Tabel 5.15. Rekapitulasi Perhitungan Safety Stock Pada Setiap Supplier
Supplier Safety Stock
Thailand 81 Kg
Vietnam 332 Kg
Malaysia 151 Kg
Cikande 169 Kg
Sumber : Pengolahan Data
5.2.5. Jumlah Permintaan Setiap Minggu
Jumlah permintaan setiap minggu pada setiap supplier diperoleh dengan pembagian antara jumlah permintaan ke setiap supplier setiap bulan dengan
jumlah minggu yang ada pada setiap bulan tersebut. Jumlah permintaan ke setiap supplier
dapat dilihat pada Tabel 5.16.
Tabel 5.16. Jumlah Permintaan Pada Supplier Setiap Minggu
Periode Jumlah
Minggu Thailand
Vietnam Malaysia
Cikande
Jan-16 4
8302 7481
4520 5796
Feb-16 5
6687 5979
3585 4639
Mar-16 4
8417 7466
4440 5802
Apr-16 4
8479 7456
4396 5806
May-16 5
6834 5956
3481 4647
Jun-16 4
8610 7433
4302 5812
Jul-16 5
6944 5935
3402 4653
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Tabel 5.16. Jumlah Permintaan Pada Supplier Setiap Minggu Lanjutan
Periode Jumlah
Minggu Thailand
Vietnam Malaysia
Cikande
Aug-16 4
8753 7404
4199 5819
Sep-16 4
8828 7388
4144 5822
Oct-16 5
7125 5896
3269 4661
Nov-16 4
8988 7351
4026 5829
Dec-16 4
9072 7330
3964 5832
Sumber : Pengolahan Data
5.2.6. Distribution Resources Planning Worksheet
Perencanaan DRP disusun untuk setiap supplier dalam time bucket mingguan sebab lead time masing-masing DC tidak melewati 1 bulan atau hanya
dalam mingguan. Dalam distribution resources planning worsheet terdapat beberapa istilah
yang perlu diketahui yaitu : 1.
On hand balance adalah jumlah persediaan awal produk yang ada pada
distribution centre .
2. Safety Stock
adalah persediaan untuk melindungi atau menjaga kemungkinan terjadinya kekurangan produk.
3. Lead time
adalah waktu yang diperlukan dalam pelepasan order sampai order diterima di stock room pada distribution centre.
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4. Order quantity
adalah jumlah produk yang dikirimkan untuk setiap kali pemesanan
5. Demands forecast
adalah peramalan jumlah permintaan dari masing-masing distribution centre
6. In transit
adalah jumlah produk yang sedang dalam proses pendistribusian 7.
Projected on hand adalah persediaan yang ada dan siap digunakan.
8. Planned shipments
– Receipt Date adalah jadwal perencanaan penerimaan produk yang dikirim.
9. Planned shipments
– Ship Date adalah jadwal perencanaan pengiriman produk.
Distribution Resources Planning Worksheet untuk setiap Supplier dapat
dilihat pada tabel 5.17 sampai tabel 5.21. Langkah-langkah pengisian Distribution Resources Planning Sheet untuk
Supplier Thailand adalah :
1. On hand balance
= 16.800 Kg diperoleh dari tabel 5.3 2.
Lead time = 25 hari diperoleh dari tabel 5.2
3. Order quantity
= 41.786 Kg diperoleh dari tabel 5.14 4.
Safety stock = 81 Kg diperoleh dari tabel 5.16
5. Projected on Hand
Past Due = 16.800 Kg diperoleh dari On hand Balance
6. Demands forecast
1
st
Week = 8302 Kg diperoleh dari tabel 5.17
7. In transit
1
st
Week = 0 unit
8. Planned shipments
– Ship Date = 41.786 Kg diperoleh dari Order Quantity
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9. Planned shipments
– Receipt Date = 41.786 Kg diperoleh dari Order Quantity
10. Projected on hand
1
st
Week = Projected on Hand Past Due + Order quantity - Demands forecast
1
st
Week = 16.800 + 41.786
– 8.302 = 50.284Kg.
11. Demands forecast
2
nd
Week = 8.302 Kg diperoleh dari tabel 5.17 12.
