excel trb 2

KelompokSoftware

Kriteria Umum:

1 Recommended Practice2 Material Struktur3 Tipe Platform4 Jumlah kaki jacket5 Kedalaman perairan (LWL) feet6 Orientasi Platform

Kriteria Desain Deck:

1 Jumlah deck:2 Luasan Deck:

Luasan Sub cellar deckLuasan Cellar deckLuasan Main deckLuasan Cooler deck

3 a. Beban Hidup Area Deck Kondisi Operasi Sub cellar deck psfCellar deck psfMain deckpsfCooler deck

b. Beban Hidup Area Deck Kondisi Badai Sub cellar deckCellar deckMain deckCooler deck

4 Jumlah crane5 a. Beban Crane Kondisi Operasi

Beban vertikalBeban momen

b. Beban Crane Kondisi BadaiBeban vertikalBeban momen

6 Beban AnginKondisi OperasiKondisi Badai

7 Beban PerpipaanMain DeckCellar DeckMezanine deck

Sub cellar deck8 Helideck

TypeRules

9 Work over rig (WOR)Dead load Normal cond.Dead load Extreem cond.

Operating Load Normal

Operating Extreem NormalKriteria Desain Jacket

1 a. Beban Gelombang & Arus Kondisi OperasiTinggi gelombang significantPeriode gelombangTotal pasang surutKecepatan arus (permukaan)Kecepatan arus (dasar laut)

b. Beban Gelombang & Arus Kondisi BadaiTinggi gelombang maksimumPeriode gelombangTotal pasang surutKecepatan arus (permukaan)Kecepatan arus (dasar laut)Storm surge

2 Marine GrowthMenambah OD tubular member

3 Corrotion Allowance4 Hydrodynamic Coefficient5 Shielding Effect Coefficient6 Blockage Factor 7 Scouring Effect Tollerance8 Riser

JumlahDiameter luarKetebalan

8 ConductorJumlahDiameter luarKetebalan

9 Data Tanah10 Bater11 Barge bumper

7SACS

API RP 2A-LRFD, AISC ASDASTM

well head & Production4

150

2 deck

-

-

-120100

-

-90 psf

80-2

135,0 kips19500,0 kips-in

65,5 kips0,0 kips-in

45 mph75 mph

35 psf25 psf

-

1Boeing

API RP 2L

285 kips285 kips285kips

(+) 60,00

6750 ft2

8000 ft2

0 kips

18,7 ft7,5 det4,5 ft

1,93 knot0,54 knot

30,5 ft9,9 det4,6 ft

2,47 knot0,69 knot

1 ft

3 inchAPI RP 2A-LRFDAPI RP 2A-LRFDAPI RP 2A-LRFDAPI RP 2A-LRFD

3 ft

618''

0,75"

818''

0,75"A

1 : 8 XYZ1

Kelompok 1 sampai 10I. SUBCELLAR DECK

No Deskripsi Jumlah Berat (Kip)

1 Duplex fuel filter 1 5.002 Pig launcher 1 5.593 Slop pump 2 2.694 Sea water lift pump 3 6.725 Slop tank 1 6.72

I. CELLAR DECK

No. Description Jumlah Berat (Kip)

1 Gas Cooler 1 15.682 Emergency generator 1 20.163 Battery box 2 1.794 Vertical separators 2 36.775 Maintenance building 1 44.806 Switch gear 1 7.847 Switch gear building 1 5.048 Switch gear building 1 6.729 Diesel fuel tank 1 58.24

10 Toilet 1 2.2411 Transformer-1 1 92.0012 Transformer-2 1 12.0013 Vertical air receiver 1 1.20

II. MAIN DECK

No. Description Jumlah Berat (Kip)

1 Battery box 2 1.792 Air compressor package 1 3.363 Load break switch 1 1.194 Container room-1 1 23.525 Container room-2 1 23.526 Process control room 1 9.247 Transformer 3 19.238 Instrument storage 1 5.609 Fresh water tank 1 7.09

10 Air receiver 1 1.2011 Ansul drum chemical skid 1 2.4712 Mechanical storage 1 7.8413 Life capsule 1 2.6914 Communication microwave 1 5.3815 Communication tower 1 17.9216 Fuel tank 1 13.4417 Power instrument storage 1 4.4418 Toilet 1 2.2419 Flare bridge 1 …

1 sampai 10

Ukuran

OD 2' x 2'-6''OD 2' x 7'-0''

9'-4'' x 3'-6'' x 2'-4''9'-4'' x 3'-6'' x 2'-4''6'-0'' x 4'-0'' x 3'-6''

Ukuran

OD 38'' x 20'-0''22'-0'' x 9'-0'' x 10'-11''

2'-3'' x 2'-3'' x 1'-9''OD 54'' x 8'-4''

12'-3'' x 6'-4'' x 8'-0''5'-0'' x 2'-2'' x 8'-10''

26'-0'' x 24'-0'' x 14'-0''7'-0'' x 18'-0'' x 13'-6''

10'-0'' x 10'-0'' x 10'-0''4'-0'' x 6'-0'' x 8'-0''

16'-6' x 12'-10'' x 12'-0''9'-0'' x 5'-0'' x 6'-9''

OD 38'' x 6'-4''

Ukuran

2'-3'' x 2'-1' x 1'-9''5'-8'' x 3'-6'' x 6'-0''4'-6'' x 2'-5'' x 6'-5''

34'-0'' x 10'-0'' x 20'-0'34'-0'' x 10'-0'' x 20'-0'16'-0'' x 14'-0'' x 12'-0''

12'-6'' x 8'-0'' x 8'-0''8'-0'' x 6'-8'' x 6'-6''

11'-6'' x 8'-0'' x 10'-0''OD 36'' x 75''

9'-3'' x 5'-2'' x 4'-5''8'-2'' x 8'-1'' x 8'-9''

…10'-4'' x 10'-0'' x 9'-10''

10'-5'' x 10'-5'' x 100'-0''5'-7'' x 4'-5'' x 4'-7''8'-2'' x 8'-2'' x 9'-0''5'-0'' x 4'-0'' x 8'-0''

…

I. CELLAR DECK

No. Description Jumlah Berat (Kip) Luas

1 Gas Cooler 1 15.68 94.82

2 Emergency generator 1 20.16 198.00

3 Battery box 2 1.79 5.06

4 Vertical separators 2 36.77 15.90

5 Maintenance building 1 44.80 77.58

6 Switch gear 1 7.84 10.83

7 Switch gear building 1 5.04

8 Switch gear building 1 6.72 126.00

9 Diesel fuel tank 1 58.24 100.00

10 Toilet 2 2.24 24.00

11 Transformer-1 1 92.00 198.00

12 Transformer-2 1 12.00

13 Vertical air receiver 1 1.20 7.87

II. MAIN DECK



2 Air compressor package 1 3.36 19.83

3 Load break switch 1 1.19 10.88

4 Container room-1 1 23.52 340.00

5 Container room-2 1 23.52

6 Process control room 1 9.24 224.00

7 Transformer 3 19.23 100.00

8 Instrument storage 1 5.60 53.33

9 Fresh water tank 1 7.09 92.00

10 Air receiver 1 1.20 7.07

11 Ansul drum chemical skid 1 2.47 47.79

12 Mechanical storage 1 7.84 66.01

13 Life capsule 1 2.69 50.24

14 Communication microwave 1 5.38 103.33

15 Communication tower 1 17.92 108.51

16 Fuel tank 1 13.44 24.66

17 Power instrument storage 1 4.44 66.69

18 Toilet 2 2.24 20.00

19 Flare bridge 1 … 0.00

UkuranX Y Z

Feet Inch Feet Inch Feet InchOD 38'' x 20'-0'' 38 20

22'-0'' x 9'-0'' x 10'-11'' 22 9 10 112'-3'' x 2'-3'' x 1'-9'' 2 3 2 3 1 9

OD 54'' x 8'-4'' 54 8 412'-3'' x 6'-4'' x 8'-0'' 12 3 6 4 85'-0'' x 2'-2'' x 8'-10'' 5 2 2 8 10

