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RE: [PSUBS-MAILIST] Piping Advice

The HP approach works great, except it wasn't my idea, I borrowed it from Greg Cottrell!
 
I connect directly to the SCUBA tank with a yoke on a flexible HP hose. It's outside, the flexible hose goes to a through-hull, and from there on it's all SS Swagelok tubing. There are two such tanks, they have hull shutoff valves and an interconnect so you can blow any ballast tank from any SCUBA tank.
 
 
Thanks,

Alec


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From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland
Sent: Thursday, December 01, 2011 2:07 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Piping Advice

Hi All,
 
Thanks for the advice on the pipe work.  I think im going to make it more or less the same as the plans except put a manifold in place so i can pipe in 2 scuba tanks instead of 1.  I'll probably do some sort of linkage like Dan as well for that vbt valve which is in an awkward place, even for me.
 
Just one more question.  Is the system connected to the high pressure side of the 1st stage or one of the low pressure ports?  I remember reading this was a problem for one of Kittrege's clients who was unable to blow ballast at depth as the 1st stage could not produce enough pressure to overcome the water pressue on the check valve outside.  So i assume its the high pressure port to use.

I like Alecs idea of using the needle valves and pipe directly to the tanks with the contents gauges in line.  Does this work ok alec?  Do you use a scuba first stage or connect direct to the tank somehow?
 
Kind regrards
James

On 1 December 2011 04:36, Jon Wallace <jonw@psubs.org> wrote:

No batteries with the 600 Dan.  That doesn't surprise me since it wasn't used for quite a while and if George had batteries they were probably thrown out when the house was sold.

Jon



On 11/30/2011 6:51 PM, Dan H. wrote:
Jon,

My linkage is in two parts.  My VBT water valve is located as it is on the prints.  I go 90 degrees around the hull with two different links. The first link goes from the valve to a bell crank type arm on a pivot about 45 degrees up the hull then a second link goes from another point on the bell crank to the handle.

My battery pods are sealed so I can't get at the batteries.  I thought I had an old one around here but couldn't find it.
Sorry but I can't remember what number battery I used.  If you just measure the room you have available and talk to a battery guy they'll find something that fits the space.  Weren't there any batteries in the sub when you got it?

Dan H.




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