Goulds Pumps 3910 11th ed. - IOM - Manual (Page 18)

ALIGNMENT AND ALIGNMENT CRITERIA
!
Alignment procedures must be followed to prevent
unintended contact of rotating parts. Follow
coupling manufacturer's installation and operation
procedures.
GENERAL CONSIDERATIONS
s
! WARNING
Before beginning any alignment procedure, make sure
driver power is locked out. Failure to lock out driver
power will result in serious physical injury.
To remove coupling guard, refer to coupling guard
installation and disassembly instructions in Appendix I.
The times at which alignment is checked and adjusted are:
Initial Alignment (Cold Alignment) is done prior to
operation when the pump and the driver are at ambient
temperatures.
Final Alignment (Hot Alignment) is done after operation
when the pump and driver are at operating temperatures.
•
After First Run - To obtain correct alignment when
both pump and driver are at operating temperature.
Thereafter, alignment should be checked periodically
in accordance with plant operating procedures.
NOTE: Alignment check must be made if process
temperature changes, piping changes and/or pump
service is performed.
Alignment is achieved by adding or removing shims from
under the flange of the driver and/or shifting driver
horizontally as needed.
NOTE: Proper alignment is the responsibility of the
installer and user of the unit.
Accurate alignment of the equipment must be attained.
Trouble-free operation can be accomplished by achieving
alignment within the levels specified in the following
section.
Three common alignment methods are utilized:
•
Reverse Dial Indicator method is most common.
•
Laser method is similar to reverse dial indicator
method, but uses a laser to obtain the necessary mea-
surements.
•
Dial Indicator (rim-and-face) method.
Follow alignment equipment manufacturer's procedures
when utilizing reverse dial indicator or laser methods. A
detailed procedure for alignment using the dial indicator
(rim-and-face) method is included as Appendix II.
ALIGNMENT CRITERIA
Good alignment is attained when readings as specified in this
section have been achieved with pump and driver at operating
temperatures (final alignment).
Table 2 shows maximum allowable Total Indicator Reading
(T.I.R.) for parallel and angular misalignment.
Table 2
Maximum Allowable
Parallel and Angular Misalignment
Group
Maximum Allowable Misalignment
Parallel Angular
All
0.05 mm
(.002 in.)
0.03 degrees
[0.125 mm/cm (.0005 in. /in.)
of coupling face diameter]
ALIGNMENT TROUBLESHOOTING
18
3910-1
1th IOM 5/08
Problem Probable Cause Remedy
Cannot obtain horizontal (Side-to-Side)
alignment, angular or parallel
Driver flange bolt bound
Loosen motor support hold down bolts and
slide motor support and driver until hori-
zontal alignment is achieved.