26'-0'' x 24'-0'' x 14'-0'' 26 24 147'-0'' x 18'-0'' x 13'-6'' 7 18 13 6

10'-0'' x 10'-0'' x 10'-0'' 10 10 104'-0'' x 6'-0'' x 8'-0'' 4 6 8

16'-6' x 12'-10'' x 12'-0'' 16 6 12 10 129'-0'' x 5'-0'' x 6'-9'' 9 5 6 9

OD 38'' x 6'-4'' 38 6 4

UkuranX Y Z

Feet Inch Feet Inch Feet Inch2'-3'' x 2'-1' x 1'-9'' 2 3 2 1 1 95'-8'' x 3'-6'' x 6'-0'' 5 8 3 6 64'-6'' x 2'-5'' x 6'-5'' 4 6 2 5 6 5

34'-0'' x 10'-0'' x 20'-0' 34 10 2034'-0'' x 10'-0'' x 20'-0' 34 10 2016'-0'' x 14'-0'' x 12'-0'' 16 14 12

12'-6'' x 8'-0'' x 8'-0'' 12 6 8 88'-0'' x 6'-8'' x 6'-6'' 8 6 8 6 6

11'-6'' x 8'-0'' x 10'-0'' 11 6 8 10OD 36'' x 75'' 36 75

9'-3'' x 5'-2'' x 4'-5'' 9 3 5 2 4 58'-2'' x 8'-1'' x 8'-9'' 8 2 8 1 8 9

…

10'-4'' x 10'-0'' x 9'-10'' 10 4 10 910'-5'' x 10'-5'' x 100'-0'' 10 5 10 5 100

5'-7'' x 4'-5'' x 4'-7'' 5 7 4 5 4 78'-2'' x 8'-2'' x 9'-0'' 8 2 8 2 95'-0'' x 4'-0'' x 8'-0'' 5 4 8

…

Panjang (feet) Lebar (feet) Tinggi (feet)

3.17 0.00 20.00 15.6822.00 9.00 10.92 20.162.25 2.25 1.75 3.584.50 0.00 8.33 73.54

12.25 6.33 8.00 44.85.00 2.17 8.83 7.84

26.00 24.00 14.007.00 18.00 13.50 6.72

10.00 10.00 10.00 58.244.00 6.00 8.00 4.48

16.50 12.00 12.00 929.00 5.00 6.753.17 0.00 6.33 1.2

Σ 328.24

Panjang (feet) Lebar (feet) Tinggi (feet)

2.25 2.08 1.75 3.585.67 3.50 6.00 3.364.50 2.42 6.42 1.19

34.00 10.00 20.00 23.5234.00 10.00 20.0016.00 14.00 12.00 9.2412.50 8.00 8.00 57.698.00 6.67 6.50 5.6

11.50 8.00 10.00 7.0933.00 0.00 6.25 1.29.25 5.17 4.42 2.4728.17 8.08 8.75 7.848.00 2.69

10.33 10.00 9.00 5.3810.42 10.42 100.00 17.925.58 4.42 4.58 13.448.17 8.17 9.00 4.4435.00 4.00 8.00 4.48

Σ 171.138

Berat Total

Berat Total

HELI DECK

Helicopter Gross Weight Rotor Diameter Overall Length

Model Name lbs kg ft m ft

Boeing Vertol BO-105C 5070 2300 32.2 9.8 38.8

Overall LengthType

Number Fore Aft

m Fore Aft In^2 cm^2 In^2

11.8 Skid - - - - -

AM3

user: Contact Area Per

Aft Precentafe of Gross Weight Per Distance Between Fore and Aft Gears

cm^2 Fore Aft ft m

- - - - -

AO3

user: Contact Area Per

Width Between Gears

ft m

8.5 2.6

AJISAKA PLATFORMkelompok 7

PERHITUNGAN COG REV NO: 6

CELLAR DECK

No. DescriptionX Y Berat

Berat * X Berat * Y(ft) (ft) (kip)

1 Gas Cooler 2.32 32.51 15.68 36.38 509.762 Emergency generator -0.55 -32.5 20.16 -11.09 -655.20

3a Battery box 13.83 -12.5 1.79 24.76 -22.383b Battery box 13.97 -17.47 1.79 25.01 -31.274a Vertical separators -22.5 22.5 36.77 -827.33 827.334b Vertical separators -22.5 12.5 36.77 -827.33 459.635 Maintenance building 22.5 21.49 44.80 1008.00 962.756 Switch gear 23.5 -4.55 7.84 184.24 -35.677 Vertical air receiver 14.66 -32.65 1.20 17.59 -39.188 Switch gear building 3.35 6.72 0.00 22.519 Diesel fuel tank -22.5 -21.5 58.24 -1310.40 -1252.16

10a Toilet 36.88 17.6 2.24 82.61 39.4210b Toilet -31.34 -38.98 2.24 -70.20 -87.3211 Transformer-1 25 -16.89 92.00 2300.00 -1553.88

328.24 632.24 -855.661.93 -2.61

COG LOCATION(ft)

x = 632.24 = 1.93328.24

y = -855.66 = -2.61328.24

∑ TOTAL

Tributary Area

Cellar Deck

Luas (ft2)Equipment

1 2 3a 3b 4a 4b 5 6

Sec

ond

ary

Gir

der

12 17.7603 17.760 12.9304 7.950 12.9305 7.950 12.9306 5.4157891011 5.06012 5.0601314 49.50015 49.50016

Beban (Kip)Equipment

1 2 3a 3b 4a 4b 5 6

Sec

ond

ary

Gir

der

12 3.9203 3.920 7.4674 18.385 7.4675 18.385 7.4676 3.9207891011 1.7912 1.7901314 5.0415 5.04016

Luas (ft2)Equipment

1 2 3a 3b 4a 4b 5 6M

ain

Gir

der 1 35.521

2 99.0003 7.950 7.9504 38.790 5.415

Beban (kip)Equipment

1 2 3a 3b 4a 4b 5 6

Mai

n G

irde

r 1 7.8402 10.0803 18.385 18.3854 22.400 3.920

Main DeckEquipment

1a 1b 2 3 4 5a 5b 6

Sec

ond

ary

Gir

der

1234 10.505567891011 28.00012 28.00013 28.00014 28.00015 4.690 4.690 85.00016 85.00017 10.88018 19.830 10.50519

Beban (Kip)Equipment

1a 1b 2 3 4 5a 5b 6

Sec

ond

ary

Gir

der

1234 21.090

Sec

ond

ary

Gir

der

567891011 1.15512 1.15513 1.15514 1.15515 1.790 1.790 5.8816 5.8817 1.19018 3.360 21.09019

Luas (ft2)Equipment

1a 1b 2 3 4 5a 5b 6

Mai

n G

irde

r 12 85.0003 85.000 10.5054 10.505 112.000

Beban (kip)Equipment

1a 1b 2 3 4 5a 5b 6

Mai

n G

irde

r 12 5.8803 5.880 21.0904 21.090 4.620

EquipmentNo.

7 8 9 10a 10b 111

2

3

8.000 4

8.000 5

15.750 8.000 6

15.750 7

15.750 8

15.750 9

24.750 10

24.750 11

16.660 24.750 12

16.660 24.750 13.7

16.66012.00012.000

Equipment Σ Σ7 8 9 10a 10b 11 Beban (Kip) Beban (Kip/ft)

0.000 0.000003.920 0.04900

11.387 0.142330.747 26.598 0.332480.747 26.598 0.33248

0.840 0.747 5.507 0.068830.840 0.840 0.010500.840 0.840 0.010500.840 0.840 0.01050

11.500 11.500 0.1437511.500 13.290 0.16613

9.703 11.500 22.993 0.287419.703 11.500 21.203 0.265039.703 14.743 0.18428

1.12 6.160 0.077001.120 1.120 0.01400

Equipment

7 8 9 10a 10b 11

7.87050.000

63.000 99.000

Equipment Σ Σ7 8 9 10a 10b 11 Beban (Kip) Beban (Kip/ft)

7.840 0.09801.200 11.280 0.1410

29.120 65.890 0.77523.360 46.000 75.680 0.8904

Equipment7a 7b 7c 8 9 10 11 12

26.660 23.895 33.005

7.070

25.000 25.00025.000 25.000 25.000

25.000 23.00023.000


2.799 1.236 3.920

1.200

4.808 4.8084.808 4.808 4.808

4.808 1.7731.773


26.660 11.940 16.50250.000 25.000

46.000 11.94025.000 50.000 16.502


2.799 0.618 1.9609.615 4.808

3.547 0.6184.808 9.615 1.960

Description Jumlah Berat (Kip) Luas (ft2)

