Ball spin frequency and friction: centrifugal pump in chemical plant

pict1There is no benefit of having a wireless vibration sensor if it isn’t part of a network. They are several advantages to create a wireless network, such as reliability of data transmission, easy and cost effective system upgrading, movable sensors. Currently, creating a large network will always offer more possibilities to relay the data from one measurement point to the receiver. Basically, the bigger and the more dense the network is, the more reliable the data transmission. From the beginning of your vibration program, it is important to think about the wireless vibration network extension. The solution developed in the Wi-care system is based on a receiver connected on the internet and able to manage up to 144 transmitters, each transmitter sending vibration and temperature data. In order to reach long distance data transfer and remote locations, the Wi-care involves a range extender in its network.

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.

pdfRead Complet Case Study

 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 :

















 Analyst observations

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.

pdfRead Complet Case Study

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