Maintenance; Operation; Periods Of Inactivity And Frost Protection; Service - Grundfos NKG series Montage- Und Betriebsanleitung

8. Maintenance

See installation and operating instructions for NK, NKG pumps.
Dosing pump
See the installation and operating instructions for the dosing
pump.
Pressure intensifier
The pressure intensifier is maintenance-free.

9. Operation

A very small quantity of the barrier liquid (less than 1.5 ml per
operating hour) will flow into the pumped liquid.
The flow will increase with:
• increasing start/stop frequency
• discharge pressure fluctuations
• poor shaft seal assembly
• worn shaft seal faces.
Dosing pump
The pressure of the barrier fluid must always be at least 1.5 bar
or 10 % higher than the pressure of the pumped liquid. This is
automatically checked by the pressure switch/transmitter fitted
together with the dosing pump.
Pressure intensifier
To ensure optimum function and performance, check that the
barrier fluid pressure (read pressure gauge pos. 8 in fig. 8) is
always at least 1.5 bar or 10 % higher than the pressure of the
pumped liquid (read pressure gauge pos. 9 in fig. 8). As the
barrier fluid is consumed over time, the pressure intensifier has to
be refilled.

9.1 Periods of inactivity and frost protection

Warning
Pay attention to the directions of the vent holes,
and take care to ensure that the escaping liquid
does not cause injury to persons or damage to
the motor or other components.
When handling hot or hazardous liquids, special
attention should be paid to the risk of injury
caused by scalding hot liquid or hazardous
liquid.
Local safety regulations must be observed.
Pump
For general guidelines, see installation and operating instructions
for NK, NKG pumps.
Seal chamber
Unscrew the two connections (pos. 2 and 3, fig. 2).
The lower barrier fluid connection functions as drain.
Cartridge seal
1. Unscrew the connections (pos. 1 and 3, fig. 4).
2. Empty the cartridge seal. This can be done in two ways:
• Blow out remaining liquid by means of an air gun or a similar
device. The pressure must not exceed the pressure rating of
the cartridge seal.
• Flush the cartridge seal by means of a glycol-water solution, if
applicable for the application. The pressure must not exceed
the pressure rating of the cartridge seal.
Dosing pump
For frost protection, see installation and operating instructions for
the dosing pump.

10. Service

When ordering spare parts, always state the pump nameplate
data to ensure that the correct parts are delivered.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.

10.1 Service kits and service instructions

See www.grundfos.com (WebCAPS), WinCAPS or Service Kit
Catalogue.

11. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Subject to alterations.
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