[PSUBS-MAILIST] Penetrator Air Void Question/Concern

[via Personal_Submersibles]

If there is room for a 1/8" pipe nipple inboard, you could put a small pressure gauge on the panel somewhere. If you get an increase, it would tell you the outer seal leaked. That's the way we did it for the oil-filled space between double shaft seals at Perry. Don't see why it wouldn't work for this application, as well.
Vance



-----Original Message-----
From: Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Tue, Jan 31, 2017 9:51 am
Subject: [PSUBS-MAILIST] Penetrator Air Void Question/Concern

All, I am running a multi conductor cable (11-12mm OD) for my 12V stern thruster thru an existing 1/2" pipe nipple in the aft head of my K-250.

I am using a Blueglobe gland fitting (BG 220 VA, rated @ 1,160 psig) on the outboard pressure side of the nipple and a Conax gland (PG5-500-A-N,rated @ 800 psig) for the gland fitting inboard.

I was originally only going to have interior Conax gland and let the pipe free flood.  Then I decided I wanted to have redundancy and keep the pipe interior dry to help prevent corrosion (it is old school (not SS)). 

My question:  Is the air void that will exist between the 2 gland fittings a concern? Think empty pipe with both ends capped. I'm thinking not...


Thanks,
Steve
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