DIERS Systems

DIERS. 1992. Emergency Relief System Design Using DIERS Technology, DIERS Project Manual. American Institute of Chemical Engineers, New York. 

The couphng equation is a vapor mass balance written at the vent system entrance and provides a relationship between the vent rate W and the vent system inlet quahty Xq. The relief system flow models described in the following section provide a second relationship between W and Xo to be solved simultaneously with the coupling equation. Once W andXo are known, the simultaneous solution of the material and energy balances can be accomplished. For all the preceding vessel flow models and the coupling equations, the reader is referred to the DIERS Project Manual for a more complete and detailed review. 

Design Institute for Emergeney Relief Systems (DIERS) Institute under the auspices of the American Institute of Chemical Engineers founded to study relief requirements for reactive chemical systems and two-phase flow systems. 

DIERS Design Institute for Emergency Relief Systems... 

In such a process, the water molecule fonned in the elimination step is captured primarily fiom the fixmt side, leading to net retention of configuration for the alcohol. For the ester, the extent of retention and inversion is more balanced, although it vari among individual systems. It is clear om die data in Table 5.18 that the two pairs of stereoisomeric amines do not form the same intermediate, even though a simple mechanistic interpretation would sugg that both would fmm the 2-decalyl cation. The coUap of the ions to product is pvidoitly so rapid that diere is not time for relaxation of the initially formed intermediates to reach a common stnicture. 

The major method of vent sizing for gassy system is two-phase venting to keep the pressure eonstant. This method was employed before DIERS with an appropriate safety faetor [34], The vent area is expressed by ... 

Design Institute for Emergency Relief Systems (DIERS) Institute under the auspiees of the Ameriean Institute of Chemieal Engineers funded to investigate design requirements for vent lines in the ease of two-phase venting. 

Eauske, El. K., The Reaetive System Sereen Tool (RSST) An Easy, Inexpensive Approaeh to the DIERS Proeedure, Int. Symp. on Runaway Reaetion, Pressure Relief Design, and Effluent Handling, AIChE, pp. 51-63, Mareh 11-13, 1998. 

Fisher, H., et ah, Emergeney Relief System Design Using DIERS Teehnology, AIChE s Design Institute for Emergeney Relief Systems, DIERS, AIChE, New York, 1992. 

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. 

A steady-state process is one in wliich there is no change in conditions (temperature, pressure, etc.) or rates of flow with time at any given point in die system. The accumulation term in Eq. (4.5.1) is dien zero. If diere is no cheniieid reaetion, the generation tenn is also zero. All other processes are unsteady state. 

The Fauske and Associates Reactive System. Screening Tool (RSST) w as developed as a result of the DIERS studies and allow s rapid evaluadon of the potential for runaway reactions. It measures the rate of energy and gas release during the runaway and is valuable for screening various process s)stems before commercial designs are completed (see Figure 7-61). 

Bench Scale ERS Sizing Tools— Acquisition of Thermal Data— Apparatus Design and Sample Thermal Data for 5 Systems, DIERS/AIChE, 1986, 159 pages. 

A Direct Experimental Approach to Sizing Emergency Relief Systems—Prototype and Data with Scale-up Procedure, DIERS/.MChE, 1986, 36 pages. 

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., 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. 

Fisher, H. G., DIERS Research Program On Emergency Relief Systems, CEP, 81 (8), 33-36, August 1985. 

Fisher, H. G., The DIERS Users Group (A Forum for Devel-opmeut/Disseminadon of Emergency Relief System Design Technology), Plant/Operations Progress, 8 (2) 70-72, April... 

Klein, H. H., Analyses of DIERS Venting Tests Validation of a Tool for Sizing Emergency Relief Systems for Runatvay Chemical Reactions," Plant/Operations Progress, 5 (1), 1-10, January 1986. 

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