Gas Cooler 1 15.68 71.04

Emergency generator 1 20.16 198.00

Battery box 2 1.79 5.06

Vertical separators 2 36.77 15.90

Maintenance building 1 44.80 77.58

Switch gear 1 7.84 10.83

Switch gear building 1 5.04

Switch gear building 1 6.72 126.00

Diesel fuel tank 1 58.24 100.00

Toilet 2 2.24 24.00

Transformer-1 1 92.00 198.00

Transformer-2 1 12.00

Vertical air receiver 1 1.20 7.87

Equipment13 14 15a 15b 16 17

12.330 33.34510.00010.000

34.440 20.00034.440

50.260 34.440

Equipment13 14 15a 15b 16 17

6.720 2.2221.121.12

1.793 2.2401.793

2.690 1.793

Equipment13 14 15a 15b 16 17

12.330 33.345

Equipment13 14 15a 15b 16 17

6.72 2.2215

EquipmentWork Over Rig Left Work Over Rig Right

52.500 52.50052.500 52.50052.500 52.500

Equipment ΣWork Over Rig Left Work Over Rig Right Beban (Kip)

0.0000.0000.000

21.090

16.8971.120

47.500 47.500 96.12047.500 47.500 95.00047.500 47.500 95.000

0.0001.1551.1552.3551.155

19.07520.30311.80428.016

4.483

EquipmentWork Over Rig Left Work Over Rig Right

157.500157.500

Equipment ΣWork Over Rig Left Work Over Rig Right Beban (Kip)

14.31920.303

142.500 173.634142.500 184.592



2 Air compressor package 1 3.36 19.83

3 Load break switch 1 1.19 10.88

4 Container room-1 1 23.52 340.00

5 Crane 2 42.17 21.01

6 Process control room 1 9.24 224.00

7 Transformer 3 19.23 100.00

8 Instrument storage 1 5.60 53.33

9 Fresh water tank 1 7.09 92.00

10 Air receiver 1 1.20 7.07

11 Ansul drum chemical skid 1 2.47 47.79

12 Mechanical storage 1 7.84 66.01

13 Life capsule 1 2.69 50.26

14 Communication microwave 1 5.38 103.33

15 Toilet 2 2.24 20.00

16 Fuel tank 1 13.44 24.66

17 Power instrument storage 1 4.44 66.69

18 Work Over Rig 1 285.00 315.00

ΣBeban (Kip/ft)

0.000000.000000.000000.26363

0.211210.014001.201501.187501.187500.000000.014440.014440.029440.014440.238440.253780.147550.350210.05604

ΣBeban (Kip/ft)

0.1790.2541.7361.846

pound-force per square inch (lbf/in², psi)

kip per square inch (ksi, kip/in²)

kip or kip-force, or kilopound (kip, klb, kipf)

1 ksi = 1000 psi1 psf = 1 /144

0.00694 psi1 psf = 1000 / 144

6.94444 ksikip 1000 lblb/f 0,001/12

8.3E-05 kip/in

Plate

Secondary Girder

Main Girder

Secondary Girder - Cellar Deck

Setelah didapat penyebaran beban pada tributary maka diambil secondary girder yang mendapatkan beban terberat sebagai acuan profile secondaryyaitu Secondary Girder 4

Beban Pada Secondary Girder 4

Equipment W (kip)Vertical Separator 36.77 15.90

Maintenance Building 44.80 77.58

Gambar Pembebanan

45 feet

Equipment Beban per satuan panjang (kip/ft) l (ft)Vertical Separator 3.677 45Maintenance Building 1.180 45

P.Girder 45 ft540 in

Luas Span 225 ft2

Momen LainNama Beban W (psf) Luas Span

Beban Hidup 120.0 225Beban Perpipaan 25.0 225Beban Plat 4.5 225

Total Momen yang diterima pada secondry girder adalah

A (ft2)

Mmax 2220.133 Kip.in

Gambar Pembebanan

Menghitung Tegangan IzinMenggunakan AISC ASD Part 5tegangan izin sesuai AISC ASD

tegangan izin baja =

tegangan izin sesuai AISC ASD =

=

Menghitung Modulus Penampang Sxx =

=

Menentukan Properties BahanDari AISC ASD Tabel W shape halaman 1-10 sd 1-32, didapatkan baja dengan Sxx min:W 14 x 68 Sxx =

W =

q =

Check Properties σ =

=

=

Check <

21.5546885234031

(Memenuhi)

σy

σa

σperhitungan

Setelah didapat penyebaran beban pada tributary maka diambil secondary girder yang mendapatkan beban terberat sebagai acuan profile secondary

Luasan yang diterima Beban Terdistribusi (kip) Panjang Equipment (ft)7.950 18.385 5

12.930 7.467 6.33

a Mx (Kip-ft) Mx (Kip-in)5 39.437 473.244

6.33 19.433 233.202Σ 706.445

Beban (lb) Beban per satuan panjang (lb/ft) Beban per satuan panjang (kip/in)27000.00 600.000 0.055625.00 125.000 0.01041666666666671012.50 22.500 0.001875

45 feet

36 ksi

ksi21.6 ksi

M max

102.78 in³

Dari AISC ASD Tabel W shape halaman 1-10 sd 1-32, didapatkan baja dengan Sxx min:103 in³

68 lb/ft

0.068 kip / feet

M max

S

2220.133

103

21.5546885234031

21.6

σy x 0.60

in3

σa

σijin

Beban per satuan panjang (kip/ft)3.6771.180

Mx (kip-in)1215

253.12545.5625

Secondary Girder - Main Deck

Setelah didapat penyebaran beban pada tributary maka diambil secondary girder yang mendapatkan beban terberat sebagai acuan profile secondaryyaitu Secondary Girder 9


Equipment W (kip)Work Over Rig Left 285.00 315.00

Work Over Rig Right 285.00 315.00

Gambar Pembebanan

45 feet

Equipment Beban per satuan panjang (kip/ft) l (ft)Work Over Rig Left 1.910 45Work Over Rig Right 1.910 45


Luas Span 225 ft2



Total Momen yang diterima pada secondry girder adalah

A (ft2)

Mmax 6730.741 Kip.in

Gambar Pembebanan




=


=


W =

q =


=

=

Check <

20.9680407209613

(Memenuhi)

σy

σa

σperhitungan

Setelah didapat penyebaran beban pada tributary maka diambil secondary girder yang mendapatkan beban terberat sebagai acuan profile secondary

Luasan yang diterima Beban Terdistribusi (kip) Panjang Equipment (ft)47.500 42.976 22.547.500 42.976 22.5

a Mx (Kip-ft) Mx (Kip-in)22.5 221.596 2659.15222.5 221.596 2659.152

Σ 5318.304


45 feet

36 ksi

ksi21.6 ksi

M max

311.61 in³

Dari AISC ASD Tabel W shape halaman 1-10 sd 1-32, didapatkan baja dengan Sxx min:321 in³

230 lb/ft

0.23 kip / feet

M max

S

6730.741

321

20.9680407209613

21.6

σy x 0.60

in3

σa

σijin


Mx (kip-in)1012.5

354.37545.5625


Setelah didapat penyebaran beban pada tributary maka diambil main girder yang mendapatkan beban terberat sebagai acuan profile mainyaitu main Girder 4


Equipment W (kip)Maintenance Building 44.80 77.58Switch Gear 7.84 10.83Switch Gear Building 6.72 126.00

Transformer 92.00 198.00

Gambar Pembebanan

12 ft 2 ft

5 ft 3 ft65 feet

Equipment Beban per satuan panjang (kip/ft) l (ft)Maintenance Building 1.867 65Switch Gear 1.960 65Switch Gear Building 0.187 65Transformer 2.788 65


Luas Span 2600 ft2

Momen Akibat Secondary Girder

A (ft2)

Panjang Main Girder 65 ftBerat Secondary Girder 68 lb/ft

Reaksi Tumpuan = q.L2

= 2210

a b M (Pa2b/L2)5 60 9415.38

10 55 15823.0815 50 19615.3820 45 21184.6225 40 20923.0830 35 19223.0835 30 16476.9240 25 13076.9245 20 9415.3850 15 5884.6255 10 2876.9260 5 784.62

