[PSUBS-MAILIST] Acceptable cabin pressure swing

[hank pronk via Personal_Submersibles]

Alan,The DW needs air to replace the water pumped out of the VBT inside the sub,?No need for an air conditioner, a simple shot of air compensates.  I am glad to have that problem instead of dealing with warm water and being hot inside the sub.Hank 

    On Wednesday, February 24, 2016 3:31 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 When I dive Gamma, I find I have a slight negative pressure for most of the dive as the air shrinks from the cold.  The temperature swing is huge from surface to 100 feet.   As a rule when I dive for any length of time I balance the sub out to Zero on the altimeter by either turning on the compressor or giving a shot of air before I start to surface.  It is pretty easy to keep the sub within 100 feet from set point on the altimeter, and that is my comfort level.Hank 

    On Wednesday, February 24, 2016 2:58 PM, Lasse Schmidt Westrén via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Is it possible to correlate the alarm to temperature change in cabin from start of dive? Pressure change might well be over 4 psi if it is hot outside and the water is cold.

Cheers Lasse

2016-02-24 20:12 GMT+01:00 Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>:


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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