Fig. No.
09
lower impeller
adjusting nut
raise impeller
drive coupling / clutch
rotation
shim
liquid level gauge
shim
800 mm (max.)
Fig. No.
10
8
of
46
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/
2016
/V.
02
small impeller clearance.
Line-up one of the holes in the adjusting nut with the nearest hole in the driver coupling (Fig. No.
09
). Insert the cap
screw in the hole and tighten it.
bottom of the keyway. Care should be taken to ensure that the gib key is not too
high so as to hold up the adjusting nut from seating on the drive coupling. Install
adjusting nut to a hand tight.
Shaft adjustment up or down is accomplished by turning the adjusting nut. Before
any adjustment is made, the impellers will be resting on the lateral bowl wear
rings, and considerable resistance due to friction can be felt when turning the
shaft by hand.
To set impellers to the mid position proceed as follows: Turn the adjusting nut
in counter clockwise direction, thus lifting the shaft, until the impellers just clear
their seats and the shaft/motor/gear drive turns freely by hand. This position
at which the shaft begins to rotate is the starting position of the adjustement.
1
/
36
to
1
/
48
turns per unit length (m) of pump shaft should be made for pump
models NF-
4
VTP
22
& NF-
4
VTP
60
and
1
/
36
to
1
/
54
turns per unit length (m) of
pump shaft, should be made for pump models NF-
6
VTP
115
, NF-
8
VTP
170
, NF-
8
VTP
230
, NF-
10
VTP
285
& NF-
10
VTP
340
further after the starting position of
adjustement. Further adjustements may be necessary after starting the pump if a
high power consumption by the pump is observed with caused diagnosed as too
5.4. Mounting Horizontal Driver (Engine or Horizontal Motor)
