Chapter 10. Relief Sizing

The learning objectives for this chapter are to understand relief sizing for:

  1. Liquid and vapor service.

  2. Two-phase flow.

  3. Fire exposure.

  4. Liquid thermal expansion.

Relief sizing calculations are performed to determine the vent area of the relief device. Relief sizing is a complex subject with many important subtleties too numerous to present here–experts in this area must be consulted. This chapter presents only a few simple cases. Also, relief sizing technology continues to evolve with time, particularly with respect to two-phase relief sizing.

Relief devices are considered preventive safeguards since they protect process equipment from the effects of high pressure. The pressure relief device might never be used, but ...

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