Goulds Pumps 3296M - IOM - Manual (Page 17)

ALIGNMENT CRITERIA
Good alignment is achieved when dial indicator
readings as specified in the alignment procedure are
.002 in. (.05 mm) Total Indicated Reading (T.I.R.) or
less when the pump 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 pump and driver. Table 1 below shows
recommended cold settings for electric motor driven
pumps 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 Settings of Parallel Vertical Alignment
PUMPAGE
TEMPERATURE
SET DRIVER SHAFT
50°F (10°C) .002in. (.05mm) LOW
150°F (65°C) .001in. (.03mm) HIGH
250°F (120°C) .005in. (.12mm) HIGH
350°F (175°C) .009in. (.23mm) HIGH
425°F (218°C) .013in. (.33mm) HIGH
SET UP
1. Mount two dial indicators on one of the coupling
halves (X) so they contact the other coupling half
(Y) (Fig. 6).
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.
3. 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 that .002 in.
(.05 mm) as measured at four locations 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. 7A).
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 .002 in
(.05 mm) or less.
3296 M Group 6/05
13
3
Fig. 6
Fig. 7A