1.568 atm gauge pressure in the water pipes is necessary if a fire hose is to spray water to a height of 16 m
Gauge pressure = ρgh
= 1000 × 9.8 × 16
= 156800 Pa
= 1.568 atm
The pressure measured in relation to the surrounding atmospheric pressure is known as gauge pressure. A diaphragm sensor can be used to detect gauge pressure, with one side of the diaphragm exposed to the pressure medium that has to be measured and the other exposed to the surrounding atmospheric pressure.
It should be noted that while measuring gauge pressure, unless the measuring site is exposed to ambient air pressure, the measured gauge pressure will alter with fluctuations in barometric pressure caused by changes in weather patterns.
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