Maximum pressure handled by a P-port

GKAM · 9th February 2008, 06:06

I hope the title is not too confusing…

Basically my question is if anyone knows the max pressure a Drager p-port system might be able to hold. P-port connections are made to operate at near-ambient pressure with minimal differential across sides. Has anyone ever tried to pressurize them?

I am thinking of making a calibration pot using air to check cell linearity before diving instead of pure O2. Air has a standard composition (dah) and there are no issues with flushing the system or wasting oxygen. The minimum pressure I will need is a bit under 5 bar but ideally I would like to push the system to just over 8 bar.

Will it go bang if I use P-connectors?

/GKAM

lizardland · 9th February 2008, 09:12

On my homebuilds I found that the joint between the p-port body and the counterlung material failed before the plug did. No idea at what pressure though. I'm sure it would be different if fitted into a solid material.

Tom Rose · 10th February 2008, 16:29

Quote: (Originally Posted by lizardland)

On my homebuilds I found that the joint between the p-port body and the counterlung material failed before the plug did. No idea at what pressure though. I'm sure it would be different if fitted into a solid material.

Last year I mounted a female "P" port in an ABS fitting to test my AERO 57 O2 sensors under 1 2/3 atmospheres of pressure. i.e. about 20 feet of water. The test was to determine if they were challenged.

The "P" port system held up just fine.

Tom

9th February 2008, 06:06	#1 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 250	Maximum pressure handled by a P-port I hope the title is not too confusing… Basically my question is if anyone knows the max pressure a Drager p-port system might be able to hold. P-port connections are made to operate at near-ambient pressure with minimal differential across sides. Has anyone ever tried to pressurize them? I am thinking of making a calibration pot using air to check cell linearity before diving instead of pure O2. Air has a standard composition (dah) and there are no issues with flushing the system or wasting oxygen. The minimum pressure I will need is a bit under 5 bar but ideally I would like to push the system to just over 8 bar. Will it go bang if I use P-connectors? /GKAM __________________ Stay #
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9th February 2008, 09:12	#2 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,189	Re: Maximum pressure handled by a P-port On my homebuilds I found that the joint between the p-port body and the counterlung material failed before the plug did. No idea at what pressure though. I'm sure it would be different if fitted into a solid material. __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
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10th February 2008, 16:29	#3 (permalink)
Tom Rose Still Learning Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Prism Topaz Other CCR Home Build Join Date: Oct 2005 Location: USA,North Carolina Posts: 329	Re: Maximum pressure handled by a P-port Quote: (Originally Posted by lizardland) On my homebuilds I found that the joint between the p-port body and the counterlung material failed before the plug did. No idea at what pressure though. I'm sure it would be different if fitted into a solid material. Last year I mounted a female "P" port in an ABS fitting to test my AERO 57 O2 sensors under 1 2/3 atmospheres of pressure. i.e. about 20 feet of water. The test was to determine if they were challenged. The "P" port system held up just fine. Tom __________________ The 50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong the first time. www.atlimp.com
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