Maintenance strategy
The maintenance strategy describes the management's approach to achieving the maintenance goals.
Maintenance goals can be, for example, maintaining a defined condition or extending the life expectancy of a property or a machine , taking into account a specified budget. Maintenance strategies can be divided into the following classes:
- damage-dependent maintenance strategy
- preventive maintenance strategies
- prospective maintenance strategy
Damage-dependent maintenance strategy
With a damage-dependent maintenance strategy (also failure-related maintenance strategy; English breakdown maintenance ), maintenance measures are only carried out when damage has already occurred to the maintenance object or the object has completely failed or has failed.
A failure of the maintenance object is consciously accepted with this maintenance strategy. There are no preventive maintenance measures - the primary focus is on repairing the damage.
This strategy can be used if there is no data available on the condition or wear behavior of the maintenance object.
A major disadvantage of the damage-dependent maintenance strategy is the unpredictable failure of the maintenance object. The downtime can be very long due to a possible lack of spare parts.
Preventive maintenance strategies
The aim of preventive maintenance strategies is to avoid or minimize failures through the implementation of planned, preventive maintenance measures to be carried out at specified intervals or according to prescribed criteria. Damage prevention is the focus of these maintenance strategies.
The advantages over damage-dependent maintenance strategies are the ability to plan maintenance measures and the resulting lower downtime.
The preventive maintenance strategies can be further differentiated.
Predetermined maintenance
In the case of predetermined maintenance (also time-based maintenance ), maintenance measures are carried out at regular intervals. One example is regular maintenance (e.g. oil change every 12 months).
The disadvantage of this strategy is that measures are carried out on the maintenance object regardless of its condition. This means that the stock of wear and tear is not exhausted.
Condition-based maintenance
In contrast to predetermined maintenance, with condition-based maintenance, the condition of the maintenance object is checked at regular intervals (e.g. by inspection) or permanently (e.g. condition monitoring ) and maintenance measures are only carried out when necessary.
For example, the condition of a machine can be checked through regular inspections (annually, monthly, weekly, etc.). If there are deviations from the target state, a repair measure (e.g. maintenance: oil change) can be specifically planned and carried out before a failure occurs.
The main disadvantage is the high cost of carrying out the inspections, especially in systems with a large number of maintenance objects.
Predictive maintenance strategy
The prospective maintenance strategy ( predictive maintenance ) of technical systems pursues the goal of avoiding failures and ensuring uninterrupted functionality through the implementation of planned maintenance measures. The planned maintenance measures are derived from the current qualitative condition (the actual wear reserve ) and a predicted wear history of the unit under consideration. The wear and tear can be predicted on the basis of negative influencing variables (so-called deterioration parameters ).
The planning basis for the maintenance measures is the implementation of a comparison of variants of potential maintenance measures, the consideration of a specified service life and the specification of a residual or minimum wear reserve .
Compared to the condition-based and the predictive maintenance strategy, the following additional conditions are taken into account within the prospective maintenance strategy:
- Determination of optimal maintenance times and measures from an economic point of view by comparing variants of the maintenance measures in the planning phase
- Option of cost-optimized agglomeration (bundling) of various component-related maintenance measures
- Specification of the service life of the maintenance object
- If necessary, specification of a minimum wear reserve for the maintenance object
- If necessary, specification of a residual wear reserve of the maintenance object.
Individual evidence
- ↑ DIN (Ed.): DIN EN 13306 - Terms of maintenance. Berlin: DIN German Institute for Standardization eV, 09-2001.
- ↑ Alejandro Alcalde Rasch: Success Potential Maintenance . Erich Schmidt Verlag, Berlin 2000, ISBN 3-503-05811-7 .
- ↑ a b c Uwe Schönfelder: Determination of the condition of real estate using the ERAB method - Basics for maintenance strategies. Werner Verlag, Dortmund 2012, ISBN 978-3-8041-5253-3 .