Aaron Hoeg

Recent posts by Aaron Hoeg

2 min read

What Are the Causes of Varnish in Hydraulic Oil?

By Aaron Hoeg on Wed, Nov. 07, 2012

The Problem of Varnish Contamination 

Varnish contamination is the inevitable byproduct of many degradation processes in hydraulic and lubrication systems. The effects of varnish on industrial and manufacturing systems range from the nuisance of minor downtime and routine maintenance to, worst case scenarios, multi-million dollar catastrophic failures of major capital equipment. 

Topics: contamination varnish SVR hydraulic turbine oil
8 min read

ISO 4406: What Do Those Numbers Mean in the ISO Cleanliness Codes?

By Aaron Hoeg on Mon, Oct. 08, 2012

Guest post today by Dan Helgerson. He is the Technical Editor of the Fluid Power Journal, where this article was originally published.

We have been talking a lot about filtration here at the steel mill. My predecessor had done a remarkable job in educating by example, demonstrating the need for good control of the fluids in our hydraulic and lubrication systems. He had helped stop the leaks and had added well-thought-out filtration systems that have resulted in substantial savings and increased productivity.

There is still a lot of work to be done and in pursuing that we have invited a number of vendors in, each offering an approach to getting and maintaining an acceptable fluid cleanliness level. The one thing that they all have brought to the table is a discussion of the ISO Cleanliness code. I was in a meeting with a group of managers when one vendor began to talk about the code. Being a Certified Fluid Power Accredited Instructor (AI), I immediately saw this as an obvious teaching moment, so I asked, “Does anyone here want to know what those numbers mean?” The answer was a quick and resounding, “No!”

Topics: iso cleanliness codes ISO 4406
4 min read

Glass or Cellulose Filter Media?

By Aaron Hoeg on Mon, Sep. 17, 2012

Glass or Cellulose: Which Hydraulic Filter Media is Best?

There are several distinct differences between glass and cellulose media. Media selection should be based on the required cleanliness and other unique needs of the system. Evaluate the Beta ratio (efficiency), dirt holding capacity, flow versus pressure drop characteristics, etc. A hydraulic filter supplier should be able to supply more detailed test information in addition to what is supplied in the literature.

Topics: hydraulic fluid ISO 16889 cellulose media filter elements filter comparison glass media
2 min read

Vacuum Dehydrator VUD: Real-World Results

By Aaron Hoeg on Mon, Sep. 10, 2012

Hy-Pro Vacuum Dehydrators Improve Mill Reliability

 We Hy-Pro Vacuum Dehydrators already know that maintaining low levels of water in rolling mill lubricating oil can help improve uptime, extend oil life, prevent bearing failures and increase profitability. But, what about an actual example of how a vacuum dehydrator has improved mill reliability?

Topics: vacuum dehydrator total systems cleanliness
2 min read

Oil Vacuum Dehydrators: Managing Water in Rolling Mill Lubricating Oil

By Aaron Hoeg on Fri, Aug. 31, 2012

In our last post, Improving Rolling Mill Oil with Vacuum Dehydration, we discussed how the demulsibility (ability of the oil to separate from water) of oil is an important characteristic that greatly influences the effectiveness of the lubricant and how a loss of demulsibility can result in poorly lubricated bearings, unplanned downtime and premature fluid replacement. 

Topics: hydraulic fluid contamination water Water Contamination rolling mill lubricating oil vacuum dehydrator VUD
2 min read

Improving Rolling Mill Lubricant Oil with Vacuum Dehydration

By Aaron Hoeg on Tue, Aug. 07, 2012

Benefits of Vacuum Dehydration for Rolling Mill Lubricant Oil

Steel mills typically use lubricants with high demulsibility for rolling mill back-up roller bearings and chocks since relatively high levels of water contaminate the oil from quenching and descaling processes. These rolling mill lubricant oils may be known as Morgoil as they are commonly used on Morgan rolling mill systems.

Topics: hydraulic fluid rolling mill lubricating oil vacuum dehydrator VUD
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