Risk Evaluation Matrix for Process System Maintenance Prioritization
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Solution Overview
Problem
Current risk evaluation techniques in process systems struggle to establish relevance between processes and constituent devices, making it difficult to determine which devices require priority maintenance.
Innovation Solution
A risk evaluation system that calculates and displays device risk evaluation matrices using importance and trouble occurrence frequency, allowing for identifiable plotting of specific constituent devices within a process, enabling clearer maintenance prioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If risk evaluation is performed in the unit of process only, then risk evaluation can be implemented for the entire process system, but it becomes difficult to grasp relevance between process and constituent devices and determine priority maintenance targets
Solution Approach 1:
The patent segments the risk evaluation into two levels: process-level evaluation and device-level evaluation. The process risk evaluation matrix displays overall process risks, while the device risk evaluation matrix breaks down risks by individual constituent devices. This segmentation allows maintaining process-level overview while simultaneously providing device-level detail to establish relevance and determine maintenance priorities.
Solution Approach 2:
The patent implements a nested structure where device risk evaluation matrices are embedded within process risk evaluation frameworks. Each process contains multiple constituent devices, and the device-level evaluation is nested within the corresponding process context. This nesting preserves the hierarchical relationship between processes and devices, enabling traceability from process risks to specific device risks.
2Loss of information
If detailed device-level risk evaluation is performed for all constituent devices, then relevance between process and devices can be grasped, but the complexity of risk evaluation system increases
Solution Approach 1:
The patent divides the evaluation system into separate but linked components: process risk evaluation and device risk evaluation. Each operates with its own matrix and criteria but references the other through identification relationships. This segmentation reduces complexity by allowing each subsystem to be developed and maintained independently while preserving their relationships.
Solution Approach 2:
The patent introduces an identification information mechanism as an intermediary that links process-level and device-level evaluations. Identification information for constituent devices is stored in association with both process and device data, serving as a mediator that enables correlation without requiring direct integration of the entire evaluation systems. This intermediary simplifies the connection between hierarchical levels.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5A
AI summary
A risk evaluation system includes a storage unit, an operation unit, a calculation unit, a risk evaluation unit and a display unit. The calculation unit calculates first and second factors for use in risk evaluation relating to specific constituent devices on the basis of predetermined information about the specific constituent devices. The risk evaluation unit generates risk evaluation information to be used for displaying a device risk evaluation matrix defined by two axes of the first factor and the second factor and including plot images plotted based on the first and second factors of the specific constituent devices. Further, the risk evaluation unit generates the device risk evaluation information in identifiable displaying mode to allow identification of plot images of specific constituent devices constituting a same process.