Equipment Type
Compressor
Equipment Name
Water Ring Compressor
Faults
Rotor Unbalance
Early Detection of Water Ring Compressor Rotor Unbalance Fault
How AI Prevented Unplanned Downtime in a Chemical Plant
Chemical
Introduction
In chemical manufacturing, continuous operation is paramount for process stability and risk management. Unexpected equipment failure can result in production losses, compliance risks, and significant financial impact. This case study demonstrates how an AI-powered condition monitoring solution detected an early-stage rotor unbalance fault in a critical water ring compressor system—allowing maintenance teams to take timely action and avoid unplanned downtime.
Equipment Overview
A water ring compressor is a type of displacement vacuum pump based on the eccentric rotation of an impeller (rotor). As the impeller rotates, it drives water inside the pump body to form a tightly fitting water ring against the inner wall of the casing. A crescent-shaped working space is formed between the inner surface of the water ring, the impeller hub, and the side covers. The impeller's blades divide this space into several non-communicating chambers, which cyclically increase and decrease in volume to achieve the function of gas suction and discharge.
The Challenge
Preventing unplanned downtime in a chemical plant is difficult due to the high-consequence failure potential of critical assets. Any deviation in the mechanical condition of a compressor can directly affect process stability. Monitoring accuracy must be near-perfect to detect subtle mechanical faults like rotor unbalance, which can quickly escalate into costly failures, making a reliable, early-detection system a necessity.
Wisper Solution
Wisper CMS provided health status monitoring for the water ring compressor in the chemical plant, including a frequency exploration of the equipment. The system went online on December 24, 2024. After only two days of operation, the indicator score dropped to an "Available" state, identifying a rotor unbalance fault. The score continued to drop, prompting the system to issue diagnostic reports and warnings, alerting the site to monitor the equipment closely and take timely action. The customer ultimately performed maintenance based on the AI Equipment Guardian's report and their production schedule.
Timeline of Events
Dec 24, 2024 – System went online.
The outcome
Following the intervention (replacement of the motor), the equipment's abnormal indicator score returned to a healthy running state after the restart. The on-site inspection results were fully consistent with the diagnostic report, confirming the system's high level of accuracy and dependability. By identifying the issue in advance, Wisper CMS enabled proactive maintenance, reducing downtime risk and ensuring operational efficiency.
understanding the root cause
Rotor unbalance can arise from multiple factors, including:
Local damage or shedding of rotor components.
Non-uniform wear or scaling of the rotor.
Displacement of rotating parts caused by rotor deformation.
Low dynamic balance precision.
Manufacturing/assembly errors or loose fits within the rotor system.
