Decompression Stop Padding

Lancer4545 · 16th April 2008, 09:28

This is a spin off from the VR3 BUH or VPM thread I started earlier.

I thought it'd be interesting to compare the different methods everyone is using when it comes to doing their deco.

Please add a SHORT explanation if you'd like.

Thanks,

Lance

**nigelh** · 16th April 2008, 11:46

"I dive with 2 computers running Bühlmann varients"
set to low conservatism
then I pad the stops.

clanger · 16th April 2008, 12:48

I often dive with open circuit divers so decompression is generaly dictated by them!

mattmexico · 16th April 2008, 13:11

yo

I dive mostly computer generated deco tables by V-Planner and controll with oc NiTek He and additional bottom timer. I feel very comfortable as well to use just two bottom timers and no deco computer at all.

The CCR dive computer is for a long timne on top of my items I would like to buy but have not gotten around it yet.

greetings
Matt

**sfldiver** · 16th April 2008, 13:33

I dive with my Optima's Hammerhead Handsets (Buh) set to 25/85 and my VR3 (VPM-B/E) set to "0" Conservatism. On low to moderate durations dives, these setting are somewhat equivalent, with the VR3 requiring longer deco obligation the longer the dive. I always attempt to clear both computers before leaving the water, as I am usually not in a big hurry; however, on longer dives, I have sometimes had to violate the VR3, because the deco obligation it displays appears to be unreasonable compared to the Hammerhead's deco obligation, as well at that of other divers in the water with me at the time.

pwl4476 · 16th April 2008, 14:53

Lancer, You've either too much time on your hands or you're figuring out just what makes the polls tick.

Different strokes for different dives.

1. I always dive with a VR3 BUH and a bottom timer. The VR3/Meg uses the 4th cell option.

2. If the dive is fairly shallow, but may be long, I use the VR3 and carry 1.2 constant PO2 tables as a backup. I would pad the table deco a bit by running a higher PO2 during the deco, but I haven't had a failure. I like to add a minute or 3 on O2 to the shallow stop so that I don't need to worry too much about exertion or a couple of beers.

3. On a deep dive I cut a primary and a backup table using V-Planner. The primary assumes the dive went according to plan. The Backup assumes that the dive was a bit deeper and/or a bit longer than planned. If the VR3 is working, I follow the computer, not the tables, but am comfortable with the tables. I like to add a few minutes to the shallower stops as I'm in no hurry to get out of the water.

4. I have missed or shortened a deep stop or two over time, but never violate on the shallower stops.

Paul

rossh · 16th April 2008, 15:41

Lance, Your poll needs another option I think.

I dive with a computer and carry backup tables.

Mark Chase · 16th April 2008, 16:01

These days i dive with a Shear water Pursuit GF computer

I set it to 10/90GF when ruining more than 40% Helium

Less than 40% Helium i run it on 30/85

I follow it exactly clear it at between 4 and 6m then spend 5mins ascending.

Unless I feel bad in which case ill modify the profile.

Back up is a Sunnto Vytec in gage mode and Ratio Deco with a few tweaks.

ATB

Mark

Mikel-Deko · 16th April 2008, 17:08

Hi my two cents.

Trimix dives: VPM tables and VR3. I follow the VPM in the deeper stops and then i clean the VR3 in the shallows. Slow ascent to surface.
As back up botton timer and tables.

Air dives: Just VR3.

Best

Mikel

aainslie · 16th April 2008, 17:11

Well, I answered "I dive with a computer" BUT I add a high level of conservativeness, i.e. +4 on the X1.

View Poll Results: How do you conduct you decompression
I dive with tables and no computer	11	13.10%
I dive with 1 computer and follow it implicitly	17	20.24%
I dive with a computer and add extra deco	23	27.38%
I dive with more than 1 computer running different algorithms	33	39.29%
Voters: 84. You may not vote on this poll

16th April 2008, 09:28	#1 (permalink)
Lancer4545 Closed Circuit Divers Aus Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2007 Location: Cairns QLD Australia Posts: 528	Decompression Stop Padding This is a spin off from the VR3 BUH or VPM thread I started earlier. I thought it'd be interesting to compare the different methods everyone is using when it comes to doing their deco. Please add a SHORT explanation if you'd like. Thanks, Lance __________________ You can run but you can't hide! ISC Appointed Megalodon Dealer for East Australia http://www.closedcircuitdivers.com.au info@closedcircuitdivers.com.au
(Online)

