[Rasull (OP)]

Hi guys, According to your knowledge and experience share some of the uses of helium gas in industries. Thanks in advance hope I will get some interesting answers.

[evan_au]

- Balloons (party & industrial)
- Cryogenic refrigeration - really benefits from Helium-3, which is much rarer than the common Helium-4
- In air tanks for deep-diving (Nitrogen dissolves in your blood, and fizzes when you come up = bad news!)
- Pressurizing tanks on spacecraft
- Big Bangs (about 10% of the bang)
- Radioactive decay (alpha particles)

See: https://en.wikipedia.org/wiki/Helium#Applications

[alancalverd]

Leak detection in vacuum systems

More on cryogenics: we use liquid helium for low temperature superconducting magnets (4K) and circulating helium gas for high-temperature superconductors (70K) in MRI systems.

Hot helium airships are fun. You use waste heat from the engines to heat the gas until the ship floats, but it hugs the ground when it is cold, so making docking and maintenance a lot easier. Not sure if there are any flying nowadays but they appear from time to time as research projects. 

[chris]

Leak detection in vacuum systems

More on cryogenics: we use liquid helium for low temperature superconducting magnets (4K) and circulating helium gas for high-temperature superconductors (70K) in MRI systems.

Hot helium airships are fun. You use waste heat from the engines to heat the gas until the ship floats, but it hugs the ground when it is cold, so making docking and maintenance a lot easier. Not sure if there are any flying nowadays but they appear from time to time as research projects. 

How is the heat transferred into the helium?

And what about when they want to descend again?

[alancalverd]

You can wrap pipes around the engine exhausts and pump the helium through them to warm it. As the gas temperature will always be above ambient, there is no problem cooling it. Airship journeys are never short - the whole business of takeoff and landing makes them uncompetitive with helicopters and aeroplanes - but if you intend to travel over 1000 miles at 100 mph and 10,000 ft, you have plenty of time to plan your descent, and plenty of cold air to cool the gas. 

The forgotten hero of air cargo operations is the loadmaster!

[syhprum]

Are their any high-temperature superconductor MRI machines in use and do they still use Helium for cooling presumably with much less loss Helium than 4K machines

[alancalverd]

Yes, indeed. I've just sold two clinics using HTS "upright" MRI systems with recirculating helium chillers.