Mrp exercise nº7
Transcript of Mrp exercise nº7
PROBLEM Nº 7 (SOLUTION)
• A company that manufactures product X and Y has the following information:Products X and Y Period
4 5 6 7Gross
requirement of X 50 150
Gross requirement of Y
100 50
Item On hand inventory
Lead Time Components
X 0 1 A (1), B (1)Y 0 1 B(1), F (1)A 100 2 C(1), D(1)B 25 1 E(1), F (1)C 50 1 D 75 2 E 75 1 F 115 1
You are asked to:
1. Elaborate the product tree structure and represent the level code.2. Besides the requirements for X and Y, there exits also a demand of 30 units for item D (sold externally) in week 5. Modify the Gross Requirement to reflect this change and elaborate the Net Requirement Plan
PROBLEM Nº 7 (SOLUTION)
• 1. Elaborate the product tree structure and represent the level code.
X Y
A B B F
DC E F E F
PROBLEM Nº 7 (SOLUTION)
There exists an extra demand of 30 units (ítem D). Additionally all ítem follows the lot-for-lot technique, excepts ítem F, which follows optimal order quantity technique. Order cost =140 m.u , holding cost: 1 m.u
ITEM X 1 2 3 4 5 6 7GROSS REQ. 50 150
PLANNED RECEIPTAVAILABILITY
NET REQ. 50 150PLANNED ORD R. 50 150
PLANNED ORD. RE 50 150
WEEKS
ITEM Y 1 2 3 4 5 6 7GROSS REQ. 100 50
PLANNED RECEIPTAVAILABILITY
NET REQ. 100 50PLANNED ORD R. 100 50
PLANNED ORD. RE 100 50
WEEKS
-The Gross requirement (GRP) for these to table will be directly subtracted from the exercise.
Always the GRP of the ítem from the top will be directly given.
-The lead time in both ítem: 1 week.
PROBLEM Nº 7 (SOLUTION)
• For product X is required ítem A and B.
ITEM A 1 2 3 4 5 6 7GROSS REQ. 50 150
PLANNED RECEIPTAVAILABILITY 100 100 100 100 50 50
NET REQ. 100PLANNED ORD R. 100
PLANNED ORD. RE 100
WEEKS
ITEM B 1 2 3 4 5 6 7GROSS REQ. 100 50 50 150
PLANNED RECEIPTAVAILABILITY 25 25 25
NET REQ. 75 50 50 150PLANNED ORD R. 75 50 50 150
PLANNED ORD. RE 75 50 50 150
WEEKS
-The Gross requirement in ítem A will be subtracted from the orders planned of product X. In the case of ítem B, the GRP will include the order planned for product X and Y.
-Availability is given by the exercise (there no safety stock in this exercise).
-Lead time is two week for ítem A, and one week for ítem B.
PROBLEM Nº 7 (SOLUTION)
• Item F Special characteristic (follows a fixed order quantity technique). ITEM F 1 2 3 4 5 6 7
GROSS REQ. 75 150 50 200PLANNED RECEIPT
AVAILABILITY 115 115 40 10 80NET REQ. 110 40 120
PLANNED ORD R. 120 120 120PLANNED ORD. RE 120 120 120
WEEKS -The Gross requirement in ítem F will be subtracted from the orders planned of product H, from ítem B (x2).
-Availability is given by the exercise (there no safety stock in this exercise).
-Lead time is two week for ítem B, and one week for ítem C.
The planned order will be the one that minimize the cost of holding inventories. Optimal quantity =
Q = ROOT ((2 X Ce x D) / Cp x Ɵ )
Q=ROOT (( 2 x 140 x 120) / 1 x 7) = 120
PROBLEM Nº 7 (SOLUTION)
• 2nd level : For making ítem A is required ítem C and D.
ITEM C 1 2 3 4 5 6 7GROSS REQ. 100
PLANNED RECEIPTAVAILABILITY 50 50 50 50
NET REQ. 50PLANNED ORD R. 50
PLANNED ORD. RE 50
WEEKS
ITEM D 1 2 3 4 5 6 7GROSS REQ. 100 30
PLANNED RECEIPTAVAILABILITY 75 75 75 75
NET REQ. 25 30PLANNED ORD R. 25 30
PLANNED ORD. RE 25 30
WEEKS
-Gross req: ítem C will be subtracted from planned order of ítem A. And for ítem D from planned orders of ítem A.
-Availabilities: given.
-Net req: Gross req. Availabilities.
-Lead time: ítem C (1 weeks); ítem D (2 week).
PROBLEM Nº 7 (SOLUTION)
• For making ítem B is required ítem E.
ITEM E 1 2 3 4 5 6 7GROSS REQ. 75 50 50 150
PLANNED RECEIPTAVAILABILITY 75 75
NET REQ. 50 50 150PLANNED ORD R. 50 50 150
PLANNED ORD. RE 50 50 150
WEEKS-Gross req: ítem E will be subtracted from planned order of ítem B (x2).
-Availabilities: given.
-Net req: Gross req. Availabilities.
-Lead time: ítem E (1 week).