(This problem requires student access to the Dow Fire an
Question and Solution
(This problem requires student access to the Dow Fire and Explosion Index manual.) In a devolatilizer, a solvent (60% cy
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(This problem requires student access to the Dow Fire and Explosion Index manual.) In a devolatilizer, a solvent (60% cyclohexane and 40% pentane) is removed from a polymer and sent to the solvent recycle section of the plant for treatment and recovery. The devolatilizer is located in an open structure with good access for fire fighting. The process area has a 1%sloping concrete surface with a remote impounding area capable of handling all of a spill and 30 min of fire water. The process is run above the flash point of the solvent at 300 mm Hg. The vessel has a relief device set at 50 psig. Assume a potential spill of 8000 lb of flammable material with a heat of combustion of 19.4 X 103B ~ U J I ~ . The process unit has many loss control features. The plant has a diesel emergency power generator with an emergency cooling system. The plant is also under computer control with emergency shutdown based on redundant inputs. Vacuum is always broken with nitrogen. The process has complete, written, and up-to-dateoperating instructions. A reactive chemicals review was completed recently. The process has several interlocks to prevent polymerization. The process area has combustible gas detectors, fireproofing, and a water deluge system. Cable trays are protected with deluge, and portable dry chemical extinguishers are in the process area. Diesel-powered fire water pumps can provide a maximum fire water demand for 4 hr. a. Determine the Dow F&EI value for this process to estimate the relative degree of hazard. b. Assuming an equipment value within the radius of exposure of $1 million, estimate the maximum probable property damage. c. Assuming a product value of $1.50 per pound and an annual plant production rate of 35 million lb, estimate the business interruption loss.
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