How to Use Power Sensors to Improve Pump Efficiency

Effective supervision of pump system functioning primarily depends on using cutting-edge sensors and monitoring devices that aid in collecting critical operational data. Organizations may enhance their equipment's efficiency by using these solutions with analytics software and predictive maintenance procedures.

One major area for development is effective pump motor management, particularly in terms of energy usage. Many large and medium-duty electric motors with output capacities ranging from 1 to 100 HP typically do not produce the highest efficiency level. As a result, efficiency will be lost, and the cost of power will rise, making it less cost-effective.

Studies indicate that over 70% of pump motors are oversized by at least 20% for the equipment they power. Utilizing motor power sensors and more precise control systems presents significant opportunities for energy savings. In this article, let’s learn how to use power sensors to improve pump efficiency. 

Monitoring energy consumption

You gain insights into crucial performance metrics during pump motor operation by using motor power sensors. This data allows you to assess the efficiency of your pump motor and pinpoint areas where efficiency may be compromised. For instance, the motor might be exerting unnecessary effort in some scenarios or failing to deliver adequate power in others, resulting in inefficient pump operation and potential issues.

Utilizing motor sensors and monitoring technology provides real-time data that can be analyzed to identify energy efficiency losses. This information helps in optimizing equipment settings for enhanced efficiency and implementing advanced control systems for precise system management. Variable frequency drive (VFD) systems are increasingly popular due to their ability to adjust dynamically, offering improved control and adaptability to changing conditions.

Predictive maintenance

Adopting a predictive maintenance approach can further enhance the performance of pump motor sensors and other monitoring devices. This strategy leverages advanced control, monitoring, and analytics technology to proactively detect issues. Instead of relying on artificial intelligence programmes, this model emphasizes data collection and analysis to detect subtle changes in conditions. By identifying potential problems early on, maintenance planning can be optimized to ensure equipment longevity and maximize overall operating efficiency.

Protecting Your Pump System

Ensuring the proper functioning of your pump system begins with equipping it with the necessary sensors to monitor critical pump functions. If these monitoring devices were not initially included during the pump installation, they can be added without extensive upgrades.

Centrifugal pumps operate within specified performance windows known as operating curves. Deviating from these curves or experiencing excessive fluctuations within them can induce stresses that may damage the pump. Installing appropriate sensors, particularly on pumps with higher costs in terms of the equipment itself, energy usage, and maintenance, can help detect issues before they escalate and affect operational resources.

For instance, installing a pressure sensor on the suction side to measure the net positive suction head (NPSHa) can indicate if the pump is operating within the optimal performance curves. Monitoring temperature or pump vibration with sensors can highlight mechanical problems early on. Additionally, employing an empty pipe detection (EPD) or low/no flow sensor can alert pump malfunctions.

A pump protection system that doesn't require new wiring can utilize a self-powered wireless HART adaptor in conjunction with low-cost HART pressure and temperature transmitters/sensors, along with flow meters. This system provides essential pump condition information, including suction and discharge pressures and temperatures, to a recorder, data server, or web portal on a temporary or permanent basis. The pressure differential across the pump is determined by the disparity between measured suction and discharge pressures.

Preventing Pump Cavitation and Monitoring Suction Head

To prevent cavitation, the net positive suction head available (NPSHa) must exceed or equal the net positive suction head required (NPSHr). Monitoring the suction head, expressed in terms of water column pressure, helps identify potential issues that could harm the pump. Various factors, such as changes in flow rate or adjustments to head pressure from fluid density or tank level changes, can influence NPSHr.

Certain applications may encounter high-pressure or vacuum conditions, which can affect pump performance. Ceramic pressure sensors capable of measuring abrupt pressure changes without damage are suitable for such scenarios. These sensors can also withstand physical abuse without affecting calibration, making them reliable across different pump installations.

