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STABILITAS KAPAL
DWA,OVER LOADED DAN
SARAT TOLAK
Oleh : agi subakti
SOAL (TUGAS KELOMPOK)
• Sebuah kapal tiba di pelabuhan tropis dingan Bj : 1.018 t/cm3 ,sarat depan saat itu
8.00M dan sarat belakang 8.50M.serta KG=8.15M.dari data stability booklet
didapatkan:
• -pada sarat 8.00M,displacement=17,385 Tons.TPC=24.7t/cm
• -pada sarat 8.50M,displacement=18,624 Tons.TPC=25.0t/cm
• -summer draft 9.47M,displacement=21,081 Tons.TPC=25.6t/cm KM=8.96 M
• Dipelabuhan tersebut kapal melakukan kegiatan pemuatan hingga sarat maksimum
yang diinginkan yang mana muatan tersebut akan di tempatkan di UTD dengan
KG=7.15M dan diatas deck dengan KG=11.25M.
• Bila KM yang didapat setelah selesai pemadatan=9.015M dan GM ahir=0.85M
dimana operating load selama pelayaran disungai=32Tons.tentukan:
• A)Berat muatan dimasing masing tempat(UTD dan On Deck)
• B)Sarat rata rata ahir sewaktu kapal selesai pemadatan?
3
MENCARI BERAT MUATAN YANG DAPAT DIMUAT?
• Muatan Yang dapat ditamabah =
Pertambahan Draft x TPC
• W = δ Draft x TPC
• δ Draft=jarak mean draft ke S + S
ke T + DWA + over load
• S-T = (1/48) x Summer Draft
• DWA = FWA X ( δsw-δdw / δsw-δfw)
FWA = Δ Summer
40xTPC summer
• δ Draft over load= operating load
TPC summer DW
W
S
9.25M
F
T
FWA DWA
8.25M
?
?
?
WL δ= 1.018
Over load?
4
TPCDW = TPCSw x δdw /δsw
= 25.6 x 1.018 / 1.025
= 25.42 T/CM
• Mean Draft-S = 9.47 – 8.25
= 1.22 M / 122CM
• S-T = (1/48) x 9.47 =
0.197M / 19.7 CM
• FWA = 21081 / 40 x 25.6
21081/1024
= 20.58 CM
• DWA = 20.58 x ( 1.025-
1.018 / 1.025-1.000 ) =
20.58x0.28 = 5.762 CM
• Over load= 32/25.42
= 1.25cm
• δ Draft = 122+19.7+5.762+1.25
= 148.71 CM
W
S
9.47M
F
T
FWA DWA
8.25M
122cm
19.7cm
5.76cm
WL δ= 1.018
MENCARI PERTAMBAHAN DRAFT
Over load = 1.25cm
5
TOTAL MUATAN YANG DAPAT DIMUAT
• W = δ Draft x TPC
• W(mean draft-summer draft) =
δ Draft x TPC dw mean
= 122 x 25.05 = 3056.1 T
W(S-T) = δ Draft x TPCsum dw
= 19.73 x 25.425
= 501 T
W(DWA) = 5.76 x 25.425
= 146.4 T
TOTAL CARGO = 3056.1 + 501 +
146.4 + 32
= 3736 T
W
S
9.25M
F
T
FWA DWA
8.25M
W?
W?
W?
WL δ= 1.018
W=32 t
MENCARI BERAT MUATAN YANG AKAN DIMUAT DI UTD DAN ON DECK
?
?
W
K
K
KG=11.15M
KG=7.15M
• Untuk mengetahui berat muatan masing masing
di UTD dan On Deck,maka menggunakan Rumus
:
• KG ahir = (Σmoment / Σw)
• KG ahir = KM ahir - GM ahir
• KG ahir = 9.015 – 0.85
• = 8.165
• 8.165 = (Σmoment / Σw)
3736 T
• W KG Momen
• (Δ) 17881 8.15 145734.15
• X 11.25 11.25x
• 3736-x 7.15 26712.4 – 7.15x
• 21617. 172442.55 + 4.1x
• KG ahir = (Σmoment / Σw)
• 8.165 = 172442.55 + 4.1x / 21617
• 8.165 x 21617 = 172442.55+ 4.1x
• 176502.805 = 172442.55 + 4.1x
• X = 176502.805 – 17442.55 / 4.1
• =4060.225 / 4.1 = 990.3
• X2 = 3745 – 990.3 = 2745.7
• (Δ) = Δmean = 18624 + 17385 / 2
• = 36009 / 2 = 18004.5
• Δdw = Δmean x 1.018 / 1.025
• = 18004.5 x 1.018
• 1.025
• = 17881.5 ton
TOTAL BERAT MUATAN YANG DIMUAT DI UTD DAN ON DECK & DRAFT AHIR
X1
K
KG=11.25
• Total Cargo On Deck (X1) = 990.3 Tons
• Total Cargo di UTD (X2) = 2745.7 Tons
• Sarat rata-rata ahir = Mean Draft sebelum muat + δ Draft
• = 8.25M + 1.487 M
• = 9.73 M
X2
Cargo On Deck= 990.3 T
Cargo UTD = 2745.7 T
KG=11.25
8.25M
δ= 1.018
δ Draft = 1.487 M
9.73M /draft ahir
BEST REGARDS

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Stability DWA and over loaded

  • 1. STABILITAS KAPAL DWA,OVER LOADED DAN SARAT TOLAK Oleh : agi subakti
  • 2. SOAL (TUGAS KELOMPOK) • Sebuah kapal tiba di pelabuhan tropis dingan Bj : 1.018 t/cm3 ,sarat depan saat itu 8.00M dan sarat belakang 8.50M.serta KG=8.15M.dari data stability booklet didapatkan: • -pada sarat 8.00M,displacement=17,385 Tons.TPC=24.7t/cm • -pada sarat 8.50M,displacement=18,624 Tons.TPC=25.0t/cm • -summer draft 9.47M,displacement=21,081 Tons.TPC=25.6t/cm KM=8.96 M • Dipelabuhan tersebut kapal melakukan kegiatan pemuatan hingga sarat maksimum yang diinginkan yang mana muatan tersebut akan di tempatkan di UTD dengan KG=7.15M dan diatas deck dengan KG=11.25M. • Bila KM yang didapat setelah selesai pemadatan=9.015M dan GM ahir=0.85M dimana operating load selama pelayaran disungai=32Tons.tentukan: • A)Berat muatan dimasing masing tempat(UTD dan On Deck) • B)Sarat rata rata ahir sewaktu kapal selesai pemadatan?
