[PSUBS-MAILIST] Life Support Alarms

[Jon Wallace via Personal_Submersibles]

 Cliff,
Looking at your flathead lake data, you had a total spread of about .5psi during your dives.  High of 14.1 and low of 13.6 from what I can see of the data you provided.  So a 1-2 psi variant either side of atmospheric seems like it would be reasonable.
Jon

    On Sunday, December 13, 2020, 02:12:35 PM EST, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  For a Psub Life Support standard, I think you should stick with ABS rules as much as possible.  For sure being able to measure, control and set alarm states for CO2 and O2 at the level you notes are critical. Other parameters like cabin temperature and relative humidity (RH) I think are important to measure for safety reason but not control.  If you measure RH and cabin temperature them you can calculate the the Heat Index in the boat from Heat Index Formula Celsius - Definition, Formula And Solved Examples (byjus.com) which is nice to know given we dive in hot climates and normally don't have AC in the boats.  I personally think +/1 1 psi is a bit tight and +/- 2 psi is adequate.  As Sean notes, ABS rules call out for the control of humidly and temperature.  I think this is a bit to constraining for PSub world and I don't know of any PSubs.org boats that have AC control.
Cliff

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Heat Index Formula Celsius - Definition, Formula And Solved Examples

The Heat Index (HI) is an equation combining air temperature and relative humidity to determine the equivalent t...
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    On Sunday, December 13, 2020, 11:43:40 AM CST, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 I'm looking to start a discussion to create a PSUBS standard for max/min cabin operating conditions.  I'm not convinced temp or humidity matter all that much overall and require an agreement.  I would start with the following:
O2:    19.0 to 23 percentCO2:  0 to 5000 ppmPressure:  +/- 1psi
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