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A8STRACTTests were conducted with 30-50 vol % H, in air at initial pressures from 1 to 12 atm abs on process pipes and tanks to determine the consequences of hydrogen-air deflagration and/or detonation in Savannah River process equipment. Deflagrationto-detonation transition can occur with 30-40 vol % I!, in air in pipes with cross-sectional area >0.304 in 2 at initial pressure ~l atm abs. The ratio of peak detonation pressure to initial pressure in ~-and 2-inch pipes with 30-50 vol % I!, in air is ~25 to 1. Peak pressure to initial pressure ratio in tanks for a deflagration is ~8 to 1. The predetonation distance (the distance the flame travels from the point of ignition to the detonation point) is <6 ft at initial pressures )1 atm abs.Ignition energy of a detonation in ~-and 2-inch pipe connected to a ~-ft-dia x 6-ft straight side tank with initial pressure ~10 atm abs is not sufficient to cause a detonation in the tank. The ratio of peak pressure to initial pressure in the tank for a deflagration is ~8 to 1.