Σ 154700.00Σ 154.70



Total Momen yang diterima pada secondry girder adalahMmax 28096.715 Kip.in

Gambar Pembebanan




=


=


W =q =


=

=

Check <

20.8123815937149

(Memenuhi)

σy

σa

σperhitungan

Setelah didapat penyebaran beban pada tributary maka diambil main girder yang mendapatkan beban terberat sebagai acuan profile main

Luasan yang diterima Beban Terdistribusi (kip) Panjang Equipment (ft)38.79 22.400 125.415 3.920 2

63.000 3.360 1899.000 46.000 16.5

16,5 Ft

18 Ft

3 ft 7,5 ft

x Mx (Kip-ft) Mx (Kip-in)5 -377.222 -4526.667

20 191.917 2303.00020 18.278 219.33341 390.071 4680.848

Σ 2676.515

kip.in


65 feet

36 ksi

ksi21.6 ksi

M max

1300.77 in³

1350 in³387 lb/ft

0.387 kip / feet

M maxS

28096.7151350

20.8123815937149

21.6

σy x 0.60

in3

σa

σijin

Beban per satuan panjang (kip/ft)1.8671.9600.1872.788

Mx (kip-in)202804225760.5


Setelah didapat penyebaran beban pada tributary maka diambil main girder yang mendapatkan beban terberat sebagai acuan profile mainyaitu main Girder 4

Beban Pada Main Girder 4

Equipment W (kip)Transformer (7b) 19.23 100.00Proses Control Room 9.24 224.00Work Over Rig Right 285.00 315.00

Mechanical Storage 7.84 66.01

Gambar Pembebanan

60 feet

Equipment Beban per satuan panjang (kip/ft) l (ft)Transformer (7b) 0.601 60Proses Control Room 0.330 60Work Over Rig Right 10.179 60Mechanical Storage 0.245 60


Luas Span 2400 ft2

Panjang Main Girder 60 ftBerat Secondary Girder 230 lb/ft

A (ft2)

Reaksi Tumpuan = q.L2

= 6900

a b M (Pa2b/L2)5 55 28989.58

10 50 47916.6715 45 58218.7520 40 61333.3325 35 58697.9230 30 51750.0035 25 41927.0840 20 30666.6745 15 19406.2550 10 9583.3355 5 2635.42

Σ 411125.00Σ 411.13



Total Momen yang diterima pada secondry girder adalahMmax 21974.991 Kip.in

Gambar Pembebanan

65 feet




=


σy

σa

=


W =q =


=

=

Check <

21.5441092927017

(Memenuhi)

σperhitungan

Setelah didapat penyebaran beban pada tributary maka diambil main girder yang mendapatkan beban terberat sebagai acuan profile main

Luasan yang diterima Beban Terdistribusi (kip) Panjang Equipment (ft)25 4.808 8

112 4.620 14157.500 142.500 1416.502 1.960 8

x Mx (Kip-ft) Mx (Kip-in)8 15.982 191.787

35.5 44.509 534.10513 55.982 671.7868 6.516 78.189

Σ 1475.866

kip.in


36 ksi

ksi21.6 ksi

M max

σy x 0.60

in3

1017.36 in³

1020 in³291 lb/ft

0.291 kip / feet

M maxS

21974.9911020

21.5441092927017

21.6

σa

σijin


10.1790.245

Mx (kip-in)144005040648

Plate Thickness t (in) W (psf)Cellar Deck 5/16 4.5 0.0260Main Deck 5/16 4.5 0.0260Helideck 1/2 6.16 0.0417

Secondary Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W27 X 84 84 26.7 3.204Main Deck W14 X 398 398 18.3 2.196Helideck W6 X 8,5 8.5 5.83 0.700

Main Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W40 X 372 372 40.6 4.872Main Deck W36 X 302 302 37.3 4.476Helideck W6 X 12 12 6.03 0.724

Penghitungan Dengan Beban Terdistribusi

Plate Thickness t (in) W (psf)Cellar Deck 5/16 4.5 0.0260Main Deck 5/16 4.5 0.0260Helideck 1/2 6.16 0.0417

Secondary Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W14 X 68 68 14 1.680Main Deck W12 X 230 230 15.1 1.812Helideck W6 X 8,5 8.5 5.83 0.700

Main Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W33 X 387 387 36 4.320Main Deck W33 X 291 291 34.8 4.176Helideck W6 X 12 12 6.03 0.724

Penghitungan Flash Dengan Beban Terdistribusi

Plate Thickness t (in) W (psf)Cellar Deck 5/16 0 0.0260Main Deck 5/16 0 0.0260Helideck 1/2 0 0.0417

Secondary Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W27 X 84 84 26.7 3.204Main Deck W24 X 192 398 18.3 2.196Helideck W6 X 8,5 8.5 5.83 0.700

Main Girder Designation W (lb/ft) d (in) d (ft) b (in) b (ft)Cellar Deck W40 X 460 372 40.6 4.872Main Deck W36 X 652 302 37.3 4.476Helideck W6 X 12 12 6.03 0.724

Penghitungan Dengan Beban Merata

No. NameCalculation

Value (ft)Item

1

Work Point Elevation Jacket Elevation 7

10Scouring 3

Total 10

Total From Seabed 167

2 Pile Connection Elevation

Work Point Elevation 10

73

Total 7Total From Seabed 164

3

Jacket Elevation Kedalaman 150

7

Horizontal Brace Level 1 Total Pasut 4.6Storm Surge 1

10% Pasang Surut 0.46Total 156.06

157Total From Seabed 157

4Horizontal Brace Level 2 Level 1 157

-32Span 39Total From Seabed 118







8

Cellar Deck Kedalaman 150.000

31

(Top of Steel) Hpasang air laut 4.6000,5 Hmax 15.250Air Gap 5.000

Storm Surge 1.000Main Girder 4.320

Plat 0.026Total 180.196

181Total From Seabed 181

9

Main Deck Hequipment Tertinggi 20.000

59

(Top of Steel) Clearance 3.000Main Girder 4.176

Plat 0.026Total 27.202

28

From MSL (ft)

9

Total From Seabed 209

59

10

Helideck Container Room 20.000

83

(Top of Steel) Clearance 3.000Main Girder 0.724

Plat 0.042 24Total 23.765

24Total From Seabed 233.000

11 Mudline 15012 Pile Stub Elevation 15.5

165.5

21

1.812 4.1762.364

320

Cellar DeckEquipment

No. Description m (Kip) A (ft²)1 Gas Cooler OD 38'' x 20'-0'' 15.682 Emergency generator 22'-0'' x 9'-0'' x 10'-11'' 20.16

3a Battery box 2'-3'' x 2'-3'' x 1'-9'' 1.793b Battery box 2'-3'' x 2'-3'' x 1'-9'' 1.794a Vertical separators OD 54'' x 8'-4'' 36.774b Vertical separators OD 54'' x 8'-4'' 36.775 Maintenance building 12'-3'' x 6'-4'' x 8'-0'' 44.806 Switch gear 5'-0'' x 2'-2'' x 8'-10'' 7.847 Vertical air receiver 7'-0'' x 18'-0'' x 13'-6'' 1.208 Switch gear building 10'-0'' x 10'-0'' x 10'-0'' 6.729 Diesel fuel tank 4'-0'' x 6'-0'' x 8'-0'' 58.24

10a Toilet 16'-6' x 12'-10'' x 12'-0'' 2.2410b Toilet 9'-0'' x 5'-0'' x 6'-9'' 2.2411 Transformer-1 OD 38'' x 6'-4'' 92.00

Blanket Load14 Beban Hidup 90 612 680015 Beban Perpipaan 25 170 680016 Beban Plat 4.5 30.6 6800

Secondary Girder17 Secondary Girder 1 68 4.9018 Secondary Girder 2 68 4.9019 Secondary Girder 3 68 4.9020 Secondary Girder 4 68 4.9021 Secondary Girder 5 68 4.9022 Secondary Girder 6 68 4.9023 Secondary Girder 7 68 4.9024 Secondary Girder 8 68 4.9025 Secondary Girder 9 68 4.9026 Secondary Girder 10 68 4.9027 Secondary Girder 11 68 4.9028 Secondary Girder 12 68 4.9029 Secondary Girder 13 68 4.9030 Secondary Girder 14 68 4.9031 Secondary Girder 15 68 4.9032 Secondary Girder 16 68 4.9033 Secondary Girder 17 68 4.9034 Secondary Girder 18 68 4.90

