VLT
Vertical Process Pump
46 V1.090418
7. OPERATION
7.1 PRIMING
• A centrifugal pump must always be completely filled with the liquid to be pumped each
time before starting.
• Do not attempt to run the pump dry or serious and costly damage may result, as wear
parts within the pump depend on the pumped fluid for lubrication.
• Priming is accomplished following these steps:
1. Open the suction valve.
2. If the liquid flows into the pump with enough head, a valve on the discharge must be
opened temporarily to allow the liquid to flow through the pump and entrapped air or
vapors are expelled.
3. Open the vent located on the suction can or the nozzle head to allow the entrapped air
or vapors to be expelled.
7.2 STARTUP
Every time before the pump is started up the safety devices must be mounted
and fastened.
In order to avoid risks of injury or damage, all pump units must be equipped
with emergency-stop devices.
For operation of electrical drives, control systems and their cable routes, the
safety instructions issued by their manufacturers must be observed.
When the pump is shipped with a cartridge mechanical seal type installed, the
setting devices on the seal collar might be engaged. In this case, it is necessary
to tighten the set screws, disengage these setting devices from the seal, and
turn them to allow the operation of the pump. To perform this procedure,
please follow the instruction manual from the seal manufacturer.
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