Itt Manufacturing Enterprises, Inc.

Goulds Pumps, Incorporated

Jerome A Lorenc

Eugene P Sabini

Oakley Henyan

Kenneth Lee Hauenstein

Barry Erickson

A method and apparatus are provided for obtaining the rotational speed of a pump system or other suitable rotating equipment having a self-contained pump electrical equipment power supply. The method features, before being rectified, directing one phase of AC power through a zero crossing circuit that identifies an instant of time the AC voltage crosses from one polarity to the other polarity and triggers a square wave pulse for each instant time. In operation, the AC voltage is detected when it crosses from a negative polarity to a positive polarity, or vice versa. The method also includes steps for measuring the period of the square wave pulse and calculating the speed of the pump or other rotating equipment.

Speed indication for pump condition monitoring

An electrical power supply for powering electrical pump instrumentation and process control equipment associated with a pump having a rotating member. The power supply includes an electrical current generator driven by the rotating member of the pump, and a voltage regulator for regulating the output of the generator.

Self contained pump electrical equipment power supply

A system for determining whether a centrifugal pump assembly is degraded as operating outside of acceptable operating limits and includes a processor adapted by software to perform the steps of automatically characterizing the pump characteristics at a predetermined operating level and testing for degradation using the automatically acquired pump characteristics.

Centrifugal pump performance degradation detection

A method for determining whether a centrifugal pump is operating within its normal flow operating range includes the steps: of determining a motor torque/TDH relationship over a range of speeds for a minimum flow rate in order to obtain a minimum flow operating range for the centrifugal pump; determining a motor torque/TDH relationship over a range of speeds for a maximum flow rate in order to obtain a maximum flow operating range for the centrifugal pump; determining the actual operating motor torque and TDH of the centrifugal pump at a given operating point; and determining whether the actual operating motor torque and TDH of the centrifugal pump fall within the minimum flow and maximum flow operating ranges of the centrifugal pump.

Method for determining a centrifugal pump operating state without using traditional measurement sensors

A controller for controlling operating parameters associated with fluid flow, speed or pressure for a centrifugal pump for pumping fluid, wherein at least one sensor is coupled to the pump for generating a signal indicative of a sensed operating condition. The controller comprises a storage device for storing data indicative of at least one operating condition and a processor in communication with the sensor and operative to perform an algorithm utilizing the at least one sensor signal and the stored data indicative of the at least one operating condition to generate a control signal, wherein the control signal is indicative of a correction factor to be applied to the pump.

Apparatus and method for controlling a pump system

A method is provided of identifying a rotating bearing defect featuring the steps of measuring the vibration of the rotating bearing to obtain a waveform signal; filtering the waveform signal to remove unwanted signal frequencies; enveloping the filtered waveform signal to obtain an enveloped low frequency time waveform; and synchronizing the enveloped low frequency time waveform to the running speed of the rotating bearing in such a way to preserve the phase relationship between the tachometer pulse and bearing defect to obtain a time synchronized waveform. The method may include the step of measuring the rotational speed of the rotating bearing; and the step of measuring the rotational speed of the rotating bearing comprises measuring the rotational speed of the rotating bearing with a tachometer.

Bearing defect detection using time synchronous averaging (TSA) of an enveloped accelerometer signal

A method for determining whether a centrifugal pump is degraded as operating outside of acceptable operating limits and includes the steps of determining a motor torque/TDH relationship over a range of speeds for minimum and maximum flow rates and at least at two other intermediate flow rates, sensing and measuring at least another pump value selected from a differential pressure across the pump, a pump discharge pressure or pump flow, to provide an output pump value and comparing said value with said determined relationship values to provide an indication as to whether said pump has degraded.

A method for determining the suction pressure of a centrifugal pump including the steps of determining pump torque and pump discharge pressure at at least two different speeds, forming a first order wave curve as a straight line using said pump torque and pump discharge and determining suction pressure from the y axis intercept of said line.

Determining centrifugal pump suction conditions using non-traditional method

A method and system for determining pump cavitation is disclosed. In accordance with the principle of the invention, changes in dynamic fluid pressure within a pump are monitored and compared to a determined cavitation alarm pressure. The determined cavitation pressure is determined as a known percentage of a known non-cavitation pressure. Fluid cavitation is determined when the change in dynamic fluid pressure falls below the determined cavitation alarm pressure. In a further aspect of the invention, a remaining mechanical seal operational life can be determined by maintaining a total time of fluid cavitation and reducing the expected life by the known operational time of the pump and the time the pump is in cavitation.

Method and system for determining pump cavitation and estimating degradation in mechanical seals therefrom

A controller for controlling operating parameters associated with fluid flow, speed or pressure for a centrifugal pump for pumping fluid, wherein at least one sensor is coupled to the pump for generating a signal indicative of a sensed operating condition. The controller comprises a storage device for storing data indicative of at least one operating condition and a processor in communication with the sensor and operative to perform an algorithm utilizing the at least one sensor signal and the stored data indicative of the at least one operating condition to generate a control signal, wherein the control signal includes a correction factor between 0.1 and 1.0 that is applied to the pump controlling algorithm in order to prevent overcorrection.

An improved pump casing and process for measuring fluid flow through a centrifugal pump casing is disclosed wherein the static pressure of a fluid being pumped by said pump is measured at a first point in the pump discharge inlet area of the pump adjacent the flow arm of the pump and at a second point removed along the nozzle, the pressures are compared to a pre-determined flow constant of the casing.

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Seneca Falls, NY, United States of America

Jerome A Lorenc