second hand Sofnolime

[ray]

From Martin on the inspiration list, now I no non of our re-breather divers would be cheapscate enought to do this, (or would they).



It has come to our attention that a dangerous practice of re-packing a partially used scrubber is being used. This practise has lead to a serious accident and could lead to a fatality if continued.

I’d like to remind you that if a partially used scrubber has insufficient life remaining to complete the intended dive, the entire sofnolime bed should be replaced with fresh material.

If there is sufficient canister life remaining, the partially used sofnolime must not be disturbed in any way as breakthrough will occur prematurely.

Until the Vision scrubber gauge is launched the life of the scrubber is purely determined on a prediction basis. If you change any parameters (material, work rate, depth, water temperature) the prediction is invalid.

Please be aware CO2 coming through the scrubber can be completely debilitating and if through in sufficient concentration in the high O2 environment of the breathing circuit – there may be no physical warnings, you will just go unconscious.



Best Regards,



Martin Parker

Managing Director

Ambient Pressure Diving Ltd & A P Valves

[Decodiver]

You know anyone doing that is a fool.

This should be forced down students throats by instructors, that you don't remix lime.

Go kill yerself for a couple of quid!! Madness.

Cheers

Dave Cooper

[beanie]

for the sake of £8 really not worth it

[Drmike]

Originally Posted by ray

From Martin on the inspiration list, now I no non of our re-breather divers would be cheapscate enought to do this, (or would they).



It has come to our attention that a dangerous practice of re-packing a partially used scrubber is being used. This practise has lead to a serious accident and could lead to a fatality if continued.

One guy on Diveoz.com.au does it all the time!

Nutter.

[dalegray]

Are there realy people quite this stupid?

If so Darwin will be getting involved, so the rest of us probably neadn't worry.

[Padowan]

There is a half cannister "adapter" for the Dolphin I believe, allowing only a half bed to be packed, is this then considered dangerous, or is it the fact of completely RE-packing used material that's the issue?

If a half cannister is OK on the Dolphin, would it be possible to remove half the Inspo cannister of used lime, and repack half a cannister of fresh stuff on top? Perhaps for pool practices or shallow lake bimbles?

At the end of the day, I'm not a cheapskate, and with a hundred kilos of the stuff in my garage, I don't skimp on a bed if I need one!!

[MATTBIN]

If a half cannister is OK on the Dolphin, would it be possible to remove half the Inspo cannister of used lime, and repack half a cannister of fresh stuff on top? Perhaps for pool practices or shallow lake bimbles?

I’d like to remind you that if a partially used scrubber has insufficient life remaining to complete the intended dive, the entire sofnolime bed should be replaced with fresh material.

If there is sufficient canister life remaining, the partially used sofnolime must not be disturbed in any way as breakthrough will occur prematurely.

Not according to the words from Mr.Parker, it clearly states do not disturb the cannister EXCEPT for a complete repack.

Caveat - OC diver, I just read the bit above in post 1 of this thread

Best wishes
Matt

[nigelH]

Originally Posted by Padowan

There is a half cannister "adapter" for the Dolphin I believe, allowing only a half bed to be packed, is this then considered dangerous, or is it the fact of completely RE-packing used material that's the issue?

It's disturbing the stack.
There has, I believe, been an incident involving emptying a part used scrubber into a sealed plastic bag to 'save' it and then reloading the scrubber with that mix. Since the scrubber is used from the bottom up this distributes used material through the mix and provides channels of used 'lime that do not scrub. Breakthrough, instead of being a predictable is now statistical and "it works for me" turned out to be Russian Roulette.

nigelH

[Conor]

Originally Posted by Padowan

If a half cannister is OK on the Dolphin, would it be possible to remove half the Inspo cannister of used lime, and repack half a cannister of fresh stuff on top? Perhaps for pool practices or shallow lake bimbles?

OC diver, but ex-chemist (i.e. atoms n stuff not pharmacist).

The catch is that the system in which the scrubber material exists is potentially dynamic and unpredictable. I would assume that although normally most of one end of the canister was used there would actually be a distribution throughout the cylinder. When a cylinder is 75% through its life, taking a sample of it does not mean that that sample is 75% through its life, it is somewhere beteen 0 and 100%. If it could be 100% used, adding this to fresh lime (say 10% old to 90% new) could not be treated the same as even a 10% used scrubber, cos the distribution would be of a different model to the normal use case. Worst case scenario, it could provide a channel through the scrubber that meant that the air was unchanged, which would in effect mean that the scrubber was inert.

Basically it sounds like russian roulette to me. It equivalent to pouring a bag a flour into your lime and hoping it extends the scrubbers life rather than shortening your own.

Conor

[Padowan]

Originally Posted by nigelH

It's disturbing the stack.
There has, I believe, been an incident involving emptying a part used scrubber into a sealed plastic bag to 'save' it and then reloading the scrubber with that mix. Since the scrubber is used from the bottom up this distributes used material through the mix and provides channels of used 'lime that do not scrub. Breakthrough, instead of being a predictable is now statistical and "it works for me" turned out to be Russian Roulette.

nigelH

OK so if conceptually any used lime that you put back into the cannister can written off as useless, then half filling the cannister with used lime and half filling it with new lime (so we have a complete properly packed layer of duff stuff and another properly packed layer of good stuff on top) is no more dangerous or risky than the idea of a half-cannister-adapter in a Dolphin. (remember we're talking for pool stuff and shallow lakes, not anything 'meaningful', like over 10m or so)