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Post by Terry on Sept 7, 2003 8:18:13 GMT -8
I have a question regrading tank pressure to be used for reg re-assembly and adjustment. What range of tank pressures do any of you use when you re-assemble and re-adjust your IP for a reg such as the USD AquaMaster DA or Voit Navy? Is there a tank pressure that would be considered too low for making these adjustments? The same questions would also apply for the re-adjustment of the sensitivity of the horseshoe assembly regarding contact with the LP diaphragm. These regs have a working pressure of 2250 psi. I'd be interested in any input that any of you have to offer. Thanks and Safe Diving To You! Terry
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Post by Captain on Sept 7, 2003 8:43:18 GMT -8
An old Navy diving manual I have specifies full tank pressure when setting second stage pressure. Second stage pressure should be 110 PSI + or - 5 PSI. Bleed down and reapply tank pressure several times to be sure pressure remains within range.
Captain
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Post by Terry on Sept 8, 2003 16:54:32 GMT -8
Thanks Captain for the info. I was sure that what you stated was the case, and that's how I've been doing my adjustments. However I did find it interesting in the schematics and repair / adjustment info I have that pertains to The USD Mistral. This info is in regards to checking for leaks where the pin enters the body and I quote: "Attach regulator to Aqua Lung tank. Turn on valve. Put soap water over pin. Check for bubbles at 2000 - 3000 psi." It has always been my belief that the yoke on this particular reg was never designed to handle working pressures over 2250 psi. Thought you might find this of interest. Anyway; thanks again for your input, and Safe Diving To You! Terry
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Post by Captain on Sept 8, 2003 19:44:12 GMT -8
In the 50's and 60's before aluminum tanks became common in sport diving the Navy was using double 80 cubic foot aluminum tanks rated for 3000 psi. Because of the non-magnetic property of aluminum these could be used when working with magneticly detonated mines. These tanks had a round bottom similar to the steel oxygen cylinders that many converted to diving use around that time.
I had some 50's era Navy manuals that picture and described these cylinders. Because of this I believe any Aquamaster of any age is safe to 3000 psi.
I didn't log on the first time I replyed to you so I came up as a guest. My name is Tom
Captain
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Post by Terry on Sept 8, 2003 20:22:32 GMT -8
Hey Tom; you're opening up the door to a topic that is in dire need of discussion - THANKS! That topic is the safe use of some of these older regs with tank pressures greater than 2250 psi. At times I've run across posts on different diver message boards and also been told by different people that the yokes on some of the older regs such as the AquaMaster DA are possibly not safe to use on 3000 psi tanks. The info you just mentioned about the Navy using twin 80's with 3000 psi in conjunction with these older regs is very interesting. I really hope this is the case. If so; that means more bottom times with our vintage two hosers, and that we can maintain them with one more original part (yoke) instead of changing the yoke to a more heavier duty one. Thanks for the info, and keep us posted if you find out anything else. Safe Diving To You! Terry Stevens
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