O2tima Checklists

**nthaggard** · 2nd April 2008, 21:38

Thanks! Mark

JCdesign97 · 3rd April 2008, 02:53

I didn't do my training with Mark D., but when I first dove with the SCRUBs in Florida and saw the laminated last-minute checklists I liked the idea. Adrian was kind enough to give me an extra that he had. My only problem was that diving up here, the little card usually finds its way to the bottom of my box and isn't in my hand while I'm doing the last bit of kitting up. I wanted something to remind me of the last critical items to double and triple check that would be right in front of my face and hard to ignore, so I printed these labels up on waterproof vinyl adhesive and covered them with clear tape. They will likely only last one season before getting chewed up and illegible, but then I can just make a new set. I wear both the primary and secondary strapped on both wrists, so I can't possibly avoid seeing these as I get my last bits secured.

Tony_Q · 3rd April 2008, 03:51

Hi Mark,

Thanks for making your lists public.

I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked?

This check also appears to be missing from the Diverite "Survival" pre-dive checklist.

Regards,
Tony

diverreb · 3rd April 2008, 04:34

Quote: (Originally Posted by JCdesign97)

I didn't do my training with Mark D., but when I first dove with the SCRUBs in Florida and saw the laminated last-minute checklists I liked the idea. Adrian was kind enough to give me an extra that he had. My only problem was that diving up here, the little card usually finds its way to the bottom of my box and isn't in my hand while I'm doing the last bit of kitting up. I wanted something to remind me of the last critical items to double and triple check that would be right in front of my face and hard to ignore, so I printed these labels up on waterproof vinyl adhesive and covered them with clear tape. They will likely only last one season before getting chewed up and illegible, but then I can just make a new set. I wear both the primary and secondary strapped on both wrists, so I can't possibly avoid seeing these as I get my last bits secured.

Great idea John. Only I'd have to make them a bit smaller as the new light weight, dual deco, battery reading, ss hand opening battery door, Delrin Handsets are a bit smaller than the old style antique handsets!

Richie

***jradomski*** · 3rd April 2008, 04:36

Quote: (Originally Posted by Tony_Q)

Hi Mark,

Thanks for making your lists public.

I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked?

This check also appears to be missing from the Diverite "Survival" pre-dive checklist.

Regards,
Tony

Nope,
proper checking of the one way valves requires removing the hoses.. The survival check list assumes the rig is already assembled, and a quick verification is done.. The one way vales are spposed to be thoroughly tested on the initial assembly for the day...

Tony_Q · 3rd April 2008, 06:30

Hi Joe,

Mushroom valves and loop integrity are both checked post assembly but only loop integrity needs rechecking?

I guess it turns on the effort/risk of re-opening the loop (fairly easy to do on an O2ptima) with the risk that operation of the mushroom valves has been compromised between unit assembly and doing the dive.

No right or wrong answer, but it appears that the training agencies/instructors are settling on different approaches.

Regards,
Tony

***jradomski*** · 3rd April 2008, 06:50

Quote: (Originally Posted by Tony_Q)

Hi Joe,

Mushroom valves and loop integrity are both checked post assembly but only loop integrity needs rechecking?

I guess it turns on the effort/risk of re-opening the loop (fairly easy to do on an O2ptima) with the risk that operation of the mushroom valves has been compromised between unit assembly and doing the dive.

No right or wrong answer, but it appears that the training agencies/instructors are settling on different approaches.

Regards,
Tony

once you "break" the loop you should do a complete integritry test.. The survival checklist is mainly that.. The rig is assembled already and a quick verification that everything is still ok..

one way valves do not fail often, and when they do its usually a cleaning issue..

The main reasons for one way valve failure is debris in the valve - usually sorb dust or granules.. this is not generally not a concern for optima divers..

warped valves.. this can occur when using hot water to clean the hoses.. these problems are highly unlikely to occur after the unit has been tested and assembled..

a leakey mushroom valve could also be a damaged spyder.. once its in the DSV its not likely to break... this type of failure would be caught on the full predive check..

