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Subject: physical integrity Safety interlock systemsSafety interlock systems are typically used to prevent major process operating upsets from threatening the physical integrity of process equipment usually by mitigating the extent of pressure and/or temperature deviations. As stated previously, instrumen¬tation-based interlocks are not generally used in place of emergency relief devices or to reduce the required relief capacity. Such interlocks are more commonly used to reduce the likelihood that an emergency relief device will be activated.
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