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Regulations regarding manual access rights for ESD or SIS systems

2009-03-17View Original

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Chemical processing plants generally are equipped with ESD or SIS (Safety Instrumented System) systems. These systems have both automatic and manual functions; they operate in automatic mode during normal production. In the event of an emergency in the plant, it is possible to activate interlocks manually. The question is: how do various factories define the manual operation permissions, and have relevant procedures been established?

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