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.

23 December 2010

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.

14 December 2010

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?"

14 December 2010

Introducing the Coldores® diamond shaft seal

Over the last four years, RM Support has examined over 100 broken shaft seals. The majority of them were damaged by thermal or chemical attack as a result of overheating. Read about this research here. 

The lifespan of a shaft seal is also much shorter now than in years past. In the 1980s and early 90s a mechanical shaft seal could serve from five up to ten years. Today, they last only one year. Keep in mind that the design of a shaft seal did not change at all over that time.

14 December 2010

Shaft seal failure: what is damaged? - Results of four years of research

The purpose of a mechanical seal is to prevent refrigerant leakage by sealing with oil. But all seals leak oil to some controlled degree.

Seal failure means that leakage is extreme & uncontrollable. The shaft seal is broken and needs replacement. Over the last 4 years, RM Support has examined 110 broken shaft seals of diverse brands of compressors.