[PSUBS-MAILIST] asherRe: High Pressure Pump

Wed Apr 26 06:17:15 EDT 2017

Hi Psubbers,
Attached is the Karcher 36V battery operated 750psi pressure washer disassembled.
I ran it before pulling it apart. It moves about 10 litres of water in 2 minutes so
a bit on the slow side. It will be OK for trimming & pumping out any excess water
but if I wanted to use it to adjust the buoyancy by 30kg for a lighter pilot, it
will take me 6 minutes. It's noisy, a bit less than your normal electric pressure 
washer & probably bearable without ear muffs in the sub. It could be insulated.
It has a full power -economy & off switch. I don't know whats going on electrically
so will take it to the Karcher service centre & see what I can find out. 
I have a suitable speed controller & it may be as simple as getting rid of all
the wiring accept the red & black coming out of the motor & attaching to my
motor controller.
Alan

Sent from my iPad

> On 26/04/2017, at 1:57 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
>>> 
>>> Greg C
>>> 
>>> yardforceusa
>>> 
>>> 
>>> 
>>> 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
>>> 
>>> 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...
>>> 
>>> 
>>> 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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>> 
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