August 2015

Special Report: Fluid Flow and Rotating Equipment

Consider Zone 0 vertical pumps for slop pits

Over the past several decades, a leading overseas HPI corporation experienced a disturbing number of explosions in its belowground hydrocarbon sump pits.

Bloch, Heinz P., Hydrocarbon Processing Staff

Over the past several decades, a leading overseas hydrocarbon processing industry (HPI) corporation experienced a disturbing number of explosions in its belowground hydrocarbon sump pits. Gravity-fed oily water “slop” and spillage from surrounding process facilities feed into these concrete pits; they typically range from 15 ft to 35 ft in depth. An unpredictable product slate causes the sumps to be exposed to two highly undesirable conditions: a volatile hydrocarbon mixed with air, and an enclosed space. It can take only a temperature excursion to spark a blaze. Equally unpredictable and random, this high temperature can be caused by a spark or through rubbing contact of metals, w

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