Xylem MPV - Manual (Page 84)

Installation, Operating and Maintenance Instruction
Model MPB, MPV
MPB 100-english page 80 Revision 02
Article No 771074115 Issue 01/2010
In areas endangered to explosion IEC 60079-14
must additionally be noticed for the electric
installation.
The direction of rotation must only be checked
when the pump is full. Dry running will cause
damage to the pump.
5.6 Final Control
Check alignment of coupling acc. to chapter 5.3.1
again. It must be possible to turn the unit easily by
hand at the coupling.
6. Start-up, Operation, Shut down
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
instructions given here).
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 guarantied at the
suction side of the pump in any case.
The water treatment must be in acc. 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.
6.1 Initial start-up
Before starting up the pump, check, if the following
points were controlled and carried out:
With pumps of designs MPB and MPV, no
additional lubrication measures are required
before the first startup.
Pump and suction pipe must be filled completely
with liquid when starting up. Open the screwed
plug "PM2" for filling. Close them when water is
flowing out.
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 quantity and
pressure.
Open valve in suction /intake pipe.
Set the pressure-side slider to approx. 25% of the
pump rate for which the system was designed. For
pumps with a drive output lower than 30 kW, the
slider may also remain closed briefly upon startup.
Secure, that unit is electrically connected acc. to
all regulations and with all safety devices.
Check direction of rotation by switching on and off
briefly. It must be the same as the directional
arrow on the bearing frame.
6.2 Switch on drive
Immediately (max. 10 seconds on 50 Hz resp.
max. 7 seconds on 60 Hz currency feed) after
reaching normal operating speed open discharge
valve adjust the required operating point. The
pumping data shown at the type plate resp. in the
data sheet and / or the order confirmation must be
met. Every change is only permitted after talking
with the manufacturer!
Operation with closed valve in the suction and /
or discharge piping is not permitted.
On starting-up without back-pressure, the back-
pressure must be produced through throttling at
the discharge side. After reaching full back-
pressure open valve
In order that the shaft sealing can be monitored
and maintained unhindered, no protection cover
is provided in this area. Therefore special
attention is required when pump is working (no
long hair, loose clothes, a.s.o.).
Packing:
Packing need leakage for trouble free function
(drop wise outlet of pumped medium). Adjust
ample leakage in the beginning. Reduce that
slowly during the first operating hours by
continuously fastening of gland (see position "69"
and "M3" in sectional drawing) when pump is
running. Assume 60-100 drops / minute as
approx. value.
The leakage must flow out liquid in any case (not
vaporous).
Packing that run dry will harden and then
destroy the shaft sleeve and/or the shaft.
Mechanical seals:
Mech. seals don't need to be maintained and are
almost free of leakage.
If pump does not reach attended head or if
atypical sounds or vibrations do occur:
Switch off pump (see chapter 6.7) and seek for
causes (see chapter 10).
6.3 Restarting
Basically, the same procedure should be followed as
for starting up for the first time. However, there is no
need to check the direction of rotation and the
accessibility of the pump unit.
The pump should only be automatically restarted if it
has been made sure that the pump has remained
filled whilst stand by.