Start-Up; Pump With Dosing Pump - Grundfos NKG series Montage- Und Betriebsanleitung

7. Start-up

7.1 Pump with dosing pump

Warning
Pay attention to the orientation of the vent holes, and take care to ensure that the escaping liquid does not cause
personal injury or damage to the motor or other components.
When handling hot or hazardous liquids, special attention should be paid to the risk of personal injury.
When pumping flammable liquids, beware of static discharges. The funnel, for instance, should be earthed!
The seal chamber/cartridge seal must always be filled with barrier fluid during operation.
Dry-running will destroy the shaft seal.
Illustration Step Action
Connecting the barrier fluid supply pipe
• Connect one end to the seal chamber (pos. 1, fig. 2) or to the
cartridge seal (pos. 1, fig. 4).
• Connect the other end to the outlet of the dosing pump.
1
Recommended pressure
• Set the start pressure of the dosing pump to a pressure 1.5 to 2 bar
above the highest pressure the pump can deliver.
(P + P + P
pump inlet 1.5 - 2.0
2
Filling with barrier fluid
• Start the dosing pump.
• Fill with barrier fluid.
Seal chamber: Loosen the vent screw at the top of the seal chamber
(pos. 2, fig. 2), and fill the seal chamber with barrier fluid through the
inlet (pos. 3, fig. 2).
When the liquid starts running out of the vent hole, immediately close
3
the vent screw.
Cartridge seal: Fill the cartridge seal with barrier fluid through one of
the connections (pos. 1 or 3, fig. 4).
When the liquid starts running out of the vent hole, immediately close
the vent screw.
The dosing pump will stop automatically when the pressure set in step 2
has been reached.
Operation with positive inlet pressure
• Loosen the vent screw (pos. A, fig. 2 or fig. 4) in the cover.
• Close the isolating valve on the discharge side.
• Open the isolating valve on the inlet side.
• Slowly fill the pump with the liquid to be pumped.
When the liquid starts running out of the vent hole, immediately
close the vent screw.
4
Operation with suction lift
• Loosen the vent screw (pos. A, fig. 2 or fig. 4) in the cover.
• Close the isolating valve on the discharge side.
• Fill the pump and the inlet pipe with the liquid to be pumped using a
funnel.
• When the liquid starts running out of the vent hole, immediately close
the vent screw.
Note: A non-return valve must be fitted to the inlet pipe.
Starting up the pump
See also installation and operating instructions for NK, NKG pumps.
• Open the isolating valve on the discharge side.
• Start the pump, and check the direction of rotation.
5
See the correct direction of rotation on the motor fan cover.
• After a few minutes, vent the pump again by means of the air vent
screw (pos. A, fig. 2 or fig. 4).
< P )
dosing max.
9