Calculations in Support of IP 15: The Area Classification Code for Petroleum Installations - Softcover
Synopsis
This report addresses uncertainty in dispersion distances determined by the methodology used in the IP publication A Risk-Based Approach to hazardous area classification, 1998, following a release containing droplets or a mist. It also examines flammability limits, evaporation from pools open sumps and interceptors, and releases into confined areas. The report provides a record of the calculations, methodology and assumptions used to derive dispersion distances with improved confidence; this provides a traceable scientific basis that will be applied to the 2nd edition of IP publication Model code of Safe Practice Part 15 Area Classification Code for Petroleum Installations 1990. Specifically, it provides a methodology and physical basis for deriving parameters such as: characteristics of two-phase releases; shape factors for pressurised releases; flammability limits and hazards arising from particular fluid types. The report also evaluates hazard radii, vapour composition and similar issues. The report will be of interest to safety practitioners who need to demonstrate the basis for their area classifications and to derive specific fluid and process dependent values in a consistent manner.
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