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Re: [PSUBS-MAILIST] Piping Advice



That's an interesting VBT arrangement and I never noticed that in the photos before. It looks like you changed the linkage under the hull as well since your VBT thru-hulls appear to be offset upwards on the hull rather than dead center in the bottom of the hull. By the way Dan, do you have a model # for the batteries you are using? I need a source.

Jon


On 11/30/2011 10:17 AM, Dan H. wrote:
For better access to my VBT valve, I used linkage that connect to the arm that you can see on my right hand side in pics of my sub "Persistence." As for the VBT, air supply, air vent and water in and out valve, they are controlled independently. What I added is a gauge to tell the pressure in the VBT. When fine tuneing the VBT it's good to know, before opening the water valve, if your going to push water out or let it in. The separate controls aren't a problem but the water inlet location on the original design is, and I'm no bigger then George was.

For air supply, I carry two tanks but only one is connected at a time. When I run low in the one I'm using, I crawl back and switch the connection to the other tank. I feel comfortable having that second cylinder in reserve, and switch out the empty as soon as possible so I always have a spare on board. It would be helpful to have them both hooked up so all you need to do is flip a valve to change from tank to tank but I preferred not to have a lot of high pressure piping in the sub. I use one first stage scuba regulator that connects directly to the tank. I guess you could use two of them but it's one more place for a leak.

Dan H.




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