[PSUBS-MAILIST] hand pump

[Antoine Delafargue via Personal_Submersibles]

Hi hank
It is on the pilot fish project facebook page
Regards
Antoine

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

> Hi Antoine,
> Do you have a picture of the pump?
> Hank
>
>
> On Friday, April 8, 2016 7:19 AM, Antoine Delafargue via
> Personal_Submersibles <personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>> wrote:
>
>
> 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
> <javascript:_e(%7B%7D,'cvml','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> 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> 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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