Working at 350'

[lamont]

The dive team you actually hire will come up with a better plan than this, but this is the general idea of what an OC dive looks like:



V-Planner 3.61 by R. Hemingway, VPM code by Erik C. Baker.

Decompression model: VPM - B

DIVE PLAN
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 2

Dec to 200ft (3) Trimix 10/70 60ft/min descent.
^^^ Low pp ^^^ Low pp ^^^
Dec to 350ft (5) Trimix 10/70 60ft/min descent.
Level 350ft 24:10 (30) Trimix 10/70 1.16 ppO2, 64ft ead, 82ft end
Asc to 280ft (32) Trimix 10/70 -30ft/min ascent.
Stop at 280ft 0:40 (33) Trimix 10/70 0.95 ppO2, 46ft ead, 61ft end
Stop at 270ft 1:00 (34) Trimix 10/70 0.92 ppO2, 44ft ead, 58ft end
Stop at 260ft 1:00 (35) Trimix 10/70 0.89 ppO2, 41ft ead, 55ft end
Stop at 250ft 1:00 (36) Trimix 10/70 0.86 ppO2, 39ft ead, 52ft end
Stop at 240ft 1:00 (37) Trimix 10/70 0.83 ppO2, 36ft ead, 49ft end
Stop at 230ft 1:00 (38) Trimix 10/70 0.80 ppO2, 34ft ead, 46ft end
Stop at 220ft 2:00 (40) Trimix 10/70 0.77 ppO2, 31ft ead, 43ft end
Stop at 210ft 1:00 (41) Triox 21/35 1.54 ppO2, 102ft ead, 125ft end
^^^ IBCD ppN2 alert ^^^ IBCD ppN2 alert ^^^
Stop at 200ft 1:00 (42) Triox 21/35 1.48 ppO2, 97ft ead, 118ft end
Stop at 190ft 2:00 (44) Triox 21/35 1.42 ppO2, 91ft ead, 112ft end
Stop at 180ft 1:00 (45) Triox 21/35 1.35 ppO2, 86ft ead, 105ft end
Stop at 170ft 2:00 (47) Triox 21/35 1.29 ppO2, 80ft ead, 99ft end
Stop at 160ft 2:00 (49) Triox 21/35 1.23 ppO2, 74ft ead, 92ft end
Stop at 150ft 2:00 (51) Triox 21/35 1.16 ppO2, 69ft ead, 86ft end
Stop at 140ft 2:00 (53) Triox 21/35 1.10 ppO2, 63ft ead, 79ft end
Stop at 130ft 4:00 (57) Triox 21/35 1.04 ppO2, 58ft ead, 73ft end
Stop at 120ft 3:00 (60) Triox 21/35 0.97 ppO2, 52ft ead, 66ft end
Stop at 110ft 4:00 (64) Triox 21/35 0.91 ppO2, 47ft ead, 60ft end
Stop at 100ft 6:00 (70) Triox 21/35 0.85 ppO2, 41ft ead, 53ft end
Stop at 90ft 6:00 (76) Triox 21/35 0.78 ppO2, 35ft ead, 47ft end
Stop at 80ft 8:00 (84) Triox 21/35 0.72 ppO2, 30ft ead, 40ft end
Stop at 70ft 6:00 (90) Nitrox 50 1.56 ppO2, 32ft ead
Stop at 60ft 7:00 (97) Nitrox 50 1.41 ppO2, 26ft ead
Stop at 50ft 11:00 (108) Nitrox 50 1.26 ppO2, 20ft ead
Stop at 40ft 13:00 (121) Nitrox 50 1.10 ppO2, 13ft ead
Stop at 30ft 21:00 (142) Nitrox 50 0.95 ppO2, 7ft ead
Stop at 20ft 25:00 (167) Oxygen 1.60 ppO2, 0ft ead
^^^ CNS high ^^^ CNS high ^^^
Stop at 10ft 42:00 (209) Oxygen 1.30 ppO2, 0ft ead
^^^ CNS high ^^^ CNS high ^^^
Surface (209) Oxygen -30ft/min ascent.
^^^ CNS high ^^^ CNS high ^^^

