My Twin cylinder problem ??

[casbe' rettun]

hello everyboday

would you please be able to help with my problems with my twinset.

I purchased a brand new twins 12ltrs from Go-Dive bargain

i have them and are very happy with the service.

after i built them up i and had then filed at my local diving shop i have encounterd a problems.

let me explain.

i put my DV onto the cylinders, my Dv works fine.
but i i simulate a free flow and turn off the manifold as the tec-diving manual says then turn off the DV, when i open the manifold i cannot get air from my DV..

i thought the manifolds stop free flowing.

so i disassemble them again and looked at the manifold. it seems ok, i have blown air through it.

what i'm thinking is.... could there be a problem with it ?, but i thought i would ask here first before i take the item back to the shop.

thankyou everybody

casbe'

[Chris Bone]

Once the manifold is closed you have to switch to the reg on the other valve ie your backup/secondary second stage. this enables you to breath from the cylinder who's valve/1st stage isn't free flowing, once the valve attatched to the free flowing reg has been closed then the manifold can be opened enabling you to breath from both cylinder throught your backup/secondary second stage.

hope this helped

[Garf]

"put my DV onto the cylinders, my Dv works fine.
but i i simulate a free flow and turn off the manifold as the tec-diving manual says then turn off the DV, when i open the manifold i cannot get air from my DV.. "

obviously you have to open the post connected to the DV again before you will be able to breathe through it.

"I purchased a brand new twins 12ltrs from Go-Dive bargain "

Aha, I think I may have located the problem

Seriously I'd ask someone who is familiar with twinsets to look at them before you start panicking about faults. Also think about some twinset training before you jump in the water with them.

[nigelH]

Perhaps we have a misunderstanding.

The Manifold joins the two cylinders so, if it is open you have a 24 liter capacity. The manifold is below (on the tank side) of the pillar valves.

The pillar valves from this 24L space connecting the two DVs. if a DV fails you just shut its valve and continue breath on the other one. You are still breathing the whole 24L lump.

If you hear bubbling and you don't know what it is you shut the manifold. The system is now two 12L cylinders, each with a separate regulator. Now try and shut the pillar valves and try and stop the bubbling. Whatever happens you have half the remaining gas on one reg to go home on. If it turns out that a first stage or a hose has broken and shutting a pillar valve stopped the gas loss leave the pillar shut and open the manifold and you can breath all the remaining gas. If it was the pillar itself broken you won't stop the bubbling but you still have gas to breath and if you are diving thirds and you were quick on the manifold you will get out on your own gas.

Manifold pic

[casbe' rettun]

kolo ta'mam !!!

I very much thankyou for the quick responses....

the information is very good, so when i have the free flowing DV i firstly turn off the manifold and take my other DV and turn the tank valve off..

thankyou very kindly..

just i'm missunderstanding what is "thirds" i have 12ltrs should i have goton thirds ?? as you say "get out on my own gas" the man at go-dive said that these ones will do me for diving to 90meters. ??

people in my club are using 2 tanks all the time and they advised me to get some.

i also have found that i cannot fit them onto my stab, i need bigger fasterning straps.. i will have to speak with people to help me at the club

thankyou kindly

casbe'

[desertrat]

Something smells fishy to me!!

Get some training on twins before you use them, if this is a serious post.

90m on twin twelves! You'd better have an sac of 0.5l/m to deco out on just those.

[casbe' rettun]

Please

i will not intend to go anyway near 90m, i was just sharing the information.

please my routing for my training it to use nitrox, i understand a little about it

as i can stay longer at the depth but too stay there i need to take with me more air...nitrox, that is what my club memeber tell me and i agree with them.

i do intend to seek training for better knowledge.

my apology for possibly misleading information....

but what is thirds ?

thankyou again....sorry

casbe'

[dry suit diver]

Originally Posted by desertrat

Something smells fishy to me!!

Get some training on twins before you use them, if this is a serious post.

90m on twin twelves! You'd better have an sac of 0.5l/m to deco out on just those.

yep ,bsace nutter might be trolling , i might be wrong though


thirds = 1/3 gas there 1/3 gas back 1/3 reserve gas ? or do i need training.

[And]

Ahem



Perhaps we should have a little chat

[Darren A]

Originally Posted by And

Ahem



Perhaps we should have a little chat

Why are they wearing Marigolds????

PS "casbe' rettun" anagrams to some far more unpleasent phrases than "bsac nutter"!!