ABSTRACT
Subscripts 1 and 2 in Equation 9.1 represents two points, one upstream and the other downstream of the pump, respectively. The quantity
h
is the headloss along the pipe between points 1 and 2. If 1 is taken in the pipe immediately upstream of the pump while 2 is taken immediately downstream of the pump,
h
is zero and Equation 9.1 reduces to
h
=
h
–
h
,
where
h
and
h
are then referred to as the
suction head
and the
discharge
head
of the pump, respectively. Thus, the pump head is simply the discharge head minus the suction head, namely, the difference between the two heads. It is the energy imparted by the pump to the flow in the pipe for unit weight of the fluid flowing through the pipe. The power output of the pump is
(9.3)
where
Q
is the discharge (
Q
=
VA
).
