31
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
»
Detach all auxiliary supply lines.
»
Disconnect power supply from motor and engine by disconnecting the electrical connections.
»
Make sure that the motor or diesel engine will not start accidently.
»
Remove drive shaft guard in case of horizontal prime movers by removing its screws.
»
Remove the drive shaft by removing its fasteners.
»
Remove hollow shaft motor or right angle gear drive by uncoupling it from the top shaft and removing the
bolts between driver bottom and the discharge head top end.
»
Lift off the driver (hollow shaft motor or right angle gear drive) by lifting lugs or eyebolts furnished.
»
Unscrew the top shaft and the coupling between top shaft and middle line shaft.
stuffing box
packing
extractor
gland packing
stuffing box
gland packing
stuffing box
gland packing
knife
stuffing box
gland packing
split gland
gland nut
c. Cut the rings from the spi-
ral wrap at a
45
° angle.
d. Typical stuffing box as-
sembly.
a. Remove old packing with
extractors.
b. Wrap packing around the
shaft before cutting.
Fig. No.
28
9.
Cut the coil on the marked point to form a gland packing ring. It should be cut diagonally at an angle of
45
degree.
10.
Check the first ring to ensure a correct fit in the stuffing box before cutting further.
11.
Cut the balance required rings using the first ring as a template.
12.
Grease the packing rings for easy installation.
13.
Twist the packing rings sideways to get it around the shaft easily.
14.
Fit the first ring into the stuffing box. When the entire ring is fitted in using the fingers, tamp it down using
split wood bushing and push the ring down firmly until it seals on the shaft and the bore of the stuffing box.
15.
Turn the shaft to ensure it is not binding; fit the second ring with the joint
120
degree apart to ensure that there
is no direct leak path. Turn the shaft again.
16.
Fit the lantern ring. This should be slightly above its final position to allow for the slight compression of the
packing when secured. Fit the remaining rings, again with their joints
120
degree apart and turning the shaft
between each fitting each ring to ensure free movement.
17.
Place the split glands on the top of the top ring and press it down slightly.
18.
Tighten the nuts evenly to finger pressure on the split gland studs (see Fig. No.
28
-d).
8.3. Dismantling
