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Old 19th August 2010, 20:50   #1
Wol
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Inspiration - Recommendation on packing scrubber

I was on a boat yesterday and spoke to someone who had rung AP diving after seeing their youtube video on how to pack their scrubbers. The video shows the scrubber being filled and the lime being leveled without any patting of the scrubber case and then sealed.

I understand that along with me originally many people were taught to pack the lime very tightly with lots of patting of the scrubber housing.

Apparently AP have done more testing and came to the conclusion that due to the fact that gas will flow through the path of least resistance, then if the scrubber is packed tightly and gaps in the lime due to clumping etc appear, channeling is more likely to occur as the gas chooses the gaps as the path of least resistance.

If the lime is loosely packed channeling is less likely to occur as the gas has a much wider choice of easy gas flow routes.

Can anyone else confirm that this is the true case?

(He did also mention that this does not neccessarily apply to other rebreathers eg the meg as the gas flows differently due to the scrubber designs)
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Old 20th August 2010, 09:07   #2
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Re: Inspiration - Recommendation on packing scrubber

FWIW this is the official video from AP's site- Ambient Pressure Diving Ltd.
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Old 20th August 2010, 09:58   #3
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Re: Inspiration - Recommendation on packing scrubber

Good luck on driving a few km on bumpy roads to your dive-destination...
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Old 20th August 2010, 09:59   #4
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Re: Inspiration - Recommendation on packing scrubber

interesting, the video shows minimum packing only to fill to desired height, then the text in the video shows "only screw until it touches the spider plate" and not to tighten this any more.

I have always filled half way, then 'taped and spin' and then filled the other half and repeated, then when I screwed the self packing plate on I would go lightly hand tight, then do one more 'tap and spin' for another twist of the screw.

Damn, maybe I was all F-ed up and just lucky not to have a CO2 hit, or perhaps the difference between the two methods are negligible due to the self packing design. This may be like finding out how many licks it takes to get to the tootsie roll center of a tootsie pop...
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Old 20th August 2010, 10:39   #5
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Re: Inspiration - Recommendation on packing scrubber

Quote: (Originally Posted by jlovold) View Original Post
Good luck on driving a few km on bumpy roads to your dive-destination...
Based on the conversation I had with a guy who had spoken to Martin Parker - the light packing causes less issues!! - This is what their testing revealed.

I wouldn't mind getting some official communication from AP around this.
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Old 20th August 2010, 10:59   #6
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Re: Inspiration - Recommendation on packing scrubber

Quote: (Originally Posted by Wol) View Original Post
I understand that along with me originally many people were taught to pack the lime very tightly with lots of patting of the scrubber housing.

...

If the lime is loosely packed channeling is less likely to occur as the gas has a much wider choice of easy gas flow routes.

Can anyone else confirm that this is the true case?
I was also taught to "hard pack", by which I mean 1/3+tap, 1/3+tap, 1/3+tap, top+tap, spider on, tap, tighten.

I then dived with Big Mike from AP. He did this - fill to top, spider on, done.

A few years later I saw the AP video (Ambient Pressure Diving Ltd.). I switched to a "similar" method.

Now I fill it to 8/10's and level (by gentle tap) and then top to slightly over filled, spider on+tap and fit the nut so it is on several threads and the spider is flush. This is slightly more over-packed than the video shows.

In comparison the hard pack lime felt like plasticine and the new way feels very soft.

I get 8 fills from 20kg whereas before I got 7.

I've noticed no WOB differences and the lime still gives the same performance as before. Tried is down to 130m for 5hrs total-time.

Cheers
Matt.
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Old 20th August 2010, 11:09   #7
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Re: Inspiration - Recommendation on packing scrubber

Quote: (Originally Posted by Wol) View Original Post
Based on the conversation I had with a guy who had spoken to Martin Parker - the light packing causes less issues!! - This is what their testing revealed.

I wouldn't mind getting some official communication from AP around this.
Hi Wol,

I'm pretty sure that Martin posted to the Inspo list about this at the time that the video was made available. I can't find the mail though.

In any case, isn't the fact that the video is on their website sufficient official communication?

Cheers,

Phil
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Old 20th August 2010, 14:09   #8
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Re: Inspiration - Recommendation on packing scrubber

I suppose it is - but the majority of people I know still pack the scrubber the old way. Also in the video it is the evolution scrubber with vision electronics - so it does leave some element of doubt as to whether this also applies to the inspo classic. Also a description of the packing regime and the test data behind it would be good. Does AP have the equivalent of a bulletin board for key operating procedure changes or notification of changes to its users via email etc?
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Old 20th August 2010, 14:36   #9
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Re: Inspiration - Recommendation on packing scrubber

My teacher told me that Martin Parker told him:“We should teach our divers to fill and not to pack the scrubber.“ This was about one year ago.
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Old 20th August 2010, 14:43   #10
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Re: Inspiration - Recommendation on packing scrubber

Quote: (Originally Posted by Wol) View Original Post
I suppose it is - but the majority of people I know still pack the scrubber the old way. Also in the video it is the evolution scrubber with vision electronics - so it does leave some element of doubt as to whether this also applies to the inspo classic. Also a description of the packing regime and the test data behind it would be good. Does AP have the equivalent of a bulletin board for key operating procedure changes or notification of changes to its users via email etc?
Hi Wol,

Yes, I'll admit to having been less than convinced about it myself

APD do send announcements out to registered users on occasion (software upgrades, service announcements).

You might be best to mail Nicky Finn direct (nicky@apdiving.com) to ask what the status of this advice is and whether it applies to the Classic as well as the Vision.

Cheers,

Phil
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