When the economic pressure escalate we often fall back to a re-active unplanned maintenance approach, which generally increase the costs by at least 30%. It is however possible to evolve the same re-active approach into a planned financial advantageous and risk neutral platform by injecting objective decision-making
In order to achieve this do we need to establish the following questions that relates to the LOS(level of service) expectations
- Function and performance standards
- Functional failures
- Failure modes
- Failure effects
- Failure consequences
With this information can we answer the following questions:
- Is the risk profile significant
- Is the preventative maintenance efficient to reduce the risk.
If both are NO, then
- The appropriate maintenance approach is a (CBM) condition based maintenance approach, which is a planned and predictive strategy rather than an unplanned re-active approach.Not only is this a risk appropriate strategy, but also a more cost-effective approach.
The illustration shows planned preventative maintenance approach (also called zero failure tolerance), which indicates the interventions along the decay curve. With a CBM strategy is interventions only scheduled when the performance/condition drops below a specific tolerance level.
With a Total Asset Management approach is the focus on an asset’s performance over its life cycle and on aggregate performance of asset groups, as well as the maintenance work order and maintenance performance for a defined period
Maintenance is defined as interventions, periodic and minor in nature, required to sustain performance and functionality of an asset consistent with design, manufacturer, and operational requirements
The goal is to develop a comprehensive asset management plan for each asset for the life of the asset that ties maintenance objectives to the value chain.
The objective is to evolve a maintenance techniques from traditional unplanned (reactive) maintenance to a Proactive approach with Preventive and Predictive capacities
The (PM) preventative approach endeavors to maximize the life expectancy and minimize the long-term marginal cost with an FCI rate below 5%. With this approach are cyclic maintenance and renewal events (85- 95%) scheduled to sustain the asset’s performance above the minimum tolerance level (95-99%).
A predictive approach is a subset of the PM approach that is item specific and fine tuned to optimize the cost platform.
Predictive strategies can include
- Run to failure(Redesign)
PMD offer Long-term maintenance planning solutions .
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