fluid column (pressure)
Explanation:
I know Kate already gave this answer, but just the same:
My educated guess would be that this does not mean there is a physical column of liquid inside a cilinder, the text just refers to the fact that the pressure in the tank corresponds to 7 metres of fluid column (in the case of water: app. 0.7 bar); the use of these 'units' could be related to the fact that the maximum *rise height* of certain pumps is app. the same for fluids of different specific gravity, thus eliminating the need for conversions
| Harry Borsje
Netherlands
Local time: 10:36
Specializes in field
Native speaker of:  Dutch
PRO pts in category: 16
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The translation workplace 
peer agreement (net): +2
