Singles into twins - do I need help?!

**neilh** · February 10th, 2006, 11:01 PM

I have a grand plan that involves turning my two single 12s into a set of twins. I've spoken to a few folks about it and have now got the manifold and bands, so I'm good to go...

...trouble is I think I'm bottling it! It sounded easy enough, but reading a few bits about the process I'm doubting whether I should try it first on my own!

So, some advice please - is it really as straight forward as I first thought (and can I do it with basic tools: spanner and hammer

) or should I see if there is a kindly soul in the Yorkshire region with some spare time next week

Rick · February 11th, 2006, 01:45 AM

Bring a 13m socket/ratchet and a 13mm spanner on Sunday and stop yer feckin whingin!:D

JS1scuba · February 11th, 2006, 04:09 AM

Quote: (Originally Posted by neilh)

I have a grand plan that involves turning my two single 12s into a set of twins. I've spoken to a few folks about it and have now got the manifold and bands, so I'm good to go...

...trouble is I think I'm bottling it! It sounded easy enough, but reading a few bits about the process I'm doubting whether I should try it first on my own!

So, some advice please - is it really as straight forward as I first thought (and can I do it with basic tools: spanner and hammer

) or should I see if there is a kindly soul in the Yorkshire region with some spare time next week

Here ya go ---- http://www.nitroxdiver.com/Doubles.htm

these instructions will work on twinning most any set.

Cheers

keylimepie · February 11th, 2006, 08:53 AM

Neil,

There is another guide on YD from Woz here http://www.yorkshire-divers.co.uk/fo...set#post145548 It is post number 66 in the thread.

And another here http://www.cisatlantic.com/trimix/doubles/doubles.htm

Let me know how you get on as I will be doing the same in a few weeks from now.

Dave

**jb2cool** · February 11th, 2006, 11:22 AM

the hardest part od building up a twinset is getting the old valves off first.

Andy C · February 11th, 2006, 02:19 PM

Quote: (Originally Posted by Rick)

Bring a 13m socket/ratchet and a 13mm spanner on Sunday and stop yer feckin whingin!:D

You forget the sledge hammer & big adjustable spanner for getting the old valves out :D

*Clare Gledhill* · February 11th, 2006, 05:20 PM

You have checked that the two cylinders are matched, haven't you (weight wise).

Sure you will have thought of this - but for anyone else considering twinning up it's worth a thought

diver-repairs · February 11th, 2006, 06:26 PM

Quote: (Originally Posted by Gledders)

You have checked that the two cylinders are matched, haven't you (weight wise).

Sure you will have thought of this - but for anyone else considering twinning up it's worth a thought

Are they the same:-
weight,height, diameter, and most important the same thread in the neck, and does it match your manifold thread:- hopefully M25 x 2mm pitch; older cylinders could well be G3/4" and American ones could be their version of a 3/4" parallel gas thread which while the same pitch as ours is different on dia, which with one of the combinations of valve/bottle gives you something that CAN be assembled but will blow apart under pressure :-(

.

When you have ALL your bits and are passing to Capernwray why don't you drop in for a chat and a build-up of your twins: phone first, I work from home but SWMBO might have me occupied doing her priority work....

Brian C ( look me up on the map) the only Technician in the village.

**neilh** · February 11th, 2006, 08:10 PM

Quote: (Originally Posted by diver-repairs)

Are they the same:-
weight,height, diameter, and most important the same thread in the neck, and does it match your manifold thread:- hopefully M25 x 2mm pitch;

Good points Clare and Brian, thanks! They should be the same - they're both new (<12 month old) Fabers!

Thanks for the tips and guides folks!

diver-repairs · February 12th, 2006, 10:15 AM

I've just thought of another Q that might have been missed: Have you got the two bottle/pillar valve O-rings AND in the right quality of rubber ie O2 compatable?

I made a tool a while back that clamps the pillar valve and when tightened up will not slip off: one quick whack on the tool with a copper hammer (sounds painful or what) and hey presto two bottles without pillar valves.

Are you currently O2 clean and was the manifold bought O2 clean and suitably wrapped to maintain that clean state?

Give me a pm if you want help; so I can ensure I'm in:- working hours upto midnight and weekends are only by negociation.

Cheers

Brian C

February 10th, 2006, 11:01 PM	#1 (permalink)
neilh (Online) Haemoglobin on the bus... Join Date: Nov 2005 Location: Barnsley, UK Posts: 1,900	Singles into twins - do I need help?! I have a grand plan that involves turning my two single 12s into a set of twins. I've spoken to a few folks about it and have now got the manifold and bands, so I'm good to go... ...trouble is I think I'm bottling it! It sounded easy enough, but reading a few bits about the process I'm doubting whether I should try it first on my own! So, some advice please - is it really as straight forward as I first thought (and can I do it with basic tools: spanner and hammer ) or should I see if there is a kindly soul in the Yorkshire region with some spare time next week

