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Structural Component Testing

Large Scale Blast Load Generator Testing

The Deflagration Load Generator (DLG) test rig is employed by BakerRisk to produce blast waves with a gradual rise to peak pressure, which is representative of the blast wave from a vapor cloud explosion (VCE). In contrast, high explosives (e.g., TNT, C4, etc.) and conventional shock tubes produce shock waves, with an instantaneous rise to peak pressure. The DLG test rig is essentially a strong box with one open side. The open side is initially covered with a thin plastic sheet to allow a uniform fuel-air mixture at the desired concentration to be developed. The rig contains congestion to induce flame acceleration and produce a blast wave with the desired characteristics. The resulting blast wave propagates out of the test rig open side and towards the target structure. This arrangement is illustrated below.

Typical overpressure histories are shown below for a range of standoff distances from the rig face.

Photographs of the DLG test rig just prior to and after ignition are shown below.

The DLG test rig provides the capacity to produce blast waves representative of a VCE over a range of peak pressures and durations. The DLG test rig is designed to withstand internal applied blast overpressures of up to 30 psig. The target blast overpressure can be varied by controlling the fuel concentration and test article standoff distance.

BakerRisk has tested a number of tent structures with the DLG for the Explosion Research Cooperative (ERC), the American Petroleum Institute (API), and for individual clients. The DLG test rig is designed to support testing of a wide range of structures, including: