TESTING INSTRUMENTED LOGIC SYSTEMS

摘要

BACKGROUND:rnSome of the distinctive characteristics when developing testing procedures for Instrumented LogicrnSystems are:rna) There are different types of procedures depending on the logic system or process equipment conditions and logic complexity.rnb) Writing and maintaining testing procedures can be a resource intensive activity, especially when it responds to corporate, external agencies or code requirements when several documents need to be developed and kept up-to-date throughout the lifecycle of the system.rnc) Although some Instrumented Logic Systems improve operations efficiency, many others like Burner Management, Purge Cycles, Protective and Safety Shutdown Systems, etc. provide the last layer of protection preventing a major safety, environmental, or economical loss incident.rnTesting is the primary activity to ensure that these critical systems perform as specified when demanded by process conditions.rnPRESENTATION:rnThis paper presents an overview of the different types of testing procedures implemented to validaterninstrumented logic systems grouped in two main categories: Commissioning and Maintenance.rnThe description of each type of procedure covers aspects like equipment conditions, sourcerndocumentation and test strategies.rnThe overview concludes with some common elements associated to procedures such as format,rnresults analysis and human factors.rnCONCLUSION:rnA clear understanding of the different types of testing procedures, and their benefits andrnrequirements, allows the end user to develop an optimum set of these documents for specific plantrnand company requirements.rnThis also maximizes the use of available resources to ensure the logic system's availability andrnreliability.