wd8cdh
Regular Diver
Posts: 35
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Post by wd8cdh on Mar 10, 2008 11:39:48 GMT -8
Another good triple setup is to double two tanks with a manifold with regulator fittings above the tanks and add the third tank as an independant "1/3" for emergencies. This allows placement of a double hose regulator in the center of the three tanks and single hose regulators on the other fittings are just for backup.
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Post by technidiver on Feb 27, 2019 20:25:43 GMT -8
Personally, I think that more problems have been caused by the isolation valve being off or on at the wrong time than there have been problems that could have been saved by an isolation valve. Therefore, I slightly prefer manifolds that don't have isolation valves. Older manifolds like the Nimrod and Sherwood mentioned before are great on double 72's and have the correct spacing for vintage bands. If you want new, Thermo makes a crossover manifold WITHOUT isolation that is the same spacing as the older manifolds for 72's. The center bar is part number 8004. www.thermovalves.com/manifold_center_bar.htmDive right also makes a double manifold WITH isolation that is the same spacing as the older manifolds. It is "200 Bar 5.5" Tank Manifold #VA3003-200" www.diverite.com/products/catalog/valves/va3003-200Both of those manifolds have two regulator fittings but neither is in the center. I am trying to get a center secetion with a regulator fitting out of a company in Europe that will replace the isolator section of a double manifold. Thanks Joe, I've been thinking about the manifold thing, and am going to tell you about another potential for triples. I've said this before, but sometimes it gets lost in as the threads become things of the past. It is possible to use these kinds of manifolds, with the regulator fittings on top of the cylinder, as a setup for triples. If you can get a set of doubles that is fit close together, then put another cylinder on the right side upside down. Use the center post of the triples (right side of the double manifold) to put the double hose regulator. On the upside-down cylinder, put a first stage of a single hose regulator, set at the exact interstage pressure as the double hose, and hook the LP port of this first stage into the LP port of the double hose regulator. I'm assuming either a Royal Aquamaster or Pheonix Royal Aquamaster with a set of LP ports is being used (or in my case, a Trieste II). The two regulators can be hooked together with two normal LP single hoses, and the demand valve housing off an MR-12 regulator This is the seat of the MR-12, which is reversible so that a female end from the LP hose can fit into both sides of the housing, and it swivels too. This would leave LP sites on the reserve cylinder (the upside down one), and an unused site on the left cylinder for a separate regulator if desired. The redundancy of this triple-tank system would be fantastic, with triple, separated air supplies (duel most of the time, unless the isolation was used for the double manifold). It would also be in keeping with Cousteau & Gagnan's original patent concept for the Aqua Lung, with triple cylinders that did not depend upon gauges to tell you the state of the air supply. Cousteau himself enjoyed the triple tank system a lot. This is shown by his continued use of it in the production of the movie, World Without Sun[/I]. He did not use them on-camera, but for his off-camera dives he did use the triples (see page 62 of the book of the same name). There is also one scene, which is quite difficult to tell because of the angle, which the triple tank system was still used in that movie. Cousteau is shown on page 201 of that book using the quads too. So the transition away from the triple tank system for Cousteau was about 1963, when they went to the quads, then the integrated scuba systems using quads, and the rest of the crew using the La Spiro doubles. There was a series of dives later, on a deep shipwreck in the early 1970s where the Cousteau divers again used triple tank systems, this time in conjunction with a submersible decompression chamber, where they housed the units on the outside of the chamber. John[/quote] John, I know it's 11 years later but this post contains viable information which I intend to use to the best of my ability. I have a DAAM and a hookah port, as well as an MR-12 second stage laying around and some LP hoses. My question regarding using two air sources for the DAAM is that wouldn't the air from the hookah leak back into the first stage? I've never tried it but that's my logical thought. I have no idea where it would go after that. The o-ring to yoke seal is tight, so it probably wouldn't leak out. Just thinking out loud. To all of you, chime in if you have a chance to read Johns idea. TD
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Post by technidiver on Feb 27, 2019 20:27:09 GMT -8
Weird, I didn't see this post populate in the general discussion as a new thread.
TD
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Post by SeaRat on Feb 27, 2019 20:52:52 GMT -8
Weird, I didn't see this post populate in the general discussion as a new thread. TD TD, Your wish is my command. John
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Post by technidiver on Feb 28, 2019 3:39:31 GMT -8
Weird, I didn't see this post populate in the general discussion as a new thread. TD TD, Your wish is my command. John Thanks John! TD
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Post by technidiver on Feb 28, 2019 20:07:35 GMT -8
Conducted the experiment in the way that John layer out. Had two steel 72s, one with a Dacor 400 with the lp connector hose connected to a port with the others blocked, and another with my DAAM and hookah port adapter. Got the IP just right by doing it blind without gauges (always have done it that way, no IP gauge in my inventory ATM) and I would say that the experiment was a great success. No leakage of air after IP was adjusted and the crossover allowed for both regs to function with the opposite air source shut off. The Dacor gave more air flow than the DAAM, but that's for obvious reasons. After all, it is THE Davor 400.
I'm going to pick up another 72 this year and some more vintage bands and perhaps make a triple tank setup with a layout that would involve isolation for each tank, etc.
To be honest, this may be my way of diving doubles now, as independents with an LP crossover.
TD
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Deleted
Deleted Member
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Post by Deleted on Mar 1, 2019 8:48:36 GMT -8
I posted this before on another thread. Another source for twin tank setups comes from Wells Marine Divers based in New Taipei City, Taiwan. You can find pretty much any configuration your heart desires in their catalog (see below link) and have your local Dive shop contact them or contact them yourself....they sold directly to me when I was needing the internals for my MB-Mk3 project.......their cost would be cheaper than anything stateside.........then add the exorbitant shipping from over there plus the dive shop costs ....or do the whole purchase thing yourself and save the middle man bucks.... By the looks of the photos, these are adjustable to different tank diameters.....center posts, one outboard post, twin outboard posts....posts for DIN or with DIN/Yoke plugs.........other weird setups...etc. www.wmd.com.tw/products/list/20ol'mossback
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Post by technidiver on Mar 1, 2019 8:55:00 GMT -8
Mossback, what was the shipping like to the US? They do have some good products, like the Benjamin manifold, as well as the Center post manifolds. They do look good.
Do they accept paypal?
TD
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Deleted
Deleted Member
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Post by Deleted on Mar 1, 2019 9:26:21 GMT -8
Mossback, what was the shipping like to the US? They do have some good products, like the Benjamin manifold, as well as the Center post manifolds. They do look good. Do they accept paypal? TD The last time I used them.....2014, they accepted wire transfers only........but that may have changed. Mainland Chinese company's use paypal so their policies may have changed as well. By the way, Taiwanese are not Chinese so don't call them Chinese .....they might shoot you for that. When/if you write them, ask for Maggie.....sales-m/WMD.com.tw
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