Patent ID: 8177520
Filing Date: 2012-05-15
Classification: F04D

Abstract:
1. A method of detecting a possible entrapment event in a jetted-fluid system comprising a vessel for holding a fluid, a drain, a return, and a pumping apparatus coupled to the drain and the return, the pumping apparatus comprising a pump comprising an inlet coupled to the drain and an outlet coupled to the return, and a motor coupled to the pump to operate the pump, the method comprising: during a normal operation state, powering the motor, pumping the fluid with the pumping apparatus during the powering of the motor, the pumping act comprising suctioning the fluid from the vessel through the drain and jetting the pumped fluid into the vessel through the return, monitoring the drain for the possible entrapment event, the monitoring act comprising initiating a fault state when the calculated input power is indicative of the possible entrapment event; and during the fault state,