Xylem IM157 Model MPVN - Manual (Page 7)

7
4.5 Starting Up
The plant may only be started up by people who
are familiar with the local safety regulations and
with these Operating Instructions (especially
with the safety regulations and safety instruction
given here).
In order to be able to observe and monitor the shaft sealing,
no protective covering is provided in this area. If the pump
is running, particular care should therefore be taken (watch
out for long hair, loose pieces of clothing etc.).
Hints for the Use as Boiler Feed Pump
Limits for cast iron when used in boiler feed or condensate
applications: pH-value 9,0 (optimum 9,3), short term:
pH-value 8,5.
The above stated values must be guaranteed at the suction
side of the pump in any case.
The water treatment must be in accordance with the
specifications for water treatment of boiler feed water in
steam plants up to 64 bar.
Air traps in the system must be avoided in any case.
Starting up for the First Time
• With MPV type pumps, no further lubrication is needed
before initial start-up.
• Pump and suction pipe must be completely exhausted
from air and filled with handling liquid before each
start up of the pump unit. When filling the pump open
screwed plug “PM2”. Close it when water is flowing out.
• Open slide valve in suction/intake pipe.
• Turn pump unit once again by hand and check that it
moves smoothly and evenly.
• Check that coupling guard is installed and that all safety
devices are operational.
• Switch on any sealing, flushing or cooling devices that are
provided. See Data Sheet for hydraulic requirements.
• Set discharge side slide valve to approx. 25% of rated
flow quantity. With pumps with a discharge branch rated
width less than 200 GPM, the slide valve can remain
closed when starting up (see also Point 1.4 “Minimum
Quantities”.
• Check direction of rotation by switching on and off
briefly. It must be the same as the directional arrow on
the bearing frame.
• Start drive device.
• As soon as it reaches normal operating speed, open
discharge valve immediately and adjust the required
operating point (see Data Sheet).
• Mechanical seals don’t need to be maintained and are
almost free of leakage.
Putting into Operation Again
(after longer standstill; 1 month)
Each time you put the pump into operation again you
have to do the same things you do when starting the pump
for the first time. The control of the rotation direction
of the unit can be dropped. You are only allowed to put
the pump into operation again automatically when the
pump remained filled with liquid during standstill and the
required test drives have been made, see point 4.7.
4.6 Operation and Monitoring
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.
ATTENTION: REGULAR MONITORING AND
MAINTENANCE WILL EXTEND THE
LIFE OF YOUR PUMP OR PUMP
SYSTEM.
• You must observe the area of application given on the
Data Sheet.
• Do not exceed the output given on the motor rating
plate.
• Avoid dry running, running against closed discharge
valves or operation while the liquid handled is in the
vapor phase.
• Avoid sudden changes in temperature (temperature
shocks).
• The pump and motor should run evenly and without
vibrations; check at least once a week.
• Check the regulating and monitoring facilities of any
sealing, flushing or cooling systems once a week to
ensure that they function properly. Outgoing cooling
water should be body temperature.
• 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.
Permitted Number of Starts
Do not exceed the pump’s permitted number of starts
– see diagram. With electric motors, the permitted number
of starts is given in the motor operating instructions. If two
different figures are given, the lower figure is valid.
4.7 Shutting Down
• Close slide valve in discharge pipe. This is not necessary
if there is a spring-loaded non-return valve.
• Switch off motor (make sure it runs down quietly.
• Close slide 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
system and pipes completely.
• If the pump also remains under operating conditions
(pressure and temperature) when stationary: leave all
sealing, flushing and cooling systems switched on.
• If the pump remains under operating conditions when
stationary, test drives have to be made in regular intervals
with a duration of at least 5 minutes. The intervals