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  • Users: SewageSam
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  1. SewageSam

    Can a Constant Torque VFD on Variable Torque Motor (Centrifugal Pump) cause failure?

    We have a client 4 Vertical Turbine Pumps powered by the following motors: Emerson, BF66, Type-RUSI, Frame 404TP 460v, 3PH, 1785 RPM, 60HZ Class F Insulation, WP1 Motor Data Sheet Calls for VFD Load Type VT/PWM. The VFDs are Altivar 71s. Which from the model number states it is a Constant...
  2. SewageSam

    Using Pipe as a Weir

    How do you calculate the head over a pipe when used as a weir, and at what point does it not fucntion as a weir. Thanks.
  3. SewageSam

    Need to stop burping in contact chamber

    A wastewater treatment plant has a tertiary filter that discharges over an 8' weir at elevation 18', it falls 5' to elevation 13' (bottom of filter effluent chamber), goes through a 16" 90 deg bend mounted on the side of the chamber down to an opposite faced 90 then runs 20 feet to a contact...

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