[PSUBS-MAILIST] DEEP WORKER

[Phil Nuytten <72020.572@compuserve.com>]

Hi, Pat:
        We carry 100 cubic feet of O2 ( 2 standard SCUBA '50's) and two Co2
scrubbers with a rated duration of  36 hours each ( 72 hour total) and an
actual of about 43-45 hours each ( 86-90 hours total). Deepworker has an
life support system that is briefly described  in a DW2000 technical paper
on  Nuytco's website -( www.nuytco.com ) The reason for two O2 tanks and
two scrubbers is that we also have two bellows-add controllers, two
continous-flow metered orifices, two sets of analog supply pressure and
intermediate pressure guages, and two sets of emergency by-pass valves . .
.in other words, two complete, independant, redundant, life support
systems.  If the port side fails, we still have 36 hours on the starboard
side, plus the ability to do a passive breathe (via  oral/nasal mask)
through the second scrubber to restore full 72 hours - hence the reason for
the large 02 supply on both sides, going in. You could wipe out one side
completely and still have one functioning side plus a fully accessible 
second scrubber. At a conservative minimum exertion consumption rate of .25
to .35 lpm 02, a single 50 of 02 would last around a 100 hours - or  about
the actual scrubber time.  
Phil Nuytten