Aren’t we missing the point here about the major difference between CCR and OC…
CCR requires a lot more attention to detail in the care and preparation of the rebreather. They’re very complex machines with many failure modes. If you approach CCR with a slapdash just throw it all together attitude— that is quite possible on OC — then you’d better be ready to accept failures and far greater risk.
Only if you have o rings or cables of death… My JJ is sat in the house and if the rain got really bad the longest part of me getting in the water would be going to the garage and back to fetch the dil and o2.
The worst bit for me is the clean up after dives.
From scratch build, as it is sat dry at this moment:
get it out of the cupboard
take the head out
remove scrubber from the head, check dates on cells in case of forgetfulness, falling through a black hole etc
unscrew the scrim holder from the bottom of the scrubber
Go outside to fill scrubber (happen to have sorb in the house but don’t want sorb on the floor) tapping etc 10 minutes
put the scrim holder back on the scrubber
inspect the head to canister o rings, clean as required (but this will be ok as I put it away clean)
screw scrubber to head
inspect the inside of the can where the head o rings go, clean as required
maybe lube the head/can o-rings
put the head/scrubber combo back into the canister
attach o2 feed to head
attach head loop hoses to the lung tee pieces
fit dil and o2 cylinders 5 minutes (maybe 20 minutes if I don’t know what gas is in them)
program gases
if using a drysuit inflate system fit it now 5 minutes (plus panic time thinking “oh no did I leave It somewhere?”)
check BOV loop mushroom valves work
attach BOV loop to lung tee pieces
if I have OC gas to hand I will check the BOV OC works at this point
calibrate cells 5 minutes
gentle negative test, long positive test
drink coffee, find drysuit socks while positive test is happening
do a prebreath to be sure everything is vaguely working.
check manual adds, ADV, wing inflate
maybe remove bov/loop put it in the car, drive to boat.
at the boat, put the loop back on, neg and positive tests, gas on, pressures, ADV, manual adds, BOV, prebreath,
between dives:
optionally undo the exhaust loop to let the gloop drain out and help head/cells dry out a bit, then, after lunch or whatever, put it back negative and positive tests
turn the gas on, check pressures, gas on, pressures, ADV, manual adds, BOV, prebreath, dive
need different gas or a top up?
undo the exhaust loop to let the gloop drain out etc as above,
remove cylinders, fill, measure, refit, program gas,
turn the gas on, check pressures, gas on, pressures, ADV, manual adds, BOV, prebreath, dive
need a scrubber fill?
as per the dry setup, maybe leave the head/cells to dry off while eating dinner before screwing the scrubber on
