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ii) Once the water supply sources are activated and all
personnel and equipment are safely away from the
pump system, turn on the drive motor.
Note: If pump operation becomes unstable, resulting
in increased vibration levels and decreased pumping
volume,
shut down the system immediately
determine the cause.
iii) While the pump is stabilizing at the required inlet
vacuum, inspect the flow of the liquid seal (water) to
the pump. Ensure that the liquid seal is flowing out of
the water trap silencer drain.
iv) Continuously monitor the temperature of the
pump casing during the start-up procedure. If the
temperature rises quickly or reaches 25°F (14°C) or
more above the liquid compressant temperature, shut
down the unit immediately and determine the cause.
v) After starting the pump, monitor the temperature
of the bearing bracket until the temperature stabilizes
for a minimum of 30 minutes.
CAUTION!
If the temperature of a bearing bracket is more than 30°f
(17°c) higher than the pump casing temperature, shut
down the pump immediately and identify the cause.
Caution: if there is abnormal bearing noise, vibration,
odor, or smoke, shut down the pump immediately and
determine the cause.
vi) Inspect the pump for vibration and noise. Excessive
vibration and noise indicate an abnormal condition for an
N.E.S. pump. Shut down the pump immediately to avoid
further damage and identify the cause.
vii) Verify the speed (R.P.M.) of the pump shaft rotation
by removing the nameplate cap from the fixed bearing
outer cap and using a tachometer with a shaft extension, if
required. Evaluate the measured speed with the rated speed
specified for the pump. The rated operating speed and
capacity can be found in the purchase specifications or
obtained by consulting your N.E.S. Representative.
NBE O & M Document No. NES/NBE/O&M
5.5 Start-up and Operating Checks
5.5.1 Start-up
To proceed with the commissioning process, please
follow these steps:
1. The shut-off valve in the inlet pipe should be
and
opened first.
2. If your machine is equipped with a mechanical seal
with an external sealant supply, open the shut-off
valve for the sealing liquid.
3. Switch on the drive motor to start the machine.
4. Adjust the shut-off valve for the seal water as
follows:
If you are using a method with volume flow
measurement, open the shut-off valve for the
operating Liquid wide enough for the volume flow
meter to show the required volumetric flow.
Once the final inlet pressure is reached, adjust the
volumetric flow of the operating liquid to the correct
value.
Monitoring the volume flow using a flow meter and
adjusting the operating liquid flow rate accordingly
helps maintain the proper functioning and
performance of the machine during commissioning.
If you encounter any difficulties or require further
assistance during the commissioning process, it is
advisable to contact the NES support or service
department for guidance.
Method for pressure measurement during start-up:
Perform this step when the pressures on the inlet
connection and discharge connection are equal in the
start-up state.
1. Adjust the shut-off valve for the liquid compressant
so that the pressure gauge indicates approximately
14.5 psia (0 psi gauge pressure) in the start-up state.
2. As the final inlet pressure is reached during
Operation, the pressure gauge may indicate a different
value, ranging from approximately -2.9 to +1.45 psi
Page 15 of 43
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