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Run-up Distance or Run-up Length
The distance in the direction of flame propagation from the point of ignition to any point in a pipe system. Deflagration flames accelerate over this distance due to turbulence and pre-compression effects. Depending on pipe diameter, surface roughness, and the presence of turbulence-producing obstacles (elbows, valves, etc.) this distance may be sufficient for Deflagration to Detonation Transition to occur
Go to Process Safety Glossary