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KERR UNIT 3 THRUST BEARING UPGRADE
•3 UNITS
•2007 – UNIT 3 FRANCIS TURBINE WAS UPGRADED
•OUTPUT INCREASED FROM 71 MW TO 90 MW
UNIT 3 THRUST BEARING
•AUGUST 2014 WIPED FIRST TIME
•OCTOBER 2015 WIPED AGAIN
RESULTSLOWER OPERATING TEMPERATURE: 13 – 20 DEG C COOLER
NO HIGH PRESSURE OIL LIFT PUMP NEEDED
TOTAL THRUST STATIC PLUS DYNAMIC – 583.2 TONS
429 PSI LOADING
BABBITT WAS AT 85.8% OF DESIGN
PTFE IS AT 47.6% OF DESIGN
lbs. (=tons) lbs. (=tons)
Turbine
Runner Wgt 110000 55 130000 65
Shaft Wgt 60000 30 60000 30
Total 170000 85 190000 95
Est. Hyd Thrust 290000 145 433666 216.833
Total Turb incl thrust 460000 230 623666 311.833
Generator Rotating element
Shaft 60000 30 60000 30
Rotor 450000 225 450000 225
Total 510000 255 510000 255
Exc Rotor 17660 17660 8.83
Pilot Exciter Rotor 5000 5000 2.5
Misc. 10000 5 10000 5
% Increase
1002660 501.33 1166326 583.163 16.3%
712660 356.33 732660 366.33 2.8%
290000 145 433666 216.833 49.5%
368.6 428.8 16.3%
81.9% 95.3%
47.6%
2720 in2
2720 in2
450 psi
1767.75 psi
900 psi
TOTAL W/ HYD THRUST
TOTAL STATIC WEIGHT
HYD THRUST ONLY
Existing Old Turbine Revised Wts
2016 Actual Values Per Load Cells
Thick Runner w/ Refined Thrust
Suggest above amount add to Rotor
Thrust @181.44 ft Head & 70% Gate
Proposed Voith
Thrust Shoe Loading Tot Wt (psi)
Babbitt shoe bearing area =
Babbit shoe design limit =PTFE shoe Bearing Area =
PTFE shoe design limit =
% of Max Babbitt Bearing Capacity =
% of Max PTFE Bearing Capacity =
Shoe
No. 1 21 44 47 49 50 52 52 53 54 55 55 56 56 56 57 57 57 57 57
Shoe
No. 2 2016 21 47 49 52 53 55 55 56 57 58 59 59 60 60 60 60 60 60 61Shoe
No. 2 2007 20 67 17 69 16 71 17 73 16 74 15 74 15 75 15 75 15 75 76
Shoe
No. 3 2016 21 46 48 51 52 54 54 55 56 57 58 58 59 59 59 59 59 59 60Shoe
No. 3 2007 15 61 13 64 13 67 14 69 13 70 13 71 12 71 13 72 13 72 73
Shoe
No. 4 21 45 47 50 51 53 53 54 55 56 57 58 58 58 58 58 58 58 59
Shoe
No. 5 21 44 47 49 51 53 53 54 55 56 56 57 57 57 57 57 57 57 58
Shoe
No. 6 2016 21 39 42 45 47 49 50 51 52 53 54 54 55 55 55 55 55 55 56Shoe
No. 6 2007 28 67 24 69 22 71 22 73 20 73 21 75 20 75 20 75 20 75 76
Shoe
No. 7 21 42 44 46 48 50 50 51 51 52 53 53 54 54 54 54 54 54 55
Shoe
No. 8 21 44 46 48 50 52 53 53 54 55 56 57 57 57 57 57 57 57 58
Oil 2016 20 33 33 35 35 37 37 38 38 39 40 40 40 41 40 41 41 40 42
Oil 2007 6 39 6 41 7 44 8 46 8 47 7 47 7 48 7 48 9 49 49