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Post by ironcross on Jan 8, 2008 3:42:33 GMT -8
Can the DA (with a good seat) withstand (and perform) properly with 3,000 psi tank pressure? Some say yes while other's say no - that only a Royal can withstand and perform with those kinds of pressures.
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Post by Broxton Carol on Jan 8, 2008 6:36:56 GMT -8
Why expose it to something it was never meant to do? Are you a vintage diver or not. Who cares if a royal can hold 3000 psi? If thats the way you want to go so be it, but its amazing how well this stuff works on 2250 psi, and will until the end of the world.  |
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Post by luis on Jan 8, 2008 7:27:55 GMT -8
Can it be used at 3000 psi? The answer is yes.
The Navy used them extensively for a long time with their 3000 psi round bottom aluminum twin tanks. Be aware that the Navy did have plenty of spare first stage seats at that time. The higher pressure will add some wear at the seat, but I don't know how significant.
There is also a small concern about the old short yokes at these kinds of pressures, but IMHO that is not a big problem. Again the Navy used them with 3000 psi.
Personally, if I have a choice, I would not use it all the time with the 3000 psi, just because at the moment we don’t have reproduction or replacement HP seats. At the moment we need to preserve the HP seats as best as possible.
The DA Aqua Master (or any DA) will also not breathe as well at higher pressures. The unbalanced diaphragm (upstream first stage valve) will produce a lower intermediate pressure at higher tank pressures.
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Post by Broxton Carol on Jan 8, 2008 8:19:10 GMT -8
Luis is right. I wasent thinking of navy application. Anything stretched to the limit has more chance of failure. Those big navy doubles. does anyone have or is using them? I would think those would be very rare! A collectors prize!
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Post by scubadiverbob on Jan 9, 2008 14:03:51 GMT -8
What's your yoke rated at? I have a teflon seat in my DA; but, only use 2250 in my tank; 'cause, I don't want my yoke stretched to where it can't be used.
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Post by luis on Jan 11, 2008 7:25:29 GMT -8
What's your yoke rated at? I have a teflon seat in my DA; but, only use 2250 in my tank; 'cause, I don't want my yoke stretched to where it can't be used. Before the yoke experiences any permanent deformation (a.k.a. plastic deformation) it will experience enough elastic deformation to blow the O-ring. Elastic deformation returns once the load is removed. To cause permanent deformation you probably have to crank the heck out of the yoke screw and then apply a very high load. The standard long yoke is more than adequate to 3000psi and probably 3500 psi without a problem (I can do some calculations if someone really wants to find out). Unless there is a defect on a yoke the normal failure mode would a blown O-ring due slight elastic stretch of the yoke. But, the yoke should not incur any permanent deformation or damage due to slightly higher pressures. I am fairly certain that the original seats on the Aqua Masters were nylon, not Teflon. I may be wrong, but I don’t believe that Teflon was used in this type of consumer products until later (the Aqua Master was long gone by then). |
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