[PSUBS-MAILIST] High Pressure Pump

Tue Apr 25 22:28:51 EDT 2017

A question for which I expect Hank probably has the practical solution...
The new Greg Principle (excellent!) that all things should serve at least
two purposes inspired the question. Could we not use such a little HP water
pump to drive a manipulator too?

:)

Alec

On Tue, Apr 25, 2017 at 9:57 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks Greg,
> I just bought the 36V Karcher pressure washer, 750 psi. I will post some
> pictures when I have pulled it to bits. The 36V battery is 2 Ah & may
> have use as an emergency back up battery for the subs life support system.
> I want to use the pump as a simple way of adjusting buoyancy for a
> wide range of pilot weights & as you suggest, utilising any space with
> contoured containers will be the way to go. I'm open to using flexible
> bags.
> I am not sure what the system on the Deep Worker is now, but it did have a
> soft tank system that was in the plastic seat. They would pump water out &
> in at the
> surface. The water filled seat proved to be a chilling experience & they
> moved
> away from it. I went with the high pressure pump mainly because there is a
> safety factor there if it happened to see external pressure. I haven't
> thought
> through this well, but it could be used like a hydraulic pump to activate
> external
> functions such as a buoy release mechanism or drop weight mechanism.
> Thanks for putting us on the right track.
> Alan
>
>
>
> Sent from my iPad
>
> On 26/04/2017, at 12:03 PM, james cottrell via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
>
> I think that you could run saltwater through any of these pumps as long
> as you flush them with fresh water after the dive.
>
> The great thing about pumping water out of a soft tank for small subs is
> that you can fabricate a tank out of plastics or fiberglass that will fit
> into an otherwise unusable space. Hard tanks take up a lot of room!
> Although its been years since my sub was underwater, it has a pair of
> crescent shaped plastic tanks which conform to the hull and double as
> seating. Everything should have at least TWO purposes! At first, I had a
> bronze rotary pump with a dc motor that pumped them out but after a while I
> just dumped the water overboard after the dive (the tanks were slender
> enough to get through the hatch).
> But much of your set up will depend on how you dive. Initially, I dove the
> sub negative and pumping water in and out seemed the way to go. Later, I
> started diving slightly positive and used a vertical thruster to control
> altitude over the bottom. After trying both methods, I think that a few
> ounces positive makes diving subs a lot more fun (and safer with better vis
> too). The pump is only needed as a backup if you get the buoyancy right at
> the surface. When its time to come back up, just turn off the vertical
> thruster and the sub gently heads back up! This is a good way to keep
> saltwater out of the pump!  Anyway, good luck with the build.
>
> Greg C
>
>
> ------------------------------
> *From:* Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Tuesday, April 25, 2017 3:44 PM
> *Subject:* Re: [PSUBS-MAILIST] High Pressure Pump
>
> Thanks Greg & Hank,
> size is a determining factor for me as I am building a one person sub
> smaller than Cliff's R300.
> That 500 psi battery powered unit looks good Greg. I wonder if I could
> put salt water through it though!
> I saw this marine pump that looks a good alternative if I can't find
> anything
> in the high pressure range. But it doesn't say you can run salt water
> through it.
> http://www.ebay.com/itm/12V-Seaflo-100-PSI-Water-Pump-RV-
> Boat-High-Pressure-Marine-Boat-4-Year-Warranty-/191830266640
> It is small, not much bigger than a 1 litre milk bottle (in picture)
> There is this 1600psi AC water blaster with a "corrosion free for life"
> pump.
> https://www.mitre10.co.nz/shop/karcher-k2-basic-
> electric-waterblaster-1400-watt/p/269411
> Perhaps I could replace the motor with one of my 2000W brushless DC motors?
> Attached photo is of a water blaster motor & pump I have, one of my DC
> brushless motors with key way & a 1 litre (quart) bottle of milk for size
> comparison. Although
> the water blaster is an AC unit, it has a universal motor & I have run it
> on 32V DC, but is very weak.
> Another thought was to pull apart the water blaster pump & hard anodise
> the
> aluminium pump body! Here we go again!
> Alan
> <image1.JPG>
>
>
> Sent from my iPad
>
> On 26/04/2017, at 12:46 AM, james cottrell via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Here's one that is 500 psi at 1 GPM-
>
> yardforceusa <https://www.yardforceusa.com/yf4050-bucket>
>
> Greg C
>
> yardforceusa
> <https://www.yardforceusa.com/yf4050-bucket>
>
>
>
> ------------------------------
> *From:* james cottrell via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Tuesday, April 25, 2017 8:37 AM
> *Subject:* Re: [PSUBS-MAILIST] High Pressure Pump
>
> Hi Alan,
>
> There are now some battery powered pressure washers that should work fine.
> Here's a link to one of them-
>
> New Hitachi Cordless 18V Pressure Washer - Tool Craze
> <https://toolcraze.net/new-hitachi-cordless-18v-pressure-washer/>
>
> New Hitachi Cordless 18V Pressure Washer - Tool Craze
> Before you had to choose between an electric plug in or a gas engine
> pressure washer. Now you have a third optio...
> <https://toolcraze.net/new-hitachi-cordless-18v-pressure-washer/>
>
>
> Greg C
>
>
> ------------------------------
> *From:* Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> *To:* personal_submersibles at psubs.org
> *Sent:* Tuesday, April 25, 2017 4:14 AM
> *Subject:* [PSUBS-MAILIST] High Pressure Pump
>
> Hi,
> I've been searching for a high pressure marine water pump over 500psi
> with view of using it on my trimming system & compensating system,
> but haven't had much luck.
> I want to be able to pump water out at 500 ft to adjust the buoyancy.
> The 500psi is for a bit of redundancy. An additional thought was that I
> could have a valve on it to operate a drop weight mechanism.
> Anybody know of any such animal in existence thanks.
> Alan
>
>
> Sent from my iPad
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