Posted by Ralf Weiser on Mon, Dec 14, 2009 @ 12:30 PM
This is directed to anyone who owns and operates any plant in any given industry. I am in awe. This is the year 2009 where saving money is more important than ever and yet unplanned emergency repairs costs due to run-to-failure as well as the dated run time based maintenance drain your manpower and cash reserves more than ever. Do not get me wrong, there are pre-existing conditions that you sometimes cannot prevent, or your organization has done it for so long that the cultural change will take years for you to change.
Ideally, anyone in charge of maintaining equipment - especially the ones of you who responsible for the budgeting - should sit on a rock and ponder how your organization can implement what I call Precision Maintenance philosophy. No rocket science or big costs involved here. It just describes the process of setting up trending your assets precisely. The precise part is divided into three similarly important yet mind boggling simple steps: Plan - Do - Review.
In the planning phase is the toughest part. You prioritize which items are the most important to trend. Do not be shy to start monitoring machines that seem to have low capital cost. You will be surprised how much low cost machinery really cost you when you review the total costs of ownership (i.e. energy, failure history, etc.) . Reliable trending is best done with vibration analysis, oil analysis, Infra Red imaging, power consumption, load, pressure and many more. There is awesome instrumentation out there that does not cost much to buy is easy to install and integrate into your plant operating system. If real time monitoring cannot be done, you will need trained manpower that will walk scheduled routes and record the data for you. If necessary, pull in your OEM (Original Equipment Manufacturers) to help establish alarm and shut down values for any of the parameters that you are recording.
The Doing part comes easiest to most of us. With an increasing trend of troublesome data the machines that seem in need of attention have to be pulled, evaluated and eventually repaired. Make sure to record any abnormalities in the tear down and inspection reports and compare them with the machinery trends. Ask yourself if the failure symptoms are linked to the trend information, for instance defective bearings and an increase of vibration.
The most forgotten part is the review phase of any of your activities. Immediately upon repairing or even installing a new machine you need to take a set of data - did you really address the root cause of a problem or merely a symptom of it? If it is the former, you can go about your daily business. If it is the latter, your job is not done yet. Now is the time to tenaciously finding the reason what is causing the abnormal values.
With Precision Maintenance you can easily save tenths of thousands of Dollars every year. Make sure you make good use of that knowledge in the ROI (Return Of Investment) calculation - the more instrumentation you can afford the better. For blowers and compressors there are many standardized platforms we could help you with. As always, I am looking for your feedback.
Ralf Weiser - Technical Manager
Aerzen USA
rweiser@aerzenusa.com
Listen to Ralf Weiser's Podcast on Expert Level Maintenance
Posted by Ralf Weiser on Mon, Dec 07, 2009 @ 08:18 AM
Do you believe in everything you see and hear about Turbo Blowers?
That is a loaded question. Especially here in North America we tend to be drawn to the "New" and the "Better" like a moth to a light unlike any other society that I know. In the last couple of years there has been an increasing amount of incredible power saving claims by single shaft turbo blower and compressor companies in comparison to positive displacement machines such as our own GM and VM Generation 5 Delta Blower and Delta Screw series. When you look behind any claim, is there not usually the typical "it depends" clause that must be considered? Typically this takes time and effort and thus it is no surprise that only few people give this further consideration.
We felt like we should put the different technologies and compare it in a realistic context and compared the different primary air moving technologies. You can down load the white paper from our web site and learn about the pro's and con's of the different machine types. You will be positively surprised about the depth and volume of information that the author Pierre Noack compiled for you. I truly believe in one thing: Nothing is either universally bad or good - with very rare exceptions and those usually involve two legged ones.
Ralf Weiser
rweiser@aerzenusa.com
Posted by Ralf Weiser on Tue, Dec 01, 2009 @ 12:07 PM
What not to forget when you correct rotating equipment problems...
You've just finished repairing a machine for the umpteenth time and you are exhausted because it could not be done in a single shift. A couple of months later you find yourself doing this again. Does this sound familiar to you? Do not be afraid to admit it, this is a rampant problem at many different companies and settings.
It was not until about a decade ago when I finally realized the step we usually forget about in this process: Immediate and continuous review if anything we labored implementing really addressed a root cause or a mere symptom. It sounds so easy and yet is so often either not done at all or not done in frequency and depth.
There is a really basic principle I recommend for the root cause failure finding and subsequent remedying process. First start to ask why the problem exists. For every item you ask again why that particular issue could have caused the problem. You do this for a total of five times. By that time I can all but guarantee that you have found the real issue. Devise a corrective action implementation plan and carry it out.
Now comes the most important part: Make absolutely sure that you carry out tests such as - but not limited to vibration analysis, oil analysis, infrared thermography, current draw, and so many others. It would of course be best if you had baseline and perhaps even a history of data to compare with. If the problem you started out with presents itself in the new review data you can at least preemptively start with corrective action again - without having to go through yet another repeat disaster. This process also works in other plant and process settings, but that is for another Blog session. Do you have any questions or comments? Please feel free to drop me an email.
Ralf Weiser - Technical Manager
rweiser@aerzenusa.com
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