[PSUBS-MAILIST] pressure pump

[hank pronk via Personal_Submersibles]

 Brian,If your tank is full of water and you pump it dry, you will have negative pressure in the sub, but not much.  It should or might seal the hatch.    Hank
    On Wednesday, April 17, 2019, 7:12:43 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 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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