Expert advice

Expert Advice is a column written by Martin Wierbosch, CEO of RM Support. Martin is well known for his expertise on the refrigeration compressors and out of box thinking.

He is passionate about his work and continually searches for better solutions. Follow Martin on LinkedIn and Twitter

This column is intended to help you to overcome the problems you face while dealing with refrigeration compressors.  If you would like to suggest the subject for the next column, let Martin know by sending him an email.

What is special about refrigeration oil?

I was once told by the CEO of an oil company that refrigeration oil represents only about 3 to 4 percent of total business. The market for refrigeration oil is indeed small, but very demanding in terms of technology and procedures. Users who overlook important oil-related issues often later face technical problems with their machines and possible production disruptions. Thus, oil manufacturers and sellers need to be aware of the refrigeration industry’s needs, and at the same time users need to know what to look for on the refrigeration oil market.


Improved oil analysis method for refrigeration compressors

The current, standard oil analysis method involves observing only the lubrication qualities of unused oil and then compares these results with a data sheet. The results are based on:

  • Water content
  • Particle counting
  • Viscosity at 40°C

The foundation of the alternative refrigeration oil

We pointed out in our latest expert advice that Shell is going to discontinue the production of the Clavus 68 and G 68. Shell sold the production lines to the German company Fuchs, which means that the Shell 68 and G 68 will no longer be available for distribution. Shell now recommends the Clavus S (2V) and Clavus AB (4V) oils as alternatives.


Saying good bye to the Shell Clavus 68 oil

Have you heard that Shell is reducing its selection of refrigeration oils and Shell Clavus 68 will be no longer available? In the past, Shell has offered eight types of refrigeration oils, but now the selection will be reduced to only three products.

Shell Clavus Oil S 68 was specifically designed to meet the demands of rotary screw compressors used in commercial ammonia refrigeration systems.


Investment in VSD compressor units

There are many versions of Variable Speed Drive (VSD) compressors on the market. Some seem similar, yet vary significantly in price.

A customer asked me recently, "Can you point out the differences between the price levels and explain how the extra investment brings extra value?"