CASE STUDY

Water Pumps

RESULTS WITH RDI

Company:

Location:

Alexandria, Egypt

Service Provider:

Nile Advanced Technology & Commerce - NATCOM

  • Reduced Time to a Solution
  • Proactive Reliability: Scheduling Repairs for Convenient Downtime
  • Problem Could Not Be Solved with Traditional Reliability Technologies

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PROBLEM

PROBLEM OVERVIEW

A customer had a pair of water pumps (East and West) driven by two pole motors that were continuously being reported on for misalignment based on “elevated 2X motor speed” in collected vibration data. Additionally, normally only one pump is run at a time, but vibration could be felt in the pump motor that was not running. This occurred in both motors, regardless of which pump was running. Several attempts were made to align both pumps, as well as evaluate possible flow related issues causing vibration in the non-running pump, but no efforts were able to fix the problems.

SOLUTION

SOLUTIONS THROUGH TECHNOLOGY

During a plant-wide Motion Amplification® scan, the customer asked to evaluate the two motors using the Motion Amplification® camera. The camera was able to clearly show both motors vibrating at what appeared to be 2X motor speed. A video showing both motors at the same time was made with the West motor running and the East motor off. In the video, both motors can be seen vibrating at similar amplitudes near 2X motor speed. The FFT function in the software was utilized and it became clear that the vibration was actually at 120 Hz (2X line frequency) and not 119 Hz (2X motor speed). This indicated that the issue was electrical in nature and not mechanical. There was not an alignment issue present after all. Additional inspection by electricians at the plant found a issue at the power feed for both motors. A wiring issue allowed electrical related vibration to occur in both pumps, even when they were not running.

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