[PSUBS-MAILIST] hand pump

[Stephen Fordyce via Personal_Submersibles]

Hi Hank,
I reckon a hydraulic bottle or lever jack is something to start with, and
you'll struggle to get a hand pump that will do the sort of pressures you
want (ie. most applications for air are too low pressure, for hydraulics
are higher pressure, and not heaps in between).

But then the capacity of the hydraulic hand pump will be tiny and as was
mentioned, it's steel.  Might still be a good starting point for freshwater
use regardless, or to reverse engineer and make a stainless one.

Here's a thought experiment that may be useful:
If you have 1L of water that you want to move from inside the sub (1atm)
to outside (31atm at 300m water depth), that's equivalent in required
energy to pulling up a 1L bucket from a 300m deep well.  That's quite a bit
of manual effort just for 1L.  If it's 10L, well, screw doing that manually
I say :)

Cheers,
Steve

On Fri, Apr 8, 2016 at 11:16 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
> I need full depth pressure rating so I can sink fast without thrusters
> then pump out some water at depth to go neutral.   I can't wast air like
> Gamma because I have no onboard compressor.
> Hank
>
>
> On Thursday, April 7, 2016 5:42 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> why not use an electric pump used on boats & have valves to operate
> various other functions. They are reasonably small, 12V & built for marine
> conditions.
> Can't recall what psi they go up to, but saw some rated 130 psi.
> Cheers Alan
>
>
> ------------------------------
> *From:* Sean T. Stevenson via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Friday, April 8, 2016 11:18 AM
> *Subject:* Re: [PSUBS-MAILIST] hand pump
>
> I use these at work sometimes:
>
> http://www.enerpac.com/en-us/industrial-tools/hydraulic-pumps-and-valves/hydraulic-manual-pumps-0
> Don't know what they cost though.
> Sean
>
>
> On April 7, 2016 5:03:15 PM MDT, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,
> I am looking for a hand pump to remove water from my trim tank.  It will
> work like a DW.  I will empty the air out of the mbt and then flood a small
> plastic tank inside the sub.  Any ideas?
> Hank
>
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