[PSUBS-MAILIST] Life Support Alarms

[Sean T. Stevenson via Personal_Submersibles]

There is a humidity guideline in the ABS rules, which is 30% - 70% RH (non-condensing). While cabin temperature is not specifically addressed in the underwater systems rules, it is addressed elsewhere in ABS publications. I don't remember offhand whether it is from the ergonomics guide, the bridge design guide, or the steel vessel rules, but I do recall that HVAC is to maintain temperature within the range of 14°C to 30°C (57.2°F to 86°F). PSubs may need some leeway on the low end, substituting appropriate clothing (and emergency / survival insulation) for active heaters. Diving bells carry emergency insulating survival cocoons for the occupants for an emergency which entails loss of hot water supply to the bell, as the temperature will rapidly drop to the ambient water temperature. PSubs are no different unless they are insulated by design.

Sean

-------- Original Message --------
On Dec. 13, 2020, 10:42, Jon Wallace via Personal_Submersibles 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 percent
> CO2: 0 to 5000 ppm
> Pressure: +/- 1psi
>
> Comments?
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