Presentation on theme: "Severe Service Metal Seated Ball Valves"— Presentation transcript:
1Severe Service Metal Seated Ball Valves Severe Service Technology, Inc.SSTSevere Service Metal Seated Ball Valves“Taking Sealing to its Practical Limits”
2Severe Service Technology, Inc. Incorporated in 1994Over 15,000 valves shippedTotal Turnkey OperationsCorporate and Design Offices: Houston, TXManufacturing, Assembly & Test: Monterrey, MexicoIndustries:Power GenerationRefiningChemicalMiningPaperOur state of the art manufacturing facility is fully equipped with the latest technology inmachining, thermal spraying and testing equipment. Our rigid, quality control standardsensure that our products are manufactured with detailed precision that meet or exceedANSI, AISI, API and MSS-SP-61 requirements.
3Design – Computer Optimized All Designs via SOLIDWORKS SimulationFEADeflection AnalysisStress AnalysisThermal AnalysisFinite Element Analysis
4Plant: Monterrey, Mexico 16,000 square feetMachining operationThermal Spraying performed on-site
5What are Severe Service Valves? Metal Seated Valves with Special Coatings on Sealing SurfacesZero Leakage per MSS-SP-61High Pressure and Temperature applications (ASME Class 1500 to 4500)
7Customers & EPC’s AEP Southern Cal Edison Allegheny Power Basin Electric PowerENTERGYFlorida Power & LightGainesville Regional UtilitiesIndianapolis Power & LightFoster WheelerMinnkota Power CooperationNorthern States Power / XCELBabcock PowerVogt PowerAlliant EnergyAmerican ElectricAssociated ElectricDairyland Electric CoopInvenergySouthern Cal EdisonU.S. GeneratingWest Texas UtilitiesHouston Lighting & PowerDetroit EdisonConsumers PowerBlack & VeatchDuke PowerBibb EngineeringAlstomTVAWE EnergiesKansas City Power & LightMid American EnergyOmaha Public PowerProgress EnergyPortland General ElectricNebraska Public PowerHistory & Experience
8Ball vs. Globe ValvesGlobe valve discs and seats are subjected to erosion and seat wear due to their location within the body and flow pathBall valves are position seated and utilize system pressure to sealBall 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 ValvesBall ValveGlobe ValveReinforce points
9SSV - Product Overview Sizes: 1/2 to 2-1/2” (one-piece body) ASME Class: 1500, 3200 and 4500End Connections: Socketweld & ButtweldBore: ReducedSealing: Uni-directionalActuation: Lever, Gear, Electric and PneumaticProduct availability
13SSV: Trim/Internals Stem Live Loaded Packing Gland Push Ring Downstream SeatSpringTransition PieceRetaining RingBall
14Sealing 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.MaterialHardness (HRc)Stellite 636-45Stellite 2127-40Chromium Carbide53-57Review
15High-Tech Coatings High Velocity Oxygen Fueled (HVOF) process; using oxygen, hydrogen and Chromium Carbide powder applied at MACH 5Coatings are applied in-house
16Coated and Mate-Lapped Parts Downstream SeatBallPush Ring
17Applications: Power Generation ConditionsSizeTurbine Drain LinesUp to F1 – 2-1/2”BlowdownUp to F1 – 3”Boiler Drain & Vent Lines
21Model SVV Superheater Startup Vent Valve (Sky Vent) Manual Valve(normally open)Pneumatic Valve(normally closed)The Vent Valve is open during boiler startup, to up to 30% Boiler capacity. Valve is used to vent low temperature and pressure saturated steam until the conditions match the turbines.
22Model SVV Superheater 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.
24Model SVV Superheater Startup Vent Valve Sizes, Bore and Overall Length designed to meet customer requirementsBody Material: F22/F91 Chrome MolyTrim Material: 410 Stainless Steel or Inconel 718 with Chromium Carbide coatingProduct Line
25Model SSI ERV/PORV Isolation Valve Ball Valve(supplied by others)Main Steam Relief ValveModel SSIIsolationValveMain Steam Line
26Model SSI ERV/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.
27ISO Standard actuator bolt pattern for easy automation Model SSI (SSG-1)Live Loaded PackingISO Standard actuator bolt pattern for easy automationBodyEnd AdapterBody Gasket
28SSG-1 Trim Seat Landing Upstream Seat Downstream Seat Spring Inner CollarBall
29Model SSI ERV/PORV Isolation Valve Sizes: Up to 2-1/2”Class: Up to 4500Bore: Full and Reduced*Body Material: F22/F91 Chrome MolyTrim Material: 410 Stainless Steel with Chromium Carbide Coating* Per Customer’s requirementProduct Line
30Applicable Codes and Standards Designed, 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”Review
31100% 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 nominalvalve size (inches)MCWP = Max Cold Water Pressure