Pump Wear Detection Using Motor Current and Shaft Torque
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Solution Overview
Problem
In hydraulic fracturing operations, detecting wear or failure in pumps, particularly valve and seat wear, is challenging due to high noise, vibration, and multiple pumps contributing to fluid pressure, leading to undetected failures that can cause system malfunction and equipment damage.
Innovation Solution
A pump monitoring system that includes sensors such as an ammeter and torque sensor connected to an electric motor and drive shaft, with a controller assessing performance by analyzing changes or variability in sensor data, allowing for identification of valve or seat wear without relying on pump output pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple pumps contribute to fluid flow and pressure in hydraulic fracturing operations, then the system can achieve high pressure to fracture formation, but pump wear and failures become difficult to detect due to system noise and vibration
Solution Approach 1:
The system segments the monitoring function by assigning individual sensors and controllers to each pump unit. Each pump is monitored independently through its own sensor-controller pair, allowing wear detection at the individual pump level rather than being masked by system-level measurements. This segmentation enables precise identification of which specific pump is experiencing wear while maintaining the overall system's high pressure capability.
2Reliability
If conservative preventative maintenance is performed by replacing pump components well ahead of useful life, then system reliability is improved, but maintenance inefficiency increases with excessive downtime and part costs
Solution Approach 1:
The system implements continuous feedback monitoring of pump performance parameters including vibration, temperature, and pressure. The controller receives real-time data from sensors and compares it against baseline values to detect deviations indicating wear. This feedback mechanism enables condition-based maintenance decisions, allowing operators to replace components only when actual wear thresholds are approached, rather than following fixed preventive schedules. This maintains system reliability while optimizing maintenance timing to avoid unnecessary replacements.
3Measurement precision
If pump components are monitored using traditional pressure-based methods, then system pressure can be tracked, but early wear detection is obscured by high noise and vibration in the frac fleet environment
Solution Approach 1:
The system introduces vibration sensors and temperature sensors as intermediary measurement devices that detect wear indicators before they manifest as pressure changes. These sensors act as intermediaries between the mechanical wear process and the control system, capturing subtle changes in vibration patterns and thermal characteristics that precede pressure drops. This multi-parameter monitoring approach provides more reliable early wear detection compared to pressure-based methods alone, enabling earlier intervention while maintaining accurate pressure tracking.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables early detection of pump wear or failure, reducing the need for conservative maintenance approaches and preventing system failures by identifying issues through patterns in current and torque variability, thereby improving operational efficiency and reducing downtime and costs.
Implementation Method 1
The sensor may include at least one of an ammeter in electrical communication with an electric motor driving a pump
Implementation Method 2
a torque sensor on a drive shaft that drives a pump
Data Source
AI summary
A pump monitoring system may include a sensor for monitoring a parameter of a pump system. The sensor may include at least one of an ammeter in electrical communication with an electric motor driving a pump and a torque sensor on a drive shaft that drives a pump. The system may also include a controller in data communication with the sensor to receive sensor data. The controller may be configured to assess the performance of the respective pump in one or more ways. At least one of the one or more ways may include reliance on the sensor data from only one sensor to identify valve or seat wear or failure. Alternatively or additionally, at least one of the one or more ways may identify valve or seat wear or failure without reliance on pump output pressure.