Stoddard County Jail


Smoke control assessment utilizing computational fire &e egress modeling.

The Approach

A computational fire and egress modeling approach was utilized to determine an appropriate exhaust capacity for a smoke control system protecting pods within a county prison.  In accordance with Section 408.9 of the IBC, a smoke control system was required to be provided, designed in accordance with Section 909.  The exhaust method was utilized for this project, in which tenable conditions were required to be maintained 6 feet above the highest walkable area of the pod, for a time period exceeding the Required Safe Egress Time (RSET).  FDS was utilized to determine expected conditions throughout a representative pod, while Pathinder was utilized to predict egress from such.  The results from this analysis determined that 30,000 CFM of exhaust was required in order to maintain tenable conditions for egress, taking into consideration delays due to operational procedures of prison staff.  This provided a 60% reduction in required exhaust capacity when compared to that of algebraic hand calculations, which were initially performed.  FDS was also beneficial in determining an appropriate makeup air scheme for this relatively tight compartment.

Estimated Cost-Savings

The 60% reduction in exhaust capacity and decrease in required makeup air resulting in an order of magnitude savings of $50,000 to $80,000 per pod.

Project details

  • Year: 2019
  • Project: Stoddard County Jail
  • Customer: Ross & Baruzzini
  • Estimated Savings: $50k-$80k per pod
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