Nova-Tech LMI Series G - SD Metering Pump - Manual (Page 17)

SECTION 3
OPERATION
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3.1 START-UP PROCEDURES AND CHECKS
Check that the pump is secured to its support.
If oil was previously removed for any reason, make sure
pump drive has the correct volume (1 quart) of oil (Mobil
SHC 629).
Make sure all isolation valves installed on the suction
and discharge lines are open. If the discharge line is
equipped with an injection nozzle or a back-pressure
valve, open the priming valve for discharge (if there is no
priming valve, disconnect the discharge pipe). This al-
lows for verification that liquid is present in the liquid
end when the pump is installed in flooded suction con-
dition. If the pump is installed in a suction lift condition,
this allows for priming of the pump during start-up.
Make sure that pump is set at 0% capacity.
3.2 CHECKING THE ELECTRICAL CONNECTION OF
THE MOTOR
Start up the pump to check the motor's direction of rota-
tion. It must comply with that indicated by the arrow
marked on the motor fan cover (clockwise as viewed
from the top of the motor). If the rotation is incorrect,
refer to Section 2.8 Electrical Connections.
3.3 START-UP
FAILURE TO CHECK TORQUE ON NON-ME-
TALLIC HEAD BOLTS PRIOR TO STARTUP
AND AFTER ONE WEEK OF OPERATION MAY
EXPOSE OPERATING PERSONNEL TO HAZ-
ARDOUS LIQUIDS.
Check the torque on all non-metallic head bolts prior to
startup. Recheck torque on all non-metallic head bolts
after pump has been operating for one week. Torque the
head assembly screws in a crosswise pattern as fol-
lows:
a) Liquid End Size D2 and D4 to 45 inch pounds.
b) Liquid End Size D7 and D8 to 90 inch pounds
Once all the checks and procedures described above
have been carried out, start the pump.
Conduct a visual and audio check of the pump (in par-
ticular, listen for the presence of any “suspicious” noises).
Make sure that the stroke adjustment knob is unlocked.
Gradually increase the capacity until liquid can be seen
flowing from the priming valve. If no priming valve is in
place, when the liquid end is primed, the discharge
check valves can be heard to be operating (should hear
a clicking noise caused by movement of check valve
balls). When liquid end is primed, stop the pump and
close the priming valve.
Adjust the pump to the desired capacity. Lock the stroke
adjustment knob (Item 8 in Figure 1).
3.4 CAPACITY CALIBRATION
After the first 12 hours of operation, the pump may be
tested and calibrated to find the exact pump capacity
under specific operating conditions. Usually, calibrat-
ing the pump at only 100, 50, and 10 percent capacity
settings is enough to indicate pump performance through-
out the adjustment range.
The pump can be calibrated by measuring the decrease
in liquid level pumped from a calibrated vessel. This
method is recommended for hazardous liquids because
it eliminates operator contact with the liquid. Calibra-
tion columns are available for convenient and accurate
calibration of the pump. Contact your dealer for more
information.
THIS METHOD IS GENERALLY NOT RECOM-
MENDED AS IT MAY EXPOSE OPERATING
PERSONNEL TO HAZARDOUS LIQUIDS.
FURTHERMORE, IF NO BACK PRESSURE IS
PRESENT ON THE DISCHARGE SIDE, THE
PUMP MAY OVERPUMP DRAMATICALLY IN
WHICH CASE THE POSITION OF THE CA-
PACITY ADJUSTMENT KNOB MAY HAVE
LITTLE EFFECT ON ACTUAL FLOW RATE.
FOR SAFETY REASONS, A CHECK VALVE
IS RECOMMENDED FOR USE IN THE DIS-
CHARGE LINE NEAR THE POINT WHERE
THE LINE ENTERS A HIGH-PRESSURE PRO-
CESS VESSEL.
The pump can also be calibrated by collecting and mea-
suring pumped liquid at the pump discharge port. It
may be necessary to create backpressure at the col-
lection point to allow for proper pump operation (see
Section 2.7 Back Pressure Valves for recommenda-
tions).
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