convert LPM to cubic feet per minute

**Monkey** · 25th July 2007, 03:07

what is the formula for converting an RMV in lpm to cu ft.?

so what would 1.25 lpm equate to?

thanks

BAM

and how do you convert a 3L tank to cubic feet?

kieranu · 25th July 2007, 03:29

For cylinder size conversions, I refer you to this thread my friend:

http://www.rebreatherworld.com/new-r...der-sizes.html

The same conversion can be used for RMV, e.g.

Convert cf into free liters using: cf * 28.3 = free liters

so 1.25lpm = .044 cuft/minute

You can also download the trial version of V Planner and have a play in metric and imperial modes.

V-Planner VPM & VPM-B dive decompression software

cramerdn · 25th July 2007, 04:00

or better yet do everything in liters, liters per minute, bar, and meters and live a happy life.

I took a trimix course last weekend and my instructor was figuring his preasure needed in his al 80s without bothering to use the water capacity and using 80 cu ft even after I mentioned that they are really 77 cu ft tanks. His answer? "I figured my RMV using 80 cu ft as the tank volume so now I use it to calculate the psi needed for the dive." Maddness.

**Monkey** · 25th July 2007, 04:12

Quote: (Originally Posted by cramerdn)

or better yet do everything in liters, liters per minute, bar, and meters and live a happy life.

I took a trimix course last weekend and my instructor was figuring his preasure needed in his al 80s without bothering to use the water capacity and using 80 cu ft even after I mentioned that they are really 77 cu ft tanks. His answer? "I figured my RMV using 80 cu ft as the tank volume so now I use it to calculate the psi needed for the dive." Maddness.

after looking at the metric formulas.... imperial sucks... us americans do things the hard way don't we?

thanks for your help

cramerdn · 25th July 2007, 05:18

I was 4 hours into my first tech diving course when I saw the light.

25th July 2007, 03:07	#1 (permalink)
Monkey Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2006 Location: Lauderdale By The Sea Florida Posts: 417	convert LPM to cubic feet per minute what is the formula for converting an RMV in lpm to cu ft.? so what would 1.25 lpm equate to? thanks BAM and how do you convert a 3L tank to cubic feet?
(Online)

25th July 2007, 03:29	#2 (permalink)
kieranu Apprentice Meg Pilot Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: WA, Australia Posts: 237	Re: convert LPM to cubic feet per minute For cylinder size conversions, I refer you to this thread my friend: http://www.rebreatherworld.com/new-r...der-sizes.html The same conversion can be used for RMV, e.g. Convert cf into free liters using: *cf 28.3 = free liters** so 1.25lpm = .044 cuft/minute You can also download the trial version of V Planner and have a play in metric and imperial modes. V-Planner VPM & VPM-B dive decompression software
(Offline)

25th July 2007, 04:00	#3 (permalink)
cramerdn Obey my dog! Current Rebreather/s: Evolution Dolphin Other Rebreather/s: Dolphin Join Date: Dec 2006 Location: Townsville QLD Posts: 613	Re: convert LPM to cubic feet per minute or better yet do everything in liters, liters per minute, bar, and meters and live a happy life. I took a trimix course last weekend and my instructor was figuring his preasure needed in his al 80s without bothering to use the water capacity and using 80 cu ft even after I mentioned that they are really 77 cu ft tanks. His answer? "I figured my RMV using 80 cu ft as the tank volume so now I use it to calculate the psi needed for the dive." Maddness. __________________ "Its better to live one day as a tiger than an entire life as a worm." "But who's ever heard of a worm skin rug?"
(Online)

25th July 2007, 04:12	#4 (permalink)
Monkey Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2006 Location: Lauderdale By The Sea Florida Posts: 417	Re: convert LPM to cubic feet per minute Quote: (Originally Posted by cramerdn) or better yet do everything in liters, liters per minute, bar, and meters and live a happy life. I took a trimix course last weekend and my instructor was figuring his preasure needed in his al 80s without bothering to use the water capacity and using 80 cu ft even after I mentioned that they are really 77 cu ft tanks. His answer? "I figured my RMV using 80 cu ft as the tank volume so now I use it to calculate the psi needed for the dive." Maddness. after looking at the metric formulas.... imperial sucks... us americans do things the hard way don't we? thanks for your help
(Online)

25th July 2007, 05:18	#5 (permalink)
cramerdn Obey my dog! Current Rebreather/s: Evolution Dolphin Other Rebreather/s: Dolphin Join Date: Dec 2006 Location: Townsville QLD Posts: 613	Re: convert LPM to cubic feet per minute I was 4 hours into my first tech diving course when I saw the light. __________________ "Its better to live one day as a tiger than an entire life as a worm." "But who's ever heard of a worm skin rug?"
(Online)

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