You can do a quickie test thats not perfect by alternating and squeezing the hoses and breathing/blowing..

n2diving · 3rd April 2008, 12:43

Quote: (Originally Posted by Tony_Q)

I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked?

I have assembly and post assembly checklists as well, but these are not yet published. The mushroom checks are in the assembly checklist, while the loop is open. It's possible to do something of a post assembly check on the mushrooms when the loop is assembled by squeezing hoses, but it's fairly redundant. There are plenty more items that could be checked too... however they are not intended to be comprehensive. Add whatever checks you feel are important.

-- Mark

JCdesign97 · 3rd April 2008, 13:12

Quote: (Originally Posted by diverreb)

Great idea John. Only I'd have to make them a bit smaller as the new light weight, dual deco, battery reading, ss hand opening battery door, Delrin Handsets are a bit smaller than the old style antique handsets!

Richie

I figured someone would be breaking my balls about the old handsets, Richie.

You're right of course and the new delrin handsets are sweet; but the old metal bricks are still better at one thing - bludgeoning one of your buddies to death in the Keys in two weeks ...

jiseson · 3rd April 2008, 13:17

Quote: (Originally Posted by JCdesign97)

I figured someone would be breaking my balls about the old handsets, Richie.

You're right of course and the new delrin handsets are sweet; but the old metal bricks are still better at one thing - bludgeoning one of your buddies to death in the Keys in two weeks ...

old handsets also act as part of your weights! u can hit a shark in the head with them...

2nd April 2008, 21:38	#11 (permalink)
nthaggard Supporting Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: Sep 2007 Location: Jacksonville, FL Posts: 28	Re: O2tima Checklists Thanks! Mark __________________ ______________________________________________ Neill "If you're gonna be stupid...you better be tough"
(Offline)

3rd April 2008, 03:51	#13 (permalink)
Tony_Q New Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: May 2005 Location: Australia Posts: 58	Re: O2tima Checklists Hi Mark, Thanks for making your lists public. I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked? This check also appears to be missing from the Diverite "Survival" pre-dive checklist. Regards, Tony
(Offline)

3rd April 2008, 04:34	#14 (permalink)
diverreb DE/MD/NJ Wreck Diver Current Rebreather/s: Optima Other Rebreather/s: Join Date: Mar 2007 Location: Dover, DE Posts: 596	Re: O2tima Checklists Quote: (Originally Posted by JCdesign97) I didn't do my training with Mark D., but when I first dove with the SCRUBs in Florida and saw the laminated last-minute checklists I liked the idea. Adrian was kind enough to give me an extra that he had. My only problem was that diving up here, the little card usually finds its way to the bottom of my box and isn't in my hand while I'm doing the last bit of kitting up. I wanted something to remind me of the last critical items to double and triple check that would be right in front of my face and hard to ignore, so I printed these labels up on waterproof vinyl adhesive and covered them with clear tape. They will likely only last one season before getting chewed up and illegible, but then I can just make a new set. I wear both the primary and secondary strapped on both wrists, so I can't possibly avoid seeing these as I get my last bits secured. Great idea John. Only I'd have to make them a bit smaller as the new light weight, dual deco, battery reading, ss hand opening battery door, Delrin Handsets are a bit smaller than the old style antique handsets! Richie
(Online)

3rd April 2008, 04:36	#15 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,998	Re: O2tima Checklists Quote: (Originally Posted by Tony_Q) Hi Mark, Thanks for making your lists public. I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked? This check also appears to be missing from the Diverite "Survival" pre-dive checklist. Regards, Tony Nope, proper checking of the one way valves requires removing the hoses.. The survival check list assumes the rig is already assembled, and a quick verification is done.. The one way vales are spposed to be thoroughly tested on the initial assembly for the day... __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
(Offline)

