Severe Service Technology, Inc. SST Severe Service Metal Seated Ball Valves Taking Sealing to its Practical Limits

Transcription

1 Severe Service Technology, Inc. SST Severe Service Metal Seated Ball Valves Taking Sealing to its Practical Limits

2 Incorporated in 1994 Over 15,000 valves shipped Total Turnkey Operations Corporate and Design Offices: Houston, TX Manufacturing, Assembly & Test: Monterrey, Mexico Industries: Power Generation Refining Chemical Mining Paper

3 All Designs via SOLIDWORKS Simulation FEA Deflection Analysis Stress Analysis Thermal Analysis

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5 Metal Seated Valves with Special Coatings on Sealing Surfaces Zero Leakage per MSS-SP-61 High Pressure and Temperature applications (ASME Class 1500 to 4500)

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7 AEP Allegheny Power Basin Electric Power ENTERGY Florida Power & Light Gainesville Regional Utilities Indianapolis Power & Light Foster Wheeler Minnkota Power Cooperation Northern States Power / XCEL Babcock Power Vogt Power Alliant Energy American Electric Associated Electric Dairyland Electric Coop Florida Power & Light Invenergy Southern Cal Edison U.S. Generating West Texas Utilities Houston Lighting & Power Detroit Edison Consumers Power Black & Veatch Duke Power Bibb Engineering Alstom TVA WE Energies Kansas City Power & Light Mid American Energy Omaha Public Power Progress Energy Portland General Electric Nebraska Public Power

8 Globe valve discs and seats are subjected to erosion and seat wear due to their location within the body and flow path Ball valves are position seated and utilize system pressure to seal Ball valves eliminate the need or use of external handle forces (i.e., cheater bar) to apply additional torque to close valve and the potential to deform seating surfaces, which results in seat leakage. Ball valves are fast and easier to manual operate than Globe Valves Ball Valve Globe Valve

9 Sizes: 1/2 to 2-1/2 (one-piece body) ASME Class: 1500, 3200 and 4500 End Connections: Socketweld & Buttweld Bore: Reduced Sealing: Uni-directional Actuation: Lever, Gear, Electric and Pneumatic

10 Item/Part Body Seat Ball Push Ring Spring Stem Packing Materials A105 Carbon Steel F11/F22/F91 Chrome Moly 316 Stainless Steel 410 Stainless Steel or Inconel Stainless Steel or Inconel Stainless Steel A286 Stainless Steel Hard-faced Stainless Steel or Inconel 718 Grafoil

11 Flow

12 ISO Mounding Pad 1 Piece Body

13 Stem Live Loaded Packing Gland Downstream Seat Push Ring Spring Transition Piece Retaining Ring Ball

14 Typically harder mating/sealing surfaces will perform better and last longer. Many Globe valves use Stellite (solid or coating) for valve seats and discs. SST applies Chromium Carbide utilizing the HVOF process. Material Hardness (HRc) Stellite Stellite Chromium Carbide 53-57

15 High Velocity Oxygen Fueled (HVOF) process; using oxygen, hydrogen and Chromium Carbide powder applied at MACH 5 Coatings are applied in-house

16 Downstream Seat Ball Push Ring

17 Application Conditions Size Turbine Drain Lines Up to F 1 2-1/2 Blowdown Up to F 1 3 Boiler Drain & Vent Lines Up to F 1 2-1/2

18 Feedwater Drains Gauge Glass Drain and Isolation Boiler/Reheat/Superheat Drain, Vents and Root Economizer Stop Flash Tank HP Feedwater System IP Heater Applications Blowdown Condensate Drain Mud Drum Drain Steam Trap Isolation Sootblower System Inert Steam System HP Turbine Steam Supply & Extraction Emergency Relief Valve (SSI) Superheater Startup Vent Valve (SVV)

19 Digester Blowdown Valves Green Liquor Valves Black Liquor Valves Steam Drain & Vent Valves

20 SST

21 Manual Valve (normally open) Pneumatic Valve (normally closed)

22 Description and Application: The Superheater Startup Vent Valve is open during boiler startup, up to 30% boiler capacity. Valve is used to vent low temperature and pressure saturated steam. During initial operation of a HRSG or Boiler, bypassing main steam around the steam turbine to the atmosphere so the unit does not come up to temperature too quickly.

23 Downstream Seat Stem Upstream Seat Spring Seat Landing Ball

24 Sizes, Bore and Overall Length designed to meet customer requirements Body Material: F22/F91 Chrome Moly Trim Material: 410 Stainless Steel or Inconel 718 with Chromium Carbide coating

25 ERV / PORV Ball Valve (supplied by others) Model SSI Isolation Valve Main Steam Relief Valve Main Steam Line

26 Description and Application: Model SSI is the Isolation Valve installed under the ERV or PORV. The SSI is normally open and is used when maintenance is required on the ERV or PORV. ERV or PORV (supplied by others) is a pneumatic actuated pressure relieving valve. Their purpose is to prevent or reduce the number of lifts of the Main Steam Safety Valve, thus extending their life. Installed in conjunction with automated or electronic controls for control of boiler capacity or overprotection of the boiler.

27 Live Loaded Packing ISO Standard actuator bolt pattern for easy automation Body End Adapter Body Gasket

28 Seat Landing Upstream Seat Downstream Seat Spring Inner Collar Ball

29 Sizes: Up to 2-1/2 Class: Up to 4500 Bore: Full and Reduced* Body Material: F22/F91 Chrome Moly Trim Material: 410 Stainless Steel with Chromium Carbide Coating * Per Customer s requirement

30 MSS-SP 61: Pressure Testing of Steel Valves ASME B16.34: Valves Flanged, Threaded and Welding End ASME B31.1: Power Piping Code

31 Body Hydrostatic Test: 1.5 times MCWP at 100 F (38 C) Seat Closure Test: 1.1 times MCWP (in preferred direction) Acceptance Criteria: 10 ml/hr x nominal valve size (inches)

32 Questions or Comments?