The following case study describes and explains a typical remote analysis detection of a ball spin frequency and friction on a centrifugal pump in chemical plant. The continuous surveillance was set up in a very effective way for the customer and analyst:
For the Customer: Efficient detection, fast diagnosis and monitoring with very few upfront investment and performant analysis.
For the analyst: Continuous data, instant trend data and 24/7 protection, comfort of data collection, easy monitoring of corrective action
Equipment, plant overview, Context
The Chemical site is a huge chemical complex in East Asia operating 24 Hours 7 days a week with a constant growing production. The Equipment in question is a Centrifugal pump. Linked to several previous failures, customer wants to monitor the equipment for troubleshooting. Wi-care was installed on the pump bearing housing. Wi-care offers the opportunity to permanently monitor the pump without huge investment. Analyst discover from the early diagnosis a ball spin fault frequency and friction. The long term monitoring will help to identify root causes.
Analyst diagnosis and spectrum justification: Ball spin frequency and friction
Wi-care data from July 2014.
Measurement Wi-care location Motor PCV :
We detect a frequency at 0,4XRPM (1776RPM) on the pump bearing coupling side. This frequency indicates a BSF rolling element frequency. The amplitude at 1,4 G peak and the associated spectrum noise indicate a friction inside the bearing.
The amplitude justifies verification. We recommend verifying simply the correct grease lubrication of the bearings within 10 days and to perform a complete vibration of the motor and pump within a month. Following greasing and full vibration measurement, other actions may be taken.
We detect no serious imbalance or misalignment on the pump. No severe cavitation.