How do hospitals get their oxygen supply?
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Industrial gas are extracted from air we breath, these are done at gas plants. Each type of gas like oxygen, nitrogen, carbon dioxide etc has each individual boiling point where a certain temperature and pressure level will become liquid gas state.
Once the required gas are extracted and in liquid form it then get transported off to sites and hospitals via lorries with storage tanks.
A cup of liquid gas can fill a whole room in gas form so transporting via liquid form works great. Imagine ikea foam mattress, when compressed with no air in foam you could transport much more than a mattress fill with air.
Once liquid gas arrive on site, it will be off loaded to storage pressure cylinder in liquid form. When required It will then be heated and liquid gas would expand into gas form and fill a separate storage for usage. These stored oxygen in gas form will then fill smaller storage vessels that can be carried or wheeled into hospital rooms.
Depending on the geographic locations and ambient temperature, the liquid gas could be heated using the ambient vaporisers where liquid gas runs through series of piping with fins to boil the liquid. These type of vaporiser will tend build up in ice over a period of operation and needs to be switched off to melt the ice build up.
Other type of vaporiser are using heating elements like jet engine using methane gas to boil the liquid gas in large quantities. These are costly and tend to be used for docks receiving gas supplies from abroad. I live in UK and we get methane gas from the Middle East by under water pipe and ships.
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