Condition based maintenance (ConBM)
This is the most common type of maintenance.
The condition of a part of the polder system is determined after a certain time period by means of inspection. Repairs are executed when a beforehand-determined quality limit is being exceeded. Thistype of maintenance mostly leads to preventive maintenance. ConBM is chosen when the requirementsfor CBM and PBM (see below) are not being met and the system is examinable (the condition is measurable).
The inspection process is an important aspect of the ConBM strategy and comprises three steps:
1. observation the condition and reporting;
2. processing of observation data and conclude on condition (diagnosis);
3. decision whether and what maintenance is required and initiate maintenance.
Preventive based maintenance (PBM)
After a certain amount of use related units (e.g. design lifetime or operational hours) have gone by, the part of the system will be replaced or repaired. This type of maintenance is therefore preventive. This kind of maintenance is chosen when the risks that go together with failure are high compared to the costs of inspection and maintenance and the moment of loss of function is predictable. Maintenance is performed depending on the intensity of use.
Corrective based maintenance (CBM)
The main characteristic of CBM is that reparations only will be done after loose of function (failure) of apart of the system, which is thus corrective maintenance. This kind of maintenance is chosen when therisks that go together with failure are low relative to the costs of inspection and maintenance or whenalternatives to cover the function are available.
2. corrective maintenance, i.e. corrective based maintenance.
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