[PSUBS-MAILIST] hand pump

Fri Apr 8 09:18:56 EDT 2016

Hello i have installed on pilot fish a sarum hydraulics hand pump rated for
40 bar and with 100cc stroke, and a short and long handle depending on
depth. With materials and seals fit for sea water. Not very fast and Costs
over 1000 euros but very sturdy and saves lot of space and air over
classical hard ballast. I could add electrical pump later
Regards Antoine

On Friday, April 8, 2016, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Steve,
> Good points, I think I will make my own pump.  I can make the pump faster
> than a hydraulic pump by using a larger displacement  plunger but not so
> large that it is hard to operate.
> Hank
>
>
> On Thursday, April 7, 2016 7:36 PM, Stephen Fordyce via
> Personal_Submersibles <personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>> wrote:
>
>
> 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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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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