Carver Pump GH - Page 22

I-120
GH Pump 120 – 16.02.EN
16
Table 3. Pumping Unit Troubleshooting - Continued
SYMPTOM
IMMEDIATE ACTION
PROBABLE CAUSE
CORRECTIVE ACTION
Pump discharge pressure
excessive.
1. Stop the pump, refer to
Section VIII, Paragraph
E.
1. Excessive speed.
1. Check speed precisely.
Decrease speed.
2. Pump is pumping fluid
with specific gravity in
excess of that
specified. (If
temperature of fluid is
lower, then specified
specific gravity will be
higher.)
1. If prescribed fluid
temperature or specific
gravity cannot be
attained, one or more
of the following
measures can be
taken:
a. Partially close
discharge valve,
reducing pump
capacity to a point
where driver is not
overloaded.
b. Install more powerful
driver. Consult
Carver Pump
Company specifying
exact operating
conditions.
Pump overloads motor.
1. Stop the pump, refer to
Section VIII, Paragraph
E.
1. Speed too high.
1. Check pumps RPM
and determine correct
sheave and belts for
proper speed. Consult
local distributor or
Carver Pump
Company.
2. Pump discharge
pressure is lower than
design point, therefore
pump's volume too high
(check pump
nameplate).
1. Partially close
discharge valve until
pressure at discharge
flange is as specified.
Decrease speed if
driver remains
overloaded.
3. Same as 2 under
“Pump Discharge
Pressure Excessive.”
1. Same as 2 under pump
discharge pressure
excessive.