  • 3. 3 MENCARI BERAT MUATAN YANG DAPAT DIMUAT? • Muatan Yang dapat ditamabah = Pertambahan Draft x TPC • W = δ Draft x TPC • δ Draft=jarak mean draft ke S + S ke T + DWA + over load • S-T = (1/48) x Summer Draft • DWA = FWA X ( δsw-δdw / δsw-δfw) FWA = Δ Summer 40xTPC summer • δ Draft over load= operating load TPC summer DW W S 9.25M F T FWA DWA 8.25M ? ? ? WL δ= 1.018 Over load?
  • 4. 4 TPCDW = TPCSw x δdw /δsw = 25.6 x 1.018 / 1.025 = 25.42 T/CM • Mean Draft-S = 9.47 – 8.25 = 1.22 M / 122CM • S-T = (1/48) x 9.47 = 0.197M / 19.7 CM • FWA = 21081 / 40 x 25.6 21081/1024 = 20.58 CM • DWA = 20.58 x ( 1.025- 1.018 / 1.025-1.000 ) = 20.58x0.28 = 5.762 CM • Over load= 32/25.42 = 1.25cm • δ Draft = 122+19.7+5.762+1.25 = 148.71 CM W S 9.47M F T FWA DWA 8.25M 122cm 19.7cm 5.76cm WL δ= 1.018 MENCARI PERTAMBAHAN DRAFT Over load = 1.25cm
  • 5. 5 TOTAL MUATAN YANG DAPAT DIMUAT • W = δ Draft x TPC • W(mean draft-summer draft) = δ Draft x TPC dw mean = 122 x 25.05 = 3056.1 T W(S-T) = δ Draft x TPCsum dw = 19.73 x 25.425 = 501 T W(DWA) = 5.76 x 25.425 = 146.4 T TOTAL CARGO = 3056.1 + 501 + 146.4 + 32 = 3736 T W S 9.25M F T FWA DWA 8.25M W? W? W? WL δ= 1.018 W=32 t
  • 6. MENCARI BERAT MUATAN YANG AKAN DIMUAT DI UTD DAN ON DECK ? ? W K K KG=11.15M KG=7.15M • Untuk mengetahui berat muatan masing masing di UTD dan On Deck,maka menggunakan Rumus : • KG ahir = (Σmoment / Σw) • KG ahir = KM ahir - GM ahir • KG ahir = 9.015 – 0.85 • = 8.165 • 8.165 = (Σmoment / Σw) 3736 T
  • 7. • W KG Momen • (Δ) 17881 8.15 145734.15 • X 11.25 11.25x • 3736-x 7.15 26712.4 – 7.15x • 21617. 172442.55 + 4.1x • KG ahir = (Σmoment / Σw) • 8.165 = 172442.55 + 4.1x / 21617 • 8.165 x 21617 = 172442.55+ 4.1x • 176502.805 = 172442.55 + 4.1x • X = 176502.805 – 17442.55 / 4.1 • =4060.225 / 4.1 = 990.3 • X2 = 3745 – 990.3 = 2745.7 • (Δ) = Δmean = 18624 + 17385 / 2 • = 36009 / 2 = 18004.5 • Δdw = Δmean x 1.018 / 1.025 • = 18004.5 x 1.018 • 1.025 • = 17881.5 ton
  • 8. TOTAL BERAT MUATAN YANG DIMUAT DI UTD DAN ON DECK & DRAFT AHIR X1 K KG=11.25 • Total Cargo On Deck (X1) = 990.3 Tons • Total Cargo di UTD (X2) = 2745.7 Tons • Sarat rata-rata ahir = Mean Draft sebelum muat + δ Draft • = 8.25M + 1.487 M • = 9.73 M X2 Cargo On Deck= 990.3 T Cargo UTD = 2745.7 T KG=11.25 8.25M δ= 1.018 δ Draft = 1.487 M 9.73M /draft ahir