Main Girder34 Main Girder 1 387 30.9635 Main Girder 2 387 30.9636 Main Girder 3 387 32.9037 Main Girder 4 387 32.90

Deck Leg

E19

user: Luas deck

38 Deck Leg 139 Deck Leg 240 Deck Leg 341 Deck Leg 4

1351.78

Main DeckEquipment

No. Description m (Kip) A (ft²)1 Battery Box 1.792 Battery Box 1.793 Air Compressor Package 3.364 Load Break Switch 1.195 Container Room-1 23.526 Crane 0.047 Crane 0.048 Process Control Room 9.249 Transformer 19.23

10 Transformer 19.2311 Transformer 19.2312 Instument Storage 5.6013 Fresh Water Tank 7.0914 Air Receiver 1.2015 Ansul Drum Chemical Skid 2.4716 Mechanical Storage 7.8417 Life Capsule 2.6918 Communication Microwave 5.3819 Toilet 2.2420 Toilet 2.2421 Fuel Tank 13.4422 Power Instrument Storage 4.4423 Workover Rig 285.0024 Workover Rig 285.00

Blanket Load14 Beban Hidup 100 720.00 720015 Beban Perpipaan 35 252.00 720016 Beban Plat 4.5 32.40 7200

Secondary Girder17 Secondary Girder 1 230 16.5618 Secondary Girder 2 230 16.5619 Secondary Girder 3 230 16.5620 Secondary Girder 4 230 16.5621 Secondary Girder 5 230 16.5622 Secondary Girder 6 230 16.5623 Secondary Girder 7 230 16.5624 Secondary Girder 8 230 16.56

25 Secondary Girder 9 230 16.5626 Secondary Girder 10 230 16.5627 Secondary Girder 11 230 16.5628 Secondary Girder 12 230 16.5629 Secondary Girder 13 230 16.5630 Secondary Girder 14 230 16.5631 Secondary Girder 15 230 16.5632 Secondary Girder 16 230 16.5633 Secondary Girder 17 230 16.5634 Secondary Girder 18 230 16.5635 Secondary Girder 19 230 16.5636 Secondary Girder 20 230 16.5637 Secondary Girder 21 230 16.56

Main Girder34 Main Girder 1 291 23.2835 Main Girder 2 291 23.2836 Main Girder 3 291 29.1037 Main Girder 4 291 29.10

Deck Leg38 Deck Leg 1

1862.10

HelideckEquipment

No. Description m (Kip) A (ft²)1 Boeing Vertol BO 105CBS 0.5291

Blanket Load2 Beban Plat 16.37 20.630 1260.25

Secondary Girder3 Secondary Girder 1 19 0.6654 Secondary Girder 2 19 0.6655 Secondary Girder 3 19 0.6656 Secondary Girder 4 19 0.6657 Secondary Girder 5 19 0.6658 Secondary Girder 6 19 0.6659 Secondary Girder 7 19 0.665

10 Secondary Girder 8 19 0.665Main Girder

34 Main Girder 1 53 1.85535 Main Girder 2 53 1.85536 Main Girder 3 53 1.85537 Main Girder 4 53 1.855

33.90

CoG per Deck

No. Deck m (Kip) m*x

No. Deck m (Kip) m*x

1 Cellar Deck 1351.78 632.242 Main Deck 1862.10 -5376.483 Heli Deck 33.90 1038.11

CoG Topside

No. Deck m (Kip)CoG

x (ft)1 Cellar Deck 1351.78 0.472 Main Deck 1862.10 -2.893 Heli Deck 33.90 30.62

3247.78 Momen TotalCoG Topside

Cellar DeckEquipment

x (ft) y (ft) z (ft) m*x m*y m*z2.32 32.51 1.58 36.38 509.76 24.83-0.55 -32.50 5.46 -11.09 -655.20 110.0413.83 -12.50 0.88 24.76 -22.38 1.5713.97 -17.47 0.88 25.01 -31.27 1.57-22.50 22.50 4.17 -827.33 827.33 153.21-22.50 12.50 4.17 -827.33 459.63 153.2122.50 21.49 4.00 1008.00 962.75 179.2023.50 -4.55 4.42 184.24 -35.67 34.6314.66 -32.65 6.75 17.59 -39.18 8.100.00 3.35 5.00 0.00 22.51 33.60

-22.50 -21.50 4.00 -1310.40 -1252.16 232.9636.88 17.60 6.00 82.61 39.42 13.44-31.34 -38.98 3.38 -70.20 -87.32 7.5625.00 -16.89 3.17 2300.00 -1553.88 291.33

Blanket Load0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 0.00 0.00 0.00

Secondary Girder0 42.5 -0.84 0 208.08 -4.110 37.5 -0.84 0 183.60 -4.110 32.5 -0.84 0 159.12 -4.110 27.5 -0.84 0 134.64 -4.110 22.5 -0.84 0 110.16 -4.110 17.5 -0.84 0 85.68 -4.110 12.5 -0.84 0 61.20 -4.110 7.5 -0.84 0 36.72 -4.110 2.5 -0.84 0 12.24 -4.110 -2.5 -0.84 0 -12.24 -4.110 -7.5 -0.84 0 -36.72 -4.110 -12.5 -0.84 0 -61.20 -4.110 -17.5 -0.84 0 -85.68 -4.110 -22.5 -0.84 0 -110.16 -4.110 -27.5 -0.84 0 -134.64 -4.110 -32.5 -0.84 0 -159.12 -4.110 -37.5 -0.84 0 -183.60 -4.110 -42.5 -0.84 0 -208.08 -4.11

Main Girder0.00 32.50 -2.16 0.00 1006.20 -66.870.00 -32.50 -2.16 0.00 -1006.20 -66.87

-22.50 0.00 -2.16 -740.14 0.00 -71.0522.50 0.00 -2.16 740.14 0.00 -71.05

Deck Leg

632.24 -647.58 899.47

Main DeckEquipment

x (ft) y (ft) z (ft) m*x m*y m*z11.58 -23.56 28.88 20.73 -42.17 51.69 1.7513.83 -23.56 28.88 24.76 -42.17 51.69 1.7512.14 -45.17 31.00 40.79 -151.77 104.16 612.74 -40.42 31.21 15.16 -48.10 37.14 6.42-14.56 -28.99 38.00 -342.45 -681.84 893.76 2022.50 -45.00 28.00 0.95 -1.89 1.18 0-22.50 35.00 28.00 -0.90 1.40 1.12 022.49 -12.51 34.00 207.81 -115.59 314.16 1210.95 -30.85 32.00 210.57 -593.25 615.36 824.20 -29.40 32.00 465.37 -565.36 615.36 824.20 -37.40 32.00 465.37 -719.20 615.36 81.99 29.00 31.25 11.14 162.40 175.00 6.5

-22.50 -42.74 33.00 -159.59 -303.15 234.07 109.99 -14.99 31.13 11.99 -17.99 37.35 6.25

-22.50 27.58 30.21 -55.62 68.18 74.68 4.4224.19 29.08 32.38 189.65 227.99 253.82 8.752.80 -53.25 28.00 7.53 -143.24 75.32 0-8.13 -43.55 32.50 -43.74 -234.30 174.85 936.88 17.10 32.00 82.61 38.30 71.68 8-31.34 -39.48 32.00 -70.20 -88.44 71.68 8-7.84 28.90 30.29 -105.37 388.42 407.10 4.5813.07 29.08 32.50 58.03 129.12 144.30 9-22.50 10.00 28.00 -6412.50 2850.00 7980.0022.50 10.00 28.00 6412.50 2850.00 7980.00

Blanket Load0.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 0.00 0.00 0.000.00 0.00 0.00 0.00 0.00 0.00

Secondary Girder0 50 26.27 0.00 828.00 435.030 45 26.27 0.00 745.20 435.030 40 26.27 0.00 662.40 435.030 35 26.27 0.00 579.60 435.030 30 26.27 0.00 496.80 435.030 25 26.27 0.00 414.00 435.030 20 26.27 0.00 331.20 435.030 15 26.27 0.00 248.40 435.03

