Severe Service Technology, Inc. SST Severe Service Metal Seated Ball Valves
Severe Service Technology, Inc. • Incorporated in 1997 • Over 15,000 valves shipped • Total Turnkey Operations • Corporate and Design Offices: Houston, TX • Manufacturing, Assembly & Test: Monterrey, Mexico • Industries: • Power Generation • Process • Mining • Paper
FEA • Deflection Analysis • Stress Analysis • Thermal Analysis Design – Computer Optimized All Designs via SOLIDWORKS Simulation
What are Severe Service Valves? • Metal Seated Valves with Special Coatings on Sealing Surfaces • Zero Leakage to API, MSS-SP-61, and ISO Standards and Procedures • High Pressure (500+ psi /35+ bar) • High Temperature (up to 1500F /815 C) • Erosive or Corrosive Media (i.e., bitumen, copper, iron ore, gold, silver, and salt water)
Model SSM - Product Overview • Sizes: 1/2 to 36” • ASME Class: 150 to 2500 • End Connections: RF Flanged, RTJ, Greylock, Buttweld and Socketweld • Bore: Full and Reduced • Side and Top Entry • Trim Materials: Metallic and Ceramic • Sealing: Symmetrical (Uni and Bi-directional) • Actuation: Lever, Gear, Electric, Pneumatic and Hydraulic
Design • Two or three piece side-entry floating ball valve design with: • Live-load Stem Packing Gland • Scraper Seats • Downstream Seat Retainer • “Flush-Out” Body cavity • ISO Mounting Pad • Optional “Portable Flushing System”. • Also available in Top-Entryfloating ball design with “caged trim” • Provides installation of internals (ball, seats, and springs) while valve remains in pipeline. • In certain conditions this design greatly reduces downtime and cost versus removing existing valve.
Standard Materials Consult Factory for other materials
Model SSM: Design Overview Live-Loaded Packing Gland Stem End Adapter Body Spring Spring Seat Ball Seat Spiral Wound Gasket
Symmetical Design Spring Spring Seat Seat • Design can be used for both Uni- and Bi-Directional applications • Reduce requirement for spare valves
High-Tech Coatings • High Velocity Oxygen Fueled (HVOF) process; using oxygen, hydrogen and Tungsten Carbide powder at MACH 5 to 53-57 Rc harness • Spray and Fused: Colmonoy (Nickel based) provides very high hardness (50-53 HRC) and extremely good wear and abrasion resistance
“Flush-Out” Body Profile Valve Open Valve Closed Upon initial opening some material will enter body cavity. Upon valve re-opening, material will “flush-out” downstream of Ball in preferred flow direction
Sealing Design Slurry O-Ring eliminates material from getting behind Seat. E-Ring eliminates material from getting behind Seat Spring Slurry Slurry
Spring Spring is located above the Seat (not behind Seat) and out of the flow path. Material: Inconel 718 Slurry Flow
Scraper Seats Knife edge design assists in removal of particulate matter from Body cavity when valve is cycled
Stem Retention System Retention ring prevents bottom of Stem from making direct contact with Ball Slot, thereby eliminating possibility of damage during actuator installation
Codes and StandardsDesigned, Manufactured & Tested • API 598: “Valve Inspection and Testing” • API 608: “Metal Ball Valves – Flanged, Threaded and Welding End” • ISO 5208: “Pressure Testing of Metallic Valves” • MSS-SP-61 “Testing” • ASME B31.3 “Process Piping” • ASME B16.34 “Valves – Flanged, Threaded and Welding End” • Other local requirements
Testing • Tested to API 598 and MSS-SP-61 • Body Hydro at 1.5 times MCWP • Seat Tested in preferred direction at 1.1 times MCWP
Product Field Service • SST will respond within 48 hours • “Service Plan” • Troubleshooting • English and Spanish speaking Field Technicians
Customers • Dofasco Steel • Rio Tinto/Quebec Iron and Titanium • Sudbury Mining • Lakefield Research & Dev. • Kilborn Engineering • VALE/Inco • SNC Lavalin • CAP Mineria/Hierro Atacama
Mining & Mineral Applications • Autoclaves: SST provides severe service valves for leaching processes (i.e., HPAL) where both high pressure and temperature are present. Valves are also designed for erosive and corrosive applications such as autoclave discharge, vent, isolation, and feed. • Roasters: A dry process involving gas-solid reaction at very high temperatures to purify the metal components. Severe service valves are used for isolation and drain. • Tailings: A waste slurry product of fine minerals and water which remain after extracted from unusable ore produced by the milling operation.
Mining Applications • Tailings: A waste slurry product of fine minerals and water which remain after extracted from unusable ore produced by the milling operation. • Floatation Cells / Column Thickeners: A method to separate minerals depending on their ability to attach to air bubbles and carry them to the surface. • High Pressure Leaching: Where cyanide is added to a precious metal (i.e. gold) and leaching the mineral into solution. • Oil Sands: Severe service valves are used in froth treatment, slurry production processes and steam injection in Steam Assisted Gravity Drain (SAGD) systems.
Slurry Pipeline Applications • Operating and Standby Pump Stations: Severe service ball valves are used to prevent slurry leaking (zero leakage and full differential pressure) back to an idle pump. Valves can be used for both suction and discharge sides for pump isolation. • Choke Stations: Where pressure built up must be reduced or eliminated to maintain safe pipeline operation and provide back-pressure to provide constant flow. Severe service ball valves are used to divert flow to the Choke Station. When closed, the ball valves must provide zero leakage at full differential pressure.
Slurry Pipeline Applications • Isolation Stations: Valves are required to operate in the event of major rupture to the pipeline. Placed at certain intervals, ball valves can isolate sections of the pipeline. It is common to have two valves in series (“Cut and Seal”) where one is the flowing valve (Cut) and one is the isolation valve (Seal). SST’s full-ported valves are also designed for pig launching and receiving stations. • Instrument Isolation: Control and measurement systems are located the length of the pipeline. These small severe service valves are used to isolate instruments for repair, calibration or replacement while the pipeline is in normal operation. • High-Pressure Dewatering: Process where high-pressure water is pumped to the surface from underground mining applications.