spoolin01
Contributor
No, I see no value to it for rec diving, other than amusement between dives.
Do you use your SAC for anything? POLL
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SAC rate measured over numerous dives gives you a very good idea of how much air you will use over time. I think a rate tested at the surface is pretty useless but can be a good starting point. In tech diving consumption rates are used to plan gas reserves and total gas needed for dives. On recreations dives I use some quick averages to determine tank size needed.
ajduplessis
Contributor
I use my SAC all the time to calculate gas matching/planning.
pnw_diver
Contributor
I don't tech dive (yet), but I do use SAC rate (recorded after every dive) to plan air consumption, rock bottom and turnaround pressure (given the dive plan).
I'm at a point where at any given point in a time (based on elapsed time), I can predict within 100-150 PSI where my tank pressure is at.
Works for me.
I'm at a point where at any given point in a time (based on elapsed time), I can predict within 100-150 PSI where my tank pressure is at.
Works for me.
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Nope. Never used it.
I take 80 cu ft, or 100, or 120, or 130. When its time to come up, I come up.
That's just me.
I take 80 cu ft, or 100, or 120, or 130. When its time to come up, I come up.
That's just me.
I had not thought of doing that....problem is, I just slow down when narc'ed, so at say 130 ft, I would be using up the whole dive figuring out my usage....
Thank goodness for trimix.
Thank goodness for trimix.
European holiday diving (Metric), my SAC is 16-20 litres/min. I know the variables that affect this, & my buddies SAC 11-15 litres/min. Result I normally dive a single 15 Litre Nitrox 32, he uses twin 5 litre (prefering the balance).
Maybe 1 dive per holiday would be below 22 metres, when I would use a 12 litre max. Does this answer the survey?
Maybe 1 dive per holiday would be below 22 metres, when I would use a 12 litre max. Does this answer the survey?
Just out of interest aquaregia what do you mean by "working SAC"? Is that your SAC while swimming or something more strenuous than that?
Slamfire
Contributor
I'm not aquaregia, so forgive the intrusion. When you plan for deco dives it is common to use 2 different SAC rates:
1. Working SAC rate -- for the non-deco portion of the dive when you might be swimming or moving around with a regular degree of physical activity
2. Deco SAC rate -- for the deco portion when you are not supposed to be doing a lot of physical activity. You are supposed to stay mostly idle while offgasing.
Logically, your working sac rate will be greater than the deco sac rate.
1. Working SAC rate -- for the non-deco portion of the dive when you might be swimming or moving around with a regular degree of physical activity
2. Deco SAC rate -- for the deco portion when you are not supposed to be doing a lot of physical activity. You are supposed to stay mostly idle while offgasing.
Logically, your working sac rate will be greater than the deco sac rate.
CamG
Contributor
Greetings LakeCountyDiver I personally use SAC to plan most every dive not just DECO dives.
As Slamfire has mentioned actually on a DECO dive there several different SAC rates one needs to address to plan your dive conservatism in terms of gas.
Some may feel that is over kill for REC dives but it adds fun to the dive for me and keeps me sharp using the calculations and applying the plan vs the post dive debrief.
My interest in this has lead me to some pretty interesting tests personally.
I have found that in some instances two smaller tanks will get you further than two large tanks. How did I determine this? SAC rate and trail and error.
One of the greatest parts of diving for me is to always seek out new things learning the whole time.
Some people like to veg out and I am not talking badly or making fun if that is what they enjoy then that is awesome. Being slightly OCD is not for everyone and thank God for that!
What it does for me is gives me a outlet for my crazy fast thinking brain where no sound is there to distract me only the sound of my breathing.
It is probably the reason that cave diving has been so enjoyable for me because you are always thinking. Awesome! Not for everyone.
CamG Keep diving....Keep training....Keep learning!
As Slamfire has mentioned actually on a DECO dive there several different SAC rates one needs to address to plan your dive conservatism in terms of gas.
Some may feel that is over kill for REC dives but it adds fun to the dive for me and keeps me sharp using the calculations and applying the plan vs the post dive debrief.
My interest in this has lead me to some pretty interesting tests personally.
I have found that in some instances two smaller tanks will get you further than two large tanks. How did I determine this? SAC rate and trail and error.
One of the greatest parts of diving for me is to always seek out new things learning the whole time.
Some people like to veg out and I am not talking badly or making fun if that is what they enjoy then that is awesome. Being slightly OCD is not for everyone and thank God for that!
What it does for me is gives me a outlet for my crazy fast thinking brain where no sound is there to distract me only the sound of my breathing.
It is probably the reason that cave diving has been so enjoyable for me because you are always thinking. Awesome! Not for everyone.
CamG Keep diving....Keep training....Keep learning!
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