Class A Ratings

[Wormil]

http://www.edge-gear.com/v/vspfiles/assets/images/anstitestsystems-hogwd1coldhightank.jpg

Flathead-VI @ 62.5lpm - Zeagle Dive Systems

Given those two links, could anyone explain to me how to determine the work of breathing and how to understand what numbers on them makes them meet or exceed the Naval Class A rating?

Thanks!

 

[mike_s]

U.S. Navy’s Class A test depth and breathing rate is 62.5 RMV @ 198 FEET


This will explain how some of what's on the above charts

http://www.divelab.com/assets/pdf/technical/Regulator_Performance.pdf

Work of Breathing: “WOB” the amount of effort to breath, expressed in
Joule’s per liter abbreviated as J/L. The lower the J/L the better regulator
breathes. External work of breathing is expressed on the ANSTI loop as external
work (EXT). External work of breathing is the sum of the inhalation and
exhalation effort expressed in J/L. External work is the work effort required to
operate the breathing apparatus only.​

Given those two links, could anyone explain to me how to determine the work of breathing and how to understand what numbers on them makes them meet or exceed the Naval Class A rating?

The Navy Class A rating is around 1.4 J/l at 62.5 RMV @ 198 FEET.

Both of these regulators above exceed the Navy Standard for Class A regulators. They are both below 1 Joule per liter at that test.

so both of these are "great breathers". Seems the Hog is slightly better than at .74 J/l over the Zeagle at .91 J/l. But I doubt that any human could ever tell the difference on breathing it.


BTW... 62.5 RMV @ 198 FEET is "whale lungs". Not sure Michael Phelps could do that.

 

[Wormil]

Well, I noticed the HOG test is for 50m and a pressure of almost 3k where the Zeagle's was at 750 psi and 60m.

 

[mike_s]

Well, I noticed the HOG test is for 50m and a pressure of almost 3k where the Zeagle's was at 750 psi and 60m.

I noticed the pressure differences also. But notice the Zeagle was tested in 2004 and the Hog last year. Not sure if they've changed their requirements for the test, or if they even had the same "baseline" for the test.

The test range of 725-760 psi is to meet the EN250 Standard.


I have a feeling the Zeagle Reg was tested in 2004 for this article in ScubaDiving magazine and that's where the results came from. They don't list the results with the pressures that year, but other years they specify that it's tested between 725-760 psi.

Class of 2004 | Scuba Diving Magazine


the 2009 magazine test mentions those standards of 725-760 psi.
ScubaLab: Top Regulators of 2009 | Scuba Diving Magazine

 

[Wormil]

lol@Ocean Master Deep Limit Brass Plus