Page 166 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Rotating Machinery: Practical Solutions

50 STEPS TO ACHIEVE PRECISION ALIGNMENT

1. Assure the equipment is locked out and tagged out.
2. Determine which machine will remain stationary.
3. Remove the coupling guard and other obstructions.
4. Inspect coupling bolts, nuts, washers and keys, and re-
pair as required.
5. Remove all old shims from stationary machine and clean
under feet. Discard any old shims that have burrs, are
torn, or are made of materials other than stainless steel,
brass or plastic.
6. Check stationary equipment for soft feet and repair as
required.
7. Level, center and remove any piping or other stresses
from the stationary equipment, if conditions warrant.
8. Use no more than three shims under any foot.
9. Torque all hold-down bolts.
10. Check coupling end float by barring both machines in
the axial direction. Correct if necessary.
11. Remove all shims from the adjustable machine and
clean under its feet.
12. Check adjustable machine for soft feet, and correct if
necessary.
13. Assemble the alignment fixture on the equipment and
mark its location.
14. Measure and record all machine dimensions.
15. Remove fixture and measure and record bar sag.
16. Lay out the basic graph dimensions.
17. Determine if thermal growth will be considered.
18. Re-install fixture on machine, using marks as a guide to
the correct location.
19. Zero the face indicator and set the rim indicator to the
plus bar sag reading at the 12 o’clock position.
20. Rotate equipment to the 6 o’clock position in the normal
direction of operation using caution not to go past the
mark.