What is a gas booster pump?

In this video Stefan from NRC explains what is a gas booster pump and how it is used by scuba divers to move gases from one diving cylinder to another.
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**Booster pump should not be used without proper training
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[@user-th6vi5kp8j]

지금 화면에 나오는 부스터의 가격은 어떻게 되고 어디에서 구매 할수 있습니까?

[@andrefilipe9946]

Hello, I have a question, I want to buy equipment like this to empty my zeppelin (blimp) and return the helium into the cylinder! Is it possible to do this with this equipment? Or does it just transfer from one cylinder to another? thank you very much!

[@sahinsahinoglu879]

What should the booster drive pressure be? I can't understand.

[@stefanwei5507]

Hi Sahin, the drive pressure should be depends on the Model between 2 and 10 bar

[@sahinsahinoglu879]

@@stefanwei5507 Thank you for the answer.❤️

[@andrefilipe9946]

Hello, I have a question, I want to buy equipment like this to empty my zeppelin (blimp) and return the helium into the cylinder! Is it possible to do this with this equipment? Or does it just transfer from one cylinder to another? thank you very much!

[@lukadzi]

Since no one answered:
There's always a minimum inlet pressure requirement on those, usually around 5-10 bar for boosters like that.
It means that booster like that won't be able to "take air out" that's bellow 5 bar. To my understanding, in case of zeplins, the pressure is way below that mark so booster like that wouldn't work as they're designed for high pressure systems like scuba tanks.
You can potentially find one that does that but I'm not aware of one.
Additionally, if you're buying helium from a supplier, usually the tanks have 1 way valve build in to prevent you from refilling those yourself so you'd have to verify that too.
Lastly, there's running cost to consider. On top of a booster you'd need a source of compressed air of around 8-10 bar. A decent shop compressor with enough flow would work but if you account for a running cost of that compressor (electricity + maintenance) will you actually save more helium that it will cost you. Especially since depending on the size of the zeplin, you might barely have enough helium to get the system up to pressure (there's always some gas loss when transferring due to gas in lines, valves, etc.)