33
2.11 Inspection Checklist
Hydraulic Turbines and Large Pumps Inspection Interval
1. Runner or impeller NS A
2. Spiral case and draft tube or NS A
pump casing and suction inlet
3. Wearing rings NS A
4. Main shaft packing W NS
5. Mechanical seals W NS
6. Wicket gates and facing plates NS A
7. Servomotors, shift ring, and wicket gate linkage NS A
8. Bearings NS D A
9. Shaft and coupling A
10. Generator or motor rotor A
11. Air coolers NS A
12. Unit brakes NS A
13. Generator carbon dioxide
2. Spiral case and draft tube or NS A
pump casing and suction inlet
3. Wearing rings NS A
4. Main shaft packing W NS
5. Mechanical seals W NS
6. Wicket gates and facing plates NS A
7. Servomotors, shift ring, and wicket gate linkage NS A
8. Bearings NS D A
9. Shaft and coupling A
10. Generator or motor rotor A
11. Air coolers NS A
12. Unit brakes NS A
13. Generator carbon dioxide
(CO2)
system S A
14. Inspection reports A
Auxiliary Pumps
15. Pump impeller or rotor and casing
NS A
16. Shaft and coupling
W A
17. Packing
NS W
18. Mechanical seals
W
19. Bearings
W
20. Pressure relief valves
NS
21. Eductors
NS
D - Daily
W - Weekly
M - Monthly
S - Semiannual
A - Annual
NS - Not scheduled (extraordinary maintenance; usually 5-year or longer intervals)
W - Weekly
M - Monthly
S - Semiannual
A - Annual
NS - Not scheduled (extraordinary maintenance; usually 5-year or longer intervals)
Hydraulic Turbines and Large Pumps
1.
Runner or impeller
Annual. Examine runner or impeller thoroughly for cavitation or other damage. Use a
nondestructive test to check for cracks in runner buckets or impeller vanes. Refer to FIST,
nondestructive test to check for cracks in runner buckets or impeller vanes. Refer to FIST,
Volume
2-5, Turbine Repair
for repair recommendations and techniques.
Not Scheduled. Remove runner or impeller and inspect and repair areas not normally accessible.