School of Professional Eng Question of the Week June 26
School of Professional Eng Question of the Week June 26
(OP)
Hello everyone. I am taking my PE in the Fall and found a great website that give you a new problem every week.
However, this weeks problem I believe may have an error, but I'm not Water/Distribution engineer so I thought I would ask you all....
Here is the website with the solution.
http://www.schoolofpe.com/answeroftheweek.asp
My question: in the answer arent they only solving for the motor cost of $44/week, not the pump and motor cost as the problem statement dictates? Why isnt the pump cost added to that? Because if the pump produces 2.5hp, then the cost per week is $25. GIving you a total of $69/week, not $44...right?? am i missing something?
Thanks for the help everyone!
However, this weeks problem I believe may have an error, but I'm not Water/Distribution engineer so I thought I would ask you all....
Here is the website with the solution.
http://www.schoolofpe.com/answeroftheweek.asp
My question: in the answer arent they only solving for the motor cost of $44/week, not the pump and motor cost as the problem statement dictates? Why isnt the pump cost added to that? Because if the pump produces 2.5hp, then the cost per week is $25. GIving you a total of $69/week, not $44...right?? am i missing something?
Thanks for the help everyone!





RE: School of Professional Eng Question of the Week June 26
RE: School of Professional Eng Question of the Week June 26
RE: School of Professional Eng Question of the Week June 26
Total Efficieny = Hydraulic Horsepower
--------------------
Motor horsepower
Motor horsepower includes the hp of the pump? I thought the hydraulic hp was the horsepower of the pump, and the motor horsepower was separate.
In short, you're saying the Motor Horsepower includes the 2.5 pump hp? Is that correct?
RE: School of Professional Eng Question of the Week June 26
The overall system efficincy is what you put into the system divided by what you get out of the system.
The motor drives the pump so obviously the motor horsespower includes the pump horsepower as you put it. only the motor is burning electrical power and that is what you pay for.
RE: School of Professional Eng Question of the Week June 26
RE: School of Professional Eng Question of the Week June 26
RE: School of Professional Eng Question of the Week June 26
Note that other costs such operators, controls, maintenance, capital costs, etc., are excluded.
RE: School of Professional Eng Question of the Week June 26