Projected on hand 2
nd
Week = Projected on hand 1
st
Week - Demands forecast
2
nd
Week = 50.284 Kg – 8.302 Kg = 41.982 Kg.
13. Demand forecast
3
rd
Week = 8.302 Kg diperoleh dari tabel 5.17 14.
Projected on hand 3
rd
Week = Projected on hand 2
nd
Week - Demand
forecast 3
rd
Week = 41.982 Kg - 8.302 Kg = 33.680 Kg. 15.
Dilakukan hal yang sama dengan proses yang sama untuk 52 minggu ke depan sehingga Distribution Resources Planning Worksheet terisi secara
keseluruhan. Adapun perhitungan Distribution Resources Planning Worksheet untuk
Supplier Thailand dapat dilihat pada tabel 5.18.
Langkah-langkah pengisian Distribution Resources Planning Sheet untuk Supplier
Vietnam adalah : 1.
On hand balance = 15.200 Kg diperoleh dari tabel 5.3
2. Lead time
= 25 hari diperoleh dari tabel 5.2 3.
Order quantity = 37.739 hari diperoleh dari tabel 5.14
4. Safety stock
= 332 Kg diperoleh dari tabel 5.16
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5. Projected on Hand
Past Due = 15.200 kg diperoleh dari On hand Balance 6.
Demands forecast 1
st
Week = 7.481 Kg diperoleh dari tabel 5.17
7. In transit
1
st
Week = 0 unit
8. Planned shipments
– Ship Date = 37.739 Kg diperoleh dari Order Quantity 9.
Planned shipments – Receipt Date = 37.739 Kg diperoleh dari Order
Quantity 10.
Projected on hand 1
st
Week = Projected on Hand Past Due + Order quantity - Demands forecast
1
st
Week = 15.200 Kg + 37.739 Kg
– 7.481 Kg = 45.458 Kg
11. Demands forecast
2
nd
Week = 7.481 Kg diperoleh dari tabel 5.17 12.
Projected on hand 2
nd
Week = Projected on hand 1
st
Week - Demands forecast
2
nd
Week = 45.458 Kg – 7.481 Kg = 37.977 Kg.
13. Demand forecast
3
rd
Week = 7.481 Kg diperoleh dari tabel 5.17 14.
Projected on hand 3
rd
Week = Projected on hand 2
nd
Week - Demand
forecast 3
rd
Week = 37.977 Kg – 7.481 Kg = 30.496 Kg.
15. Dilakukan hal yang sama dengan proses yang sama untuk 52 minggu ke
depan sehingga Distribution Resources Planning Worksheet terisi secara keseluruhan.
Adapun perhitungan Distribution Resources Planning Worksheet untuk Supplier
Vietnam dapat dilihat pada tabel 5.19.
Langkah-langkah pengisian Distribution Resources Planning Sheet untuk Supplier
Malaysia adalah :
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1. On hand balance
= 9.900 Kg diperoleh dari tabel 5.3 2.
Lead time = 18 hari diperoleh dari tabel 5.2
3. Order quantity
= 21.218 Kg diperoleh dari tabel 5.14 4.
Safety stock = 151 Kg diperoleh dari tabel 5.16
5. Projected on Hand
Past Due = 9.900 Kg diperoleh dari On hand Balance 6.
Demands forecast 1
st
Week = 4.520 kg diperoleh dari tabel 5.17
7. In transit
1
st
Week = 0 unit
8. Planned shipments
– Ship Date = 21.218 Kg diperoleh dari Order Quantity 9.
Planned shipments – Receipt Date = 21.218 Kg diperoleh dari Order
Quantity 10.
Projected on hand 1
st
Week = Projected on Hand Past Due + Order quantity - Demands forecast
1
st
Week = 9.900 Kg + 21.218 Kg
– 4.520 Kg = 26.598 Kg.
11. Demands forecast
2
nd
Week = 4.520 Kg diperoleh dari tabel 5.17 12.
Projected on hand 2
nd
Week = Projected on hand 1
st
Week - Demands forecast
2
nd
Week = 26.598 Kg – 4.520 Kg = 22.078 Kg.
13. Demand forecast
3
rd
Week = 4.520 Kg diperoleh dari tabel 5.17 14.
