[PSUBS-MAILIST] High Pressure Pump

Tue Apr 25 20:03:44 EDT 2017

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 subsmaller than Cliff's R300.That 500 psi battery powered unit looks good Greg. I wonder if I couldput salt water through it though!I saw this marine pump that looks a good alternative if I can't find anythingin 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-/191830266640It 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/269411Perhaps 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

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
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

   _______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20170426/c3707f80/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image1.JPG
Type: image/jpeg
Size: 134266 bytes
Desc: not available
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20170426/c3707f80/attachment-0001.jpe>