Reader Feeback

Small innovations can have big impacts An editorial and also an article in the April 2006 issue of PLANT ENGINEERING got me thinking about readily available innovations and why the rate at which some plants adopt innovation is too slow for comfort. Certain innovations are not totally new; they have been extremely well proven elsewhere.

06/01/2006


Small innovations can have big impacts

An editorial and also an article in the April 2006 issue of PLANT ENGINEERING got me thinking about readily available innovations and why the rate at which some plants adopt innovation is too slow for comfort. Certain innovations are not totally new; they have been extremely well proven elsewhere. Although small by themselves, it has been my experience that adopting some of these seemingly small innovations can quickly add up to huge savings.

There are common issues at work, and at least four facts or considerations keep surfacing in maintenance effectiveness audits:

  1. The assumption that equipment performance (and therefore, maintenance intervals) is forever linked to the initial design is fundamentally flawed. Such assumptions deny the findings that upgrading a single component (the weak link) is often possible with little or no incremental investment, and that such upgrading will often pay back more than a hundred-fold over the life of a machine.

  2. Benchmarking is necessary to understand where one stands compared to one’s best-of-class competition, but concrete action steps and component upgrades must be implemented to reduce maintenance frequencies and downtime. There can be huge gaps between benchmarking and the conscientious pursuit of tangible remedial steps.

  3. The root causes of unavailability must be found and explained in precise hardware, work process or procedural steps. Unless root causes are identified, organizations find themselves locked in a cycle of avoidable maintenance and/or repeat repairs.

  4. There is consensus among knowledgeable reliability professionals that the basics are less and less well understood. Realization that machinery and components obey the basic laws of physics is declining; the costly results are rather evident in elevated maintenance expenditures, asset unavailability, safety violations and ever-increasing frequency of costly litigation.

    1. So as to make the issues clear by example, this very brief article highlights three of many widely available -- yet sadly neglected -- opportunities to increase the availability and reliability of lubricated machinery in the United States. Many plants could, in the aggregate, save hundreds of millions of dollars each year by paying attention to the underlying facts and principles shown in just a few simple illustrations.

      In millions of pump bearing housings, certainly comprising the preponderance of total applications, we still find the pressure-unbalanced constant level lubricators. These tend to limit bearing life because:

      • The oil level in the lubricator base (“surge chamber”) is contacted by the ambient environment. In an industrial environment this ambient air contains dirt and water vapor.

      • The caulking that seals the bottle against the surge chamber has a finite life. After years of thermal cycling in an industrial outdoor environment, the caulking develops cracks and allows rainwater to enter.

      • According to Bernoulli’s Law, an increase in bearing housing pressure above ambient pressure will cause the oil level in the surge chamber to differ from the oil level in the bearing housing. While large housing vents might ensure bearing housings to be at ambient pressure, such vents would only allow more contaminants to enter.

        • A far more appropriate pressure-balanced constant level lubricator is available from the same manufacturers. At an incremental cost of often less than $30 compared to same-size pressure-unbalanced lubricators, the pressure-balanced models assure true level indication and reduced bearing failure risk.

          Oil ring (“slinger rings”) may have been around since the heydays of the industrial revolution, but they often expose users to the potential risk of

          1. Running “downhill” unless the entire shaft assembly is truly horizontal

          2. Making contact with the bearing housing interior, thus slowing down

          3. Lubricant contamination from wear debris (abrasion of these slinger rings)

          4. Operation at excessive shaft surface velocities, i.e. velocities that have been observed to cause slinger ring instability (“skipping around”)

          5. Slinger rings not being manufactured to within the needed concentricity tolerance

          6. Slinger rings having unacceptable (excessive) bore roughness

            1. Decades ago, leading equipment manufacturers recognized these risks and avoided them by using flinger disks in rolling element bearing housings. While flinger disks may cost a few dollars more than cheap slinger rings, they are an important and readily available upgrade “innovation” which often pays for itself in days!

              Some innovations can be very readily implemented and their value has been amply documented in the literature. Chasing after the elusive big dollar item may be far less productive than becoming familiar with the many available small innovations. Maintenance avoidance through upgrading makes much economic sense.

              Heinz P. Bloch, P.E.

              Process Machinery Consulting

              West Des Moines, IA

              hpbloch@mchsi.com

              Spanning the globe at Plant Engineering

              I recently just stumbled on your April publication of PLANT ENGINEERING , and I was fascinated by the content. I work for an engineering contracting firm for a Chevron cooperative here in Nigeria as a maintenance employee. Recently there has been more emphasis on proper asset management and operational excellence and the write-ups in your publication were of such great value to me, that I would wish to subscribe to your publication.

              Accordingly, can your guide me on how I can subscribe to be able to get this magazine on a regular basis and if possible past editions from January till April 2006.

              Dr. Edward S. Popko

              IBM Corp.

              Poughkeepsie, NY

              popko@us.ibm.com

              Solid feedback on solid state article

              I found Wendell Rice’s short article on “Solid-state circuits still create a buzz” in PLANT ENGINEERING just great. It is hard to find clear writing on technical subjects and Rice did a great job on a subject that still mystifies many people.

              I hope you continue these short pieces. They are very helpful.

              Ufoh Fidelis





No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
2016 Product of the Year; Diagnose bearing failures; Asset performance management; Testing dust collector performance measures
Safety for 18 years, warehouse maintenance tips, Ethernet and the IIoT, GAMS 2016 recap
2016 Engineering Leaders Under 40; Future vision: Where is manufacturing headed?; Electrical distribution, redefined
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Safety at every angle, Big Data's impact on operations, bridging the skills gap
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Applying network redundancy; Overcoming loop tuning challenges; PID control and networks
Driving motor efficiency; Preventing arc flash in mission critical facilities; Integrating alternative power and existing electrical systems
Package boilers; Natural gas infrared heating; Thermal treasure; Standby generation; Natural gas supports green efforts

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role of plant safety and offers advice on best practices.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me