RCM Analysis - Maintenance Tasks (Step 4)

This aspect of the RCM analysis relates to question six (second part) of the seven RCM questions: What can be done to predict or prevent each failure? Note: This only relates to the maintenance tasks involved in the ‘do maintenance’ scenario. The economics in terms of MEI and the risk reduction (and residual risk) will be addressed later.

In the fourth of the 5 guides steps the Maintenance tasks need to be specified that lead to the most effective maintenance approach to reduce the probability of negative effects of the equipment failure.

Although tasks can be selected free, the selection of task should match the information held in the Failure Effects and the Strategy Decision Tree. These tasks typically come forward from four categories:

Note: The Condition Monitoring tasks and Condition Based tasks form typically logical combinations.

Since later there will be an economic comparison and justification between the ‘no maintenance scenario’ and the ‘do maintenance scenario’, all tasks for the ‘do maintenance scenario’ should be involved, including repair or overhaul of the Equipment and spare parts.

The effectiveness of the tasks is determined by the activities to be done and frequency involved. The reliability engineer and the maintenance craft needs to select an effective set of maintenance tasks, where the effectiveness of the maintenance tasks will later be translated into the ‘Estimated Time Between Consequences’.

Click + to select a Recommended Task:

Open the track-list to select a Task name.

In this example (with Actuator Failure on 1PC01) it was indicated (see Step 3) to apply a technical feasible, scheduled restoration or discard task. In this case a Scheduled Overhaul task is selected.

For each task a task Type and Frequency must be added.
There are 4 frequencies without interval specified:
ASN – as needed,
T/A – turnaround,
INV – investigation,
OB – opportunity based.

For economics calculation, you should add an Interval.

In this case, the Scheduled Overhaul is needed during T/A every 8 years. As a last overhaul was done in the T/A of 2014, the 8 year interval should start then. Note: The work-center (RWC): "INS" stands for instrumentation.

Regarding the Implementation System – this task should be registered in the "TA system". 

Additional task and activity information can be provided in the Description field.

Click Save and add POC.

POC relates to the ‘price of conformance’ which involves the costs of the maintenance task(s).
As in this case, the overhaul task is the reconditioning task, then for the POC values we can copy the data from the PONC screen (= Price Of Non Conformance – which involves the costs in the ‘no maintenance situation’). The comparison of the POC and the PONC will help to visualize some of the financial benefits of preventive maintenance.

In this example – after Copy from PONC is clicked, it is clear that as the task is executed in the TA there will be no 8 hrs downtime involved with the repair, where the other numbers will be quite the same.

Note:

1. There can be more than one preventive maintenance task involved, dependent on the way the Failure Mode develops and occurs.
2. Especially with condition monitoring tasks it would be wise to specify at which observation - actions needs to be taken (and what action). The description - and notes field on the task are available for such information.
3. The ‘implementation system’ can be different for various users, although it will be clear that there will be multiple end users involved – who might have their own system to register tasks for execution.

Click Save when you are done defining the Task and its POC.

To add a new Task (if the desired Task is not available in the track-list) click +:

For a new Task, you need to specify a Task description and Type:

When you have defined all the the Recommended Tasks, click Next to finish Step 4 of the guided steps.

Instruction video

For more information on the execution of RCM analysis in Guides Steps see instruction video: RCM Analysis Guided Steps Episode 7 Video.