Bren Tierney
February 17th, 2003, 11:03 AM
Do you find it easier to conduct isolatations and shut-downs using 'Twinverts' or standardly configured twins?
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Bren Tierney February 17th, 2003, 11:03 AM Do you find it easier to conduct isolatations and shut-downs using 'Twinverts' or standardly configured twins? WreckWriter February 17th, 2003, 11:09 AM Not certain what a "twinvert" is. WW Bren Tierney February 17th, 2003, 11:20 AM 'Twinverts' = Inverted Twins. In this rig config you have the pillars, manifold and isolation valves all at (ahem) arse-level. Your (extra length) hoses are fed up through between (and then bungee-tied-off) the cylinders and then fed over your shoulder. This means that shut-downs are conducted by reaching behind you, to the small of your back/buttocks and then addressing the valves, instead of reaching over your shoulders and behind your head. nickjb February 17th, 2003, 11:20 AM inverted twinset? WreckWriter February 17th, 2003, 11:21 AM Thanks for the explanation. I've not used this setup. WW Bren Tierney February 17th, 2003, 11:37 AM Here ya go mate. Check this out. http://www.nigelhewitt.co.uk/snowy/sc6.jpg (http://) Some people find this really difficult to manage and others say it's ten times easier than standard config. What d'ya reckon? WreckWriter February 17th, 2003, 11:44 AM Bren Tierney once bubbled... Here ya go mate. Check this out. http://www.nigelhewitt.co.uk/snowy/sc6.jpg (http://) Some people find this really difficult to manage and others say it's ten times easier than standard config. What d'ya reckon? Interesting. My first thought was that you'd hammer the manifold but looks like that set has a good protective cage on it. I think there'd be increased drag with the butt end of the tanks forward, not sure how much though. Also trim characteristics would likely change. Interesting thought though, looks easy to manipulate valves, less chance of needing to also I guess. WW WYDT February 17th, 2003, 11:50 AM Wow, just my opinion but that looks like it would introduce a LOT of problems to fix one non-existant one. Just a few off the top of my head... 1. ALL custom length hoses 2. Crazy hose routing 3. Cage on the valves (unecessary entanglement hazard) 4. have to be independant (or can one use butt muscles to manipulate the isolator... nevermind... :wacko: ) 5. Can't hear a leaking 1st stage 6. Kind of goes along with #1 but one would now need a 9ft instead of a 7ft primary........ 7. Puts entanglement hazards (valves, cage) where you are MUCH more likely to become entangled.... WreckWriter February 17th, 2003, 11:54 AM WYDT once bubbled... Wow, just my opinion but that looks like it would introduce a LOT of problems to fix one non-existant one. Just a few off the top of my head... 1. ALL custom length hoses 2. Crazy hose routing 3. Cage on the valves (unecessary entanglement hazard) 4. have to be independant (or can one use butt muscles to manipulate the isolator... nevermind... :wacko: ) 5. Can't hear a leaking 1st stage 6. Kind of goes along with #1 but one would now need a 9ft instead of a 7ft primary........ 7. Puts entanglement hazards (valves, cage) where you are MUCH more likely to become entangled.... Excellent points, particularly about the isolator...... :) Not sure I agree on #7 though, seems less likely to entangle to me. Certainly harder to fix though if it happened. Personally will be keeping mine upright though! WW Divesherpa February 17th, 2003, 11:57 AM What a fantastic idea! They would be perfect for a rocking boat in the north Atlantic. If you sat down hard, you wouldn't have to worry about what type of entry you would do. You would be whisked into the air like James Bond. When you hit the water, there would be no worries over kick style as you have a DPV that's ready to go. WreckWriter February 17th, 2003, 11:58 AM Divesherpa once bubbled... you have a DPV that's ready to go. might be the first one to outrun a Gavin too :) WW DiverDave February 17th, 2003, 12:27 PM went to a tech talk a while ago and this issue was brought up. One major problem that was discussed was the difficulty in getting to the valves when you start adding in side mounts. WYDT February 17th, 2003, 03:12 PM DiverDave once bubbled... went to a tech talk a while ago and this issue was brought up. One major problem that was discussed was the difficulty in getting to the valves when you start adding in side mounts. Yeah, I didn't think of that one Dave. Almost all of the dives I do now I have at least one AL80 stage and many times two... don't think I'd be able to reach those valves with two stages on. This I think is one of those things that looks like a good idea on the surface but if you really stop and think about it the "good" becomes bad pretty quickly. WW.. The reason I think it's more likely to be an entanglement hazard is due to where it's at. With the valves behind your head you're much more likely to see what's coming and avoid it. I sure wouldn't want to get in a tight place in a cave with that setup... they way that cage is on there it could "lock" you into a spot pretty good. I'm not even going to start on the tank boots in the pic..... haha.. Aquamaniac February 17th, 2003, 03:33 PM Fair go Rob, the boots are there to protect his head................ roturner February 17th, 2003, 05:07 PM Aquamaniac once bubbled... Fair go Rob, the boots are there to protect his head................ To be fair to the diver in question he damaged his shoulder(s) in a motorcycle accident and he can't raise his arm up high enough to do a shutdown. R.. madmole February 18th, 2003, 04:36 AM Could also be because its a legal requirement of the new UK2002 Tank regs that ALL tanks have a means of self standing (ie boots):( They really thought that one through eh?, how are stages and Inspiration tanks gonna fair with boots on Tibbs February 18th, 2003, 03:59 PM From what I've heard, it only really applies when being tested. So, for me it's going to be a case of take cylinders to place of testing, take cylinders out of car, put boots on, get them tested. Retrieve cylinders, remove boots, go diving. If they're HSE regs, they don't apply to amateur diving anyway... Chris madmole February 18th, 2003, 04:03 PM Unfortunately the dive shop doing the pumping IS covered by the HSE as they are charging for it Yep, I can see a side line in Loaner tank boots for each shop MattBin February 23rd, 2005, 01:39 PM Guys, I'll add to this as I do use a set similar to Nigel's. First off the isolator is rarely used as the first stage valves are very easy to shutdown and as most problems are a 1st stage freeflow its solved quickly and easily. The centre Isolator can be angled so that makes reaching it easy too. Length of tanks can sometimes make sitting on a boat difficult but I use long 10's so its not an issue. Hose routing - wing inflate up through the tanks and over shoulder. 1st stage primary across chest and hog looped, 1st stage secondary - up around back of tanks and bungeed under chin after passing over right shoulder. No nightmare hose routings honest. The only non standard hose is the wing inflate. The d/s feed is passed under right arm and up into the valve. I also have mobility problems and I like the ability to be able to very easily throttle on/off the tank valves "IF" I get a free flow. Incidentally the Police and the Navy divers and the fire brigade all use this inverted policy. You know the tanks only went valve up because the old twin hoses were easy to route around the neck/head to feed the dv when they fitted the 1st stage to the tank. So please guys dont hammer something unless you have tried it - it doesnt all have to be a one size fits all sport you know. Best wishes Matt sailingking February 27th, 2005, 10:54 PM Wouldn't the 7 foot hose would be shorter not longer. Say 5 feet.
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