RAPID-N

Property Estimator

Name	Distance to 1 psi overpressure for VCE (TNT-equivalency method)
Property	Endpoint Distance
Type	Function
Function	`17 * pow([fyE:q] * [Qf:kg] * [Hc:kJ/kg] / 4680, 1/3)`
Unit	m
Validity Conditions	Substance Type: Flammable; Vapor Cloud Explosion Model: TNT Equivalency; Fire/Explosion Event: Vapor Cloud Explosion; Endpoint Overpressure: 1 psi
Precedence	Auto
Disabled	No
References	U.S. EPA, "Risk Management Program Guidance for Offsite Consequence Analysis", 1999
Notes	See U.S. EPA (1999), Equation C-1 (section C-1, page C-1). The equation is based on TNT-equivalency method. Original reference is CCPS (1994). Heat of explosion of trinitrotoluene (TNT) is taken as 4680 kJ/kg. The factor 17 is a constant associated with 1.0 psi overpressure.
Access	Public