I-120
GH Pump 120 – 16.02.EN
13
VIII. OPERATION.
A. PRE-START CAUTIONS.
DANGER
Before activating the pumping unit, check to
make sure there are no personnel working on
the unit. Serious injury or death to personnel
could result if the unit is activated while being
worked on.
1. Before starting or operating the pump, read this
entire manual, especially the following
instructions.
2. Observe all caution, warning or danger tags
attached to the equipment.
3. Rotate both the pump and driver shafts by hand
to assure all moving parts are free.
4. Before starting the pump, install closed guards
around all exposed rotating parts.
5. Check to make sure that fluid in the pump is
free of debris.
WARNING
Never run the pump dry. Close running fits
within the pump are liquid lubricated. Dry
running will result in pump seizure or damage.
6. Before starting a mechanical seal pump
equipped with external flush lines, turn on
mechanical seal water, and confirm the
mechanical seal water is at sufficient pressure.
Running without fluid in the stuffing box may
result in packing/mechanical seal failure.
7. If excessive vibration or noise occurs during
operation, shut the pump down and rotate shaft
by hand. If excessive vibration or noise
continues, consult a Carver representative.
B. PRIMING. Dry running a centrifugal pump can
result in extensive damage and possible seizing. It is,
therefore, imperative that the pump be primed prior to
initial start-up and that prime must be maintained
through subsequent start-stop cycles.
The priming procedure is different for positive and
negative suction head systems. Follow the procedure
listed below.
Positive Suction Head:
1. Open the vent on the highest point on the pump
volute.
2. Open all suction valves.
3. Allow liquid to flow from vent hole until all air
bubbles are vented. Then close the vent.
4. The pump is now primed.
Negative Suction Head:
1. Install an ejector or vacuum pump on the vent at
the highest point on the volute.
2. Close the discharge valve.
3. Open the suction valve.
4. Start the ejector or vacuum pump.
5. Allow liquid to flow until a continuous flow is
exhausted from ejector. Then close the valve to
the vent.
6. The pump is now primed.
C. STARTING THE PUMP.
CAUTION
DO NOT operate pumping unit against a closed
discharge system. If pump has any chance of
seeing operation against a closed system, a
bypass system allowing a minimum design flow
should be installed. This bypass will be
satisfactory for short periods of operation. For
extended periods of operation the bypass
should be sized for the minimum continuous
flow required by the pump.
1. Confirm pumping unit is ready to start.
Complete Section VIII, Paragraphs A and B.
2. If unit is equipped with mechanical seal cooling
lines, confirm that the mechanical seal cooling
water is turned on.
3. Open discharge valves slightly, about 1 to 1 ½
turns if pump is being started for the first time or
from being turned off for overhaul.
4. Open valves to pressure gauges in the system.
5. Start electrical power supply to driver. Start the
pump.
6. Slowly open system valves in discharge line and
adjust pressure and flow to the appropriate
operating conditions. Refer to pump nameplate
and system operating procedures for design
point condition.
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