Goulds Pumps VRS - IOM - Manual (Page 19)

DIRECT CONNECT PUMPS
ALIGNMENT CRITERIA
Disconnect coupling halves before proceeding with the
alignment. Check for parallel and angular alignment with
either the Dial Indicator Method or the Straight Edge
Method outlined below.
The faces and outside diameters of the coupling halves
must be square and concentric with the bores. Good
alignment is achieved when the dial indicator readings for
both parallel and angular misalignment are 0.003 in
(0.076 mm) total indicator reading (TIR) or less when the
pump and driver are at operating temperature (see Final
Alignment). Figure 3 provides a representation of what to
look for.
SET UP
s
! WARNING
Before beginning any alignment procedure, make sure
driver power is locked out.
1. Mount two dial indicators on one of the coupling
halves (X) so that they contact the other coupling half
(Y) as shown in Figure 4.
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 TECHNIQUES
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 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), Figure 3, does not vary by more than 0.003 in
(0.076 mm) as measured at four points on the coupling
periphery 90 degrees apart at operating temperature. There
are two methods outlined below which are acceptable to
achieve alignment.
VRS IOM - 5/08
13
Figure 3
Direct Connect Alignment
Angular
Misalignment
Parallel
Misalignment
Perfect
Alignment
Figure 4
Dial Indicator Setup
Figure 5
Directions of viewing coupling
from top of pump
3