16th April 2008, 11:46	#2 (permalink)
nigelh New Member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 784	Re: Decompression Stop Padding "I dive with 2 computers running Bühlmann varients" set to low conservatism then I pad the stops. __________________ nigelh
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16th April 2008, 12:48	#3 (permalink)
clanger New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: May 2006 Location: England, Kent Posts: 30	Re: Decompression Stop Padding I often dive with open circuit divers so decompression is generaly dictated by them!
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16th April 2008, 13:11	#4 (permalink)
mattmexico Rebreather World Writer Current Rebreather/s: Megalodon Classic Kiss Optima RB80 / Clone Other Rebreather/s: Inspiration Classic Evolution Prism Topaz Sport Kiss RB80 / Clone Join Date: Aug 2005 Location: Mexico, Q.Roo, Playa del Carmen Posts: 696	Re: Decompression Stop Padding yo I dive mostly computer generated deco tables by V-Planner and controll with oc NiTek He and additional bottom timer. I feel very comfortable as well to use just two bottom timers and no deco computer at all. The CCR dive computer is for a long timne on top of my items I would like to buy but have not gotten around it yet. greetings Matt __________________ N 20' 37.617' W 87' 04.693' www.andreaswmatthes.com
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16th April 2008, 13:33	#5 (permalink)
sfldiver Team Optima Diver Current Rebreather/s: Optima Other Rebreather/s: Join Date: Jul 2007 Location: Pompano Beach, FL Posts: 627	Re: Decompression Stop Padding I dive with my Optima's Hammerhead Handsets (Buh) set to 25/85 and my VR3 (VPM-B/E) set to "0" Conservatism. On low to moderate durations dives, these setting are somewhat equivalent, with the VR3 requiring longer deco obligation the longer the dive. I always attempt to clear both computers before leaving the water, as I am usually not in a big hurry; however, on longer dives, I have sometimes had to violate the VR3, because the deco obligation it displays appears to be unreasonable compared to the Hammerhead's deco obligation, as well at that of other divers in the water with me at the time. __________________ *Currently piloting & shooting...* Dive Rite O2ptima FX Rigged w/ a Dsix Custom Aluminum Frame, Nomad Wing, Transpac Harness and VR3 Computer w/ VPM-B/E & a 4th Cell Sensor Link.* Canon PowerShot G9 Digital Camera *Rigged in a Patima-PDCH 2008 G9 Aluminum Housing w/ an Inon UWL-100 Achromat Wide Conversion Lens, 2 Inon UCL-165M67 Close-Up Lenses and 2 Inon Z-240 Strobes.
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16th April 2008, 14:53	#6 (permalink)
pwl4476 New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2007 Location: Olathe, KS Posts: 39	Re: Decompression Stop Padding Lancer, You've either too much time on your hands or you're figuring out just what makes the polls tick. Different strokes for different dives. 1. I always dive with a VR3 BUH and a bottom timer. The VR3/Meg uses the 4th cell option. 2. If the dive is fairly shallow, but may be long, I use the VR3 and carry 1.2 constant PO2 tables as a backup. I would pad the table deco a bit by running a higher PO2 during the deco, but I haven't had a failure. I like to add a minute or 3 on O2 to the shallow stop so that I don't need to worry too much about exertion or a couple of beers. 3. On a deep dive I cut a primary and a backup table using V-Planner. The primary assumes the dive went according to plan. The Backup assumes that the dive was a bit deeper and/or a bit longer than planned. If the VR3 is working, I follow the computer, not the tables, but am comfortable with the tables. I like to add a few minutes to the shallower stops as I'm in no hurry to get out of the water. 4. I have missed or shortened a deep stop or two over time, but never violate on the shallower stops. Paul
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16th April 2008, 15:41	#7 (permalink)
rossh New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jul 2005 Location: Canada Posts: 90	Re: Decompression Stop Padding Lance, Your poll needs another option I think. I dive with a computer and carry backup tables.
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16th April 2008, 16:01	#8 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Jan 2005 Location: Kent Posts: 2,409	Re: Decompression Stop Padding These days i dive with a Shear water Pursuit GF computer I set it to 10/90GF when ruining more than 40% Helium Less than 40% Helium i run it on 30/85 I follow it exactly clear it at between 4 and 6m then spend 5mins ascending. Unless I feel bad in which case ill modify the profile. Back up is a Sunnto Vytec in gage mode and Ratio Deco with a few tweaks. ATB Mark __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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16th April 2008, 17:08	#9 (permalink)
Mikel-Deko Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: Basque Country -Sp- Posts: 406	Re: Decompression Stop Padding Hi my two cents. Trimix dives: VPM tables and VR3. I follow the VPM in the deeper stops and then i clean the VR3 in the shallows. Slow ascent to surface. As back up botton timer and tables. Air dives: Just VR3. Best Mikel __________________ Mikel-Deko Basque Country www.olatu.net "DIR is the nanny state for divers who cannot think on their own" Ron Micjan
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16th April 2008, 17:11	#10 (permalink)
aainslie New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Apr 2006 Location: LA Posts: 63	Re: Decompression Stop Padding Well, I answered "I dive with a computer" BUT I add a high level of conservativeness, i.e. +4 on the X1. __________________ Andrew Ainslie
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