GS-2 - OM 335 Bagchi Group Homework-2 Names: SOLUTION Case:...

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OM 335 Bagchi Names: SOLUTION Group Homework-2 Case: National Cranberry Cooperative (Abridged) The following refers to the ‘process fruit’ operation at RP1 in 1981. Note that dry and wet berries share some resources (Kiwanee dumpers, dual-use holding bins and separators). In case of resource contention, assume that capacities will be allocated in a 70:30 ratio to the two types of berries to reflect the percentage of wet berries (70%) expected in 1981. Also assume that these capacities can be reallocated as necessary between dry and wet berries with little or no changeover time. Finally, assume that the actual processing time of berries is very short. Analysis: (1) Draw a process flow chart (diagram) for dry and wet berry processing. Assume that bulking and bagging capacity is more than adequate. What are the bottlenecks for dry and wet berry processing? What are the capacities (in barrels per hour) for dry and wet berry processing? Process Flow Diagram Figure 1 Figure 1 shows the process flow diagram. The following extract from the case helps us to construct the process flow diagram: (page 4, lines 1-3) “The process could be classified into several operations: receiving and testing, dumping, temporary holding, destoning, dechaffing, drying, separation, and bulking and bagging.” Truc k Que ue Kiwanee Dumpers (5) Dry Storage Bins17-24, 1- 16 Wet Storage Bins17-24, 25- 27 Deston e (3) Dechaff (3) Dryers (3) Weigh, test cranberrie 3000 b/ 4000-6000 bbls 1200-3200 bbls 4500 4500 600 b/ Jumbo Separators & Bailey Mills (3 1200 Bulking & Baggin Trucks D W D W W W D D Legend b/h = bbl/hr D = dry cranberries 1
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What is the capacity of a dumper? We are told that it usually took a truck 5-10 minutes to dump its contents and the average truck delivery was 75 bbl. Hence, a good estimate of the capacity of a dumper is 600 bbl./hr. There are five Kiwanee dumpers for a combined capacity of 3,000 bbl./hr. The allocation of this dumping capacity is as follows: 900 bbls/hr. to dry berries and 2,100 bbl./hr. to wet berries. The only other resource for which there is contention is the Jumbo separators & Bailey mills. The total separation capacity is 1,200 bbl./hr. which is allocated as follows: 360 bbl./hr. to dry berries and 840 bbl./hr. to wet berries. Consider the processing of dry berries. The relevant capacities are as follows: dumping - 900 bbl./hr., destoning – 4,500 bbl./hr., dechaffing – 1,500 bbl./hr., and separation – 360 bbl./hr. This suggests that separators are the bottleneck for dry berries and the capacity for dry berry processing is 360 bbl./hr. Consider the processing of wet berries. The relevant capacities are as follows: dumping – 2,100 bbl./hr., dechaffing – 3,000 bbl./hr., drying – 600 bbl./hr., and separation – 840 bbl./hr. This suggests that dryers are the bottleneck for wet berries and the capacity for wet berry processing is 600 bbl./hr. Note that wet berries can only use 600 bbl./hr. of separation capacity.
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This note was uploaded on 04/20/2011 for the course OM 335 taught by Professor Jonnalagedda during the Spring '08 term at University of Texas.

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GS-2 - OM 335 Bagchi Group Homework-2 Names: SOLUTION Case:...

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