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RE: [PSUBS-MAILIST] HP Stop valve for gauges.

Hi James,
 
I would worry about the effect of a ballast blow on your depth gauge. In addition, my suggestion would be to put check valves directly on the through-hull of each MBT, rather than use a ball valve as indicated in your diagram. In effect, you then have automatic hull stops. I've found a through-hull such as would be needed for a depth gauge can be welded in with only a local touch-up required to the paint. But here's another idea... do you have a through-hull for an overpressure valve? I used to have my overpressure valve and depth gauge share the same through-hull.
 
Thanks,

Alec


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From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland
Sent: Monday, October 31, 2011 1:28 PM
To: personal_submersibles@psubs.org; member-forum@psubs.org
Subject: [PSUBS-MAILIST] HP Stop valve for gauges.

Hi All,
 
Can i ask people's opinion on this.  Due to an oversight on my part, i am missing a through hull for a depth gauge.
 
So, i have an idea.  I was thinking of putting the gauges on the same line as the HP air for the forward tank.  In this configuration.  See fantastic picture attached (i am at work so i only have microsoft paint).  Hope the pic makes it through.
 
The idea is i have the through hull, stop valve, t piece (or even a "Y" piece) leading to 2 x redundant chemical protected gauges on one "t" and on the other, the check valve followed by the hp air.  Easier to see in the picture. 
 
This should allow water to the gauges while not filling the whole line to the hp tank. 

The check valve is 400 bar with a cracking pressure of 5psi.
 
The only problem i can see is that when blowing air, it may interfere\damage the gauges?  Bearing in mind they are chemical protected so have a diaphram that will protect them from the water itself.
 
Unless anyone has any better ideas.  (I will have a normal diviers gauge outside, but i want proper gauges inside).
 
Thanks
James