You may recall from Chapter 3 and the function development process called walking the dog that you’d be walking the dog again when developing failure modes. Let’s return to the fuel supply system boundary with a reminder that it has been overly simplified to suit the purposes of this book. In an actual analysis, you would gather far more detailed information about the components in the system and in the best of situations, would have fairly easy access to the actual hardware.

Figure 5-1 shows the fuel supply system boundary. In this figure, the dog’s path is depicted as a dashed line that begins at the input pump, follows the system up and through the tank, through valves and the filter, and finally through the output pump where it exits the boundary.

Figure 5-1: Fuel supply system dog walk

Begin again at the 1,000 GPM pump that receives kerosene from the upstream process. As previously mentioned, this diagram in its current state would be of little value in an actual analysis, but it does serve nicely to illustrate the concepts in this book. In order to illustrate the process of walking the dog to develop failure modes, assume that you have physical access to this system, which means the group can go outside and look at the pump, and you have photographs and other detailed technical information readily available to the review group.

For the purpose of this example, assume the 1,000 GPM pump at the beginning of the fuel supply system is exactly like the one depicted in Figure 5-2. To illustrate the process of failure modes and failure effects, the dog walk is restricted primarily to this pump. Bear in mind that the process used for this pump is identical to the process one would use for the remainder of the system.

Figure 5-2: Fuel supply pump

Tip from  Reliability Centered Maintenance: Unraveling the Mysteries by Jim Gehris

Keep reading... Show less

Upcoming Events

August 9 - August 11 2022

MaximoWorld 2022

View all Events
80% of newsletter subscribers report finding something used to improve their jobs on a regular basis.
Subscribers get exclusive content. Just released...MRO Best Practices Special Report - a $399 value!
 How To Achieve An Uptime Elements Black Belt

How To Achieve An Uptime Elements Black Belt

Do or do not – there is no try ~ Yoda

Are you one of those people who will not start a project until planning is close to perfect?

The Uptime Elements Black Belt program is designed


 Keep the Air Your Machine Breathes Clean and Dry

Keep the Air Your Machine Breathes Clean and Dry

It is important to stop airborne contaminants from entering tanks, drums, or machine reservoirs. The good news is that this is one of the easiest problems to address through high quality

Tip ...

 Optimizing Costs Through RCM-Based O&M

Optimizing Costs Through RCM-Based O&M

Today’s water and wastewater facilities must balance the demands of safety, environment and cost. With shrinking budgets, water and wastewater treatment facilities are asked to do more with

  • ...

How Complex Should Maintenance Procedures Be?

The level of complexity depends on several factors:

  • The complexity of the task. Tasks which have multiple steps that must be performed in specific sequence, or contain unusual operations, must be spelled out precisely.
  • What specific data is needed