VLT
Vertical Process Pump
51 V1.090418
If the rotor is jerky or suddenly stops, there is danger that the rotor has
become blocked. The pump must be opened and all running clearances
checked.
4. Ensure the drive motor cannot be unintentionally turned on.
5. Ensure the shut-off devices in the suction and pressure pipes cannot be unintentionally
opened.
6. Drain the pump and the auxiliary piping only when the pump will receive maintenance.
If the outside temperature is below 32 °F (0 °C), all cooling chambers must be
emptied, and all seal system cooling coils must be drained.
7.6 SHORT-TERM SHUTDOWN
If the pump was switched off correctly and has not suddenly come to a halt, it may be re-started
without the need to take any special measures.
If the pump comes to a sudden halt, or if the pump was switched off because of a possible danger, it
must be checked for damage.
7.7 LONG-TERM SHUTDOWN
1. Follow the stopping procedure described in SECTION 7.5-STOPPING.
2. Disconnect the vent filter and seal openings on the bearing frame to lessen the exchange
of air.
3. While the unit is idle:
a. If the plant is in an operational state, warm up and start the unit at monthly
intervals (see SECTION 7.2-STARTUP for details).
b. If the plant is not in an operational state, turn the unit over by hand a couple of
times at monthly intervals, ensuring the shaft is not returned to the same position,
to allow the bearings to rest in a different position every time.
4. If there is danger of freezing, drain the pump, drain the oil from the pump’s bushing and
all auxiliary piping.
5. Change the oil before recommencing operation, ensuring the correct grade and volume
has been filled in the stuffing box (see SECTION SIX - LUBRICATION for details).
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