Exceeding the NDL during recreation diving

[lairdb]

My post figure was straight off MultiDeco. I used my average RMV of 0.36 cu ft/min from 1,917 dives over the last 14 years under all kinds of conditions. The variation around this average is not very great, with a std dev of 0.04 cu ft/min. My avg RMV over the last several years is a bit lower than the overall average.

I was using @crofrog example of a planned rec deco dive of 15 min at 130 ft using air, GFs of 40/85, that ended up going over by 5 min. I would do this dive on 28% and do not use 40/85.

Oh, not disputing -- just jealous of your SAC. I average 0.44 and use 0.5 for rough planning, and the 20min@130fsw on air came out needing more than the AL80 even without contingencies, so I was curious. Agreed across the board on the rest.

 

[scubadada]

Oh, not disputing -- just jealous of your SAC. I average 0.44 and use 0.5 for rough planning, and the 20min@130fsw on air came out needing more than the AL80 even without contingencies, so I was curious. Agreed across the board on the rest.

Your gas consumption is considerably below the average. I hope you voted in the poll.

 

[johndiver999]

No obviously not. It'd be 21/35 and 50%. In fact I mentioned that in the post, but you can't get over your trigger words and actually read.

The point is if you want to do decompression dives, you need to bring equipment, skills and knowledge appropriate for technical diving, to effectively manage the risk of decompression diving, and that technical diving equipment and procedures greatly reduce the risk. I can only speak to the GUE ones because I don't know what gas planning the other technical agencies do, but I'm pretty sure it's not sling a pony and hope.

No you are mistaken. I have done many decompression dives without all that gear, training or gas. In fact 2 of 3 dives I did today were short deco dives with a pony bottle while solo and one was to about 130 ft.

You don’t need all that stuff to do a little deco

 

[crofrog]

No you are mistaken. I have done many decompression dives without are that gear, training or gas. In fact 2 of 3 dives I did today were short deck dives with a pony bottle while solo and one was to about 130 ft.

You don’t need all that stuff to do a little deco

You do "to effectively manage the risk of decompression diving"

 

[Scared Silly]

No you are mistaken. I have done many decompression dives without are that gear, training or gas. In fact 2 of 3 dives I did today were short deck dives with a pony bottle while solo and one was to about 130 ft.

You don’t need all that stuff to do a little deco

No you are mistaken, you are doing deco with some knowledge, albeit poor knowledge.

'Good judgment comes from experience; experience comes from bad judgment' - Dr Kerr L White.

There is a great quote when diving in Chuuk in Truk Lagoon, "if your computer screen shows a view you have never seen, you are likely in deco." During the surface interval, one then sees said diver pouring over the computer manual.

 

[johndiver999]

No you are mistaken, you are doing deco with some knowledge, albeit poor knowledge.

'Good judgment comes from experience; experience comes from bad judgment' - Dr Kerr L White.

There is a great quote when diving in Chuuk in Truk Lagoon, "if your computer screen shows a view you have never seen, you are likely in deco." During the surface interval, one then sees said diver pouring over the computer manual.

LOL, a weird computer screen : today I started my third dive of the day and I take a quick peak a minute or two after reaching the bottom. For some reason, it is immediately showing like 1:57 (1 hour and 57 minute) ascent time (deco). This is the second time the computer has gone wacko, but it seemed to be reading depth perfectly.

I'm solo with an 85 tank with 32% and a pony . What to do?

I started the stopwatch on my G-shock and promise myself to start the ascent with at least 1000 psi and keep it less than 25 minutes of BT at around 100 + feet. Experience tells me this should be "about right" for a typical dive close to the blurry line.

I left the bottom showing 2:46 deco and got out with about 2:41 deco remaining. I did a very slow ascent above 50 feet, taking about 12-13 minutes for the entire ascent to the surface, with 5-6 minutes of that above 20 feet.

Experience - Bad judgement - Poor Knowledge ? Maybe?

 

[tursiops]

LOL, a weird computer screen : today I started my third dive of the day and I take a quick peak a minute or two after reaching the bottom. For some reason, it is immediately showing like 1:57 (1 hour and 57 minute) ascent time (deco). This is the second time the computer has gone wacko, but it seemed to be reading depth perfectly.

I'm solo with an 85 tank with 32% and a pony . What to do?

I started the stopwatch on my G-shock and promise myself to start the ascent with at least 1000 psi and keep it less than 25 minutes of BT at around 100 + feet. Experience tells me this should be "about right" for a typical dive close to the blurry line.

I left the bottom showing 2:46 deco and got out with about 2:41 deco remaining. I did a very slow ascent above 50 feet, taking about 12-13 minutes for the entire ascent to the surface, with 5-6 minutes of that above 20 feet.

Experience - Bad judgement - Poor Knowledge ? Maybe?

What computer are you using?

 

[johndiver999]

Some old one button, nitrox Oceanic?

 

[tursiops]

Some old one button, nitrox Oceanic?

The old Oceanics gave very long deco times, especially on repetitive dives. One of the problems of sliding into deco with recreational gear and procedures.

 

[johndiver999]

The old Oceanics gave very long deco times, especially on tepetitive dives. One of the problems of sliding into deco with recreational gear and procedures.

LOL not 2.5 hours after 2 min of BT after an hour SI... It is an error, if that is not obvious.