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.

How to reduce oil carryover in refrigeration compressors

The majority of compressors used in refrigeration systems are oil-injected. Sometimes a compressor unit shows higher oil consumption than calculated.

Over the last five years we have investigated the most common causes of oil carryover. During our field investigations, we noted interesting findings related to oil carry over. We found that older compressor installations started to show more oil consumption than they had originally demonstrated.


BLISTERING damage and the shaft seal

The most common reason for shaft seal failure is blistering. Blisters form unexpectedly and degrade the surface of the seal face, causing irregularities in the  running area and resulting in poor performance -- higher leak rates and higher friction -- causing failure of the shaft seal.


Energy saving compressor units: Is a VSD compressor unit the best solution?

Can a Variable Speed Drive (VSD) compressor lower the operation cost or create higher costs in fields other than energy?

Reducing energy costs is becoming a top priority, so it's no wonder that VSD compressor units are increasing in popularity. There is a common belief that VSD compressors are the most efficient part-load rotary screw compressors. As much as I agree with the high quality of VSD compressors, I cannot stress more the importance of fine-tuning and adjusting the compressor unit to the field working conditions.