Question Mixing sorb

[slimshady]

So I had some 408 sorb left over and thought I could just add it to my 812. The 408 is a round larger pellet and the 812 is a smaller cylendrical pellet. The 408 does not last as longer, but has better WOB. Has anyone mixed different sorb and what were their results if any?

Thanks

 

[davehicks]

I have used both 408 and 812 over the years. I don't see any issue with mixing, but perhaps don't push the runtime as far as you might with 812. Spend a bit more time packing and settling the canister.

 

[broncobowsher]

The only potential issue I see is channeling. If the fine grain is packed more to one side and the coarse on the other side. Airflow will favor the coarse side (easier to breath).

Axial flow scrubber you could do layers of each without much of an issue. Radial flow could get real sketchy if filled in layers.

 

[davehicks]

The only potential issue I see is channeling. If the fine grain is packed more to one side and the coarse on the other side. Airflow will favor the coarse side (easier to breath).

Axial flow scrubber you could do layers of each without much of an issue. Radial flow could get real sketchy if filled in layers.

Do you think it would channel more than pure 408?

 

[Mobulai]

Do you think it would channel more than pure 408?

That’s the only situation that makes sense to me as well where channeling will occur; not necessarily more gaps than pure 408 (not familiar with it tho), but obvious pneumatic resistance differences that will eventually cause tge same result as channeling (gas flow over spent sorb)

If the fine grain is packed more to one side and the coarse on the other side.

Otherwise mixing different grain “evenly” will result in tighter packing than the “bigger” grain alone

E2A: the only problem I can see arising is how to ensure consistency of even packing: reflecting on a household chore, mix packing musli with porridge into a clear container every 2 weeks or tho, and even tho I try to alternate between the two while packing some serious channeling happens, but then I have to shake and spin into different directions to get things evened out — which leads to a lot of breakaway dust (not good for sorb); and if you pre-mix in a tub and then pour they don’t fall out consistently as well
TLDR; the process would be not feasible and tedious for a lot and maybe even dangerous; for a one-off it should be alright with some care and foresight
(This is all statistical, look at a Montecarlo simulation for visual reference)

E2A2: tighter sorb -> higher wob & longer stack time and vv, can’t really comment on wob of mixed sorb tho

 

[slimshady]

Thanks. Good point about channeling. Radial scrubber so if I were to mix types of sorb I would probably premix before packing the scrubber. Anyone had success with mixing 408 and 812?

 

[broncobowsher]

Do you think it would channel more than pure 408?

Yes.
I have axial on my mind, so I will go that route. You can turn 90° and figure radial.
One side 408, open spaces, flows good.
Other side 812, tighter grain structure. You ask air to pass through these 2 options, what is it going to do? Take the path of least resistance. The 812 might as well be a solid block. The 408 is the channel.

 

[davehicks]

Yes.
I have axial on my mind, so I will go that route. You can turn 90° and figure radial.
One side 408, open spaces, flows good.
Other side 812, tighter grain structure. You ask air to pass through these 2 options, what is it going to do? Take the path of least resistance. The 812 might as well be a solid block. The 408 is the channel.

I would think the idea is to mix the two sorbs together fairly evenly in a jug before pouring it into a scrubber. I agree it would be bad to just dump in one type and then another.

 

[Mobulai]

How much 408 do you actually have remaining? If you have more than half a tub might be better to just finish off your 408 first then for the last run mix it up; even if you achieve an even mix you’ll have to do some mental gymnastics for the stack times

And any chance you actually use a dual scrubber setup (like a revo or sidewinder)?
If you do, maybe use split fills and have some peace of mind on the mixing

 

[slimshady]

Xccr and it's not enough for a full scrubber. Probably should just toss it. Really wondered if anyone routinely mixed types. Either on purpose or accidentally.