Answer to Question #262517 in Mechanical Engineering for Angel

Question

A manometer is used to measure the gas pressure supply to a boiler. One side is connected to the supply and the other is open to the atmosphere . The manometer contains water (density 1000 kg/m^ 3 ). Calculate the gauge pressure if the head is 560 mm. How would you find the absolute pressure of the gas supply?

Answer 1

Solution;

Given;

$h=560mm=0.56m$

$\rho_w=1000kgm^2$

Take

$g=9.81m/s^2$

The gauge pressure is ;

$P_g=h\rho_wg$

$P_g=0.56×1000×9.81$

$P_g=5493.6Pa=5.4936kPa$

The absolute pressure of the gas supply is the sum of the gauge pressure and the atmospheric pressure;

$P_{abs}=P_g+P_{atm}$

$P_{abs}=5.4936kPa+101.325kPa$

$P_{abs}=106.8186kPa$