VLT
Vertical Process Pump
47 V1.090418
Figure 7.1. Seal setting devices.
Position of discharge valve on starting
A high or medium head centrifugal pump operated at full speed with the discharge gate valve closed
will require much less energy than when it is operated at its rated head and flow with the gate valve
open. For this reason it is usually advantageous to have the discharge gate valve closed when the
pump is being started. The pump must not be throttled by the use of a valve in the suction line.
WARNING: Operating the pump with a closed discharge valve can result in
excessive heat build-up and should be limited to the shortest practical
duration. Operating the pump close to shut-off head usually places greater
bending strains on the shaft than at operating points near the best efficiency
point.
The following list of important items should be checked before the pump is started after initial
installation or repair:
• Pump and driver bolted securely.
• All gauges, valves and instruments are in proper working conditions.
• Coupling properly aligned.
• Piping complete.
• Correct rotation.
• Pump shaft turns freely.
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