drive shaft
Fig. No.
11
11 of 10
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
VERTICAL TURBINE PUMP - NVT SERIES
Ref. No. NVT-IOM/2020/V.01
The the components of the Vertical Turbine fire pumps are equipped with register fits enabling the automatic alignment of
mating parts. Nevertheless we recommend that the alignment between the driver and top shaft be checked during installation
of the driver and after the discharge piping is connected. To do the same follow the procedure described below.
Mount the magnetic base of the dial indicator on the drive plate. Place the contact point of the dial on shaft and slowly turn
rotor and check the dial indicator reading variation (Fig. No.
12
).
Confirm that the shaft run out is within
0.06
”. (
1.5
mm) TIR. If it is not within this limit then it indicates a misalignment.
In such cases check the following possible causes:
1
. Bent top shaft
2
. Burrs or foreign matter between shaft ends, between driver flange and discharge head top flange, discharge head mounting
flange and foundation. (If any leveling problem is found between discharge head mounting flange and foundation it can be
corrected by shimming between them).
3
. Eccentricity of vertical driver to discharge head.
5.6. Aligning Pump and Driver
Align pilot bore boss into companion flange mating diameter. Align bolt holes of drive shaft flange and companion
flange / adapter disc. Secure drive shaft to companion flange using bolts / studs with hand tight on both ends. Extend
shaft at slip section until pilot bore boss aligns with companion flange pilot bore boss. Align holes and tighten the
bolts/studs to firmly secure the drive shaft to the companion flanges/ fly wheel adapter disc.
Do the alignment as specified in the section
5
.
7
. After the alignment lubricate all joints and slip splines. Add lubricant
to until clean lubricant appears at all four bearing seals. Disconnect the screws and separate the two halves of the
drive shaft guard. Fix the guard in place to properly cover the drive shaft and secure it with the screws.
Once the companion flanges / fly wheel disc is fixed in place, lift the drive shaft, compress it and lower it into position
between mating flanges (see Fig. No.
11
).
