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Chemical Process Safety: Fundamentals with Applications, Second Edition by Joseph F. Louvar - Wayne State University, Daniel A. Crowl - Michigan Technological University

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Chapter 8 Introduction to Reliefs

Despite many safety precautions within chemical plants, equipment failures or operator errors can cause increases in process pressures beyond safe levels. If pressures rise too high, they may exceed the maximum strength of pipelines and vessels. This can result in rupturing of process equipment, causing major releases of toxic or flammable chemicals.

The defense against this type of accident is to prevent the accident in the first place. Inherent safety, described in chapter 1, is the first line of defense. The second line of defense is better process control. A major effort is always directed toward controlling the process within safe operating regions. Dangerous high-pressure excursions must be prevented ...

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