February 11th, 2006, 01:45 AM	#2 (permalink)
Rick(Offline) Jock Exley Join Date: Nov 2005 Location: Falkirk/Stratford UK Posts: 730	Bring a 13m socket/ratchet and a 13mm spanner on Sunday and stop yer feckin whingin!:D __________________ Forget Everything And Remember http://phreaticzone.thedeepstop.com/ http://www.dublinbaydiving.com/

February 11th, 2006, 04:09 AM	#3 (permalink)
JS1scuba(Offline) New Member Join Date: Nov 2005 Location: Arizona, USA Posts: 82	Quote: (Originally Posted by neilh) I have a grand plan that involves turning my two single 12s into a set of twins. I've spoken to a few folks about it and have now got the manifold and bands, so I'm good to go... ...trouble is I think I'm bottling it! It sounded easy enough, but reading a few bits about the process I'm doubting whether I should try it first on my own! So, some advice please - is it really as straight forward as I first thought (and can I do it with basic tools: spanner and hammer ) or should I see if there is a kindly soul in the Yorkshire region with some spare time next week Here ya go ---- http://www.nitroxdiver.com/Doubles.htm these instructions will work on twinning most any set. Cheers __________________ Joel Silverstein, VP, COO www.techdivinglimited.com a division of Scuba Training and Technology Inc. NAUTILUS DIVE PLANNER CYLINDER SPEC CHART

February 11th, 2006, 08:53 AM	#4 (permalink)
keylimepie(Offline) New Member Join Date: Dec 2005 Location: Sunderland Posts: 123	Neil, There is another guide on YD from Woz here http://www.yorkshire-divers.co.uk/fo...set#post145548 It is post number 66 in the thread. And another here http://www.cisatlantic.com/trimix/doubles/doubles.htm Let me know how you get on as I will be doing the same in a few weeks from now. Dave Last edited by keylimepie; February 11th, 2006 at 09:00 AM.

February 11th, 2006, 11:22 AM	#5 (permalink)
jb2cool (Online) Padawan learner Join Date: Nov 2005 Location: Bracknell, Berkshire Posts: 796	the hardest part od building up a twinset is getting the old valves off first. __________________ http://jb2cool.bulldoghome.com

February 11th, 2006, 02:19 PM	#6 (permalink)
Andy C(Offline) New Member Join Date: Nov 2005 Location: Harby, Leicestershire, working in Leeds Posts: 142	Quote: (Originally Posted by Rick) Bring a 13m socket/ratchet and a 13mm spanner on Sunday and stop yer feckin whingin!:D You forget the sledge hammer & big adjustable spanner for getting the old valves out :D

February 11th, 2006, 05:20 PM	#7 (permalink)
Clare Gledhill(Offline) GUE Instructor Site Admin Pacman Champion! Join Date: Nov 2005 Location: UK Posts: 1,540	You have checked that the two cylinders are matched, haven't you (weight wise). Sure you will have thought of this - but for anyone else considering twinning up it's worth a thought __________________ 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

February 11th, 2006, 06:26 PM	#8 (permalink)
diver-repairs(Offline) New Member Join Date: Dec 2005 Location: North Yorkshire Posts: 34	Matched cylinders Quote: (Originally Posted by Gledders) You have checked that the two cylinders are matched, haven't you (weight wise). Sure you will have thought of this - but for anyone else considering twinning up it's worth a thought Are they the same:- weight,height, diameter, and most important the same thread in the neck, and does it match your manifold thread:- hopefully M25 x 2mm pitch; older cylinders could well be G3/4" and American ones could be their version of a 3/4" parallel gas thread which while the same pitch as ours is different on dia, which with one of the combinations of valve/bottle gives you something that CAN be assembled but will blow apart under pressure :-( . When you have ALL your bits and are passing to Capernwray why don't you drop in for a chat and a build-up of your twins: phone first, I work from home but SWMBO might have me occupied doing her priority work.... Brian C ( look me up on the map) the only Technician in the village.

February 11th, 2006, 08:10 PM	#9 (permalink)
neilh (Online) Haemoglobin on the bus... Join Date: Nov 2005 Location: Barnsley, UK Posts: 1,900	Quote: (Originally Posted by diver-repairs) Are they the same:- weight,height, diameter, and most important the same thread in the neck, and does it match your manifold thread:- hopefully M25 x 2mm pitch; Good points Clare and Brian, thanks! They should be the same - they're both new (<12 month old) Fabers! Thanks for the tips and guides folks!

February 12th, 2006, 10:15 AM	#10 (permalink)
diver-repairs(Offline) New Member Join Date: Dec 2005 Location: North Yorkshire Posts: 34	I've just thought of another Q that might have been missed: Have you got the two bottle/pillar valve O-rings AND in the right quality of rubber ie O2 compatable? I made a tool a while back that clamps the pillar valve and when tightened up will not slip off: one quick whack on the tool with a copper hammer (sounds painful or what) and hey presto two bottles without pillar valves. Are you currently O2 clean and was the manifold bought O2 clean and suitably wrapped to maintain that clean state? Give me a pm if you want help; so I can ensure I'm in:- working hours upto midnight and weekends are only by negociation. Cheers Brian C