Premium
Batch runaway reaction relief: Re‐evaluation of “Credible” scenario
Author(s) -
Singh Jasbir
Publication year - 1997
Publication title -
process safety progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.378
H-Index - 40
eISSN - 1547-5913
pISSN - 1066-8527
DOI - 10.1002/prs.680160410
Subject(s) - sizing , process (computing) , process engineering , thermal runaway , isothermal process , batch processing , computer science , biochemical engineering , reliability engineering , environmental science , engineering , chemistry , thermodynamics , power (physics) , physics , organic chemistry , battery (electricity) , programming language , operating system
Abstract Many chemical reactions in the fine chemical and related industries are performed in a semi‐batch manner under isothermal conditions. Relief system design evaluation for runaway reactions, using DIERS methodology for example, is frequently studied adiabatically using data derived from batch mode testing. In many cases, however, evaluation of the process isothermally under the realistic semi‐batch mode can be extremely useful, often helping to greatly reduce the vent size as a result of a better understanding of the process. In some cases, it is even possible to eliminate runaway reaction as a viable case for relief sizing. Such evaluations of venting are fully consistent with DIERS methodology. This paper presents the arguments for sizing vents for scenarios other than the very worst case, by objective evaluation of trips and interlocks, so that the level of risk is reduced to an acceptable level without the need for extremely large vents.