severe service metal seated ball valves taking sealing to its practical limits severe service...
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Severe Service Metal Seated Ball Valves
“Taking Sealing to its Practical Limits”
Severe Service Technology, Inc. SST
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Severe Service Technology, Inc.
• 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
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Design – Computer Optimized
FEA• Deflection
Analysis
• Stress Analysis
• Thermal Analysis
All Designs via SOLIDWORKS Simulation
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Plant: Monterrey, Mexico
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• 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)
What are Severe Service Valves?
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Valves for
Power Generation Plants
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Customers & EPC’s• 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
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Ball vs. Globe Valves
• 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
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SSV - Product Overview
• 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
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SSV: Standard Materials
Item/Part Materials
Body A105 Carbon SteelF11/F22/F91 Chrome Moly316 Stainless Steel
Seat 410 Stainless Steel orInconel 718
Ball 410 Stainless Steel orInconel 718
Push Ring 410 Stainless Steel
Spring A286 Stainless Steel
Stem Hard-faced Stainless Steel orInconel 718
Packing Grafoil
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SSV: General Design
Flow
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SSV: Design
ISO Mounding Pad
1 Piece Body
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SSV: Trim/Internals
Live Loaded Packing Gland
Stem
Push RingDownstream Seat
Retaining Ring
Transition Piece
Ball
Spring
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Sealing Surfaces – Hardness
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 6 36-45
Stellite 21 27-40
Chromium Carbide 53-57
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High-Tech Coatings
High Velocity Oxygen Fueled (HVOF) process; using oxygen, hydrogen and Chromium Carbide powder applied at MACH 5
Coatings are applied in-house
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Coated and Mate-Lapped Parts
Push Ring
Ball
Downstream Seat
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Applications: Power Generation
Application Conditions Size
Turbine Drain Lines
Up to 2500 psi @ 1050 F 1 – 2-1/2”
Blowdown Up to 2600 psi @ 700 F 1 – 3”
Boiler Drain & Vent Lines
Up to 2500 psi @ 1050 F 1 – 2-1/2”
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Applications: Power GenerationFeedwater DrainsGauge Glass Drain and IsolationBoiler/Reheat/Superheat Drain, Vents and RootEconomizer StopFlash TankHP Feedwater SystemIP Heater ApplicationsBlowdownCondensate DrainMud Drum DrainSteam Trap IsolationSootblower SystemInert Steam SystemHP Turbine Steam Supply & ExtractionEmergency Relief Valve (SSI)Superheater Startup Vent Valve (SVV)
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Applications: Pulp & Paper
• Digester Blowdown Valves• Green Liquor Valves• Black Liquor Valves• Steam Drain & Vent Valves
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New Products
SST
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Model SVVSuperheater Startup Vent Valve (Sky Vent)
Manual Valve(normally open)
Pneumatic Valve
(normally closed)
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Model SVVSuperheater Startup Vent Valve
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.
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Model SVVSuperheater Startup Vent Valve
Ball
Upstream Seat
Spring
Downstream Seat
Seat Landing
Stem
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Model SVVSuperheater Startup Vent Valve
• 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
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Model SSIERV/PORV Isolation Valve
ERV / PORV Ball Valve
(supplied by others)
Main Steam Line
Main Steam Relief ValveModel SSI
Isolation Valve
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Model SSIERV/PORV Isolation Valve
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.
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Model SSI (SSG-1)
ISO Standard actuator bolt
pattern for easy automation
Body
End Adapter
Live Loaded Packing
Body Gasket
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SSG-1 Trim
Ball
DownstreamSeat
Spring
Upstream Seat
Inner Collar
Seat Landing
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Model SSIERV/PORV Isolation Valve
• 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
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Applicable Codes and StandardsDesigned, Manufactured & Tested
• MSS-SP 61: “Pressure Testing of Steel Valves”
• ASME B16.34: “Valves – Flanged, Threaded and Welding End”
• ASME B31.1: “Power Piping Code”
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100% Testing MSS-SP-61/API 598
• 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)
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Questions or Comments?