SafeDDT – Safe deflagration to detonation transition.

dashboard Overview

dashboard Motivation

Scenarios with DDT, the transition from deflagration to detonation, are critical for explosions of premixed gases and are decisive for the design of hazardous plant components. The operating pressure to be realised in the plant and the necessary wall thicknesses depend on this. If the output of a plant increases with a higher operating pressure, this is limited by a design that is usually too conservative according to the state of the art, since experimental verification is always required and the maximum explosion pressure also increases with a higher operating pressure. Experimental verifications are only possible to a limited extent due to the high effort involved, as a suitable test rig must be available and prototypes of the plant components must be manufactured.

There are no national or international standards or guidelines that allow a calculated design against gas explosions with DDT. The standard DIN EN 14460 – Explosion-proof equipment (as of April 2018) explicitly mentions that it only applies to deflagrations and not to detonations. A simulation-based assessment has the potential to better evaluate gas explosions with DDT.

ashboard PUBLICATIONS

Müller, M., Bernhardi, O. E., Denecke, J., Schildberg, H. P., Schmidt, J.:
Analysis of Plastic Deformation of Pipes Due to Deflagration to Detonation Transition Using Static Equivalent Pressure, Pressure Vessels and Piping Conference (PVP), American Society of Mechanical Engineers, Las Vegas, 17-22 July 2022, DOI: https://doi.org/10.1115/PVP2022-84790.