Design Basis
In NACE MR0175 WCB Trunnion Ball Valve Class 600, the Trunnion Ball Valve construction determines the closure support, body arrangement and maintenance approach. Confirm bore or flow path, body joint, stem/shaft retention, seat support, anti-blowout features where applicable and access requirements against the approved GA.
Pressure-Boundary Material
For NACE MR0175 WCB Trunnion Ball Valve Class 600, the pressure boundary is WCB. Cast carbon steel for general hydrocarbon and process pressure boundaries. Because this valve is Class 600 with Flanged / BW, verify the material condition, trim compatibility, bolting and any PMI/NDE or corrosion-control requirement as one package.
Pressure Class and Piping Interface
For NACE MR0175 WCB Trunnion Ball Valve Class 600, the specified rating is Class 600 and the piping interface is Flanged / BW. Higher-pressure service where pressure-boundary dimensions, bolting and operating loads become more significant. The project can select flanged or butt-weld ends, so face-to-face, flange facing or weld-end preparation must match the piping class. Final dimensions and pressure-temperature suitability must therefore be checked against the selected material and design temperature, not inferred from class alone.
Seat and Seal Arrangement
For NACE MR0175 WCB Trunnion Ball Valve Class 600, the listed sealing basis is Project Specific. Single-piston-effect seating can provide self-relieving cavity behavior under the defined pressure relationship. Confirm leakage acceptance, pressure/temperature limits and cycling together with the Class 600 loading and the selected Gear / Actuator operating method.
Operation and Actuation
For NACE MR0175 WCB Trunnion Ball Valve Class 600, operation is Gear / Actuator. Gear or powered actuation should be selected from the valve torque curve, maximum differential pressure, operating frequency and required closing time. The final operator or actuator basis should use the actual size, maximum differential pressure, Project Specific friction/seating behavior and required operating or emergency time.
Service Conditions
NACE MR0175 WCB Trunnion Ball Valve Class 600 is explicitly associated with sour-service material control; confirm the service-specific material, sealing, inspection and qualification requirements in the purchaser specification.
Inspection and Testing
For NACE MR0175 WCB Trunnion Ball Valve Class 600, tie MTC/heat traceability, dimensional inspection, PMI/NDE where specified, shell/seat testing, coating checks, witness points and final records to the approved API 6D datasheet and ITP.
Documents Before Release
The manufacturing release for NACE MR0175 WCB Trunnion Ball Valve Class 600 should reference the approved GA, material/trim schedule, seat/seal definition, operator or actuator data, test scope and required final documentation.