In Chapter 18 Question 7 of the CERM sample questions they solve for the total dynamic head without taking into account the atmospheric pressure.
For instance in question 1 it is solved by converting the pressure at inlet and outlet(gage pressures) to absolute pressures (Example ; Poutlet= 14.7psi + 20psi = 34.7psi(roughly))
In question 7 they do not do this. They just use to pressure gage and do not convert it to absolute pressure.
I understand everything else. I am just hung up on when and when not to convert the gage pressure to absolute pressure.
Thanks in Advance.
For instance in question 1 it is solved by converting the pressure at inlet and outlet(gage pressures) to absolute pressures (Example ; Poutlet= 14.7psi + 20psi = 34.7psi(roughly))
In question 7 they do not do this. They just use to pressure gage and do not convert it to absolute pressure.
I understand everything else. I am just hung up on when and when not to convert the gage pressure to absolute pressure.
Thanks in Advance.