hx is shorthand for heat exchanger
BIBS air is pulled (usually) off the sub's main air supply
Mine's outside, although George didn't build it that way
The one atmosphere thing stems from the JSL accident, which was eventually a decompression issue on top of everything else. You don't decompress from one bar. Then your relief valve vents overpressure as the sub ascends through the equivelant to inside pressure
vance
-----Original Message-----
From: ShellyDalg@aol.com
To: personal_submersibles@psubs.org
Sent: Wed, Mar 24, 2010 9:39 pm
Subject: Re: [PSUBS-MAILIST] Flooded Stability.
Pressure vessels and hx are not to be located within the pressure boundary
Does this include scuba tanks ? What about the emergency air for smoke and or flooding and exiting the sub? Frank D. ( What's hx ? )