Recent emphasis on Recognized and Generally Accepted Good Engineering Practices (RAGAGEP) increased the scope of relief systems risk factors that require evaluation to develop complete and compliant Pressure Relief and Flare Systems documentation. Failure to comply with RAGAGEP ((d)(3)(ii)) is the most cited element of the Process Safety Management requirements. This paper discusses how RAGAGEP considerations now require evaluation and proper documentation of risk factors that are often overlooked including but not limited to: dispersion analysis, thermal radiation, noise, vibration risk, reaction forces and structural supports, metal cold temperatures due to expansion cooling and two phase flow, hot temperatures due to fire exposure and/or runaway reactions, PRV stability, chemical reaction systems, and loss of high pressure/low pressure interface. Important RAGAGEP considerations for these additional risk factors are highlighted and discussed. Recommendations are provided on how to best address these factors in the evaluation and documentation of design basis. © 2016 American Institute of Chemical Engineers Process Saf Prog 36: 18–23, 2017
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