Round Robin vent sizing exercise on a gassy system: 40% dicumyl peroxide in butyrate solvent

L. Véchot, Jake Kay, Jill Wilday, Douglas Carson, Jean Pierre Bigot

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A Round Robin test was set up to obtain a cross comparison of participant's methods regarding a typical pressure relief device (bursting disc) sizing problem. The problem in question was a 'gassy' runaway reaction system: decomposition of 40% w/w dicumyl peroxide in 2,2,4-trimethyl-1,3-pentanediol diisobutyrate. The objective of the Round Robin exercise was to highlight the disparities in the participant's approaches and identify barriers and research needs. Two broad methods were used: one was the implementation of the DIERS method; the other was to follow a similarity or scale-up approach. The scale-up approach consists experimentally determining a minimum safe vent area and scaling up maintaining the vent area/volume ratio. This approach is similar to the one adopted by the UN committee on the Transport of Dangerous Goods for vent sizing of peroxide tankers using a 10 litre vessel. Very different results in terms of vent area were obtained from the seven participants. Analysis of the vent sizing calculations based on calorimetric data showed that the experimental conditions and their interpretation can significantly influence the estimated gas production rate and therefore the final vent area. However, the calculation of the vented mass flux stays largely responsible for the differences in calculated vent area. The critical factor lies in the assumption of single-phase (gas only) venting or two-phase (liquid and gas) venting. The reasons for assuming single-phase venting, which gives a lower vent area, are unclear and may not be justified. The comparison showed that the calorimetric and the similarity approaches diverged significantly when two-phase only venting was assumed. The Round Robin test highlighted the need for more experimental and modelling work towards predicting the nature of the vented fluid at large scale, and in the use of adiabatic calorimetry to determine the maximum gas production rate. Large-scale tests would allow the comparison, the validation and the improvement of the calorimetric and similarity approaches.

Original languageEnglish
Title of host publication22nd Institution of Chemical Engineers Symposium on Hazards 2011, HAZARDS 2011
Subtitle of host publicationProcess Safety and Environmental Protection
PublisherInstitution of Chemical Engineers
Pages278-286
Number of pages9
Edition156
ISBN (Print)9781622767892
Publication statusPublished - 1 Jan 2011
Event22nd Institution of Chemical Engineers Symposium on Hazards 2011: Process Safety and Environmental Protection, HAZARDS 2011 - Liverpool, United Kingdom
Duration: 11 Apr 201114 Apr 2011

Publication series

NameInstitution of Chemical Engineers Symposium Series
Number156
ISSN (Print)0307-0492

Other

Other22nd Institution of Chemical Engineers Symposium on Hazards 2011: Process Safety and Environmental Protection, HAZARDS 2011
CountryUnited Kingdom
CityLiverpool
Period11/4/1114/4/11

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Keywords

  • Adiabatic calorimetry
  • Dicumyl peroxide
  • Pressure relief systems
  • Reaction kinetics
  • Runaway reaction
  • UN method

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Véchot, L., Kay, J., Wilday, J., Carson, D., & Bigot, J. P. (2011). Round Robin vent sizing exercise on a gassy system: 40% dicumyl peroxide in butyrate solvent. In 22nd Institution of Chemical Engineers Symposium on Hazards 2011, HAZARDS 2011: Process Safety and Environmental Protection (156 ed., pp. 278-286). (Institution of Chemical Engineers Symposium Series; No. 156). Institution of Chemical Engineers.