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Post by Michel on May 26, 2021 5:07:31 GMT -8
WOW! I think you're quite right, almost scary by today's safety standards and consciousness. By comparison I thought in my youth that I was brave diving my twin 72s (which I still dive(my poor back!))in deep dives with 144cuft of air! It's no wonder that US navy seals and the Royal Canadian NAVY dive teams use twin 80s and also the NASA immersion pool divers. Thanks again for the heads up and the close up pics of Cousteau's triples. Michel.
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Post by SeaRat on May 26, 2021 8:56:45 GMT -8
WOW! I think you're quite right, almost scary by today's safety standards and consciousness. By comparison I thought in my youth that I was brave diving my twin 72s (which I still dive(my poor back!))in deep dives with 144cuft of air! It's no wonder that US navy seals and the Royal Canadian NAVY dive teams use twin 80s and also the NASA immersion pool divers. Thanks again for the heads up and the close up pics of Cousteau's triples. Michel. Michel, Just so you'll know, your twin 72s aren't 144 cubic feet. The steel 72 only holds 71.2 cubic feet of air at 2475 psig. They are rated at 2250 psig, and when new with a "+" rating can be filled to 2475 psig. So how much do they really have? 71.2 ft3 / 2475 psig = X / 2250 psig (71.2 ft3 * 2250) / 2475 psig = X X = 64.73 ft3 So your twin 72s actually held only 129.45 ft3 of air, not 144 ft3. PJ Okinawa Dive002 by John Ratliff, on Flickr USAF Pararessueman Terry Wetzel using twin 72s on the reef off Okinawa in 1968. This is close to Memorial Day, and Terry has now passed. He died of lung/brain cancer because of both smoking and exposure to Agent Orange in Vietnam. Rest in Peace, Terry. John
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Post by snark3 on May 26, 2021 10:03:15 GMT -8
snark3 It looks like we have a similar set of triples with the outside thread tanks Yes we do. I actually have 2 sets of these. I had a third set, but sold one for $100 more than I paid for all three sets. Now if I can find someone to Hydro them. Mine are 2100 PSI, I believe about 35 cuft ea.
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Post by Michel on May 26, 2021 10:48:47 GMT -8
WOW! I think you're quite right, almost scary by today's safety standards and consciousness. By comparison I thought in my youth that I was brave diving my twin 72s (which I still dive(my poor back!))in deep dives with 144cuft of air! It's no wonder that US navy seals and the Royal Canadian NAVY dive teams use twin 80s and also the NASA immersion pool divers. Thanks again for the heads up and the close up pics of Cousteau's triples. Michel. Michel, Just so you'll know, your twin 72s aren't 144 cubic feet. The steel 72 only holds 71.2 cubic feet of air at 2475 psig. They are rated at 2250 psig, and when new with a "+" rating can be filled to 2475 psig. So how much do they really have? 71.2 ft3 / 2475 psig = X / 2250 psig (71.2 ft3 * 2250) / 2475 psig = X X = 64.73 ft3 So your twin 72s actually held only 129.45 ft3 of air, not 144 ft3. PJ Okinawa Dive002 by John Ratliff, on Flickr USAF Pararessueman Terry Wetzel using twin 72s on the reef off Okinawa in 1968. This is close to Memorial Day, and Terry has now passed. He died of lung/brain cancer because of both smoking and exposure to Agent Orange in Vietnam. Rest in Peace, Terry. John Of course you are quite correct! I've always kind of rounded out the cu.ft. amount for laziness sake but still better than Cousteau's triples with a fairly good margin of safety. I always fill mine to 2300psi which I think is a good compromise and seems to be useful for longevity on the various seats in my DH regs,I remember u mentioning that in your day in the paras it was no problem using close to 3000psi with aqua-masters since the AF/Navy had no issues with seat availability!What do u think should be the proper protocol today in your opinion? Michel.
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Post by scubalawyer on May 26, 2021 12:34:26 GMT -8
The closest I've gotten to actually diving three aluminum 80's have been cave dives in Akumal, Mexico. In fact, with two stages and back-gas I've actually dove 4 aluminum 80's at the same time. Here is a short video a friend took of me on a stage dive in Mexico a few years ago.
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Post by SeaRat on May 26, 2021 19:01:37 GMT -8
Wow, what a beautiful cave for that dive. Thanks for the video!
John
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Post by SeaRat on Jun 1, 2021 13:46:02 GMT -8
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