Projected on hand 3
rd
Week = Projected on hand 2
nd
Week - Demand
forecast 3
rd
Week = 22.078 Kg – 4.520 Kg = 17.558 Kg.
15. Dilakukan hal yang sama dengan proses yang sama untuk 52 minggu ke
depan sehingga Distribution Resources Planning Worksheet terisi secara keseluruhan.
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Adapun perhitungan Distribution Resources Planning Worksheet untuk Supplier
Malaysia dapat dilihat pada tabel 5.20. Langkah-langkah pengisian Distribution Resources Planning Sheet untuk
Supplier Cikande adalah :
1. On hand balance
= 12.100 Kg diperoleh dari tabel 5.3 2.
Lead time = 7 hari diperoleh dari tabel 5.2
3. Order quantity
= 24.778 Kg diperoleh dari tabel 5.14 4.
Safety stock = 169 Kg diperoleh dari tabel 5.16
5. Projected on Hand
Past Due = 12.100 Kg diperoleh dari On hand Balance 6.
Demands forecast 1
st
Week = 5.796 Kg diperoleh dari tabel 5.17
7. In transit
1
st
Week = 0 unit
8. Planned shipments
– Ship Date = 24.778 Kg diperoleh dari Order Quantity 9.
Planned shipments – Receipt Date = 24.778 Kg diperoleh dari Order
Quantity 10.
Projected on hand 1
st
Week = Projected on Hand Past Due + Order quantity - Demands forecast
1
st
Week = 12.100 Kg + 24.778 Kg
– 5.796 Kg = 31.082 Kg.
11. Demands forecast
2
nd
Week = 5.796 Kg diperoleh dari tabel 5.17 12.
Projected on hand 2
nd
Week = Projected on hand 1
st
Week - Demands forecast
2
nd
Week = 31.082 Kg – 5.796 Kg = 25.286 Kg.
13. Demand forecast
3
rd
Week = 5.796 Kg diperoleh dari tabel 5.17 14.
Projected on hand 3
rd
Week = Projected on hand 2
nd
Week - Demand
forecast 3
rd
Week = 22.286 Kg – 5.796 Kg = 19.490 Kg.
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15. Dilakukan hal yang sama dengan proses yang sama untuk 52 minggu ke
depan sehingga Distribution Resources Planning Worksheet terisi secara keseluruhan.
Adapun perhitungan Distribution Resources Planning Worksheet untuk Supplier
Cikande dapat dilihat pada tabel 5.21.
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Tabel 5.18. Distribution Resources Planning Worksheet untuk Supplier Thailand
Distribution Resources Planning Worksheet Thailand On Hand Balance : 16.800 Kg
Lead Time : 25 hari = 4 week Safety Stock : 81 Kg
Order Quantity : 41.786 Kg Supplier : Thailand
Past Due Week
1 2
3 4
5 6
7 8
9 10
11 12
13 Demand Forecast
8.302 8.302
8.302 8.302
6.687 6.687
6.687 6.687
6.687 8.417
8.417 8.417
8.417
In Transit Projected on Hand
16.800 50.284
41.982 33.680
25.378 18.691
12.004 47.103
40.416 33.729
25.312 16.895
8.478 41.847
Planned Shipment-Receipt Date
41.786 41.786
41.786
Planed Shipments - Ship Date
41.786 41.786
41.786
Past Due Week
14 15
16 17
18 19
20 21
22 23
24 25
26 Demand Forecast
8.479 8.479
8.479 8.479
6.834 6.834
6.834 6.834
6.834 8.610
8.610 8.610
8.610
In Transit Projected on Hand
41.847 33.368
24.889 16.410
7.931 42.883
36.049 29.215
22.381 15.547
48.723 40.113
31.503 22.893
Planned Shipment-Receipt Date
41.786 41.786
Planed Shipments - Ship Date 41.786
41.786 41.786
Past Due Week
27 28
29 30
31 32
33 34
35 36
37 38
39 Demand Forecast
6.944 6.944
6.944 6.944
6.944 8.753
8.753 8.753
8.753 8.828
8.828 8.828
8.828
In Transit Projected on Hand
22.893 15.949
9.005 43.847