3rd April 2008, 06:30	#16 (permalink)
Tony_Q New Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: May 2005 Location: Australia Posts: 58	Re: O2tima Checklists Hi Joe, Mushroom valves and loop integrity are both checked post assembly but only loop integrity needs rechecking? I guess it turns on the effort/risk of re-opening the loop (fairly easy to do on an O2ptima) with the risk that operation of the mushroom valves has been compromised between unit assembly and doing the dive. No right or wrong answer, but it appears that the training agencies/instructors are settling on different approaches. Regards, Tony
(Offline)

3rd April 2008, 06:50	#17 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,998	Re: O2tima Checklists Quote: (Originally Posted by Tony_Q) Hi Joe, Mushroom valves and loop integrity are both checked post assembly but only loop integrity needs rechecking? I guess it turns on the effort/risk of re-opening the loop (fairly easy to do on an O2ptima) with the risk that operation of the mushroom valves has been compromised between unit assembly and doing the dive. No right or wrong answer, but it appears that the training agencies/instructors are settling on different approaches. Regards, Tony once you "break" the loop you should do a complete integritry test.. The survival checklist is mainly that.. The rig is assembled already and a quick verification that everything is still ok.. one way valves do not fail often, and when they do its usually a cleaning issue.. The main reasons for one way valve failure is debris in the valve - usually sorb dust or granules.. this is not generally not a concern for optima divers.. warped valves.. this can occur when using hot water to clean the hoses.. these problems are highly unlikely to occur after the unit has been tested and assembled.. a leakey mushroom valve could also be a damaged spyder.. once its in the DSV its not likely to break... this type of failure would be caught on the full predive check.. You can do a quickie test thats not perfect by alternating and squeezing the hoses and breathing/blowing.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
(Offline)

3rd April 2008, 12:43	#18 (permalink)
n2diving Custom Title Allowed! Current Rebreather/s: Optima Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Feb 2005 Location: Florida, USA Posts: 271	Re: O2tima Checklists Quote: (Originally Posted by Tony_Q) I am curious that your pre-dive checklist does not include a check on the correct operation of the DSV one-way valves. If checking of loop integrity by way of negative and positive pressure tests is warranted, shouldn't verification of correct gas flow direction also be checked? I have assembly and post assembly checklists as well, but these are not yet published. The mushroom checks are in the assembly checklist, while the loop is open. It's possible to do something of a post assembly check on the mushrooms when the loop is assembled by squeezing hoses, but it's fairly redundant. There are plenty more items that could be checked too... however they are not intended to be comprehensive. Add whatever checks you feel are important. -- Mark
(Offline)

3rd April 2008, 13:12	#19 (permalink)
JCdesign97 My unit can beat up yours Current Rebreather/s: Optima Other Rebreather/s: Join Date: Mar 2007 Location: PA, USA Posts: 383	Re: O2tima Checklists Quote: (Originally Posted by diverreb) Great idea John. Only I'd have to make them a bit smaller as the new light weight, dual deco, battery reading, ss hand opening battery door, Delrin Handsets are a bit smaller than the old style antique handsets! Richie I figured someone would be breaking my balls about the old handsets, Richie. You're right of course and the new delrin handsets are sweet; but the old metal bricks are still better at one thing - bludgeoning one of your buddies to death in the Keys in two weeks ... __________________ Cheers, John Cogan
(Online)

3rd April 2008, 13:17	#20 (permalink)
jiseson DSIX/O2PTIMA Current Rebreather/s: Optima Other Rebreather/s: Join Date: Jun 2006 Location: long island,ny Posts: 562	Re: O2tima Checklists Quote: (Originally Posted by JCdesign97) I figured someone would be breaking my balls about the old handsets, Richie. You're right of course and the new delrin handsets are sweet; but the old metal bricks are still better at one thing - bludgeoning one of your buddies to death in the Keys in two weeks ... old handsets also act as part of your weights! u can hit a shark in the head with them... __________________ *Jonathan D Iseson*
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode