J Line Pump
Horizontal Double Suction Centrifugal Pump – API 610 Process Pump
47 V1.032818
Position of discharge valve on starting
A high or medium head centrifugal pump, when primed and 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
• Coupling properly aligned
• Piping complete
• Correct rotation
• Pump shaft turns freely
• Discharge valve closed
• Suction valve (if used) open
• Seal water valve (if used) open
• Pump completely primed
• Motor and pump properly lubricated
Only after these items have been checked should the pump be started.
WARNING: Exposed coupling and shafting between pump and driver must be
protected with coupling guard and/or shaft guard prior to pump start-up and
operation.
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