Pierre Poulin" <pipo305@hotmail.com>
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