Oxygen.
Nice person from boc or airliquid brings a large lorry of liquid oxygen. Then places a load of cooling pipes from truck to VIE (Vacume insulated evaporator) then pumps liquid o2 into tanks.
You should have a large master VIE and then a smaller secondary one next to it or somewhere else on site. If you have multiple buildings not near to each other there might be multiple VIEs.
Small buildings might just have a double bank manifold of J size cylinders.
O2 is evaporated and pressure regulated in supply lines to hospital. Each line will be of a certain size to give a flow rate that should be enough to the supplied area.
E.g. pipe to ICU area should be big enough to deliver 60lpm to each outlet on the line. But for wards they probably calculated on 30lpm per outlet 15lpm x2 regulators and probably only for half of them to be in use at once.
If you look for shut off valves to ICU you'll see multiple o2 lines where as an elderly medical ward probably only has one or 2 shut off valves as they have less pipes coming in.
If you look for the gas alarm panels there will be one for each supply line. I dont know how much each line can deliver but for example one hospital had 2 shut off valves and panels for 8 ICU beds.
Flow meters should be read properly: https://twitter.com/LeechCaroline/status/1335170446979895298
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