Determining When to Replace a Pump Motor

Utilizing pump motor sensors can aid in effectively managing your motor. Data analysis facilitated by these sensors may reveal that the current motor is not ideal for the pump equipment it operates. Reasons for this mismatch could include the motor being too large or too small, or its performance falling short due to factors like age, wear, or control settings.

Sensor monitoring offers valuable insights that can help assess whether it's necessary to replace the pump motor with a more efficient or suitable alternative for your specific equipment. You might find it necessary to replace a worn-out drive system, or investing in a better-performing motor could be deemed worthwhile for your pump system.

Evaluating the potential cost savings over time, including benefits such as improved energy efficiency, reduced equipment wear, and enhanced processing performance, can significantly influence your decision. This data-driven approach can simplify the decision-making process by providing clear evidence of the benefits associated with motor replacement.

Monitoring Seal Pot Levels for Pumping Systems

In applications involving toxic, hazardous, or corrosive fluids, preventing leaks into the environment is paramount. To achieve this, pumps often employ double or tandem seals, which utilize a compatible liquid injected into a sealed chamber to act as a barrier fluid.

Should any hazardous substance breach the inner seal, it will do so with the barrier fluid in the seal chamber, potentially leading to complete seal failure and the release of undesirable products into the environment if not properly controlled and maintained.

Seal pots, acting as reservoirs of clean, pressurized barrier fluid, play a crucial role in these systems. Loss of fluid from these pots can result in seal failure and hazardous conditions. Therefore, operators need to monitor fluid levels to detect any potential issues.

Seal pots typically feature high-level or low-level liquid switches, or both, depending on the application. A low-level switch indicates a loss of barrier fluid, while a high-level switch signals hazardous product leakage into the seal chamber, elevating the seal pot level. Outputs from these switches connect to alarms or the plant control system, prompting immediate corrective action.

Enhancing Pump Safety with Pressure Sensors and Proper Design

Additionally, all seals incorporate pressure sensors, with some systems employing pressure switches to activate alarms or shut down the pump for added safety.

Proper piping, valves, and pump design can mitigate conditions that accelerate pump damage or failure. For instance, incorporating automatic flow control devices or recirculation lines between the pump's discharge and source lines ensures adequate flow to prevent overheating or damage.

However, if piping design alone cannot guarantee operation within pump specifications, instrument-based monitoring becomes necessary. In practical scenarios, precise pump sizing and piping design may not always occur initially, and changing operating conditions can invalidate initial calculations.

Efficient Pump Monitoring Through Thermodynamic Analysis

A widely recognised method for assessing pump efficiency without the need for flow measurement is the thermodynamic system. This method follows the guidelines outlined in ISO 5198 –1987 and the Code of Practice for Pump Efficiency Testing by the Direct Thermodynamic Method, established by The Pump Centre, U.K.

The process involves installing highly accurate temperature probes and pressure transducers on both the suction and delivery sides of the pump. These sensors measure the differential water temperature and pressure, allowing for the calculation of energy loss due to pump inefficiency. Notably, neither the flow rate nor the power absorbed by the pump need to be directly measured.

When the shaft power is absorbed by the pump, the flow rate can be estimated using the absorbed power, differential head, and measured efficiency. This calculation is suitable for fluids with well-defined properties, such as water.

Given the significant energy consumption and cost associated with pumps, which are essential and expensive systems, integrating sensors into pump systems can enhance efficiency and enable early detection of potential issues before they escalate.

Conclusion 

For expert assistance with managing your pump systems and implementing cutting-edge monitoring, control, and predictive maintenance technology, reach out to the team at AYTC. Our professionals are equipped to optimize your pump system for maximum efficiency and performance. As an authorized full-service distributor of Corken products, Ali Yaqoob Trading offers a range of vertical and horizontal reciprocating compressors tailored to the exacting standards of the LPG industry. Our compressor models, available in plain, D-Style, or T-Style configurations, cater to diverse leakage requirements. Should our standard mounting options fall short of your specifications, we can engineer custom industrial compressor packages to suit your unique needs.