Goulds Pumps 3501 Mixer - IOM - Manual (Page 19)

ALIGNMENT CRITERIA
Good alignment is achieved when the dial indicator
readings as specified in the alignment procedure are .05
mm (.002 in.) Total Indicated Reading (T.I.R.) or less
when the mixer and driver are at operating temperature
(Final Alignment).
During the installation phase, however, it is necessary to
set the parallel alignment in the vertical direction to a
different criteria due to differences in expansion rates of
the mixer and driver. For Model 3501,
Table 1 shows
recommended preliminary (cold) settings for electric
motor driven mixers based on different pumpage
temperatures. Driver manufacturers should be consulted
for recommended cold settings for other types of drivers
(steam turbines, engines, etc.).
Table 1
Cold Setting of Parallel
Vertical Alignment
Fluid Temperature Set Driver Shaft
10° C (50° F) .05 mm (.002 in.) Low
65° C (150° F) .03 mm (.001 in.) High
120° C (250° F) .12 mm (.005 in.) High
SET UP
1. Mount two dial indicators on one of the coupling
halves (X) so they contact the other coupling half (Y)
(Fig. 11).
2. Check setting of indicators by rotating coupling half
X to ensure indicators stay in contact with coupling
half Y but do not bottom out. Adjust indicators
accordingly.
MEASUREMENT
1. To ensure accuracy of indicator readings, always
rotate both coupling halves together so indicators
contact the same point on coupling half Y. This will
eliminate any measurement problems due to runout
on coupling half Y.
2. Take indicator measurements with driver feet
hold-down bolts tightened. Loosen hold down bolts
prior to making alignment corrections.
NOTE: Take care not to damage indicators when
moving driver during alignment corrections.
ANGULAR ALIGNMENT
A unit is in angular alignment when indicator A (Angular
indicator) does not vary by more than .05 mm (.002 in.)
as measured at four points 90° apart.
Vertical Correction (Top-to-Bottom)
1. Zero indicator A at top dead center (12 o’clock) of
coupling half Y.
2. Rotate indicators to bottom dead center (6 o’clock).
Observe needle and record reading.
3. Negative Reading - The coupling halves are further
apart at the bottom than at the top. Correct by either
raising the driver feet at the shaft end (add shims) or
lowering the driver feet at the other end (remove
shims) (Fig. 12).
Positive Reading - The coupling halves are closer at
the bottom than at the top. Correct by either lowering
the driver feet at the shaft end (remove shims) or
raising the driver feet at the other end (add shims).
4. Repeat steps 1-3 until indicator A reads .05 mm (.002
in) or less.
Horizontal Correction (Side-to-Side)
1. Zero indicator A on left side of coupling half Y, 90°
from top dead center (9 o’clock).
2. Rotate indicators through top dead center to the right
side, 180° from the start (3 o’clock). Observe needle
and record reading.
3. Negative Reading - The coupling halves are further
apart on the right side than the left. Correct by either
sliding the shaft end of the driver to the left or the
other end to the right.
3501 IOM 11/10 15
3
Fig. 11
Fig. 12