Pipe Connection; Priming Tank And Test Pipe - Grundfos Fire NKF Series Installation And Operating Instructions Manual

Checking the alignment
Warning
Disconnect the battery cable before you remove
the coupling guard.
Beware of the sharp edges of the coupling guard.
Wear protective gloves.
1. Disconnect the negative pole of the starter battery.
2. Remove the coupling guard.
3. Check the alignment according to the installation and
operating instructions for the coupling.
4. Refit the coupling guard.
5. Reconnect the negative pole of the starter battery.
Aligning pump and engine
Axial and radial screws can be reused maximum
three times.
Caution
Do not use threadlocker as it may damage the
rubber material.
1 4 2
Fig. 13 Axial and radial fixation of the clamping hub of the
coupling
6. Align the coupling according to the installation and operating
instructions for the coupling.
Warning
After checking or adjusting the alignment, fit the
coupling guard.
14
5 3

6.5 Pipe connection

The pipework must not stress the pump housing
or transfer any forces to the pump housing.
Caution
See permissible flange forces and torques in
section 6.3 Mounting the pump set.
The discharge pipe must have a port for venting
Note
and priming the pump. See section
8.2 Preparations before commissioning.
The pipes must be installed as straight as possible and be of an
adequate size. Take the pump inlet pressure into consideration.
Install the pipes so that air locks are avoided. This applies
especially to the suction side of the pump. See fig. 14.
Fig. 14 Installation of pipes
Secure the pipes close to the pump on the suction and discharge
side with pipe brackets attached to the building (wall, ceiling,
floor). See fig. 15.
The pipes should lie true against the pump flanges without being
stressed. Otherwise, the pump may be damaged.
Fig. 15 Fixing points of the pipes
Install isolating valves on both sides of the pump.
Connect the suction pipe to the horizontal pump port and the
discharge pipe to the vertical pump port.

6.6 Priming tank and test pipe

If the pump set is supplied from a storage tank and the suction
height is negative, install a pump priming tank on the suction side
in accordance with local regulations. See also the standard
applying to the pump set.
Install a test pipe running from the discharge pipe to the storage
tank. The discharge pipe and the test pipe must be fitted with
isolating valves.
If the pump set is fed directly from the public water supply, the
test pipe must have a free outlet according to the standard
applying to the pump set.