0 10 26.27 0.00 165.60 435.030 5 26.27 0.00 82.80 435.030 0 26.27 0.00 0.00 435.030 -5 26.27 0.00 -82.80 435.030 -10 26.27 0.00 -165.60 435.030 -15 26.27 0.00 -248.40 435.030 -20 26.27 0.00 -331.20 435.030 -25 26.27 0.00 -414.00 435.030 -30 26.27 0.00 -496.80 435.030 -35 26.27 0.00 -579.60 435.030 -40 26.27 0.00 -662.40 435.030 -45 26.27 0.00 -745.20 435.030 -50 26.27 0.00 -828.00 435.03

Main Girder0.00 30.00 25.09 0.00 698.40 584.050.00 -30.00 25.09 0.00 -698.40 584.05

-22.50 0.00 25.09 -654.75 0.00 730.0622.55 0.00 25.09 656.21 0.00 730.06

Deck Leg

-5376.48 1690.53 23894.63

HelideckEquipment

x (ft) y (ft) z (ft) m*x m*y m*z0.00 0.00 0.00 0.00 0.00 0.00

Blanket Load35.00 26.00 0.00 722.06 536.39 0.00

Secondary Girder17.5 26.00 19.38 11.64 17.29 12.8922.5 26.00 19.38 14.96 17.29 12.8927.5 26.00 19.38 18.29 17.29 12.8932.5 26.00 19.38 21.61 17.29 12.8937.5 26.00 19.38 24.94 17.29 12.8942.5 26.00 19.38 28.26 17.29 12.8947.5 26.00 19.38 31.59 17.29 12.8952.5 26.00 19.38 34.91 17.29 12.89

Main Girder26.25 0.00 19.18 48.69 0.00 35.5843.75 0.00 19.18 81.16 0.00 35.580.00 17.25 19.18 0.00 32.00 35.580.00 34.75 19.18 0.00 64.46 35.58

1038.11 771.17 245.42

CoG per Deck

m*y m*zCoG

m*y m*zx (ft) y (ft) z (ft)

-647.58 899.47 0.47 -1.021690.53 23894.63 -2.89 -0.31771.17 245.42 30.623 22.749

CoG TopsideCoG

m*x m*y m*zy (ft) z (ft)-1.02 632.24 -1384.57 899.47-0.31 -5376.48 -585.50 23894.6322.75 1038.11 771.17 245.42

Momen Total -3706.12 -1198.90 25039.51

CoG Topside -1.14 -0.37 7.71Ket. Titik Ket. Titik Ket. Titik acuan di 0,0,0 Cellar Deck

Gas Cooler 20.00Emergency generator 10.92Battery box 1.75Vertical separators 8.33Maintenance building 8.00Switch gear 8.83Switch gear building 14.00Switch gear building 13.50Diesel fuel tank 10.00Toilet 8.00Transformer-1 12.00Transformer-2 6.75Vertical air receiver 6.33

III. PERHITUNGAN DISTRIBUSI BEBAN DECK LEG PADA CELLAR DECKdata :D2 = 574.68 kips * Load factorL2 = 782.00 kips * Load factor

= 1920.08 kipsx = 0.47 fty = -1.02 ft

L1 = 42.77 ftL2 = 40.69 ftL3 = 38.60 ftL4 = 36.28 ft

Perbandingan distribusi beban:lengan terpendek

L4 = 36.28 ftlengan terpendek dibandingkan dg lengan yg lain

L4= 0.848

L4= 0.892

L1 L2

Jika Beban pada setiap jaket adalah Pi= P1 + P2 + P3 + P4

Dimana, P1 x L1 = P4 xP2 x L2 = P4 x P3 x L3 = P4 x

Maka,

P3 x L3 = P4 x

P3 = P4 x

P3 = P4 x

P2 x L2 = P4 x

P2 = P4 x

P2 = P4 x

W total

Wtotal

P1 x L1 = P4 x

P1 = P4 x

P1 = P4 x

= P1 + P2 + P3 + P41920.08 = 3.680 P4 kips.ft

P4 = 521.793 kips0 = 0.000 kips0 = 0.000 kips

P3 = 490.432 kipsP2 = 465.241 kipsP1 = 442.615 kips

Dari perhitungan di atas, beban terberat adalah P4 = 521.793 kips

Wtotal

1.31.5

L4= 0.940

L3

L4 kips.ftL4 kips.ftL4 kips.ft

L4 kips.ftL4

kips.ftL30.940 kips.ft

L4 kips.ftL4


L4 kips.ftL4


III. PERHITUNGAN DISTRIBUSI BEBAN DECK LEG PADA MAIN DECKdata :D2 = 1174.13 kips *L2 = 1080.00 kips *

= 3146.37 kipsx = -2.89 fty = -0.31 ft

L1 = 35.93 ftL2 = 34.53 ftL3 = 40.49 ftL4 = 39.25 ft

Perbandingan distribusi beban:lengan terpendek

L2 = 34.53 ftlengan terpendek dibandingkan dg lengan yg lain

L2= 0.961

L2=

L1 L4


Dimana, P1 x L1 =P3 x L3 =P4 x L4 =

Maka,

P3 x L3 =

P3 =

P3 =

P4 x L4 =

P4 =

P4 =

W total

Wtotal

P1 x L1 =

P1 =

P1 =

= P1 + P2 + P3 + P43146.37 = 3.694 P2 kips.ft

P2 = 851.847 kips0 = 0.000 kips0 = 0.000 kips

P3 = 726.458 kipsP4 = 749.408 kipsP1 = 818.655 kips

Dari perhitungan di atas, beban terberat adalah P2 = 851.847 kips

Wtotal

Load factor 1.3Load factor 1.5

0.880L2

= 0.853L3

P2 x L2 kips.ftP2 x L2 kips.ftP2 x L2 kips.ft

P2 x L2 kips.ft

P2 xL2

kips.ftL3

P2 x 0.853 kips.ft

P2 x L2 kips.ft

P2 xL2

kips.ftL4

P2 x 0.880 kips.ft

P2 x L2 kips.ft

P2 xL2

kips.ftL1

P2 x 0.961 kips.ft

III. PERHITUNGAN DISTRIBUSI BEBAN DECK LEG PADA HELI DECKdata :D2 = 33.90 kipsL2 = 0.00 kips

= 44.07 kipsx = 30.62 fty = 22.75 ft

L1 = 17.67 ftL2 = 17.67 ftL3 = 17.67 ftL4 = 17.67 ft

Perbandingan distribusi beban:Keempat lengan memiliki panjang yang sama

L1= L2 = L3 =L4 17.67


Dimana, P1 x L1

Beban yang diterima masing masing lengan:

=44.07

4 4

= 11.0173

W total

Wtotal

Wtotal

PERHITUNGAN DISTRIBUSI BEBAN DECK LEG PADA HELI DECK

* Load factor 1.3* Load factor 1.5

Keempat lengan memiliki panjang yang samaft

Jika Beban pada setiap jaket adalah PiP1 + P2 + P3 + P4

= P2 x L2 = P3 x L3 x P4 x L4 kips.ft

Beban yang diterima masing masing lengan:

(karena panjang masing-masing lengan sama)

V. PERHITUNGAN DIAMETER DECK LEGPerhitungan berikut berdasarkan API-LRFDBeban terbesar dari keseluruhan sistem merupakan beban yang digunakan. Karena gaya terbesar akan bekerja pada kolom terbesar

∑P1 =∑P2 =∑P3 =∑P4 =

P =

fc =

DenganA adalah luasan deck leg berupa lingkaran

Berdasarkan API RP 2A-LRFD, column buckling harus memenuhi syarat sebagai berikut:

Dari persamaan di atas kita bisa menentukan properties deck leg dengan langkah-langkah iterasi sbb:1. Merencanakan ukuran awalOD =d/t =t =A =L =

=K =r =

=

2. Menentukan column slenderness parameterDari persamaan D.2.2-2cλ =

3. Menentukan Fcn λ <Fcn =

4. Menentukan dimensi deck leg berdasarkan persamaan API_LRFD D.2.2-1

fc =ᴓc =Fcn =

fc <27.74333 <

Sehingga didapatkan

PERHITUNGAN DIAMETER DECK LEGPerhitungan berikut berdasarkan API-LRFDBeban terbesar dari keseluruhan sistem merupakan beban yang digunakan. Karena gaya terbesar akan bekerja pada kolom terbesar

