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by Fred Schenkelberg Leave a Comment

The Basics of Planned and Deferred Maintenance

The Basics of Planned and Deferred Maintenance

We can plan to do more than we are capable of accomplishing. The remaining items, if they warranty accomplishing become deferred. They roll over to the next’s day’s list of actions to take.

Of course, in practice, the process to plan, execute, and defer maintenance activities is a bit more complex than described above. The ability to maintain equipment in working order along with minimizing downtime and costs is in large part the balance between resources available to conduct maintenance and the increased risk of system failure due to deferred maintenance. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Maintenance Strategies

by Fred Schenkelberg Leave a Comment

Implementing the Right Preventative Action

Implementing the Right Preventative Action

There are two instances when you should implement preventative action. First, once a failure occurs and you would like to avoid similar future failures. Second, before a failure occurs, yet an undesired failure mechanism is likely to occur.

Like corrective action there is a wide range of possible preventative actions. The selection of the right actions requires considering customer expectations, business and legal factors, along with the technical and economic feasibility. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Preventive Maintenance (PM) Analysis

by Fred Schenkelberg 4 Comments

Preventive Maintenance Goals and Activities

Preventive Maintenance Goals and Activities

Preventive Maintenance or PM is a set of inspections and tasks that help prevent equipment from failing. Keeping equipment operating improves plant capacity and throughput. Avoiding unwanted downtime helps the plant avoid unnecessary expenses and lost productivity.

Checking the oil level in your car’s engine and adding more as needed, along with regular oil changes are examples of PMs. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Preventive Maintenance (PM) Analysis

by Fred Schenkelberg Leave a Comment

Optimizing Maintenance

Optimizing Maintenance

One of the considerations when planning maintenance is the timing of the replacement of parts of the system. In some cases it makes sense to wait for the item to fail, sometimes, it makes sense to place it on an interval or set an amount of operating time, and yet in others, we can measure indicators that a replacement is necessary.

In order to make these decisions, we need data.

According to O’Connor and Kleyner (Practical Reliability Engineering, 5th Ed.), we need specific information for each part. The following list outlines the recommended information. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Preventive Maintenance (PM) Analysis

by Fred Schenkelberg 2 Comments

4 Electronics Nondestructive Evaluations

4 Electronics Nondestructive Evaluations

It is possible to use the circuit design or the circuit itself to evaluate electronics. This ranges from checking if the system is wired correctly (the right parts are present and attached properly) to a complex evaluation including the proper functioning of firmware and attached software.

Beyond visual inspection, we need a way to evaluate the microscopic structures with today’s electronic components.

The ability to provide inputs and measure outputs provides one view and in most cases is nondestructive. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Non-destructive evaluation

by Fred Schenkelberg 3 Comments

8 Nondestructive Evaluation Techniques

8 Nondestructive Evaluation Techniques

There are times when we need to evaluate a product to determine is it assembled correctly or when looking for clues concerning a failure mechanism. Simple visual inspection may be sufficient and there are times when we need more information or detail.

A great first step is the use of an appropriate nondestructive evaluation (NDE) method.

Done correctly, we keep the item unchanged and available for shipment or further inspection.

[Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Non-destructive evaluation

by Fred Schenkelberg 5 Comments

8 Factors of Design for Maintainability

8 Factors of Design for Maintainability

The first time I changed the oil filter of my car (first car in high school) I smashed my knuckles against a grimy block of metal. More than once. It may have been my lack of experience or improper tools. Or, it may have been a rather poor design.

Watching the Indy 500, especially the pit stops, I quickly realized there has to be something different about those cars that lets them change tires, add oil & fuel, and clean the windshield in less time than it took me to get under the hood and find the oil filter. The cars were designed differently and that is what permitted the difference in service time.

In order to increase availability and minimize the cost of maintenance, we have to deliberately design the system to accommodate the needs of maintenance. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Design for X (DFX), Management strategies

by Fred Schenkelberg 2 Comments

Corrective Action Question

Corrective Action Question

When this posts I should be near 17k ft altitude without electricity or internet – hoping for the best. So, this post and the next couple are homework for you. Take a look, work the problem, solve it, then show your work. Comment with why you choose your response and why you didn’t select one of the others.

Here is question 18 from the ASQ CRE 2009 sample exam. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Corrective Maintenance Analysis, cre prep

by Fred Schenkelberg Leave a Comment

Fault Isolation

Fault Isolation

I’m about to leave for Nepal for a month and much of it without internet. So, this post and the next couple are homework for you. Take a look, work the problem, solve it, then show your work. Comment with why you chose your response and why you didn’t select one of the others.

This is question 17 from the ASQ CRE 2009 sample exam. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: Corrective Maintenance Analysis

by Fred Schenkelberg 1 Comment

Reliability Centered Maintenance

Reliability Centered Maintenance

The document by Nowlan and Heap

Part of keeping equipment operational is affecting repairs appropriately. Sometimes it makes sense to replace an element of some equipment before it fails, i.e. automobile tires as the tread wears. Sometimes is doesn’t make sense to repair a functioning unit as the result would be a system that is less reliable then before. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Maintainability and Availability Tagged With: failure mechanisms, maintenance, Maintenance Strategies, RCM

by Fred Schenkelberg 5 Comments

M and A Sample Questions

M and A Sample Questions

Just a couple of sample questions from deep in the body of knowledge this week.

Which of the following can be evaluated with dye penetrant methods? [Read more…]

Filed Under: Articles, CRE Preparation Notes, Data Collection and Use, Maintainability and Availability Tagged With: FRACAS, Preventive Maintenance (PM) Analysis

by Fred Schenkelberg Leave a Comment

EAM & CMMS Systems, 10 times more data in the system or 10 time less done with the data available?

EAM & CMMS Systems, 10 times more data in the system or 10 time less done with the data available?

10 times more data in the system or 10 time less done with the data available?

EAM & CMMS Systems, 10 times more data in the system or 10 time less done with the data available?.

A nice short article about the problem of data, data, too much data.

Filed Under: Articles, CRE Preparation Notes, Data Collection and Use, Maintainability and Availability Tagged With: Data Management

by Fred Schenkelberg 2 Comments

CRE Primer Error

CRE Primer Error

Update:

I forwarded the note below to QCI for comment and asked if they have an errata available. They do.

The QCI errata is posted on [the] website. [Read more…]

Filed Under: Articles, CRE Prep, CRE Preparation Notes, Maintainability and Availability Tagged With: CRE

CRE Preparation Notes

Article by Fred Schenkelberg

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