The following guidelines, standards, and codes are cited in this mended practice: API Std 521 Guide for Pr essure-Relieving and Depressuring Syst ems—Pressure and Natural Gas Industries-Pressure- Relieving and Depressurizing Systems RP 752 Ma nagement of Hazards Associated with Location of Process Plant Buildings AIChE PS 2 Guidelines for Evaluating the C haracteristics of V a por Cloud Ex plosions, Flash Fires, and BLEVEs Guidelines for Facility Siting and Layout Guidelines for Chemical Proces s Q uan titative Risk Analysis Guidelines for Evaluating Process Plant Buildings for External Explosions and Fires 1American Institute of Chemical Engineers, 3 Park Avenue, New York, New York 10016, . 2Center for Chemical Process Safety, 3 Park Avenue, 19th Floor, New York, New York 10016, .