Category: Reliability Analysis
-
Warranty for haul trucks
You have a fleet of 60 haul trucks. You have been told by the OEM that they allocate 5% of the purchase price to cover repairs during the warranty period. The rationale for this is that the warranty is meant to cover infant mortality failures, with the purpose of indemnifying the owner against manufacturing defects…
-
Non-rejuvenating events
By definition a Non-Rejuvinating Event (NRE) is an action that systematically affects condition monitoring value levels, but does not add “life” to (i.e. reduce the physical age of) the asset. For example, if immediately after greasing the bearing, there is a significant step drop in detected vibration levels, then the greasing activity should be accounted for…
-
Defeating CBM
The following slide presentation on the importance of distinguishing failures from suspensions on work orders, refers to the Proportional Hazard Model (PHM) and the shape parameter β. The shape parameter is calculated from a good sample of condition monitoring and age data by using the EXAKT CBM optimizing system. EXAKT uses PHM by including CBM…
-
Failure declaration standards
A reliability engineer points out that in a mining operation hydraulic leaks in the fleet equipment are a major source of lost production. So during regular inspections the technicians are looking for leaks and if they find them they change the appropriate hose or component. However, it seems that they should be looking, not for…