[PSUBS-MAILIST] bilge pump

[Antoine Delafargue via Personal_Submersibles]

hi Hank,
In Pilot Fish I have a manual bilge pump from Sarum hydraulics, that gives
100cc per double stroke, against up to 40bar.
it is an oversized hydraulic pump from Oil and gas type of application,
highly corrosion resistant. quite expensive though (1000$)

at the pump intake I have a three way valve so I can take water either from
the 50Liters soft bladder VBT, or from the bilge (either aft or forward of
the sub)
at the pump outlet, the pipes and valves also branch out either to the sea
via through hull, or back to the VBT bladder.
This way it is possible to:
pump bilge water to the VBT bladder at near zero back pressure
pump bilge water to the outside
pump sea water from the VBT bladder to the outside.

regards
Antoine


On Wed, Dec 6, 2017 at 1:50 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
> Your idea to be able to pump leaked water out through the hull is pretty
> interesting.  Where did you find a 36v dc pump?  Maybe I am overthinking
> the idea.
> Hank
>
> On Tuesday, December 5, 2017, 9:09:19 PM MST, Alan via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> no not a DSV. I have forgotten the lpm rate, but not high.
> The pressure is 650psi so it can easily operate at my maximum depth of
> 500ft.
> The intention as a bilge pump was to just act as a hand held suction hose
> to mop
> up any wash that may come in, & comply with G.L. I am not planning on
> major leaks!
> I am wanting 2 solenoid ballast valves (inlet & outlet) to work in unison,
> mainly so
> I can ride a bit higher while towing, as the inlet valve will stop the air
> in the tank
> compressing, & also as a safe guard if the sub is left floating in the
> water for
> long periods of time.
> Alan
>
>
> Sent from my iPad
>
> On 6/12/2017, at 4:28 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> That will be a pretty slow pump, good for deballasting but not so good if
> you have a leak at the surface and want to save the sub.  So your new sub
> is going to have sealed ballast tanks?  interesting.   Hmmmm that makes it
> a DSV ;-)
> Hank
>
> On Tuesday, December 5, 2017, 5:37:01 PM MST, hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi all,
> Do any of you sub owners have bilge pumps?
> Hank
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