Goulds Pumps 3910 11th ed. - IOM - Manual (Page 71)

APPENDIX II
DIAL INDICATOR (RIM-AND-FACE)
ALIGNMENT PROCEDURE
!
Alignment procedures must be followed to prevent
unintended contact of rotating parts. Follow
coupling manufacturer's installation and operation
procedures.
Appendix II details the procedure to be followed when
using the dial indicator (rim-and-face) method of aligning
pump and motor shafts.
Other alignment methods (reverse dial indicator, laser) are
acceptable. Maximum allowable misalignment criteria for these
methods is shown in the Alignment Procedure.
Good alignment is achieved when the dial indicator
readings as specified in this alignment procedure are equal
to 0.05 mm (.002 in.) Total Indicator Reading (T.I.R.) or
less when the pump and driver are at operating temperature
(Final Alignment).
SET UP
1. Mount two dial indicators on the pump coupling half X so
they contact the driver coupling half Y (Fig. II-A).
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
To ensure accuracy of indicator readings:
1. 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 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 than 0.05 mm (.002 in.) as
measured at four points 90° apart at operating temperature.
Axial Correction
1. Zero indicator A on suction / discharge centerline
(12 o’clock) towards the suction (Fig. II-B).
2. Rotate indicators/coupling halves 180° (6 o’clock).
Observe needle and record reading.
3a. Negative Reading - The coupling halves are farther
apart at the second (6 o’clock) position than at the
intial (12 o’clock) position. Correct by adding shims
in line with the (12 o’clock) position, or by removing
shims in line with the (6 o’clock) position (Fig. II-B).
3b. Positive Reading - The coupling halves are farther
apart at the intial (12 o’clock) position than at the
second (6 o’clock) position. Correct by adding shims
in line with the (6 o’clock) position, or by removing
shims in line with the (12 o’clock) position (Fig. II-B).
3910-
11th IOM 5/08
71
8
Fig. II-A