How Deep

[Rickoz]

Sorry but i'll have to talk in liters.
How do we work out how deep we can breath with the 1st stage that we/i'm using.
Lets say i'm using a ScubaPro MK20 (well i am )
I think they pump out 1850 l/m.
Now i think we need to know one or two other things breathing rate &
Thanks for any help Rick.

 

[100days-a-year]

Rickoz,unless your looking for a number just for fun the limiting factors on deep diving are logistics,human physiology and cost.The piece of gear you're talking about will breathe deeper than humans have been on open circuit scuba .For a little exercise you could figure the max depths based on gas density vs.fow rate vs deltaP of gas vs.depth .For all practical purposes the answer would be "as deep as you wanna go"

 

[Arduous]

100days-a-year is telling you straight. That ScubaPro will breath deeper than you will ever go.

 

[Bob3]

Yep, your breathing medium will start getting too thick to breathe someplace past 1200'. 1800' & heliox is like syrup.

 

[devjr]

Rick, that number sounds high. It is probably based on the internal bore size of the SP flow through piston. This piston bore is larger than the internal bore of many tank valves and is more of an advertising concept than anything. A more realistic number would be about 800 ltrs per minute for a single hose regulator with average hose length. At this rate a tank would be drained in about 3 minutes, that is if the reg did not freeze solid first.