Flowserve VTP Wet Pit - Manual (Page 41)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 41 of 76 flowserve.com
Then repeat this step for the set of jackscrews
located 90 degrees to the first set. Once all
readings are within 0.05 mm (0.002 in.) tighten
motor bolts and check for any movement in
readings.
g) Set the impeller setting gap between the
adjusting nut and the driver portion of the
coupling. See impeller setting data supplied
along with the pump. If this information is not
found, contact Flowserve. Align the match marks
on the pump half coupling with the driver half
coupling. On pumps with enclosed impellers the
match marks can be lined up by increasing the
impeller gap until the marks are in line with the
driver half coupling marks.
On pumps with semi-open impellers,
the match marks probably will not be in line when
the gap is set. DO NOT try to align the marking
on the nut with the other markings.
For pumps with enclosed impellers go to step (h).
h) Using 2 bolts of the coupling, at 180 degrees to
each other, slowly raise pump half coupling until
impellers are just lifted off the seat (This can be
gauged by trying to turn shaft by hand. At the
point the impellers are lifted the pump will turn).
Be sure to lift both sides evenly.
i) Measure the resultant gap between the motor half
coupling and the adjusting nut.
j) Find the difference between the original gap and
the new gap. Add this difference to the original
gap and reset the adjusting nut.
k) Bolt the coupling together and tighten bolts by
tightening opposite sides.
l) Remove wooden wedges, if used. Mount
magnetic base on pump and set the tip of indicator
on the shaft just above the seal. Slowly rotate the
shaft and note the T.I.R. reading.
Unless otherwise specified, the allowable T.I.R.
readings are:
 WA and WSA couplings 0.10 mm (0.004 in.)
 PA and PSA couplings 0.05 mm (0.002 in.)
If the reading is larger than the allowable values
specified above, unbolt the pump and rotate the driver
portion of the coupling to different hole and repeat
steps (h) and (i) until acceptable readings are
obtained.
m) If a mechanical seal is used, adjust the
mechanical seal at this time.
Direction of Rotation 5.4
Ensure the pump is given the same
rotation as specified or as marked on the
pump/driver. Please contact Flowserve
representative, if you have any questions before the
startup.
To avoid dry running the pump must either be filled
with liquid or have the flexible coupling disconnected
before the driver is switched on.
If maintenance work has been carried
out to the site's electricity supply, the direction of
rotation should be re-checked as above in case the
supply phasing has been altered.
Guarding 5.5
Guarding is supplied fitted to the pump set.
Fasteners for guards must remain captive in the guard
to comply with the Machinery Directive 2006/42/EC.
When releasing guards, the fasteners must be
unscrewed in an appropriate way to ensure that the
fasteners remain captive. Whenever guarding is
removed or disturbed ensure that all the protective
guards are securely refitted prior to start-up
Priming and Auxiliary Supplies 5.6
Ensure electrical, hydraulic,
pneumatic, sealant and lubrication systems (as
applicable) are connected and operational.
Ensure the inlet pipe and pump
casing are completely full of liquid before starting
continuous duty operation.