Institute of Makers of Explosives Safety Analysis for Risk (IMESAFR) is a probabilistic risk assessment tool used to calculate risk to personnel from explosives facilities. This tool is a supplement to the longstanding American Table of Distances (ATD) and other Quantity/Distance (QD) systems. Whereas QD provides a level of safety based on explosives quantity and distance, IMESAFR determines a level of safety based upon risk. In addition to explosives quantity and distance, IMESAFR uses the donor structure, the activity at the donor, and the structure of the exposed sites to determine the level of safety.

IMESAFR provides a standard TNT-based engine for risk calculations. Most explosives behave in a manner sufficiently similar to TNT to simply scale output of those materials up or down if more or less powerful than TNT (called TNT equivalence), but ammonium nitrate (AN) has a distinct waveform which cannot be approximated with TNT equivalence. Therefore, IMESAFR features a separate AN engine to calculate the risk from AN operations. IMESAFR’s AN Engine is a semi-empirical, physics-based, fast-running model that characterizes AN events based on the AN detonation waveform (built from dedicated AN testing and analysis programs rather than TNT equivalency).

Demo Video

The video below will walk through a brief look at what running IMESAFR looks like.

System Requirements

IMESAFR is executable on Windows 7, 8, 8.1, and 10. Windows 7 is the minimum recommendation for running IMESAFR. Currently, neither MacOS nor Linux are supported. A minimum of 4 GB of RAM is recommended for running IMESAFR scenarios.


Based on a joint position of all stakeholders (APT, IME, and regulators), training is required for access to the software. To become a certified user, users must demonstrate proficiency at/after the conclusion of training. In order to access the AN engine in IMESAFR, users are required to attend the add-on AN module training.

Click here for a list of people who have received a certificate of training and training number.

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