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DIR Kit questions Agonising over what to buy, ask other divers what they have done and what they have found. Bought something great or new - tell us.
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June 10th, 2009, 02:48 PM
| #1 (permalink) |
| New Member  Join Date: May 2009 Location: Geneva, Switzerland
Posts: 23
 | Dear All, In the DIR equipment, only one SPG is required with a manifold...what happened if the left tank is bursting ? I would have to shut both the manifold and the tank down and will stay only with one tank (on the right ) without any SPG. Don't you think a secong SPG could be a valuable redundant instrument in case of such failure? Thanks in advance for your hints. JM |
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June 10th, 2009, 02:55 PM
| #2 (permalink) |
| GUE Instructor Site Admin  Join Date: Nov 2005 Location: UK
Posts: 1,930
  | If that has happened JM - surely you would end the dive. At that point you either have enough gas - or you don't. Knowing may bring comfort or it may not  Diving in a DIR team I would expect them to be all over me at that point - ready to donate if necessary so not really any need for any other solution.
__________________ Clare  . "Keep away from people who try to belittle your ambitions....Small people always do that, but the really great make you feel that you too can become great." Interested in DIR dive training? Always happy to chat/answer questions so get in touch via PM or visit www.dirdiver.co.uk |
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June 10th, 2009, 03:44 PM
| #3 (permalink) |
| Muppet Man  Join Date: Jun 2006 Location: Orpington Kent
Posts: 526
| As Claire said you'd end the dive with such a failure. With DIR you'd also be diving in a team and should know what air they have likewise they should know what air you had before the failure so there should not be an issue there. Proper dive planning would also mean that you should have calculated your minimum gas for an air sharing accent to get you out alive even with a total loss of gas. |
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June 13th, 2009, 10:30 AM
| #5 (permalink) |
| New Member  Join Date: Dec 2007 Location: Queenscliff ,Victoria,Australia
Posts: 111
| just adding to the responses, knowing your scr you should be able to have a very close istimate to what gas you have used before failure.ie started dive with 230bar 10min into dive failure happens shutdown, now you can work out how much gas would be in single tank, say 110bar less loss amount off 40bar leaves 70bar now with that amount of gas getting to first gas switch should not be a problem and if not have deco obligation then you should have no problems surfacing... Now after all that it want be a problem as you would be on your buddies long hose and all is good...
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June 13th, 2009, 02:26 PM
| #6 (permalink) |
| Sister of Darkness  Join Date: Sep 2006 Location: North West
Posts: 1,978
| Quote: (Originally Posted by martyqdc)  just adding to the responses, knowing your scr you should be able to have a very close istimate to what gas you have used before failure.ie started dive with 230bar 10min into dive failure happens shutdown, now you can work out how much gas would be in single tank, say 110bar less loss amount off 40bar leaves 70bar now with that amount of gas getting to first gas switch should not be a problem and if not have deco obligation then you should have no problems surfacing... Or I could see post 2 para 2
__________________ Fiona It is impossible to make everything foolproof because fools are so ingenious. GUE Member DIVELIFE for everything you need and more |
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June 14th, 2009, 01:59 AM
| #8 (permalink) |
| New Member  Join Date: Nov 2008 Location: Chicago / Great Lakes
Posts: 21
| Quote: (Originally Posted by Clare) If that has happened JM - surely you would end the dive. At that point you either have enough gas - or you don't. Knowing may bring comfort or it may not Diving in a DIR team I would expect them to be all over me at that point - ready to donate if necessary so not really any need for any other solution. Man, you can not get a better awsner than that. |
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June 14th, 2009, 03:07 PM
| #9 (permalink) |
| LCS  Join Date: Nov 2005 Location: Evidently Chickentown
Posts: 1,114
| Quote: (Originally Posted by Clare) If that has happened JM - surely you would end the dive. At that point you either have enough gas - or you don't. Knowing may bring comfort or it may not Just wondering why that isn't also done with deco gas? I don't use SPG's on my deco bottles and I noticed in another thread a comment that someone else didn't (was it Bill Main? Great minds  ). I've got the same philosophy, either I have enough gas or I don't, the gauge isn't helping and most of the serious leaks I've ever had have been on the HP side. Is it just a hang-over from cave-rigged cylinders?
__________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk The Lot isn't the only place to dive: http://www.lulu.com/content/613554 |
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June 14th, 2009, 09:20 PM
| #10 (permalink) |
| New Member  Join Date: Aug 2007 Location: Germany
Posts: 26
| I assume you use a SPG on deco bottles because it's an element of the proper gas switching protocol, isn't it? Cheers, Jako
__________________ www.jakoweb.de |
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