tailieunhanh - Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 27

Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 27 studies the combination of various methods of designing for reliability, availability, maintainability and safety, as well as the latest techniques in probability and possibility modelling, mathematical algorithmic modelling, evolutionary algorithmic modelling, symbolic logic modelling, artificial intelligence modelling, and object-oriented computer modelling, in a logically structured approach to determining the integrity of engineering design. . | Application Modelling of Reliability and Performance in Engineering Design 243 In any complex process plant there are literally thousands of different systems sub-systems assemblies and components which are all subject to failure and therefore require specific attention with respect to the integrity of their design design configuration as well as integration. To determine a logical starting point for any RAMS analysis a hierarchical approach is first adopted followed by identification of those items that are considered to be cost or process critical. Cost critical items are the relatively few systems items of which the engineering costs development operational maintenance and logistical support make up a significant portion of the total costs of the engineered installation. Process critical items are those systems items that are the primary contributors to the continuation of the mainstream production process. Determination of cost and process criticality should begin at the higher hierarchical levels of a systems breakdown structure SBS such as the plant facility level since the total plant is normally broken down into logical operations areas relating to the production process. Thus rather than simply starting a RAMS analysis at one end of the plant and progressing through to the other end focus is concentrated on specific areas based on their cost and process criticality. The Pareto principle is followed which implies that 20 of the plant s areas contribute to 80 of the total engineering cost. When determining process criticality the fundamental mainstream processes should first be identified based on the process flow and status changes of the process. All operations areas in which the process significantly changes and which are critical to the overall process flow must be included. The different critical processes are then compared to those operations areas identified as cost critical to identify the sections or buildings in the case of facilities that are

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