1305.340 kips1361.157 kips1260.959 kips1315.271 kips

1361.157 kips (diambil nilai yang terbesar)

P (kips)A ft2

A adalah luasan deck leg berupa lingkaran

Berdasarkan API RP 2A-LRFD, column buckling harus memenuhi syarat sebagai berikut:

Dari persamaan di atas kita bisa menentukan properties deck leg dengan langkah-langkah iterasi sbb:1. Merencanakan ukuran awal

25 in40

0.63 in49.06 in226.00 ft

312 in1

0.35 OD8.75 in

2. Menentukan column slenderness parameterDari persamaan D.2.2-2c

0.40

√2 Maka Fcn Mengikuti Persamaan D.2.2-2a34.55928

4. Menentukan dimensi deck leg berdasarkan persamaan API_LRFD D.2.2-1

27.743330.85

34.55928

ᴓc.Fcn29.37538 memenuhi

D = 25 int = 0.63 in

Menurut API LRFD syarat pondasi yaitu:

Maka kita akan terlebih dahulu menentukan ultimate axial pile capacity:

Dari data didapatkan bahwa tanah pada lokasi struktur merupakan tanah tipe A

Maka unit skin friction capacitynya dalah

Dari tabel G.4.3-1 didapatkan

f = 2.4 kips/ft²q = 250 kips/ft²

Perhitungan Qd:

1. Menentukan dimensi pile: (iterasi)OD = 25 in = 2.083333 ft

L = 6 x OD = 12.5 ft (AFL, untuk estimasi awal penetrasi pile)2. Menghitung Qd

Qd = Qf + Qp = f. As + q. Ap

f = 2.4 kips/ft²q = 250 kips/ft²

Ap = 3.407118 ft² >>> Pile tip areaAs = 88.58507 ft² >>> Embedded pile shaft area

Qd = 1064.384 kips

3. Cek Pile Capacity berdasarkan resistance factor

Pdo = 1361.157ᴓdo = 0.7

Pdo > ᴓdo x Qd1361.157 > 745.0686 >>> tidak memenuhi

Maka OD pile = 25 in = 2.083333 ft

4. Perhitungan Pile Thickness berdasarkan API LRFD

t = 0.50 in0.6 int ≈

(AFL, untuk estimasi awal penetrasi pile)

PERHITUNGAN DIAMETER JACKET LEG

Properties yang direncanakan (trial and error)

=ξ = clearance min 1.5 in

= 2.0 inOD pile = 25.0 in

D/t = 45.0

Maka,

= 25.0 + + 445.0

44/45 = 29.0

= 29.659 in≈ 30 in= 2.5 ft

Sehingga didapatkan,OD Jacket = 30 in

Diameter akibat Marine Growth

Penambahan Diameter OD akibat Marine Growth = 4

== 33.66 in= 2.80 ft

Perhitungan unbrace length ,

Slenderness RatioDengan :k = 1 (untuk jacket leg )

r == 10.38068 in

maka, k x L = 75 Ketentuan ukuran Brace

r 60 <L = 75 x r

k= 778.5511 in= 64.879 ft

Perhitungan di atas menunjukkan bahwa panjang unbrace lengthmaksimum sebesar 64.879 ft

OD jacket OD pile+ 2t.jacket + 2ξ

OD jacketOD jacket

OD jacket

OD jacket

OD jacket (MG) (OD jacket + MG)

0.35 x ODjacket (jari - jari girasi )

kL

r

Perhitungan tebal jacket

= in45.0

= 0.66 in

= 0.05 ft

Perhitungan Diameter Brace Keterangan :

= 2 = Diameter jacket

= Diameter brace= OD jacket 𝛽 = 0.5

2= 14.83 in= 1.24 ft

Diameter akibat Marine GrowthPenambahan Diameter OD akibat Marine Growth = 4

== 19 in= 1.57 ft

Sehingga didapatkan diameter brace = 1.57 ft18.82955 in

Perhitungan Tebal Brace

D= 50

t14.830

= 50t

= 0.297 in ~ 0.3 in= 0.025 ft

Sehingga didapatkan tebal brace = 0.025

TJ OD jacket

TJ

TJ

OD jacket OD jacket

D brace OD brace

D brace

D brace(MG) (D brace + MG)

t brace

inch

< 90

Diameter jacket

Diameter brace

inch

D wb 28.34091T Wb 1.670455

ft

Beban Lingkungan

Beban Angin

Dengan arah x dan y, sehingga rumus untuk masing-masing bidang adalahSumbu x

Sumbu y

Keterangan

ρ = Massa jenis udaraA = Luas karakteristik strukturV = Kecepatan Hembus AnginCs = Koefisien Bentuk

1. Perhitungan gaya angin pada setiap deck

ElevasiMain Deck = ftCellar Deck = ftHeli Deck = ft

Cs = 1

Beban pada deck legPanjang deck leg = 31 ftJacket ke Seabed = 181 ftLWL = 150 ft

Deck Leg Wind Velocity Main Deck Wind Velocity

OPERASI OPERASIKetinggian deck leg = 24 Elevasi Main Deck

= 65.97Vz = 63.036045 Vz

BADAI BADAIKetinggian deck leg = 24 Elevasi Main Deck

= 109.95

V33 V33

V33 V33

Vz = 105.06007 Vz

Cellar Deck Wind Velocity Heli Deck Wind Velocity

OPERASI OPERASIElevasi Cellar Deck = 31.00 Elevasi Heli Deck

= 65.97Vz = 65.38 Vz

BADAI BADAIKetinggian deck leg = 29.00 Elevasi Heli Deck

= 109.95Vz = 107.94 Vz

2. Perhitungan arah pembebanan

Orientasi Platform = 60 ᴼ Fθx/Fx =

Fθy/Fy =

Sudut Pembebanan

0 = 60 ᴼ45 = 105 ᴼ90 = 150 ᴼ

135 = 195 ᴼ180 = 240 ᴼ225 = 285 ᴼ270 = 330 ᴼ315 = 375 ᴼ

Cellar Deck Leg Wind Force= 0.00238 slug/ft3

Cs = 1V operasi = 65.38 ft/sV badai = 107.94 ft/s

Panjang Cellar = 85 ftLebar Cellar = 80 ft

Ax = 1020 ft2Ay = 960 ft2

Fx operasi = 5188.98382 5.189Fy operasi = 4883.74948 4.884Fx badai = 14141.7929 14.142

Fy badai = 13309.9228 13.310

KONDISI OPERASI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25

V33 V33

V33 V33

Fx=0.5 x ρ x Cs x Ax x VFy=0.5 x ρ x Cs x Ay x V

ρ udara

Sin2θ Cos2θ

105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75375.00 0.26 0.97 0.07 0.93

KONDISI BADAI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75

375.00 0.26 0.97 0.07 0.93

Main Deck Leg Wind Force= 0.00238 slug/ft3



Ax = 1200 ft2Ay = 960 ft2

Fx operasi = 6104.68685 6.105Fy operasi = 4883.74948 4.884Fx badai = 16637.4035 16.637Fy badai = 13309.9228 13.310

KONDISI OPERASI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75375.00 0.26 0.97 0.07 0.93

KONDISI BADAI

Sin2θ Cos2θ

ρ udara

Sin2θ Cos2θ

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75

375.00 0.26 0.97 0.07 0.93

Heli Deck Leg Wind Force= 0.00238 slug/ft3



Ax = 2025 ft2Ay = 2025 ft2


KONDISI OPERASI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75375.00 0.26 0.97 0.07 0.93

KONDISI BADAI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75

375.00 0.26 0.97 0.07 0.93

Sin2θ Cos2θ

ρ udara

Sin2θ Cos2θ

Sin2θ Cos2θ

Deck Leg Wind Force= 0.00238 slug/ft3

Cs = 0.5V operasi = 63.04 ft/sV badai = 105.06 ft/s

Panjang Cellar = ftLebar Cellar = ft

Ax = 0.491 ft2Ay = 0.491 ft2


KONDISI OPERASI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75375.00 0.26 0.97 0.07 0.93

