Pressure Part Failures in Vintage Boilers - PowerPoint PPT Presentation

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Pressure Part Failures in Vintage Boilers

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Thermal Fatigue Cracking at the Toe of Superheater Outlet Stub to Header Weld ... Slag Screen Tube Approximately 1' Out From Toe of Seal Weld at Drum Penetration ... – PowerPoint PPT presentation

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Title: Pressure Part Failures in Vintage Boilers


1
Pressure Part Failures in Vintage Boilers
2
As our power stations increase in age, so does
the frequency and mechanisms of pressure part
failures.
3
Three Commonly Occurring Failures in Older Power
Plants Include
  • Fatigue Related Failures
  • Overheating Related Failures
  • Erosion Related Failures

4
Fatigue Failures
  • Fatigue related failures can occur due to cyclic
    bending action such as thermal expansion and
    contraction in headers

5
Thermal Fatigue Cracking Failure at Toe of
Extended Surface Boiler Stub to Header Weld With
Resulting Header Erosion Damage
6
Thermal Fatigue Cracking at the Toe of
Superheater Outlet Stub to Header Weld
7
Thermal Fatigue Cracking Failure in Slag Screen
Tube Approximately 1 Out From Toe of Seal Weld
at Drum Penetration
8
Overheating Related Failures
  • Overheating failures can occur due to chronic or
    acute overheating situations

9
Creep Failure in Superheater Tube Due to Chronic
Overheating (T-22 Material)
  • Chronic Overheating Can Be Caused By Improper
    Superheater Temperature Control

10
Creep Failure in Superheater Tube Due to Chronic
Overheating (T-22 Material)
11
Hot Tensile Overload Failure
  • Hot Tensile Overload Failure Can Result From Loss
    of Circulation in Water Wall Tubes With Resulting
    Acute or Chronic Overheating of the Tube

12
Erosion Related Failures
  • Erosion Related Failures Can Occur Due to Fly Ash
    Erosion or From Steam and/or Water Induced
    Erosion

13
Thin Lipped Failure of Water Wall Tube Due to
Soot Blower Steam Erosion
14
Superheater Header Erosion Due to Steam Jet From
Thermal Fatigue Crack
15
Flow Induced Erosion/Departure From Nucleate
Boiling Failure In Extended Surface Boiler Tube
16
Thin Lipped Rupture Due to Flyash Erosion on
Water Wall Tube Awarded to Rent-A-Maintenance-Mana
ger Claude Smith Smitty
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