Media library table - adjusting MTTF and predefining effects

In certain situations, there can be factors that influence the mean time to failure. For example, a pump transporting an aggressive fluid, using NBR as gasket material, may fail sooner than one containing water and a gasket material of EPDM. In these situations, the media library table can be used to adjust the initial mean time to failure (MTTF) based on the determinant values. The media library table is effective only during a Part merge operation (both the single Merge copy operation and during the Apply FM library templates operation). This way, the user can quickly build up an asset tree, making use of context information known about the asset parts.

The media library list is a list with combinations of factors that together can influence the MTTF value of a failure cause. Asset Strategy Optimization supports different factors to be defined, like a combination of media/gasket material. The combination of the two can be defined together with the effect (as a percentage of a reference combination) they will have on a default MTTF value. Refer to the example below.

Apart from the MTTF value, the media library list can define preset risk effect values that will be applied to the part’s failure behavior during the merge operation, based on the chosen combination.

In the example below, the determinant values would be a media/gasket material combination, where values such as ammonia/NBR and water/EPDM could be linked to a percentage of the common MTTF value filled in in the Library. The percentage would be applied as soon as the user merged a Library Part object to a part in the Asset tree, while looking at the determinant value in the Asset tree and applying the percentage to the MTTF value(s) set in the Library part structure. Note also that for the two defined Business Objectives (Safety and Quality), preset values are defined. These values are picked from the Library Business Objectives. The mechanism is shown in detail below.