36.903 29.959
21.206 12.453
45.486 36.733
27.905 19.077
10.249 43.207
Planned Shipment-Receipt Date
41.786 41.786
41.786
Planed Shipments - Ship Date 41.786
41.786
Past Due Week
40 41
42 43
44 45
46 47
48 49
50 51
52 Demand Forecast
7.125 7.125
7.125 7.125
7.125 8.988
8.988 8.988
8.988 9.072
9.072 9.072
9.072
In Transit Projected on Hand
43.207 36.082
28.957 21.832
14.707 49.368
40.380 31.392
22.404 13.416
46.130 37.058
27.986 18.914
Planned Shipment-Receipt Date 41.786
41.786
Planed Shipments - Ship Date 41.786
41.786
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Tabel 5.19. Distribution Resources Planning Worksheet untuk Supplier Vietnam
Distribution Resources Planning Worksheet Vietnam On Hand Balance : 15.200 Kg
Lead Time = 25 hari = 4 week Safety Stock : 332 Kg
Order Quantity : 37.739 Kg Supplier : Vietnam
Past Due Week
1 2
3 4
5 6
7 8
9 10
11 12
13 Demand Forecast
7.481 7.481
7.481 7.481
5.979 5.979
5.979 5.979
5.979 7.466
7.466 7.466
7.466
In Transit Projected on Hand
15.200 45.458
37.977 30.496
23.015 17.036
11.057 42.817
36.838 30.859
23.393 15.927
8.461 38.734
Planned Shipment-Receipt Date 37.739
37.739 37.739
Planed Shipments - Ship Date
37.739 37.739
37.739
Past Due Week
14 15
16 17
18 19
20 21
22 23
24 25
26 Demand Forecast
7.456 7.456
7.456 7.456
5.956 5.956
5.956 5.956
5.956 7.433
7.433 7.433
7.433
In Transit Projected on Hand
38.734 31.278
23.822 16.366
8.910 40.693
34.737 28.781
22.825 16.869
9.436 39.742
32.309 24.876
Planned Shipment-Receipt Date 37.739
37.739
Planed Shipments - Ship Date 37.739
37.739 37.739
Past Due Week
27 28
29 30
31 32
33 34
35 36
37 38
39 Demand Forecast
5.935 5.935
5.935 5.935
5.935 7.404
7.404 7.404
7.404 7.388
7.388 7.388
7.388
In Transit Projected on Hand
24.876 18.941
13.006 7.071
38.875 32.940
25.536 18.132
10.728 41.063
33.675 26.287
18.899 11.511
Planned Shipment-Receipt Date 37.739
37.739
Planed Shipments - Ship Date 37.739
37.739
Past Due Week
40 41
42 43
44 45
46 47
48 49
50 51
52 Demand Forecast
5.896 5.896
5.896 5.896
5.896 7.351
7.351 7.351
7.351 7.330
7.330 7.330
7.330
In Transit Projected on Hand
11.511 5.615
37.458 31.562
25.666 19.770
12.419 42.807
35.456 28.105
20.775 13.445
43.854 36.524
Planned Shipment-Receipt Date 37.739
37.739 37.739
Planed Shipments - Ship Date
37.739 37.739
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Tabel 5.20. Distribution Resources Planning Worksheet untuk Supplier Malaysia
Distribution Resources Planning Worksheet Malaysia On Hand Balance : 9.900 Kg
Lead Time : 18 hari = 3 week Safety Stock : 151 Kg
Order Quantity : 21.218 Kg Supplier: Malaysia
Past Due Week
1 2
3 4
5 6
7 8
9 10
11 12
13 Demand Forecast
4.520 4.520
4.520 4.520
3.585 3.585
3.585 3.585
3.585 4.440
4.440 4.440
4.440
In Transit Projected on Hand
9.900 26.598
22.078 17.558
13.038 9.453
5.868 23.501
19.916 16.331
11.891 7.451
24.229 19.789
Planned Shipment-Receipt Date
21.218 21.218
21.218
Planed Shipments - Ship Date
21.218 21.218
21.218
Past Due Week
14 15
16 17
18 19
20 21
22 23
24 25
26 Demand Forecast
4.396 4.396
4.396 4.396
3.481 3.481
3.481 3.481
3.481 4.302
4.302 4.302
4.302
In Transit Projected on Hand
19.789 15.393
10.997 6.601
23.423 19.942
