Vacuum Operation Or Suction Lift; Before Starting An Atex-Approved Pump; Maintenance/Inspection; Warning - Grundfos NK Serie Montage- Und Betriebsanleitung

B 96029550 P2 0514 0001
Model
Fig. 6 Model, product number, production site, week and
year, and serial number

Warning

Do not operate the pump at temperatures
exceeding those specified on the "key
application data sheet". Damage resulting from
disregarding this warning will not be covered by
the Grundfos warranty.
If the data sheet is missing, contact Grundfos for
information about the maximum liquid
temperature.
Note
If the pump is to be operated at a higher liquid
temperature than the one stated on the data
sheet, contact Grundfos.

9.2 Vacuum operation or suction lift

Fig. 7 Pumps with double seal arrangements connected to
an elevated vessel
If vacuum operation or suction lift is a continuous or periodic
operating condition for the applications shown in fig. 7, use
appropriate level monitoring equipment to ensure flushing liquid
in the seal chamber. The pump must be stopped if the flushing
liquid reaches a specified low level in the supply vessel.

10. Before starting an ATEX-approved pump

Note
This check list must be strictly observed.
1. Check that the ATEX rating on the order corresponds to the
category specified on the motor and pump nameplates.
2. Check that the rubber parts of the pump are as ordered.
See nameplate.
Example:
NKG 125-100-160 /160-142 H2 F 2 A KE O 2926
8
The key to the nameplate is shown in the installation and
operating instructions for the standard pump.
3. Check that the pump and/or auxiliary units have been filled
with liquid and vented.
4. Check that the shaft can rotate freely.
There must be no mechanical contact between impeller and
pump housing.
5. Check the direction of rotation. The correct direction of
rotation is shown by an arrow on the pump housing.
6. Follow the special start-up procedures for pumps with double
seal (back-to-back or tandem).
See the installation and operating instructions for the pump in
question.
7. If a pump with double seal (back-to-back) has been chosen,
check that the seal chamber is correctly pressurised.
8. Before start and during operation, make sure that the pump
does not leak or has any malfunction.
9. The pump must be re-vented in these cases:
– The pump has been stopped for a period of time.
– Air/gas has accumulated in the pump.

11. Maintenance/inspection

This check list must be strictly observed.
Note
It may be overruled by stricter local maintenance
schedules.
1. Check on a daily basis that shaft seal and auxiliary units
function correctly.
2. Check the lubricant and bearing noise each week. If the
bearings begin to show signs of wear, they must be replaced.
3. Check coupling rubber parts every four weeks. If they begin to
show signs of wear, they must be replaced.
4. Any standby pump installed must be switched on once a week
to keep it operational.
5. The pressurising or the flushing system must be thoroughly
cleaned once a year. Observe the manufacturers instructions
for the auxiliary unit. Take the pump out of operation for this
purpose.
Subject to alterations.