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Bursting CO2 SMB's? Bursting CO2 SMB's?
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Other Dive Equipment: Discuss Bursting CO2 SMB's? in the Dive Kit and Equipment forums: So after the last thread, I've been a puchased a red (back-up) and a yellow (emergency) Aquatec CO2 SMBs I've ...

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Old 04-01-07, 12:19 PM
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Bursting CO2 SMB's?
So after the last thread, I've been a puchased a red (back-up) and a yellow (emergency) Aquatec CO2 SMBs

I've stencilled my name on (the same as on previous SMB's) and read the instructions on use & care

This got me thinking, as theres no over inflation valve, what stops the SMB from bursting if its too full???
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Old 04-01-07, 12:23 PM
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I guess it has a max depth of deployment based on volume of gas in CO2 cylinder. Sent one up from about 36m & it didn't burst...

Does depth matter? Can't be bothered to figure it out. There is a fixed amount of CO2.

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Old 04-01-07, 12:24 PM
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I guess the size of the CO2 cartriges have been matched to the volume of the DSMB.
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Old 04-01-07, 12:26 PM
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I guess the size of the CO[sub]2[/sub] cartriges have been matched to the volume of the DSMB.
ten out ten
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Old 04-01-07, 12:26 PM
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but that CO2 will expand a different amount depending upon depth of deployment

send it up from 100m, if it doesn't burst then sending it up from 10m would suggest it'll be very limp?
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Old 04-01-07, 12:29 PM
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Quote:
Originally Posted by warmwaterdiver
but that CO2 will expand a different amount depending upon depth of deployment

send it up from 100m, if it doesn't burst then sending it up from 10m would suggest it'll be very limp?
No, it is a constant mass of CO2 in the little cannister. It is at high pressure i the cannister, and will just fill the SMB at atmospheric. At any point in between it will fill the blob proportionally less, but still expand to fill it entierly on the surface, which is always at atmosphere.
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Old 04-01-07, 12:29 PM
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Quote:
Originally Posted by warmwaterdiver
but that CO2 will expand a different amount depending upon depth of deployment

send it up from 100m, if it doesn't burst then sending it up from 10m would suggest it'll be very limp?
Incorrect. There is a limited amount of CO2 in the cartrige and that will not change even at depth.
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Old 04-01-07, 12:29 PM
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full at the top , not so full at depth
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Old 04-01-07, 12:30 PM
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Quote:
Originally Posted by warmwaterdiver
send it up from 100m, if it doesn't burst then sending it up from 10m would suggest it'll be very limp?
Won't it by limp at 100m & fully erect at 10m???? Bag is a fixed/sealed volume.
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Old 04-01-07, 12:35 PM
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slight deviation here folks - Gary where did you get your yellow one, its on my 'to purchase list' and assume you looked around so thought I'd save myself the work
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