Technical Reports

Tank Car Thermal Analysis, Volume I, User's Manual for Analysis Program

  • 01
  • Nov
  • 1998
AUTHOR: Milton R. Johnson
SUBJECT: Hazardous Materials
KEYWORDS: railroad tank car; tank car failure; hazardous material release; fire effects
ABSTRACT: The computer program AFFTAC is described. The program can be used to analyze the behavior of railroad tank cars when subjected to fire. It is designed to perform the analyses which are required to determine if a tank car meets the requirements of the Code of Federal Regulations, Title 49, Part 179, Section 179.18. The conditions associated with two types of fires are built into the program, the pool fire environment, where the car is fully engulfed by flame, and the torch fire environment, where only a small area of the tank is subjected to a high intensity flame. Other fire conditions can also be analyzed. A wide variety of tank car types can be considered including cars equipped with safety relief valves or safety vent closed with a frangible disc. The program is described in two volumes. This volume describes the manner in which data is entered to describe the initial analysis conditions. The thermal properties of the product contained in the tank car are also required for the analysis. Properties of 16 commodities are contained in the program. For other commodities, the thermal properties can be entered as part of the initial analysis conditions. Several options are also provided for the output of the results of an analysis.