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Post by caveman on Jan 8, 2007 16:24:58 GMT -8
Twin OMS 85's Weigh the same and give the same dive profile as a set of steel 72's. The tanks are aprox the same size and Have the round bottoms like the old 72's. If filled up to 2250 instead of 2640 they have aprox 72 cuft of air. Gray in color they can look and dive real vintage with the proper manifold. (just my 2 cents worth)
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Post by sea.explorer on Jan 8, 2007 18:32:42 GMT -8
Here is what you need: -Holds almost 250cf of air -Were used with Double Hose Regs -Only weighs 108lbs empty -Ryan
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Post by caveman on Jan 8, 2007 18:40:02 GMT -8
3400 PSI in my 108's will get me 278 cuft of air. Makes for a good dive.
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Post by caveman on Jan 8, 2007 18:40:57 GMT -8
However, the triples do look MUCH more cool.
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Post by ductapeman on Jan 9, 2007 15:50:10 GMT -8
Oh man, I love the triples!! Can they be palletized for a fork lift? (Do they allow fork lifts on dive boats?? )
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Post by caveman on Jan 9, 2007 15:57:55 GMT -8
What is the working pressure of those big ol' triples? They do look awesome.
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Post by SeaRat on Jan 9, 2007 18:30:57 GMT -8
Ryan,
What is the second knob on the right side of the valve for? Could that be an on-off valve for the right cylinder, rather than a J-Reserve?
John
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Post by sea.explorer on Jan 9, 2007 19:09:18 GMT -8
The rated pressure of the tanks is 200bar or about 2900 PSI. You could definitely overfill them to boost the volume significantly beyond 250cf. Especially if you fill them like those cave divers are famous for John, the second valve is an on/off for the third tank which was used as a 1/3 reserve, as was the Cousteau preference. Filled with a Heliox blend this set was used on the first dives on the Britannic in 1976. They dove with Spiro Royal Mistrals to a max depth of 390ft. You can see them in person at Our World Underwater Feb 9-11 in Chicago. This set is on loan to me from the Cousteau Society. -Ryan
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Post by Michel on Feb 18, 2007 11:41:59 GMT -8
Hi Ryan,
I seem to remember the Cousteau team wearing a similar tripple set-up while also using the submersible Galeazzi tower for decompression.The triple set-up was yellow and very large and the reg(doublehose) was placed off center on one of the end tanks.This was around 1971 and seems that the hoses were terribly stretched on the one side! You would think that the team would have had the resources to have a center mounted reg manifold for this set up,any info on the why they did it that way? Thanks, Michel A.
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Post by Twintank on Apr 20, 2008 11:19:49 GMT -8
Question about Cousteau's double and tripple tank sets. Jean Grepinet, member of the Historical Diving Society of France told me that Cousteau's tanks were filled with a maximum pressure of 150 bar, their volume was 7 liters per tank.
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Post by sea.explorer on Apr 20, 2008 19:45:17 GMT -8
Cousteau & Co used a lot of different tank sets over the years with ratings up to 5000psi (345 BAR) . For more specifics I would need to know which set you are referring to. -Ryan
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wd8cdh
Regular Diver
Posts: 35
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Post by wd8cdh on Apr 21, 2008 11:29:26 GMT -8
Hi, I'm getting back into diving in general and the old US Divers twin-hose rigs in particular after a (very) long absence, and I've been wondering about what sizes of tanks are suitable for a twin-tank setup? I've seen, or guessed at, 38s, 63s and 72s-- very interested in hearing the pros and cons of these, or other, setups. And as a side note, something has been really bugging me for a long time: what size are those tanks that the Cousteau crew used in the triple-tank lashup??? Thanks in advance for any help-- Lee Hi Lee, I am a huge fan of small multiple tank rigs. I currently have double 40s, triple 40s, triple 20s, quad 20s and double 35s. As far as Cousteau systems here is some info: 1966 thru 1976, The classic yellow Hydrodynamic backpack with the chest mounted regulator ~120CF total 4 steel tanks about 4.25" diameter 3000psi 19??-??, triple tanks no shell. ~90CF Same tanks as above 3000psi yoke fitting 1977-82 Technosub RAID system in yellow or silver ~144CF total 2 Faber steel 10L tanks about 6.75" diameter 3000psi 2 yoke fittings 1986-1999 slim silver backpack Type 1 - ~160CF 4 hoop wraped steel tanks 3.5" diameter 4500-5000psi yoke or DIN fitting Type 2 - ~160CF 4 titanium tanks 3.5" diameter 5000psi DIN or yoke fitting Did I get this right Ryan?
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Post by sea.explorer on Apr 22, 2008 4:52:01 GMT -8
Looks good to me. -Ryan
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Post by Twintank on Apr 27, 2008 11:40:05 GMT -8
Hi! There is another important aspect to think about when using twin tanks. Two tanks are not much heavier than one tank with the same volume as your twins. Nonetheless twins are easier to carry on your back since their diameter is significantly smaller than the diameter of a equivalent single tank.
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Post by SeaRat on Apr 28, 2008 19:00:01 GMT -8
Hi! There is another important aspect to think about when using twin tanks. Two tanks are not much heavier than one tank with the same volume as your twins. Nonetheless twins are easier to carry on your back since their diameter is significantly smaller than the diameter of a equivalent single tank. Twins are also easier to roll with in the water than a very large single tank. John
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