duvha 2011 overspeed testing failure v2
TRANSCRIPT
![Page 1: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/1.jpg)
Steam Turbine Failure During Overspeed Test
Eskom Duvha Unit No. 49 February 2011
Republic of South Africa
![Page 2: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/2.jpg)
Updated Presentation Rev 2
• 2 May 2011 expansion of the original presentation from 7 April 2011.
• Additional pictures received via e-mail showing ‘missle’ damage
• Three slides from Eskom presentation on power impact, photographs and explanation that no root cause analysis information will be released until completion of the investigation.
![Page 3: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/3.jpg)
Severe damage to Unit No. 4 after failed overspeed test
![Page 4: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/4.jpg)
Turbine Failure During OverspeedTesting
• Statutory turbine testing (later reported as an overspeed test) ended in severe mechanical damage
• Performed Wednesday night 9 February 2011• The unit was not on load. • Protection on the unit failed leading to rupture• A fire broke out and it was rapidly brought under
control.• Technical review has been launched• Outage estimated up to 18 months
![Page 5: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/5.jpg)
Duvha Station
• 600 MW GEC Alstom Units• Tandem Compound Four Casing Units• 3,000 rpm• Station came on line in November 1975• Common turbine hall• Five sister units undamaged and remained
available for generation
![Page 6: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/6.jpg)
News Release
![Page 7: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/7.jpg)
Intact Unit from Generator End
![Page 8: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/8.jpg)
Damage to Low Pressure (LP) Casings and Cross Over Piping
![Page 9: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/9.jpg)
Severe outer casing rupture LP2
![Page 10: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/10.jpg)
Fire damage at High Pressure (HP) Turbine
![Page 11: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/11.jpg)
Damage at Generator (left) to Exciter (right) Coupling
![Page 12: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/12.jpg)
Coupling Shaft thrown from unit
![Page 13: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/13.jpg)
Shaft thrown from unit
![Page 14: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/14.jpg)
Structural Damage
![Page 15: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/15.jpg)
Damage to roof(20 m above the turbine deck)
![Page 16: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/16.jpg)
Duvha LSB Failure 2003
• Sister Unit No. 2 suffered a last stage blade (LSB) failure on 8 January 2003.
• Similar damage as seen on Unit No. 4 with a fire, ruptured shafts & components leaving the building
• Minimal visible damage to outside of LP casings
![Page 17: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/17.jpg)
Eskom Update
• On 8 April 2011 Eskom issued the ‘Quarterly Update: State of the Power System’
• The following three slides are from that document covering the Duvha incident.
• Source http://www.eskom.co.za/content/PowerSystemUpdateWinter2011final.pdf
![Page 18: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/18.jpg)
Eskom Update
![Page 19: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/19.jpg)
![Page 20: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/20.jpg)
![Page 21: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/21.jpg)
Additional Pictures
• The following pictures were received in April 2011, after the initial batch, and continue to show the damage to the turbine generator set.
• The pictures also show extensive damage done to the plant by ‘missiles’ created by thrown machine components.
![Page 22: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/22.jpg)
![Page 23: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/23.jpg)
![Page 24: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/24.jpg)
![Page 25: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/25.jpg)
![Page 26: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/26.jpg)
![Page 27: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/27.jpg)
![Page 28: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/28.jpg)
![Page 29: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/29.jpg)
![Page 30: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/30.jpg)
![Page 31: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/31.jpg)
![Page 32: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/32.jpg)
![Page 33: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/33.jpg)
![Page 34: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/34.jpg)
![Page 35: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/35.jpg)
![Page 36: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/36.jpg)
![Page 37: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/37.jpg)
![Page 38: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/38.jpg)
![Page 39: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/39.jpg)
![Page 40: Duvha 2011 Overspeed Testing Failure V2](https://reader035.vdocument.in/reader035/viewer/2022081715/5449fc7bb1af9ff0638b47ed/html5/thumbnails/40.jpg)
The End
More to be learnt