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Regulators and Cylinders: Discuss Use of Drager composite cylinder in the Dive Kit and Equipment forums: Hi People, for various (very good) reasons I want to clamp a Drager composite cylinder to the side of my ...

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Old 19-05-08, 06:40 AM
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Use of Drager composite cylinder
Hi People, for various (very good) reasons I want to clamp a Drager composite cylinder to the side of my rig. These are designed for land based breathing apparatus. I'm wondering if there are any issues with using them under water. I can't foresee any problems but there again, it's worth asking the question....

ATB
Ian
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Old 19-05-08, 08:23 AM
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they are VERY bouyant - so loads of lead!
Can I ask why composite and not just steel or ali?
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Old 19-05-08, 09:22 AM
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saw a thread recently that mentioned salt water getting under the fibre wrap and hiding corrosion, but cant remember the details
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Old 19-05-08, 09:26 AM
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Originally Posted by Richie
they are VERY bouyant - so loads of lead!
Can I ask why composite and not just steel or ali?
Agreed i tried diving with an old BA cylinder these are composite as well but to get the lead was ridiculous

get a steel one

Graham
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Old 19-05-08, 09:51 AM
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I've checked the buoyancy and with regulator and hose etc it's neutral (+/- 0.5kg dependent on gas) which is exactly what I want.


I need a DS inflation supply to mount on the side of the fibreglass shell of an RB. Dry weight is 3.5kg. Any steel or Al. cylinder will be much heavier than this and would stress the fibreglass much more. With the valve at the top it will trim fine as the RB needs lead in the top anyway to balance the CL's. 1kg comes out of the top and goes onto the belt.

I'm just interested in how constant immersion in salt water may affect it.

Cheers
Ian
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Old 19-05-08, 10:10 AM
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Quote:
Originally Posted by ianfirmin
I'm just interested in how constant immersion in salt water may affect it.
it'll shag it up in no time

you might get the season out of it
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Old 19-05-08, 10:24 AM
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Quote:
Originally Posted by warmwaterdiver
it'll shag it up in no time
not designed for constant immersion in water, especially salt water as this will get underneath the outer fibre layer and corrode the thin steel inner bottle.

why not get yourself a small dedicated ali 1 - 1.5L suit inflator bottle which can be attached to the wing backplate, or even to the side of your sub?
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Old 19-05-08, 01:18 PM
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How about an extra coat of lacquer or two part epoxy?
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Old 19-05-08, 01:48 PM
gordon gordon is offline
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Quote:
Originally Posted by ianfirmin
How about an extra coat of lacquer or two part epoxy?
Gaffer tape is cheaper...
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