Ncc Case

15.760: National Cranberry Case

1. Admin: Webvan lineament; UHS case

2. What are the sources of variability in the NCC case?

3. What are the problems NCC is experiencing that should be

addressed?

4. Describe the do fall Diagram.

5. Assess possible options for relieving truck waiting.

6. How would you assess converting some run dry bins to starchy?

7. How would you assess whether you can begin at 8 am?

8. How would you assess labor cost impacts?

9. How would you deal with the statistical distribution of wet/dry and volume

over the days of the flavor?

10. Can you eliminate/reduce demand peaks?


National Cranberry

Process Flow Diagram

weighed/
graded

Unload

5-10 min/truck

tested/
sampled

Freeze

1500 casks/hr
dry
1-16
250 drums
=4000 bbls
both
17-24
250 bbls
=2000 bbls

1500 bbls/hr

destone

dechaff

Bulk Bins
800 bbl/hr
3 x 400 bbls/hr

dry

2 x 1500 bbls/hr

destone

wet

wet
25-27
3x400 bbls = 1200 bbls

separate
dry

dechaff
2 x 1500 bbls/hr

3 x 200 bbls/hr

Bulk Truck
2000 bbl/hr
Bag
667 bbl/hr
Freeze

Wet Cranberry Inventory Buildup
go in: buildup 18000 x 70% wet =12600 bbl/day
12600/12=1050 bbls/hr; Plant begins operations at 11:00;
Drying bottleneck @ 600 bbl/hr
Truck waiting =
7800

16.



67 hrs x (4600/2)/75
= 511 hours

7500


-600/hr

6000

450x8
4500


4200

3000


3200/1050
= trucks begin waiting at 10:03 am

4600/600
= 7.67hrs
= 2:40 am
No more trucks

1050x4

1500


7:00

9:00

11:00

13:00

15:00

17:00

19:00

21:00

23:00

1:00

3:00

Plant is empty afterward 7800/600 = 13 hours after 19:00 or 8 am the next morning
center run time = 12600/600 = 21 hours

Wet Cranberry Inventory Buildup
Assume: buildup 18000 x 70% wet =12600 bbl/day
12600/12=1050 bbls/hr; Plant begins operations at 7:00;
Drying bottleneck @ 600 bbl/hr
Truck waiting =
8.67 hrs x (2200/2)/75
= 127 hours

7500


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