KONDISI BADAI

Sudut Sin θ Cos θ60.00 0.87 0.50 0.75 0.25105.00 0.97 -0.26 0.93 0.07150.00 0.50 -0.87 0.25 0.75195.00 -0.26 -0.97 0.07 0.93240.00 -0.87 -0.50 0.75 0.25285.00 -0.97 0.26 0.93 0.07330.00 -0.50 0.87 0.25 0.75

375.00 0.26 0.97 0.07 0.93

Gaya Total Kondisi Operasi Gaya Total Kondisi BadaiDeck Total Fθx Total Fθy Deck

Main Deck 24.42 19.53 Main DeckCellar Deck 20.76 19.53 Cellar DeckHeli Deck 54.60 54.60 Heli DeckDeck Leg 0.0046 0.0046 Deck Leg

Total 99.78 93.67 Total

SudutOperasi Badai

ρ udara

Sin2θ Cos2θ

Sin2θ Cos2θ

Sudut Fx total Fz total Fx total Fz total60.00 17.712 28.34 48.78 78.10105.00 -4.955 15.63 -13.65 43.07150.00 7.232 -4.92 19.92 -13.56195.00 29.899 7.79 82.34 21.47240.00 17.712 28.34 48.78 78.10285.00 -4.955 15.63 -13.65 43.07330.00 7.232 -4.92 19.92 -13.56375.00 29.899 7.79 82.34 21.47

DeckOperasi Badai

Fx Fy Fx FyMain Deck 24.42 19.53 66.55 53.24Cellar Deck 20.76 19.53 56.57 53.24Heli Deck 54.60 54.60 151.66 151.66Deck Leg 0.00 0.00 0.01 0.01

Beban Lingkungan

Beban Angin

Dengan arah x dan y, sehingga rumus untuk masing-masing bidang adalahSumbu x

Sumbu y

Tabel Koefisien Bentuk

Object

beams 1.5cylinders 0.5

side of building 1.5

1

1. Perhitungan gaya angin pada setiap deck

KecepatanV operasi = 45 mph

65.97 ft/s39.1005 knot

V badai = 75 mph109.95 ft/s

65.1675 knot

Elevasi deck leg dari LWL

Selisih = 31 ft

Main Deck Wind Velocity

OPERASI= 59.00

= 65.97= 71.68

BADAI= 59.00

= 109.95

Shape Coefficient

projected area of platform

= 119.47

Heli Deck Wind Velocity

OPERASI= 83.00

= 65.97= 75.26

BADAI= 83.00

= 109.95= 125.43

2. Perhitungan arah pembebanan

Cellar Deck Leg Wind Force

kipskipskips

kips

KONDISI OPERASI

Fx Fy Fθx Fθy0.71 1.21 5.189 4.884 3.68 5.91

cos2θ+(Ax/Ay x sin θ x cos θ)

sin2θ+(Ax/Ay x sin θ x cos θ)

x Cs x Ax x V2

x Cs x Ay x V2

Fθx/Fx Fθy/Fy

-0.20 0.67 5.189 4.884 -1.03 3.260.29 -0.21 5.189 4.884 1.50 -1.031.20 0.33 5.189 4.884 6.22 1.620.71 1.21 5.189 4.884 3.68 5.91-0.20 0.67 5.189 4.884 -1.03 3.260.29 -0.21 5.189 4.884 1.50 -1.031.20 0.33 5.189 4.884 6.22 1.62

20.76 19.53

KONDISI BADAI

Fθx Fθy Fx Fy Fθx Fθy0.71 1.21 14.142 13.310 10.04 16.11-0.20 0.67 14.142 13.310 -2.81 8.880.29 -0.21 14.142 13.310 4.10 -2.801.20 0.33 14.142 13.310 16.95 4.430.71 1.21 14.142 13.310 10.04 16.11-0.20 0.67 14.142 13.310 -2.81 8.880.29 -0.21 14.142 13.310 4.10 -2.801.20 0.33 14.142 13.310 16.95 4.43

56.57 53.24

Main Deck Leg Wind Force

kipskipskipskips

KONDISI OPERASI

Fx Fy Fθx Fθy0.71 1.21 6.105 4.884 4.33 5.91-0.20 0.67 6.105 4.884 -1.21 3.260.29 -0.21 6.105 4.884 1.77 -1.031.20 0.33 6.105 4.884 7.32 1.620.71 1.21 6.105 4.884 4.33 5.91-0.20 0.67 6.105 4.884 -1.21 3.260.29 -0.21 6.105 4.884 1.77 -1.031.20 0.33 6.105 4.884 7.32 1.62

24.42 19.53

KONDISI BADAI

Fθx/Fx Fθy/Fy

Fθx Fθy Fx Fy Fθx Fθy0.71 1.21 16.637 13.310 11.81 16.11-0.20 0.67 16.637 13.310 -3.30 8.880.29 -0.21 16.637 13.310 4.82 -2.801.20 0.33 16.637 13.310 19.94 4.430.71 1.21 16.637 13.310 11.81 16.11-0.20 0.67 16.637 13.310 -3.30 8.880.29 -0.21 16.637 13.310 4.82 -2.801.20 0.33 16.637 13.310 19.94 4.43

66.55 53.24

Heli Deck Leg Wind Force

kipskipskipskips

KONDISI OPERASI

Fx Fy Fθx Fθy0.71 1.21 13.649 13.649 9.69 16.52-0.20 0.67 13.649 13.649 -2.71 9.110.29 -0.21 13.649 13.649 3.96 -2.871.20 0.33 13.649 13.649 16.36 4.540.71 1.21 13.649 13.649 9.69 16.52-0.20 0.67 13.649 13.649 -2.71 9.110.29 -0.21 13.649 13.649 3.96 -2.871.20 0.33 13.649 13.649 16.36 4.54

54.60 54.60

KONDISI BADAI

Fθx Fθy Fx Fy Fθx Fθy0.71 1.21 37.915 37.915 26.92 45.88-0.20 0.67 37.915 37.915 -7.53 25.300.29 -0.21 37.915 37.915 10.99 -7.971.20 0.33 37.915 37.915 45.45 12.610.71 1.21 37.915 37.915 26.92 45.88-0.20 0.67 37.915 37.915 -7.53 25.300.29 -0.21 37.915 37.915 10.99 -7.97

1.20 0.33 37.915 37.915 45.45 12.61

151.66 151.66

Fθx/Fx Fθy/Fy

Deck Leg Wind Force

kipskipskipskips

KONDISI OPERASI

Fx Fy Fθx Fθy0.71 1.21 0.001 0.001 0.00 0.00-0.20 0.67 0.001 0.001 0.00 0.000.29 -0.21 0.001 0.001 0.00 0.001.20 0.33 0.001 0.001 0.00 0.000.71 1.21 0.001 0.001 0.00 0.00-0.20 0.67 0.001 0.001 0.00 0.000.29 -0.21 0.001 0.001 0.00 0.001.20 0.33 0.001 0.001 0.00 0.00

0.00 0.00

KONDISI BADAI

Fθx Fθy Fx Fy Fθx Fθy0.71 1.21 0.003 0.003 0.00 0.00-0.20 0.67 0.003 0.003 0.00 0.000.29 -0.21 0.003 0.003 0.00 0.001.20 0.33 0.003 0.003 0.00 0.000.71 1.21 0.003 0.003 0.00 0.00-0.20 0.67 0.003 0.003 0.00 0.000.29 -0.21 0.003 0.003 0.00 0.00

1.20 0.33 0.003 0.003 0.00 0.00

0.01 0.01

Gaya Total Kondisi BadaiTotal Fθx Total Fθy

66.55 53.2456.57 53.24

151.66 151.660.01 0.01

274.79 258.15

Fθx/Fx Fθy/Fy

Titik Tangkap (ft)Operasi (kip.ft) Badai (kip.ft)

Fx Fy Fx Fy59.00 209.00 5103.52 4082.81 13908.87 11127.1031.00 181.00 4337.99 4082.81 11822.54 11127.1083.00 233.00 11410.85 11410.85 31696.82 31696.8224.00 174.00 0.97 0.97 2.70 2.70

Total (kip.ft) 20853.3 19577.5 57430.9 53953.7

excel trb 2

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