Xylem MPV - Manual (Page 85)

Installation, Operating and Maintenance Instruction
Model MPB, MPV
MPB 100-english page 81 Revision 02
Article No 771074115 Issue 01/2010
Be particularly careful not to touch hot machine
parts and when working in the unprotected shaft
seal area. Remember that automatically
controlled systems may switch themselves on
suddenly at any time. Suitable warning signs
should be affixed.
6.4 Limits of Operation
The operating limits of the pump / unit regarding
pressure, temperature, performance and speed
are shown in the data sheet and / or order
confirmation and must be observed under any
circumstances!
Do not exceed the output given on the motor
name plate.
Avoid sudden changes in temperature
(temperature shocks).
The pump and motor should run evenly and
without vibrations; check at least once a week.
6.4.1 Flow min. / max.
If no other data are given in the curves or data sheets,
the following is valid:
Q
min
= 0,1 x Q
BEP
for for short time operation
Q
min
= 0,3 x Q
BEP
for continuous operation
Q
max
= 1,2 x Q
BEP
for continuous operation *)
Q
BEP
= Flow in efficiency optimum
*) on condition that NPSH
facility
> (NPSH
pump
+ 0,5 m)
6.4.2 Abrasive Media
On pumping liquids with abrasive components
an increased wear at hydraulic and shaft sealing
must be expected. The intervals of inspection
should be reduced compared to the usual
times.
6.4.3 Permitted number of starts
With electric motors, the permitted number of starts is
given in the attached motor operating instructions.
If no values for the switching frequency are given in
the motor operating manual, the values according to
Diagram 7 apply.
3
1,0
10,0
100,0
1 10 100 1000
Motor power [kW]
m
ax
. p
er
m
. s
ta
rt
s/
h
Diagram 7
If two different figures are given, the lower figure is
valid.
6.5 Lubrication of Bearings
Grease Lubrication – MPV Design Only
For quality of grease refer to chapter 7.4.
For quantity of grease refer to chapter 7.4.
The bearings are already filled with lithium based
grease at the factory and are thus ready for use.
The grease provided is suitable for a temperature
range from -30° to +90°C (measured at surface of
bearing bracket).
Re-lubrication via the two grease nipples (G).
Bearing temperature (measured at bearing
bracket) should lie max. 50°C over ambient
temperature and must not exceed 90°C, control
weekly at least. On grease lubrication the bearing
temperature can temporarily be higher by 5-10°C
after regreasing, till a possible surplus of grease in
the bearings is cut.
6.6 Monitoring
In areas endangered to explosion it is
recommended to monitor the temperature of the
bearings and the vibrations of the bearing
bracket.
Regular monitoring and maintenance will extend
the life of your pump or pump system
.
Check pump for leaks at least once a week.
On packing, check quantity of leakage at least
once a week (see chapter 6.2 section "Packing").
Check the regulating and monitoring devices of
any sealing, flushing or cooling systems once a
week to ensure that they function properly.
Outgoing cooling water should be hand warm.
With double mechanical seals, monitor pressure
and flow rate in mechanical seal area; check at
least once a week.
Pumps which are exposed to corrosive chemicals
or to wear through abrasion must be inspected
periodically for corrosion or wear and tear. The
first inspection should be carried out after six
months. All further inspection intervals should be
determined on the basis of the state of the pump.
6.7 Shutting down
Close the valve in discharge pipe right before
(max. 10 seconds) switching off the motor. This is
not necessary if there is a spring-loaded check
valve.
Switch off motor (make sure it runs down quietly).
Close the valve on suction side.
Close auxiliary systems. Do not shut down cooling
system until pump has cooled down.
If there is any risk of freezing, empty pump,
cooling areas and pipes completely.