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Failure points. - Again! I feel such a failure.

  • Don't dive manifolded twins.

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  • Not manifolded - is it because of failure worries?

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  • Have manifold & it failed small time in the dive.

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  • Have manifold & it failed big time on the surface.

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  • Have manifold & it failed small time on the surface.

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Finless: You couldn't invent him...
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OK, it is the subject of failure points again.

I have had one problem with my manifold in the last 100 dives and it was leaking tiny little bubbles throughout the dive. A flatulent bee would have released more gas!

I am mainly worried about a "catastrophic failure" - I just don't believe they happen on manifolds in normal use (which excludes smashing it into wrecks etc). If I am wrong I will eat my dinner!

Details to back up your problems please.
 

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Finless, you worry too much mate. Never had a problem with my manifold yet in over a year of diving my twinset
 

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I have a manifold on my twin 7s and have only had one small problem on the surface when the manifold loosened off slightly (due to someone using the manifold as a carrying handle!) which allowed one of the o-rings to become slightly unseated and let air escape.  
Not a difficult thing to fix, but time consuming as I had to strip the set down to correct and then build back up again.
 

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Finless: You couldn't invent him...
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[b said:
Quote[/b] (Steve W @ Oct. 21 2003,11:56)]Finless, you worry too much mate. Never had a problem with my manifold yet in over a year of diving my twinset
Steve,

It's not me. It's the rest of them.

I just think this concern/exclusion of things because of potential failure points can be taken too far (DIR?).

I just want to show, as best as is possible from the relatively small cross section of divers being polled, that manifolds at worst will only cause a tiny loss of gas.

Rgds
Bryan
 

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Re Sams post, that's one of the added benefits of the vavle guard, stops inexperienced folk grabbing the twinset by it's manifold, it's instinctive but unless they've been told they won't know it's wrong.

Tend to agree that some folk think that everything is going to fail just because there is a slight or perceived potential for it to happen, makes you wonder why some folk ever get into the water
 

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If I made a cover for a manifold that had sharp metal studs pointing out of it that made it impossible to us as a handle.. would anyone buy it?
 

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Finless: You couldn't invent him...
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[b said:
Quote[/b] (Dominic @ Oct. 21 2003,12:57)]If I made a cover for a manifold that had sharp metal studs pointing out of it that made it impossible to us as a handle.. would anyone buy it?
S&M dive kit - it might well catch on.  
 

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<font color='#FF0000'>personally i agree that the odds of manifolds failing in normal conditions are rare, my reason for not diving manifolds is financial (being a student), so i dive a buddy commando with twinning bands, and use the 30 (not all at once...)or so cylinders i have access to mid-week, but, in 4 years when i graduate ill get twin 12-300 bar, and a trimix ticket!
 

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Finless: You couldn't invent him...
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[b said:
Quote[/b] (cthomas @ Oct. 21 2003,21:59)]............ but, in 4 years when i graduate ill get twin 12-300 bar, and a trimix ticket!
Better start the weight training to make sure you can pick the 2*12/300s up. I would never be your buddy - not with my back.  
 

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[b said:
Quote[/b] (DougParker @ Oct. 21 2003,21:24)]
[b said:
Quote[/b] (Finless @ Oct. 21 2003,13:03)]
S&M dive kit - it might well catch on.  
You'd need to wear a rubber suit rather than neoprene though.
Ex RN Avon drysuits, totally Gimp-ish,  
a buddy of mine used one for years
 

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So did I.. until I got fed up with it being the wrong size..
 

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<font color='#000080'>I've never had a problem with my ScubaPro (232bar twin barrel o-ring style) manifold.

I have seen two of these manifolds bent to buggery from the tanks being dropped and they still don't fail. Very robust! Shame the knobs are so bloody stiff with full tanks though


Mark.
 

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The reason I didn't go for a Scubapro manifold on my new trwinset was because the chrome started to peel off the part that fits inside the cylinders with my original SB manifold...

I was shocked when I asked a local dive shop to give my cylinders a clean and he rang me to say that as far as he was concerned he couldn't allow the cylinders to be classed as O2 clean anymore because of flaking chrome on the manifold... WTF!! I was well angry as I figured some shop monkey there had chewed things up and ruined my luverly manifold and so drove down there after work only to find to my dismay that he was correct... a super fine film of chrome was coming away from the bottom of the valves where they would sit inside of the cylinders.... They hadn't been touched or damaged it was just peeling off.. Gutted was an understatement, a tank clean was a now about to cost me about £130.

On a side note Mark, I had the same problem with the knobs being really stiff on my SB and Andy Hayhurst stripped them down and greased them for me and they were then silky smooth even when fully charged, so they can be made to be easier to isolate with a bit of tinkering.

HTH
Dave
 

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Never had a problem diving either of my manifolded twins rigs; that's not to say it will never happen! I guess there's a lot to be said for frequent skills rehearsals of shut-down drills for those 'just in case' moments.

Dive safe y'all.
 

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[b said:
Quote[/b] (Mark @ Oct. 23 2003,17:44)]Shame the knobs are so bloody stiff with full tanks though
You can improve matters by taking them apart, cleaning and greasing them and cutting  slot on the threaded part that holds the seal. this makes them easier to turn under pressure but they will never be as good as an MDE which are also far more solidly built.
I had a Scubapro manifold bought when there was a scarcity of MDE for a while a few years ago and sold it after a year or so at a loss to buy another MDE, that is what I thought of it

 Completely pish
 

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[b said:
Quote[/b] ]On a side note Mark, I had the same problem with the knobs being really stiff on my SB and Andy Hayhurst stripped them down and greased them for me and they were then silky smooth even when fully charged, so they can be made to be easier to isolate with a bit of tinkering.
Same happened with my SOS manifold when I had Runneymede Dive clean them - I find it worrying that the manufacturers can't put their own manifolds together properly lubed..
 

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Resident 'Jawling Man' and 'Graunching Specialist'
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[b said:
Quote[/b] (Finless @ Oct. 22 2003,10:48)]
[b said:
Quote[/b] (cthomas @ Oct. 21 2003,21:59)]............ but, in 4 years when i graduate ill get twin 12-300 bar, and a trimix ticket!
Better start the weight training to make sure you can pick the 2*12/300s up. I would never be your buddy - not with my back.  
just for interest- which is heavier, the 12l 300 bar cylinder or a 15l 232 bar?
 

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[b said:
Quote[/b] (cthomas @ Oct. 21 2003,21:59)]personally i agree that the odds of manifolds failing in normal conditions are rare, my reason for not diving manifolds is financial (being a student), so i dive a buddy commando with twinning bands, and use the 30 (not all at once...)or so cylinders i have access to mid-week, but, in 4 years when i graduate ill get twin 12-300 bar, and a trimix ticket!
What? you're gonna win the lottery the same week you graduate
  Hmm... dunno what you're studying but have you looked  at the job prospects and estimated income for new graduates , not very encouraging. And then there's the PITA of paying back all your student loans (ouch!).

In fact, you wanna know how bad it is ?  One of my post-doc colleagues (ie someone with a PhD and therefore supposedly quite employable
  ) is now pulling pints in a pub in town as she's been unable to find a new contract in molecular research.  

God! I wish I'd been a plumber instead of a scientist  
 

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[b said:
Quote[/b] (Steve W @ Oct. 29 2003,10:43)]God! I wish I'd been a plumber instead of a scientist  
<font color='#000F22'>There's still time Steve - you're only 57  
 
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