16.461 12.980
9.499 6.018
22.934 18.632
14.330 10.028
Planned Shipment-Receipt Date
21.218 21.218
Planed Shipments - Ship Date
21.218 21.218
21.218
Past Due Week
27 28
29 30
31 32
33 34
35 36
37 38
39 Demand Forecast
3.402 3.402
3.402 3.402
3.402 4.199
4.199 4.199
4.199 4.144
4.144 4.144
4.144
In Transit Projected on Hand
10.028 6.626
24.442 21.040
17.638 14.236
10.037 5.838
22.857 18.658
14.514 10.370
6.226 23.300
Planned Shipment-Receipt Date
21.218 21.218
21.218
Planed Shipments - Ship Date
21.218 21.218
Past Due Week
40 41
42 43
44 45
46 47
48 49
50 51
52 Demand Forecast
3.269 3.269
3.269 3.269
3.269 4.026
4.026 4.026
4.026 3.964
3.964 3.964
3.964
In Transit Projected on Hand
23.300 20.031
16.762 13.493
10.224 6.955
24.147 20.121
16.095 12.069
8.105 4.141
21.395 17.431
Planned Shipment-Receipt Date
21.218 21.218
Planed Shipments - Ship Date
21.218 21.218
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Tabel 5.21. Distribution Resources Planning Worksheet untuk Supplier Cikande
Distribution Resources Planning Worksheet Cikande On Hand Balance : 12.100 Kg
Lead Time : 7 hari = 1 week Safety Stock : 169 Kg
Order Quantity : 24.778 Kg Supplier : Cikande
Past Due Week
1 2
3 4
5 6
7 8
9 10
11 12
13 Demand Forecast
5.796 5.796
5.796 5.796
4.639 4.639
4.639 4.639
4.639 5.802
5.802 5.783
5.783
In Transit Projected on Hand
12.100 31.082
25.286 19.490
13.694 9.055
29.194 24.555
19.916 15.277
9.475 28.451
22.668 16.885
Planned Shipment-Receipt Date
24.778 24.778
24.778
Planed Shipments - Ship Date
24.778 24.778
24.778
Past Due Week
14 15
16 17
18 19
20 21
22 23
24 25
26 Demand Forecast
5.777 5.777
5.777 5.777
4.617 4.617
4.617 4.617
4.617 5.764
5.764 5.764
5.764
In Transit Projected on Hand
16.628 10.851
29.732 23.955
18.178 13.561
8.944 28.985
24.368 19.751
13.987 8.223
27.117 21.353
Planned Shipment-Receipt Date
24.658 24.658
24.658
Planed Shipments - Ship Date
24.658 24.658
24.658
Past Due Week
27 28
29 30
31 32
33 34
35 36
37 38
39 Demand Forecast
4.643 4.643
4.643 4.643
4.643 5.819
5.819 5.819
5.819 5.822
5.822 5.822
5.822
In Transit Projected on Hand
21.512 16.869
12.226 7.583
27.718 23.075
17.256 11.437
30.396 24.577
18.755 12.933
7.111 26.067
Planned Shipment-Receipt Date
24.778 24.778
24.778
Planed Shipments - Ship Date
24.778 24.778
24.778
Past Due Week
40 41
42 43
44 45
46 47
48 49
50 51
52 Demand Forecast
4.661 4.661
4.661 4.661
4.661 5.829
5.829 5.829
5.829 5.832
5.832 5.832
5.832
In Transit Projected on Hand
26.067 21.406
16.745 12.084
7.423 27.540
21.711 15.882
10.053 29.002
23.170 17.338
11.506 5.674
Planned Shipment-Receipt Date
24.778 24.778
Planed Shipments - Ship Date
24.778 24.778
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Pada Tabel 5.18 sampai Tabel 5.21 dapat dilihat DRP worksheet pada setiap supplier dimana memperlihatkan sistem kegiatan perencanaan dan
penjadwalan distribusi di supplier yang didasarkan pada peramalan. DRP worksheet dilakukan untuk memperlihatkan secara detail dan jelas
jumlah permintaan, safety stock, order quantity dan lead time. Order quantity merupakan jumlah pengiriman produk yang optimal dan safety stock merupakan
titik acuan pemesanan kembali produk.
5.2.7. Pegging Information
