[PSUBS-MAILIST] pressure pump

[via Personal_Submersibles]

Lot of trouble when your topside crew could just use a shop vacuum on a spare penetrator--pull the vacuum, close the valve, set the seats, and let it hold for a leak check--sounds like a good boat ramp pre-dive prep to meVance

-----Original Message-----
From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
To: PSubs <personal_submersibles at psubs.org>
Sent: Wed, Apr 17, 2019 9:12 pm
Subject: [PSUBS-MAILIST] pressure pump

Hi All,                       I have this little pressure pump for my internal ballast and I'm wondering if I could use it to pull a vacuum on my sub.  I was thinking it would be nice to do before I submerge, to seal the hatch.  The pump I have is a 100W  12volt pump that puts out 150psi and a flow of 8L / min.   Would I need to expel water to pull the vacuum?   My internal ballast is about 5 1/2 gallons .  Not sure if the pump would pump air efficiently.
Brian
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