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.
16
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.

15
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.

14
december
2010

Why is an inspection important for reciprocating compressors?

There are many types of annual inspection.

Some maintenance staff only carry out the instructions of the compressor block manufacturer. We need to realise that the compressor block is just one part of a whole compressor unit. The manual instructions are only a guideline. Important user information fulfills the balanced maintenance plan. Effects like the start-stop cylus-part load or VSD drive can make a big difference in maintenance. It may not sound logical, but a compressor in 24-hour operation needs less maintenance than an installation that operates only 2000 hours a year with twice the number of stops and starts.

23
november
2010

Part load energy consumption of screw compressors

The capacity of most fixed-drive speed compressors is controlled by creating an internal leak in the compressor. The design is calculated on a working condition of roughly -35/+35°C.

Usually a compressor is designed to work at full load (100%) capacity. In reality, however, most compressors operate at part load capacity.

22
november
2010

Save on operational costs by using the right oil

The compressor is the heart of the refrigeration system. In order to sustain its efficiency and low operating costs, it must be properly lubricated. The lubricant in an ammonia compressor must provide protection against friction and wear, and also serve as a coolant.