Flowserve LPNV Worthington - Manual (Page 19)

LPNV USER INSTRUCTIONS ENGLISH 87900031 – 06/14
Page 19 of 48
4.3.4 Shims
The shims under pump soleplate at each
foundation bolt should be clean and dry. This is
especially critical for pumps in service for
sometime and need to be realigned. Water, dirt
and rust may change the height of the shim pack
over a period of time. Do not use many thin shims
as this may result in a spongy mounting.
Figure 4.4
Recommended shim design
Move the soleplate vertically by adding or
removing the calculated thickness of shims.
Torque holding down bolts to required values.
4.3.5 Types of misalignment
There are two types of shaft misalignment: angular
and offset. Therefore, two sets of measurements
and corrections are required. Both types of
misalignment can occur in horizontal and vertical
planes and are present in most applications.
A)
Angular misalignment
In angular misalignment, the center line of the
shafts intersect, but are not on the same axis.
Figure 4.5
B) Offset misalignment
In offset misalignment, the shaft center lines are
parallel but do not intersect.
Figure 4.6 – offset misalignment
Figure 4.7 – combination of offset and angular misalignment
4.3.6 Cases that require to check alignment
It is necessary to check alignment
a) Prior to fix the soleplate to foundation to ensure
soleplate is not twisted.
b) After securing the soleplate.
c) After securing suction and discharge piping.
d) While unit is at operating temperature:
On factory assembled units dowels are fitted
between motor stand and soleplate.
Do not attempt any maintenance,
inspection, repair or cleaning in the vicinity of
rotating equipment. Such action could result in
injury to operating personnel.
Before attempting any inspection or
repair on the pump the driver controls must be
in the "off" position, locked and tagged to
prevent restarting equipment and injury to
personnel performing service on the pump.