Flowserve Byron Jackson Type M - Manual (Page 47)

® Byron Jackson Double Mechanical Seal Submersible Pumping Unit • 1042.293/9 • June 04
Page 47 of 68
CAUTION In the event the pumping unit does
not attain the full speed, stop the
pumping unit and do not attempt to
restart it until the trouble is found
and corrected.
During normal operation, the current must not ex-
ceed the motor data plate value.
•
Measure the line voltage between phases
while the pumping unit is pumping.
The readings obtained should not be more
than 10 % above or below the rated motor
voltage.
•
In case of malfunction, stop the pumping unit
and refer to Chapter 7 "Faults, causes and
remedies", Page 56.
5.3.2 Normal start-up of the pump
CAUTION If maintenance has been performed,
follow Chapter 5.3.1 "First-time start-
up of the pump", Page 46.
1. Verify that the control panel door is closed.
2. Verify that balanced three-phase voltage is
supplied by taking readings with the line volt-
meter and using the voltmeter selector switch.
CAUTION Never attempt to run the pumping
unit with an unbalanced voltage be-
tween two leads.
3. Start the pumping unit.
The contractor completes the pump circuit,
and the pump motor starts.
4. Verify that the pump motor comes up to speed
within 3 seconds as indicated by normal read-
ings of current, voltage, head and flow.
If
•
current exceeds the rated value of the
amperage shown in Chapter 12.2 "Data
sheet", or
•
voltage varies + 10 % or - 10 % from the
rated value shown in Chapter 12.2 "Data
sheet", or
•
head and flow are abnormal
then stop the pumping unit and refer to Chap-
ter 7 "Faults, causes and remedies", Page 56.
5.4 Running or operation
5.4.1 Performance and operating limits
Usually, a pumping unit has been selected and
built to perform a maximum efficiency under de-
fined conditions, see Chapter 3.3 "Performance
and operating limits", Page 15.
Changes of these conditions, e. g. increase or de-
crease in head, will not cause an noticeable differ-
ence in the efficiency.
However, a large variation in head will not only
show up as efficiency loss, but as a output, or
thrust bearing overload.
Water level
•
A well should always be provided with a
means for determining the static water level,
and pumping level. A good air line, with depth
gage, is generally the most simple and practi-
cal.
•
For monitoring the water level in the well, we
recommend water level detectors or water
level measuring units.
Sand
•
When a pumping unit is first started, a new
well may produce considerable amounts of
sand, despite the fact it had been sand
pumped after drilling.
The discharge should be throttled back to
where this is cut down to a minimum, then
gradually opened up to full discharge as the
sand disappears.
This operation may last from a matter of min-
utes to several days or longer.
If the sand flow shows no signs of stopping
•
rework the well to screen out the sand, or
•
install a pumping unit with a capacity
smaller than that of the currently installed
unit.
Continued sand pumping will result in in-
creased pump wear which in turn will show up
as increased efficiency loss. Too great a wear
will run the pump beyond the repair stage and
possibly have serious effects on the motor.