Flowserve APKD - Manual (Page 33)

APKD DOUBLE-CASE, DOUBLE-SUCTION USER INSTRUCTIONS 26999903 07-13
Page 33 of 55 flowserve.com
until the pumpage is clean. Stopping the pump
when handling large amounts of abrasives (as is
sometimes present on initial starting) may lock the
pump and cause more damage than the pump is
allowed to continue operation.
Every effort should be made to keep abrasives out
of lines, sump, etc. so that abrasives will not enter
the pump.
5.7.5
Frequency of lubrication
The characteristics of the installation and severity
of service will determine the frequency of
lubrication. Lubricant and pump/motor bearing
temperature analysis is useful in optimizing
lubricant change intervals.
The motor bearing temperature limitations should be
considered for its lubrication requirements. Refer to
the driver manufacturer’s user instructions supplied
with the pump. If documents are not found contact
Flowserve.
Never mix greases containing
different bases, thickeners or additives.
5.7.6
Normal vibration levels, alarm and trip
Pumps generally fall under classification of rigid
support machines within the International Rotating
Machinery standard and maximum vibration levels
are based on those standards
Alarm and trip values for installed
pumps should be based on the actual
measurements (N) taken on the pump in a fully
commissioned (new) condition. Measuring
vibration at regular intervals and recording will help
to track any deterioration in pump or operating
conditions.
5.7.6.1 Typical
allowable field vibration values
for vertical turbines- sump or wet pit
types
Motor rating kW (hp) Vibration
velocity-
unfiltered Vibration
mm/sec (in./sec) rms
0.75-to 7.5 (1-10) N 6.1 (0.24)
7.5 to 75 (10 -100) N 6.1 (0.24)
75 to 750 (100 -1000) N 6.1 (0.24)-7.1 (0.28)
N = Normal; Alarm = N X1.25; TRIP = N X 2.0.
5.7.6.2 Typical
allowable field vibration values
for vertical turbines with suction barrel
Vibration Vibration
Motor rating kW (hp) velocity-
unfiltered mm/sec (in./sec)
rms
0.75-to 7.5 (1-10) N 5.1 (0.20)
7.5 to 75 (10-100) N 5.1 (0.20)
75 to 750 (100-1000) N 5.1 (0.20)-6.1(0.24)
750 to 2238 (1000-3000) N 6.1 (0.24)-7.1(0.28)
N = Normal; Alarm = N X 1.25; TRIP = N X 2.0.
5.7.7
Motor start/stop frequency
Even though motors are normally suitable for at
least two consecutive starts, it is recommended to
restart only after coasting to rest between starts
(minimum of 15 minutes gap), with the motor
initially at ambient temperature. If more frequent
starting is necessary, refer to driver manufacturer’s
instructions or contact Flowserve with details.
The number of motor start and
stops in any given time affects motor life.

If the motor is expected to experience multi
starts in any given time, please refer to the driver’s
user instructions before the pump is put into
operation.
5.8 Operating the pump
5.8.1
Venting the pump
Make sure that the pump is vented to
enable all trapped air to escape, taking due care
with the hazardous or hot liquids. Under normal
conditions after the pump is fully vented and
primed, it should be unnecessary to re-vent the
pump.
Figure 5.4
DISCHARGE VENT LINE
SUCTION VENT LINE
SEALING LIQUID
SUCTION
SOURCE