Starting Up The Product; Dry Running; Before Starting An Atex-Approved Pump - Grundfos NK Serie Instrucciones De Instalación Y Funcionamiento

5. Starting up the product

WARNING

Dry running

Death or serious personal injury
- Make sure that the pump is filled with
pumped liquid during operation.
5.1 Before starting an ATEX-approved
pump
Strictly observe the following check list.
1. Compare the order with the supplied pump and
motor. Check that the EPL (Equipment Protection
Level) of the pump and motor corresponds to
what is ordered. If the EPL of the motor and
pump differs from each other or the temperature
class of the motor differs from that of the pump,
the following applies:
– The EPL which defines the lower protection
level applies. Example: The EPL of the motor
is Gc and the pump's is Gb. Gc applies.
– The temperature class which defines the
higher temperature applies.
Example 1: Motor temperature class is T4 (135
°C), and pump temperature class is T3 (200
°C). T3 (200 °C) applies.
Example 2: Motor temperature class is T3 (200
°C), and pump temperature class is T4...T3.
T3 (200 °C) applies.
2. Check that the pumped liquid and its operating
temperatures are in accordance with what is
stated on the "key application data sheet".
3. Check that the shaft seal and rubber parts of the
pump are as ordered. See the nameplate.
NKG 125-100-160 /160-142 H2 F 2 A KE O 2926
Fig. 5 Example of codes for rubber parts and
shaft seal
The key to the nameplate is shown in the installation
and operating instructions for the standard pump.
4. Check that the maximum speed on the pump
nameplate corresponds to the speed of the motor
and that the pump will not be used for operation
with a frequency higher than 60 Hz.
5. Check alignment of the pump and motor. Follow
the procedure in the standard instructions.
6. For the oil-filled bearing bracket, check that oil is
filled to the correct level. Do not use another
lubricant than specified. See section
installation and operating
7. For bearing brackets with grease nipples, check
that grease can be pumped into the bearing. Do
not use another lubricant than specified. The re-
greasing nipple could be defective, or the re-
greasing channel may be blocked.
8. Check that the pump and/or auxiliary units have
been filled with liquid and vented.
9. Check that the shaft can rotate freely.
There must be no mechanical contact between
the impeller and the pump housing.
10. Check the direction of rotation. The correct
direction of rotation is shown by an arrow on the
pump housing.
11. Follow the special startup procedures for pumps
with double seal (back-to-back or tandem).
See the installation and operating instructions for
the pump in question.
12. If a pump with double seal (back-to-back) has
been chosen, check that the seal chamber is
correctly pressurised.
13. Before start and during operation, make sure that
the pump does not leak or have any
malfunctions.
14. The pump must be re-vented in these cases:
– The pump has been stopped for a period of
time.
– Air or gas has accumulated in the pump.
1.2 Related
instructions.
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