The current TRAM method has been designed using a “top down” approach using the actual stoppage data from the manufacturing unit. This approach does not supply detail on partial system failures, only on failures which have resulted in process downtime. This approach does not facilitate sub system analysis.
The latest software system has a recording medium entitled the “functional location” (FLOC) number which assigns a unique code to all plant equipment. This facility is not fully populated to date. The completion of the functional location data base will allow the construction of failure data sets relevant to machines or sub systems. These can be compiled to form a detailed higher level operating system. The adoption of this methodology will allow a “bottom up” approach to the system reliability analysis. The TRAM method will readily adapt to such an approach and will be able to perform a more robust reliability analysis in all cases.
A further benefit of this approach will be the identification of the sequencing and possible interdependency of failures. It was shown in chapter 7 that The Coilers operating parameters can exhibit trends in their failure rates. This reasoning can be
applied to their subsystems and could even identify failure trends in individual machines. This would be facilitated by focusing the reapplication of the TRAM method on the machine under investigation at weekly intervals until the failure root cause has been fully analysed and a robust remedial action implemented.
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