What constitutes high pressure?

[Bigd2722]

For me, high pressure is 3500 or higher and requires a 300 Din connection. I see where the dual valve (threaded insert) and 3442 is marketed as high pressure and can be used with a yoke connection. I don't buy that sales pitch. Opionions?

 

[Scared Silly]

Technically you are correct ... but to get around the requirement that for true HP (>3500psi) one needs a 7 thread 300 bar connection the mfg came up with the 3442psi which allows a 5 thread 200 bar connect or a yoke connection. And thus could sell a 3442 as a "high pressure" cylinder. Kinda of like when the Al 80 came out - even though they hold 77.4 cuft they still call them 80 cuft cylinders.

 

[Superlyte27]

I'm not sure I understand the issue. 200 Bar valves will easily handle 4000PSI as will 300 Bar valves.

 

[Scared Silly]

200/300 bar valves are a nomenclature - they have nothing to do with actual mechanical strength. It is only the first two threads that mechanically secure the valve.

 

[Leadking]

I think the recreational dive industry believes anything above 3000psi.

 

[oxyhacker]

The only "official" definition is the DOT's, which says HP is 900 psi or over.

I personally draw the line at 3300 psi, since it puts the oddball "slightly over 3000" short-fill specials like the compact 80s and 71.4 Faber/Scubapros in the lower category, where they belong, but groups the 3442 psi tanks with the "real" HPs, which is what they really are, being bastard, slightly derated 3500 psi tanks.