[PSUBS-MAILIST] Acceptable cabin pressure swing

Cliff Redus via Personal_Submersibles personal_submersibles at psubs.org
Sat Feb 27 10:07:09 EST 2016


Brian, see McMaster Carr part number 4620K41.  This has a 1 psi cracking
pressure, not 0.5 psi that I mentioned earlier.

Cliff

On Thursday, February 25, 2016, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Cliff,          Where did you find that 1/2 psi relief valve?
>
> Brian Cox
>
> --- personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');> wrote:
>
> From: Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>>
> Subject: Re: [PSUBS-MAILIST] Acceptable cabin pressure swing
> Date: Thu, 25 Feb 2016 19:05:00 -0600
>
> Jon for my boat, I have a pressure relief valve with a 1/2 psi cracking
> pressure to vent pressure while on the surface.  I have a high cabin
> pressure  alarm that triggers at 20 psia (5.3 psig) and a cabin lower
> pressure alarm set at 12 psia (-2.7 psig).   In the PLC I also record and
> display the cabin pressure at the time the hatch is closed and log all
> alarm states every second.
>
> I have never had either a high or low cabin pressure alarm while diving.
> I have had elevated cabin pressure caused by accidently having the backup
> manual O2 value open and a leak in an air fitting on anther occasion.
>
> Cliff
>
> On Wed, Feb 24, 2016 at 1:12 PM, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org
> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>> wrote:
>
>
> I think this is somewhat subjective but what is general consensus on
> maximum cabin pressure swing (higher/lower) relative to hatch closing at
> the start of a dive before setting off alarms?  My thought is that an alarm
> should sound well before any point of emergency.  I'm considering sounding
> a warning at 2psi +/- and an alarm at 4psi +/-  but I'm not sure if this is
> too strict.
>
> Jon
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