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					       Superior Turbine Solutions, Inc.
                Steam Path Capabilities
                     Rotor Repair
•   Bucket/Blade Replacement
•   Bucket Cover/Shroud Band Replacement
•   Bucket/Blade Tenon Weld Repairs
•   Tie Wire Repairs
•   Lashing Lug Repairs
•   Erosion Shield Replacement
•   Turbine Rotor Machining
•   Low Speed Balancing
      Superior Turbine Solutions, Inc.
                  Steam Path Capabilities
                       Rotor Repair
• Bucket/Blade Replacement
  Replace buckets/blades on turbine rotors. We can:
       - Remove the old blades from the wheel
       - Coordinate blast clean and N.D.E.
       - Install new blades
       - Layout and punch the new covers
       - Peen tenons
       - Finish machine to O.E.M specifications
      Superior Turbine Solutions, Inc.
                  Steam Path Capabilities
                       Rotor Repair
• Bucket Cover/Shroud Band Replacement
  Two methods to perform this work.
      First Method :
       - Remove the old bucket covers/shroud bands
       - Machine the bucket/blade vane tips to increase the active tenon
         height
       - Install new bucket covers/shroud bands
       - Peen tenons
       - Finish machine to O.E.M specification
     Superior Turbine Solutions, Inc.
                 Steam Path Capabilities
                      Rotor Repair
• Bucket Cover/Shroud Band Replacement
    Second Method :
      - Remove the old bucket covers/shroud bands
      - Do what is known as a “Fox Hole” cover repair (this is done to
        increase the active tenon height)
      - Install new covers/shroud bands
      - Peen tenons
      - Machine new bucket covers/shroud bands back to O.E.M
        specifications
       Superior Turbine Solutions, Inc.
                      Steam Path Capabilities
                           Rotor Repair
• Bucket/Blade Tenon Weld Repair
  During a forced outage or, regular scheduled outage, a customer may have
  problems with their seal strips cutting into the blade shroud bands/covers,
  lifted shroud bands/covers or, simply erosion to the tenons due to poor steam
  quality. We can perform the following repairs:
        - We can remove the old shroud bands/covers
        -   Prepare the tenons for welding
        -   Weld tenons using 410SS filler material
        -   Stress relieve tenons
        -   Grind tenons back to original configuration
        -   Make new fox hole shroud bands/covers
        -   Peen and finish machine.
       Superior Turbine Solutions, Inc.
                     Steam Path Capabilities
                          Rotor Repair
• Tie Wire & Tie Wire Hole Repairs
  Tie wires are used on General Electric style turbines or manufacturers that
  follow General Electric design. At times when a unit is overhauled , cracks
  are found in the tie wire or the tie wire hole in the blade. These can be
  repaired during the overhaul. The normal repairs consist of:

  - Replacing the tie wire
  - Installing a sleeve over the crack in the tie wire
  - Weld repairing the bucket/blade tie wire hole
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
           Rotor Repair
           Cracked Tie Wire
       Superior Turbine Solutions, Inc.
                    Steam Path Capabilities
                         Rotor Repair
• Lashing Lug Repairs
  Lashing lugs are normally found on Westinghouse turbines or other
  manufacturers that follow Westinghouse designs. It’s typical during an
  overhaul to find cracks in the Lashing Lugs. The Lashing Lugs are what
  connect individual blades into blade groupings on the last couple of stages on
  the LP rotor.

  The crack indications are normally ground out, N.D.E. is done to the Lashing
  Lug to insure that all of the crack indications have been removed , then the
  Lashing Lug is re-welded and x-rayed.
       Superior Turbine Solutions, Inc.
                      Steam Path Capabilities
                           Rotor Repair
• Erosion Shield Replacement
  Erosion shields are normally located on the last couple of stages on the LP
  rotor. They are a hardened stellite strip that is installed to help protect the
  leading edge of the blades. After years of operation, missing erosion shields,
  excessive wear, crack indications, or loose bonds may make it necessary to
  replace the shields.
  These can be replaced very easily in the field by :

        -   Removing the old erosion shield
        -   Repairing the blade platform
        -   Fitting a new erosion shield on attaching it using silver soldier
        -   Erosion shield is then ultrasonic tested to insure that they are bonded
            properly.
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
           Rotor Repair
         Remove Erosion Shields
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
           Rotor Repair
          Clean Blade Platform
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
           Rotor Repair
       Silver Solder New Erosion Shield
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
           Rotor Repair
          After Final Polishing
       Superior Turbine Solutions, Inc.
                      Steam Path Capabilities
                           Rotor Repair
• Seal Replacement - Turbine Rotor
  Replacement of the seals on the turbine rotor is very common during an
  overhaul, especially on Westinghouse steam turbines. We can:

        -   Remove the old seal
        -   Clean and inspect groove
        -   Install new seal
        -   Finish machine the seal back to original design
      Superior Turbine Solutions, Inc.
                  Steam Path Capabilities
                       Rotor Repair
• Turbine Rotor Machining

  Various machining operations can be performed to turbine rotors. A
  few examples would be machining of:

  -    Bearing Journals
  -    Re-Machining of Steam Seal Areas (either high/low teeth or
       straight shaft seal areas)
  -    Machining of Inner Stage Areas
  -    Machining of Shroud Bands/Covers
  -    Machining of Replacement Seals
Superior Turbine Solutions, Inc.
        Steam Path Capabilities
             Rotor Repair
 LP Rotor Repair - Removal Of Last Stage Blades
    Superior Turbine Solutions, Inc.
               Steam Path Capabilities
                    Rotor Repair
LP Rotor Repair - View Of Dovetail Before New Blades Are Install
Superior Turbine Solutions, Inc.
         Steam Path Capabilities
              Rotor Repair
LP Rotor Repairs – Installing New L-0 Row Of Blades
Superior Turbine Solutions, Inc.
           Steam Path Capabilities
                Rotor Repair
LP Rotor Repairs – Some Blades Require Machining Before
                 Installing Blade Into Wheel
Superior Turbine Solutions, Inc.
       Steam Path Capabilities
            Rotor Repair
     LP Rotor Repair - Ream L-0 23” Blades
      Superior Turbine Solutions, Inc.
                  Steam Path Capabilities
                       Rotor Repair
LP Rotor Repairs - Tenons are peened after the shroud bands have been
                                 fitted.
Superior Turbine Solutions, Inc.
       Steam Path Capabilities
            Rotor Repair
  LP Rotor Repairs - LP Rotor Machining
       Superior Turbine Solutions, Inc.
                   Steam Path Capabilities
                        Rotor Repair
• Low Speed Balancing

  Low speed balancing can be provide by STS utilizing a Schenck H-90T 100
  Ton Portable Balancing Machine.
     Superior Turbine Solutions, Inc.

Quality parts provided by STS include:

-   Turbine Buckets/Blades      -   Coupling Bolts
-   Shroud Bands                -   Studs
-   Pins/Reamers                -   Nuts
-   Tie Wires                   -   Erosion Shields
-   Segmented Packing           -   J Strip Seals
-   Valve Stems
-   Valve Seats
-   Valve Disks
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
          Turbine Parts
Superior Turbine Solutions, Inc.
      Steam Path Capabilities
          Turbine Parts

				
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posted:12/2/2011
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