Enhanced API 670 Monitoring of Gearboxes - Use of SKF Acceleration Enveloping with SKF Multilog On-line System DMx

Many critical machines instrumented by API 670 class protection systems include monitoring of large gearboxes. One measurement of vibration used is that of broadband acceleration.

For many years, SKF has successfully used its patented implementation of the acceleration enveloping technique to provide an early detection of defects in both rolling element bearings and gears.

In addition, SKF has developed a new concept in vibration monitoring in the form of its SKF Multilog On-line System DMx. This system provides API 670 machine protection, and condition monitoring in a distributed, modular device that is intrinsically safe for hazardous area use.

The combination of acceleration enveloping and the SKF Multilog DMx device allows for enhanced monitoring of gearboxes within an API 670 system, offering earlier detection of developing problems
compared to the simple broadband acceleration method. This application note discusses the implementation.