[PSUBS-MAILIST] pressure pump

[Alan via Personal_Submersibles]

Brian,
you could just hook the pump up & see if you get much pressure with just air.
However you may need to then read the specs to see if it needs water running 
through it for lubrication or cooling.
I am not sure how much air you would need to pump out to give a sufficient 
Vacuum to set the hatch seal. Maybe that is the first question. 
If you know how much air you need to pump out then if you pumped out
water instead it would need to be the same volume.
Alan

> On 18/04/2019, at 1:12 PM, 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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