DIRebreather Standards melting pot

[Mark Chase]

Here we go then. Please add to list your ideas or pass comment on existing ideas and we will see how it goes.



OK Fill in the blanks or say yes/no/why?


BOVs as standard?

HUDS as standard?

Max END for diluent 25m?

Max PP02 for Dill at planned depth 1.2 (thats dill gas, not loop gas)

Max PP02 for bailout 1.6 on OW diving 1.4 on return to shot or penetration diving.


AVG SAC for planned deep bailout 2.5X your sac

Avg SAC for intermediate bailout 1.5 X your sac

ADV,s if used to have shut off valves

BOVs to have shut off valves dived closed

BOVs to be plumbed in to off board gas below 25m max planned depth

Minimum of two independent buoyancy systems capable of 25kg lift or more.

Suit inflation to be via independent gas supply

Bailout tanks to have OC regulator option and hoses for connection to diluent, suit wing inflation, and 02 valves


Standard bailout gases

50% to max 21m OW 18m Overhead or return to Shot
36% to 35m OW 30m Overhead or return to Shot
21/35 to 66m OW to 57m Overhead or return to Shot
18/45 to 80m OW to 69m Overhead or return to Shot
14/65 to 100m OW to 90m Overhead or return to Shot
10/70 to 130m due to extreme depth max 1.4


Diluients:

No standard except max PP02 at max depth not to exceed 1.2 and max END not to exceed 25 at max planed dive depth.

PP02: Divers to agree and match PP02s for dive within the teem based on planned diving conditions

Not to exceed 1.3 for the working phase of the dive

Not to exceed 1.4 for decompression below 6.0m

Not to exceed 1.6 at 6m

Diving standard checks: OK things will no doubt get MORE contentious here

Minimum 10min pre breath before dive.

Flow check to be carried out on loop during pre breath

Gas check on 02 by manual injection

Gas check on dilluient by ASV test manual injection and BOV check.

Teem check on dive buddies PP02 immediately before entering the water. Check to be "on loop" visual and confirmed by taping the buddies hand set and giving a clear OK signal.

Immediately after entering the water the divers to check hand sets and confirm with buddies with clear OK and descend signal thumbs down.

At 6m divers to carry out bubble check and confirm with clear OK signal or finger taping scissors bubble signal.

Divers to descend to 10.0m and spike 02 to 1.6 pp02 by manual injection. On completion divers to flush enriched gas and flush with ADV or manually to return to set point.

Upon reaching max depth divers to check hand sets prior to tasking connection of strobes lines etc.


Prior to proceeding with dive all divers to switch to low set point dill flush and check cells. If successful to switch back to high set point and confirm by showing hand set to other teem member who will confirm with OK before dove commencing.

During the dive if cell readings are unusual then divers to signal other members of the teem and achieve a face to face station then to carry out a manual spike of the 02 to 1.6pp02 followed by a switch to low set point for a diluent flush to confirm cell range. If acceptable on switching back to high set point buddy to check hand sets and confirm by taping hand set and giving clear OK signal prior to aborting or continuing dive.

If unacceptable cell errors have occurred diver to immediately bailout via BOV prior to a decision to end the dive OC or to end the dive by flushing the unit with diluent and returning in a semi closed state.

Teem to agree on action and buddy has ultimate authority on decision to abort dive.

If

Diver in difficulty to lead the way on exit and to ascend above teem on shot line ascents.



OK I am running out of steem ideas please....



ATB

Mark Chase

[Woz]

Spares available from B&Q plumbing department

[Phoenix]

Right, so despite the yes/no to BOV's at the beginning they reappear in the procedures towards the end. The thinking behind the post obviously relates to specific units (you certainly don't need to see my handset to check my PO2, nor do I need a BOV to access OC gas)

Not wanting to pull this apart Mark but as I see it there are "fundamental" difficulties in standardising very different units. You can wheel out the "it's not about the kit" argument but it doesn't relate well to the CCR world. If we look at the areas that we could standardise on wouldn't we just be diving the way we were taught to on MOD3?

Ian

[gibbon]

Reinventing the wheel - Wikipedia, the free encyclopedia

No offence intended but here we go again, what is your end goal, how are you intending to get there and how will you know when you have got there?

[SoggyFox]

Originally Posted by jonny

No offence intended but here we go again, what is your end goal, how are you intending to get there and how will you know when you have got there?

you never know where your going to get to unless you actually take the first step.

so put your knowledge and experience forward and enlighten those, such as myself, that don't know but are interested to hear what you have to say.

[Mark Chase]

Originally Posted by Phoenix

Right, so despite the yes/no to BOV's at the beginning they reappear in the procedures towards the end. The thinking behind the post obviously relates to specific units (you certainly don't need to see my handset to check my PO2, nor do I need a BOV to access OC gas)

Not wanting to pull this apart Mark but as I see it there are "fundamental" difficulties in standardising very different units. You can wheel out the "it's not about the kit" argument but it doesn't relate well to the CCR world. If we look at the areas that we could standardise on wouldn't we just be diving the way we were taught to on MOD3?

Ian

I disagree totaly

1: you can put a BOV on any unit a FFM with intigrated bov is a bov

2: I need to see your PP02. I dont care how or where you put your PP02 merer, I just need to see it and you need to know i have seen it. So using your wrist mounted one instead of the one on your arse makes this easier as we have face to face comunication. I could check the one on your arse then give your arse a squeze to confirm but i dont think this would be a popular standard.

3: the idears are there to be pulled appart. So go for it with your better ideas.


ATB

Mark Chase

[Mark Chase]

Originally Posted by jonny

Reinventing the wheel - Wikipedia, the free encyclopedia

No offence intended but here we go again, what is your end goal, how are you intending to get there and how will you know when you have got there?

1: I wont be diving with a buddy thinking what the f#ck is he doing

2: We wont be on the boat afterwards going OhhhhhhhI thuaght you ment do such and such

3: Fewer CCR divers will die.

If your not interested in the core principle of a DIRebreather system please dont comment on this thread do it on the other one. This thread is for discusing the system that people who are interested would find comfortable to adopt

ATB

Mark Chase

[gobfish1]

New you would have to post this a some point


looks good, Just need to know
AVG SAC for planned deep bailout 2.5X your sac ( what’s deep )

Avg SAC for intermediate bailout 1.5 X your sac ( what’s intermediate )

[Mark Chase]

Originally Posted by gobfish1

New you would have to post this a some point

Didnt want too. Dont think i am good enough.

looks good, Just need to know
AVG SAC for planned deep bailout 2.5X your sac ( what’s deep )

Avg SAC for intermediate bailout 1.5 X your sac ( what’s intermediate )

Deep is max depth first responce bailout.

So i am asuming a masive SAC folowing C02 hit on initial bailout. Then by the time you switch to the second bottle you should have breathing under control. Intemediate bailout could be 21/35 at 66m if you bailed to 10/70 at 100

If one bailout bottle only then 2.5 X sac.

ATB

Mark Chase

[scribley]

A BOV on a Meg is a bit of overkill IMHO. The high flow ADV will totally flush the loop in about the same time as it takes to open a BOV (ok, maybe fractionally longer).
adding a BOV just adds extra things to go wrong..