Power Generation Market

Nuclear Power Pumps

Formsprag Clutch

ARD Backstopping Clutch

ARD Anti-Rotation Device Clutches
  • Holding torque exceeding 200,000 ft.lbs.
  • Virtually unlimited continuous speed capability through lift-off sprags
  • Many units with greater than 200,000 hours of maintenance-free operation

Formsprag Clutch was instrumental in the development of the long-life Anti-Rotation Device (ARD) on the reactor coolant pumps of pressure water reactors and continues to support the installed base of ARDs by offering field inspections, factory rebuilding and new ARDs with improved bearing performance.

Features

    Standard Formsprag ARD design features:

    • Lift-off sprags for no-contact running, no heat generation and long-life exceeding 10-year maintenance-free operation between recommended inspections
    • Dynamically balanced hydrodynamic babbitted bearings and races for minimal wear and heat generation
    • Accommodation for pressurized oil flow, and monitoring systems to measure temperature, pressure, and vibration to ensure performance
    • Balanced torque arm to positively prevent reverse rotation
    • 100% dynamically tested at the factory
    • ISO 9001:2000 and AS9100 Rev. B

    Other Formsprag Clutch Nuclear Power Industry applications include:

    • Backstops for various pumping systems
    • Cooling tower fan backstops
    • Overrunning clutches in turning gear drives