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  1. #1
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    TDI valve drill.

    Can I just confirm the process that is taught by TDI, please?

    1) Isolate.
    2) Close and breathe down right post.
    3) Swap to back up reg.
    4) Open right post.
    5) Close left post.
    6) Breathe down back up reg and switch back to primary.
    7) Open left post.
    8) Open isolator.

    Is that right?

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    No.

    Isolate
    Swap to backup reg
    Close down right post and verify with a purge
    Open right post and verify with a purge
    Swap to primary
    Shut down LH post and verify a purge
    Open LH and verify with a purge
    Open isolator

  3. #3
    Administrator Garf's Avatar
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    unless things have changed TDI don't have a rigid standard. I've seen a superb TDI instructor in the past (albeit 10 years ago) work with both the GUE flavour and the Isolator first flavour, explain the pros and cons of each, and teach the method that the student actually planned to use. I actually found it a very open and refreshing exercise watching him teach.
    Gareth Burrows
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    www.divedir.com

  4. #4
    Old but keen Mark Chase's Avatar
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    I think that correct there is no specific system you just have to demonstrate compitance

    I did TDI donkys years ago and the instructor went with which ever valve you could reach first, right post or isolate. My buddy found it easier to reach the right post but I found it easier to isolate, swap regs then try and sort out the right post.

    The new GUE system I did on my second fundies course seemed logical (unlike their first system I did on DIRF)

    In the real world outside training I struggled with right post so I liked to isolate first as Id only have the isolator one hand turn open so I was assured of at least half my back gas remaining.

  5. #5
    Gobbie squaddie, average diver timmyg's Avatar
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    Quote Originally Posted by Wibs View Post
    No.

    Isolate
    Swap to backup reg
    Close down right post and verify with a purge
    Open right post and verify with a purge
    Swap to primary
    Shut down LH post and verify a purge
    Open LH and verify with a purge
    Open isolator
    No. That is a way, not the way. I prefer to breath down my primary then swap so that the students get the feel of the squeeze, but allow them to do either.

    I do have a demo video in draft but not on me.


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  6. #6
    Old but keen Mark Chase's Avatar
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    I hate breathing down regs. You can end up with less than half an in breath before you switch and then if the reg your switching too fails your in deep do do

    The other issue is if you only got a fractional in breath your stressed on the switch and can go for the inhale too soon risking some breathed water and more deep do do

    This happened to me o a course which resulted in vomiting / retching and a clusterfuc

    I appreciate that its good to experience the tight reg scenario but I feel this should be done under more controlled conditions where the viabuility of the back up is confirmed first.

  7. #7
    Gobbie squaddie, average diver timmyg's Avatar
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    Valid points.

    But that is why I allow them to do either in-water post dry run.


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  8. #8
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    Ideal.
    Thanks all.

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    What I listed was what I was taught last year for manifolded twins.

    I can see that it's much less risky as there's no breathing from closed regulators.

    Other techniques are accepted by TDI, such as the GUE right to left with breathing down primaries, as are sidemount, twindies and other configurations.

    The main requirement is demonstration of competence.

    You will be tested during (some) courses that you do the correct shutdown/resolution sequences. Specifically that you isolate to preserve half (just under..) your gas unless you're 100% certain that you know which reg/hose/post is leaking. This is a benefit of an "isolate first" drill; you will naturally train to go for the isolator first, rather than trying the right post.

    I commented on the first post as it mentioned the isolator (implying manifolded twinsets), TDI, and the breathe-down of the backup reg (which will suddenly stop due to the short hose) which isn't, as far as I'm aware, ever done as a valve drill.

    Caveats: what do I know, I'm not an instructor, I'm just a current student that practices a lot with other buddies for forthcoming TDI courses.

  10. #10
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    No worries Wibs, all info much appreciated.
    It's good to know that TDI are not too strict about procedure, more about competence. I'm not slagging any other agencies its just I believe a rounded approach is always a good thing.


 
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