Convert Blend stick to use liquid oxygen.

[cgm73]

:-( Sorry I've done a terrible job at articulating my thought. What I mean is to use a membrane system ( Nitrox Generating Systems Overview | Nuvair) or oxygen concentrators (like medical oxygen concentrators) that remove N2 from the air instead of lox to gox.

Yeah, I hear you about the waste. A few military aircraft I worked on used lox. Boil off from the bottle and from the storage tanks always seemed unfortunate.

I think The nuvair system will have way to many consumables and parts to be practical In my opinion. Just looking at the system but Im no expert on it by no means

 

[broncobowsher]

Compressed O2 has an indefinite shelf life. 1 month old or 20 years in storage, still exactly the same.

Cryogenic gasses don't. While dewers do a good job of holding liquid gasses, they don't hold forever. If you ever had a block of dry ice and kept it in a cooler, it slowly turns into a gas and goes away. MRI machines have a cold head that takes the helium that has warmed into a (still very cold) vapor and chills it back down into a liquid. It takes continuous energy to maintain a cryogenic liquid in storage.

Not sure where across the ocean you are trying to take this, but a good chance when you get there the dewer will be warm and empty.

It also adds a whole new level of hazmat shipment complexity.

 

[cgm73]

Compressed O2 has an indefinite shelf life. 1 month old or 20 years in storage, still exactly the same.

Cryogenic gasses don't. While dewers do a good job of holding liquid gasses, they don't hold forever. If you ever had a block of dry ice and kept it in a cooler, it slowly turns into a gas and goes away. MRI machines have a cold head that takes the helium that has warmed into a (still very cold) vapor and chills it back down into a liquid. It takes continuous energy to maintain a cryogenic liquid in storage.

Not sure where across the ocean you are trying to take this, but a good chance when you get there the dewer will be warm and empty.

It also adds a whole new level of hazmat shipment complexity.

From what I can tell the burn off rate is close to 20-30 days. If you had a small tank and filled 20 tanks at one time the burn off would not be much of a factor.

 

[Akimbo]

Would you just pipe it straight to blend stick from dewers canister are would you need a heat exchanger between dewers and blend stick?

Basically yes, but check the supply pressure from the Dewar and compare it to what you supply to your blending stick now and adjust your needle valve accordingly.

Your LOX supplier can tell you if a heat exchanger is required when you tell him the maximum flow you require. It depends on the Dewar you lease. It is named after the chemist and physicist, Sir James Dewar.

 

[Couv]

It is named after the chemist and physicist, Sir James Dewar.

No relation to: https://en.wikipedia.org/wiki/John_Dewar_Sr. (Of whiskey fame.)

 

[cgm73]

Basically yes, but check the supply pressure from the Dewar and compare it to what you supply to your blending stick now and adjust your needle valve accordingly.

Your LOX supplier can tell you if a heat exchanger is required when you tell him the maximum flow you require. It depends on the Dewar you lease. It is named after the chemist and physicist, Sir James Dewar.

Thanks for the help. Good starting points.

 

[cgm73]

update LOX supplier smallest bottle is 80lbs which puts me back in the 125cuft oxygen size. Of coarse the LOX could do way more than 20 tanks at 36% percent still not what i was hoping for. I will keep looking. Thanks for all the help.

 

[broncobowsher]

You did mention shipping them across the ocean. I would inquire with the shipper about shipping cryogenic gasses and see what they say about it. They may not alloy it. In which case even if you found a smaller container it may still not be shippable.

 

[cgm73]

I think The nuvair system will have way to many consumables and parts to be practical In my opinion. Just looking at the system but Im no expert on it by no means

Update LOX to much a pain in the butt. Talked with nuvair rep. Gonna go with this system. I’ll update with a review when we get it up and running. Thanks for the help.