Off gassing starts at 305.6ft

OTU's this dive: 266
CNS Total: 136.8%
^^^ CNS high ^^^ CNS high ^^^

297.2 cu ft Trimix 10/70
122.3 cu ft Triox 21/35
80.7 cu ft Nitrox 50
56.8 cu ft Oxygen
557.1 cu ft TOTAL


DIVE PLAN COMPLETE

********* WARNING & DISCLAIMER *********
This V-Planner generated dive schedule could indirectly kill you.
The author does not warrant that it accurately reflects the Varying
Permeability Model algorithms, that it won't get you bent or dead, or that it
will produce safe, reliable results. This dive schedule is experimental
and you use it at your own risk. Diving in general is fraught with
risk, and decompression diving adds significantly more risk.
Deep diving utilizing multiple gasses, including Helium, is about
as risky as it gets.

This schedule is not intended for uneducated users. V-Planner and the
decompression schedules it produces are tools for experienced mixed-gas
decompression divers ONLY. If you have not been properly trained in
mixed-gas decompression diving by an internationally recognized technical
certification agency and/or don't have a firm handle on decompression
planning and mixed-gas diving, then DO NOT USE THIS DIVE SCHEDULE.

 

[JeffG]

The dive team you actually hire will come up with a better plan than this, but this is the general idea of what an OC dive looks like:

To much gas and gear. He should just buy a rebreather and go that route.

 

[lamont]

To much gas and gear. He should just buy a rebreather and go that route.

yeah, that's rebreather territory. the profile looks pretty similar, though, unless you really hammer on the O2 and you'll need just as much OC bailout gas...

 

[JeffG]

and you'll need just as much OC bailout gas...

Tell that to the Tom Mount trips to the Caymans. Everyone carries a 40 and they "pool" them if there is a problem. LOL (and no, in case you ask...I'm not kidding.)

 

[lamont]

Tell that to the Tom Mount trips to the Caymans. Everyone carries a 40 and they "pool" them if there is a problem. LOL (and no, in case you ask...I'm not kidding.)

Heh, okay.

This the same training agency that teaches you when you need to leave your buddy behind and fend for yourself (even though he's got half your bailout)?

 

[JeffG]

Heh, okay.

This the same training agency that teaches you when you need to leave your buddy behind and fend for yourself (even though he's got half your bailout)?

Yep...Its all fun and games until.....you're dead.

 

[Diesel298]

well first off. im hoping you hiring a professional commercial diving outfit for said job..
what kind of work is this, salvage, survey...
this job would be done using surface supply and mixed gas.
also surface deco would also be used...(shallow stops done in the chamber)
get a copy of v planner of the web and play with the numbers, but please dont consider having that program to be all the info you need for said job

 

[Doc Intrepid]

I have a job coming up requiring some dive work at 350’. This is way deeper then my experience level would permit. How much bottom time is realistic for the dive team? How long would the Deco be? What support would be needed on the surface ship? How much surface interval between dives?

Pick up the phone and call a commercial company. It will be an impressive invoice. The bottom time required to do the job will depend entirely on the job. It is likely to be a surface-suppled job. (Look at Lamont's V-Planner printout, check total gas required: an OC diver could not carry sufficient gas.) If its a planned working dive it would use commercial protocols. Whatever the total deco time would be, it would likely be too long to be done safely in the water. It will be done in a chamber, onboard the suface support ship. Due to many factors, unless its a huge job the divers would likely remain until the task is completed rather than make multiple dives (which requires the ship to remain on station longer, which - given weather issues - can be problematic, particularly if you plan to have divers in the water over multiple days). Then start looking at contingency planning in the event that something craps the bed during the dive.

Your best bet is to contact a commercial company and discuss it with them to get a more in-depth idea of the requirements. No pun intended.....

 

[Sideband]

From the profile: "deepest dive 130' "
....are you out of your mind?

Your post had better be a complete joke...

Since he said

This is way deeper then my experience level would permit.

It doesn't sound like he has any intentions of making this dive. Reading comprehension can be a wonderful thing. :shakehead

Joe

 

[lamont]

so what is the price tag on this kind of thing? can it be done in the 6 digits, or is this strictly a 7 digit plus kind of operation?