DIERS methodology

VSP experiments provide both thermal information on runaway reaetions and information on pressure effeets. The type of pressurization, following the DIERS methodology (i.e., vapor pressure, produe-tion of non-eondensable gases, or both), ean be determined from VSP experiments. The following experimental eonditions are readily aehiev-able using the VSP [14,15] ... 

Fauske, H. K., Emergeney Relief System Design for Runaway Chemieal Reaetion Extension of the DIERs Methodology, Chem. Eng. Res. Des., Vol. 67, pp. 199-202, 1989. 

Leung, J. C. and Fauske, H. K, Runaway System Characterization and Vent Sizing Based on DIERS Methodology, Plant Operations Progress, V. 6, No. 2, 1987, p. 77. 

Fauske, H. K., Grolmes, M. A. and Clare, G. H., Process Safety-Evaluation Applying DIERS Methodology to Existing Plant Operations, Plant/Operations Prog. V. 8, No. 1, 1989, p. 19. 

Fauske, H. K., Emergency- Relief System Design for Reactive and Non-Reactive Systems Extension of the DIERS Methodology, Plant/Operations Prog., V. 7, No. 3, 1988, p. 153. 

G. W. Boicourt, Emergency Relief System (ERS) Design An Integrated Approach Using DIERS Methodology, Process Safety Progress (April 1995), pp. 93-106. 

H Fauske, M A Grolmes G H Clare, "Applying DIERS Methodology to Existing Plant Operations" paper 73F, AlChE Spring 1988 National Meeting., New Orleans, March 1988... 

H Fauske "Emergency Relief System Design for Runaway Chemical Reaction Extension of the DIERS Methodology", Chem Eng Res Dev, 67, 199-201, March 1989... 

The simpler and most reliable approach to the use of the DIERS methodology is the use of FAUSKY s reactive system screening tool (RSST). It is an experimental autoclave which simulates actual situations that may arise in industrial systems. The RSST runs as a differential scanning calorimeter that may operate as a vent-sizing unit where data can readily be obtained and can be applied to full-scale process conditions. The unit is computerized and records plots of pressure vs. temperature, temperature vs. time, pressure vs. time, and the rates of temperature rise and pressure rise vs. the inverse of temperature. From these data it determines the potential for runaway reactions and measures the rates of temperature and pressure increases to allow reliable determinations of the energy and gas release rates. This information can be combined with simplified analytical tools to assess reactor vent size requirements. The cost of setting up a unit of this kind is close to 15,000. 

Fauske, H.K., Grolmes. M.A. and Clare. G.H.. 1989, Process safety evaluation applying DIERS methodology to existing plant operations, Plant/Op Progress, 8... 

Gas and liquid phase discharge calculations arc relatively easy to use. The DIERS methodology requires the use of commercial computer codes or experimental apparatus and is not easy to apply, needing expert knowledge. 

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