Classification of Hazardous Locations - IChemE by A. W. Cox, Frank P. Lees, M. L. Ang

By A. W. Cox, Frank P. Lees, M. L. Ang

This document gathers jointly info and data on classifying unsafe locations.IChemE, the establishment of Chemical Engineers, is the guts for chemical, biochemical and technique engineering execs world wide. we're the middle of the method group, selling competence and a dedication to sustainable improvement, advancing the self-discipline for the advantage of society and helping the pro improvement of individuals. many of the parts we put up in contain: -Safety within the technique industries - the BP approach security series-Consultancy for chemical engineers-Project administration within the strategy industries-Contract administration within the approach industries - foreign sorts of agreement series-Communication talents for engineers

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For others several values are applicable. Thus for flanges there are separate sizes for leaks due to complete loss of a section and for other leaks. For valves there are separate sizes for normal and for severe duty or large valves. For centrifugal pumps and compressors there is a range of sizes, depending on the type of seal and on the shaft diameter. 35 CLASSIFICATION OF HAZARDOUS LOCATIONS While the foregoing approach is in line with that generally adopted in hazardous area classification work, it is rather arbitrary.

Fl n n(. N P 1a 1e P1. 24) only) ratio of specific heats of gas i pressure ratio 1. constant p density of air (kg/rn3) density of gas at exit (kg/rn3) density of gas at equivalent conditions (kg/rn3) density of liquid (kg/rn3) density of gas at outlet (kg/rn3) density of vapour (kg/rn3) dispersion coefficient (m) mass fraction flashing off as vapour, flash fraction mass fraction forming spray, spray fraction mass fraction forming vapour and spray concentration (kg/rn3) P Peq PL p0 p1.

Spray fraction C. Y Y Y Y Y V V Y Y V V V Y Evaporation of volatile liquid Cl Evaporation rate C2 Pool size D. Evaporation of cryogenic liquid Y DI Evaporation rate B. Liquid dispe,ioii as jet Oct throw) El Jet range (theoretical) E2 Jet range Y V V (practical) E3 Subsidiary data V a) Coefficient F Gas dispersion as jet Fl Jet range V V Y Y Y Y V Y F2 Subsidiary data a) Effective diameter b) Effective velocity c) Effective density V G. conic Sonic Liquid jets Gas dispersion (passive) This system of models does not cover all the situations which may arise.

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