[PSUBS-MAILIST] VBT Pump

Wed Aug 16 12:36:45 EDT 2023

 A bronze Oberdorfer gear pump is pretty much bulletproof, and the 2000 series will give you an advertised 2.2 gpm at 1800 rpm (they specify .68 hp for the motor). Same pump Kittredge recommended. It would take a little poking around to insure sufficient psi at the output to deliver that flow rate against external pressure. A K350 at 350 fsw, for instance is what, 160 psi, give or take? Vance

    On Tuesday, August 15, 2023, 05:42:23 PM EDT, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Alan, karcher water pump is very low lpm  I am wanting 40 lpm at 200 psi for
1.5kw motor at 1800 rpm.
Pump hp simple calc = rpm x 15/63000+psi x gpm/1460  
I am wanting to know if anyone has actually done it with a pump for VBT and
what works best.  As back-up I have air but my VBT tanks are 40 ltr each
fore and aft.  Vance? Any comments? 

-----Original Message-----
From: Personal_Submersibles <personal_submersibles-bounces at psubs.org> On
Behalf Of via Personal_Submersibles
Sent: Monday, August 14, 2023 8:18 PM
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Subject: Personal_Submersibles Digest, Vol 120, Issue 34

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Today's Topics:

  1. Re: Air Comp (via Personal_Submersibles)
  2. Re: Air comp (hank pronk via Personal_Submersibles)
  3. Re: FW: VBT pump (Alan James via Personal_Submersibles)

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Message: 1
Date: Mon, 14 Aug 2023 10:56:09 +1200
From: via Personal_Submersibles <personal_submersibles at psubs.org>
To: <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Air Comp
Message-ID: <014f01d9ce39$5b6406c0$122c1440$@gmail.com>
Content-Type: text/plain;    charset="us-ascii"

Regarding hose/tube I have found that there is a DN2 hose 1/12" ID nom.
(.083" 2.1mm) WP 630 bar which is 0.2" OD (5mm OD) that is really good for
so many purposes as it has low volume for air comp, easy to bend in tight
places etc etc.  We used to use 3/16"  5,000 psi but in many cases we have
changed over.  Chs, Hugh. 

-----Original Message-----
From: Personal_Submersibles <personal_submersibles-bounces at psubs.org> On
Behalf Of via Personal_Submersibles
Sent: Sunday, August 13, 2023 5:07 AM
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Subject: Personal_Submersibles Digest, Vol 120, Issue 30

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Today's Topics:

  1. Re: Air comp (Rick Patton via Personal_Submersibles)
  2. Re: Air comp (Cliff Redus via Personal_Submersibles)
  3. Re: Air comp (Cliff Redus via Personal_Submersibles)

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Message: 1
Date: Sat, 12 Aug 2023 09:29:45 -0700
From: Rick Patton via Personal_Submersibles
    <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
    <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Air comp
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Message: 2
Date: Sat, 12 Aug 2023 17:06:46 +0000 (UTC)
From: Cliff Redus via Personal_Submersibles
    <personal_submersibles at psubs.org>
To: hank pronk via Personal_Submersibles
    <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Air comp
Message-ID: <723664355.3647360.1691860006286 at mail.yahoo.com>
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 That's interesting.? I calculated you would I would go from 3000 psig to
2,832 psig from a 80 scf tank at 400 feet for four MD-101 thrusters alone.?
2,250 is a bit lower than expected.? Are these MK 101's ?? Are you using the
air in this scuba tank for anything else?? My calc does not take into
account tubing connecting the regulator to thrusters.? How many liner feet
of tubing do you have and what size?
Best

    On Saturday, August 12, 2023 at 10:47:16 AM CDT, hank pronk via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Cliff, the pressure in my 80 cu tank dropped to 2250 from 3000 to supply
the 4 motors to 400 feet. ?Hank

Sent from my iPhone

On Aug 11, 2023, at 7:51 PM, Alan James via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

?Thanks Hank, look forward to any videos.Alan

Sent from Yahoo Mail on Android 

  On Sat, 12 Aug 2023 at 1:41 pm, hank pronk via
Personal_Submersibles<personal_submersibles at psubs.org> wrote:
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Message: 3
Date: Sat, 12 Aug 2023 17:07:06 +0000 (UTC)
From: Cliff Redus via Personal_Submersibles
    <personal_submersibles at psubs.org>
To: hank pronk via Personal_Submersibles
    <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Air comp
Message-ID: <1423558626.724066.1691860026585 at mail.yahoo.com>
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 Excellent!
Cliff
    On Saturday, August 12, 2023 at 10:53:29 AM CDT, hank pronk via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Also to confirm, all four motors are water free.?Hank

Sent from my iPhone

On Aug 11, 2023, at 7:51 PM, Alan James via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

?Thanks Hank, look forward to any videos.Alan

Sent from Yahoo Mail on Android 

  On Sat, 12 Aug 2023 at 1:41 pm, hank pronk via
Personal_Submersibles<personal_submersibles at psubs.org> wrote:
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Message: 2
Date: Sun, 13 Aug 2023 23:06:49 +0000 (UTC)
From: hank pronk via Personal_Submersibles
    <personal_submersibles at psubs.org>
To: David Colombo via Personal_Submersibles
    <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Air comp
Message-ID: <214124219.3977766.1691968009548 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

 David, I will send you pictures of the system connections on FB
messenger.Hank
    On Sunday, August 13, 2023, 04:38:01 PM MDT, David Colombo via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank do you have a diagram on your air comp system you could share. I'm
adding external hp air tanks to the VAST and trying to figure out the
plumbing and where the second stage reg would be located.David On Sat, Aug
12, 2023, 8:47 AM hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

Cliff, the pressure in my 80 cu tank dropped to 2250 from 3000 to supply the
4 motors to 400 feet. ?Hank

Sent from my iPhone

On Aug 11, 2023, at 7:51 PM, Alan James via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

?Thanks Hank, look forward to any videos.Alan

Sent from Yahoo Mail on Android 

  On Sat, 12 Aug 2023 at 1:41 pm, hank pronk via
Personal_Submersibles<personal_submersibles at psubs.org> wrote:
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Message: 3
Date: Mon, 14 Aug 2023 08:17:23 +0000 (UTC)
From: Alan James via Personal_Submersibles
    <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
    <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] FW: VBT pump
Message-ID: <501348157.4080278.1692001043729 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Hugh,Years ago I bought a Karcher 36V battery powered car wash water blaster
with a piston pump that is touted as being corrosion resistant.I think the
pressure was 750psi.I saw this item with a higher psi but not sure if its
corrosion
resistant.https://www.kaercher.com/int/overview-battery-products.html
It may be a product you mightn't have thought of.Ali may have the pump for
this unit.Alan?

Sent from Yahoo Mail on Android 

  On Mon, 14 Aug 2023 at 9:58 am, via
Personal_Submersibles<personal_submersibles at psubs.org> wrote:  
Hi Guys

 ?

What make of pump is best for VBT water transfer in/out for 250 psi 1.5 kw.

I am looking at a gear pump 1.5kw Oberdorfer 944 Bronze.? These are only
rated for 10 bar.? I tried an hydraulic gear pump 30cc where I had a
stainless and bronze gear set made up but the aluminium body corroded form
the trials and I just found that they had used steel backed sleeve bearings.

 ?

Regards,

Hugh
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