[PSUBS-MAILIST] Sub hot water bottle.

Tue Sep 22 15:35:33 EDT 2015

Hi James,firstly, if you did go with the pr364, you need to buy the one with the relieving option.This relieves any overpressure that you will experience as you ascend & itkeeps the regulator at the set pressure above ambient.You would have a first stage regulator either on the tank or on the line to the regulators& that will give 130 psi above ambient. If you go to 500ft you will have 130 + 250 = 380psiwhich is 80psi more than it is rated for. But as the housing is under external pressure, itwill only really see the 130psi above ambient.Yes you could use a second stage regulator. I use octopus regulators on my ambient sub.They are cheaper & not so sensitive that they free-flow.I place them as low as possible as, if they are mounted high they won't give an overpressure.I also modified the exhaust valves by putting plastic tubes off them, so that the valve seals don'thave the oportunity of letting water in when they open. Another psubber had thought he was gettinga bit of water in the motor because of these valves.   With the pr364 you can dial in an overpressure. Most commercial compensating devices Ihave seen have an overpressure of about 4-5psi.Cheers Alan

      From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, September 23, 2015 2:53 AM
 Subject: Re: [PSUBS-MAILIST] Sub hot water bottle.

Hi Alan,I was just looking at that regulator.  It has a max inlet pressure of 20 bar.   Unless im missing something isn't a normal scuba regulator a better option? James

On 22 September 2015 at 09:53, James Frankland <jamesf at guernseysubmarine.com> wrote:

Hi Alan, Interesting idea.  Looks good.  I might put that on my list of winter modifications. Agree, the water bottle looks a bit amateur, but I think it will be ok and i'll hide it out of the way.   James
On 21 September 2015 at 21:05, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

James,Cliff is using this regulator as a compensating device.http://ph.parker.com/us/en/stainless-steel-pressure-regulator-pr354-pr364-series-miniature
I intend to use it also. You attach it to your air line & dial in your required overpressure.It has a hole in the handle spindle that enables the regulator to keep theset pressure above ambient & also exhaust any over pressure as you ascend.The idea is to mount it with the handwheel facing down to avoid any water getting in the system,& additionally as a caution run a tube down off it.You can either fill your motor with oil; in which case any oil expansion can run up the length oftubing from the regulator to the motor, or just air compensate.Untried apart from one dive by Cliff.Looks more proffesional than a hot water bottle:)Cheers Alan

      From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, September 22, 2015 1:31 AM
 Subject: [PSUBS-MAILIST] Sub hot water bottle.

This is my new bladder for the aft motor.  The old one was relying on the fuel bulb to act as the bladder, but I had the should provide a much better bladder.
The small wheelbarrow inner tube was an alternative idea.   RegardsJames

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