A Presentation on the design of an 2900 DWTOIL TANKER Supervised by

Dr. MD. Sadiqul Baree Professor Department of Naval Architecture & Marine Engineering , BUET

Designed byMohammad Kifayath Chowdhury Student No: 1112023Mahmudur RahmanStudent No: 1112049

Ship Design Project & PresentationNAME 338

Ship Type : Oil TankerDWT : 2900 tonnesRoute : Chittagong to DhakaSpeed : 10 knots

OBJECTIVE

Presentation ContentsScantling Calculation &

DrawingDetail Lightweight &

Deadweight Calculation Stability Calculation

Trim Calculation

Principal Particulars

Length overall( LOA ): 76.2 m Length between perpendiculars ( LBP ): 73.152 m Moulded Breadth ( B ): 15 m Moulded Depth ( D ): 5.94 m Moulded Draught ( H ) : 3.96 m Block co-efficient ( CB ) : 0.83 Frame spacing a=0.6m Web frame spacing Material factor (sec 2 A.2 pg. 2-1)

General Arrangement Drawing

Lines Plan Drawing

Scantling Calculation &Drawing

Scantling CalculationReference Rulebook: DNVGLFraming System: Longitudinal Framing Deck Members Deck Girder:Section Modulus, W = c × e × l2 × P × k ( sec 10 B2.2.1)

= 0.75 × 2.4× 2.42 × 25.93 × .72=193.566 cm3

 Dimension׃ T- 180x100x8 Deck Web:Section Modulus=c* (m2

k1-m2a)*a*l2*p*k (sec 10 B 1.1)

=.75*(1-0)*.6*22*25.93*1 (mk1,ma in pg. 12-3) = 46.674 cm3

Dimension׃ T 80x60x8

Deck longitudinal Section Modulus=c* (m2

k1-m2a)*a*l2*p*k (sec 10 B 1.1)

=.65*(1-0)*.6*2.42*25.93*.72 (mk1,ma in pg. 12-3) =41.94cm3

Dimension =L-80x60x7 Strength deck plating:tmin= (4.5+.05L) (Sec 7 B 6.1) = (4.5+.05x73.152)x mm =6.92 mm  Taking thickness, tD = 7mm

Side MembersSide shell plate thickness TS1 = 1.9 ×nf × a × +tk= 6.76mm (Sec-6, C.1)

 Minimum Thickness = T+Cb/2 = 7.473 mmSelected: 8 mmWeb frame ׃Section modulus, W = 0.55 × e × l2 × P × nc × k (Ref. Sec9,B-5.3.1 pg.9-5) = 0.55 × 2.4 × 4.942 ×27.69× 1 × .72= 642.219 cm3

Dimension ׃ T 360x190x7

 

Side Stringers Section modulus, W = 0.55 × e × l2 × P × nc × k (Sec9,B-5.3.1 pg.9-5) = 0.55 × 2.4 × 2.42 ×39.68× 1 × .72= 217.22 cm3

Dimension ׃ T 200x140x6SIDE LONGITUDINALS Section Modulus Wl=83/σpr((m2

k1-m2a)*a*l2* Ps (Sec 9 C3.1)

=(83/152.73)x1x.6x2.42x42.959 =80.68 cm3

Dimension ׃ L 120x60x8WEB PLATE THICKNESS:  t = 9 mm According to table 15 (Ref. .M.M. Zulfikar (2008).The Inland Shipping Laws & Rules,Pg144) 

 

 

 Shear strake:  t= 0.5(tD +tS ) (Sec 6 C.2 pg.6-5) =0.5( 7+8) = 7.5 mm Taking t = 8 mm  Width = 800+5L mm =1165.76 mm Bracket thickness: The thickness of brackets is not to be lessthan:t = c × + tk (sec 3 B 3.5.2.2)= 1.2 × + 1.5

=9.27 mm≈10 mm

Bottom MembersBottom Plate ThicknessCorrosion addition tk = 1.5 mm, for thickness ≤10 mm (Sec-3, G-1 pg.3-30)

tB1= 1.9 X nf X a X ( + tk )= 1.9x0.83x.6x +1.5=7.714mmtB2 =1.21 x a x + tK =1.21x.6x +1.5 =6.268 mmMinimum bottom plate thickness = c1 +tk≈ 8.75 mmAccepted Bottom plate thickness 9 mm. Bilge thicknessBilge thickness = Bottom plate thickness = 9 mmThe width of bilge plate keel is not to be less than :B= 800+5L (mm) (Sec-6, pg.6-4) =800+5 × 73.152= 1165.76mm=1.165 m

Center Girder: Depth, h = 350 + 45×B (Sec-8, C- 2.2.1 pg. 8-4)= 350 + (45×1)= 1025mm Double bottom depth=1000 mmThickness, t = ( + 1) × for h≤1200 mm (Sec-8,C- 2.2.2) = ( + 1) × =9.78 mm ≈ 10 mmFace plate width ≈ 10×10=100mm  Dimension׃ T- 1000× 100× 10 (Ref. Zulfikar.M.M. (2008).The Inland Shipping Laws & Rules, P-170) 

Flat Keel Plate The thickness of flat plate keel should not be less thantFK = tB+2.0 (Sec-6, B 4.1 pg.6-4) =9+2.0=11 mmSo we take the thickness of our flat plate keel as tFK=11 mm.The width of flat plate keel is not to be less than :B= 800+5L (mm) (Sec-6, B 4.1 pg.6-4)=800+5 × 73.152= 1165.76mm=1.165 mInner Bottom Thickness : t= 1.1 a (p k) 0.5 + tk (Sec-8, C.4.1)

=1.1 *0.6* (59.917*.72)0.5 + 1.5=5.83 mm ≈ 6 mm

Bottom Side Girder: t= * h2 / (120* ha ) (Sec-8, C.3.2pg. 8-5) =10002/1000x120x mm =7.07 mmHeight of double bottom=1000 mmSo. Dimension= T 1000x100x8

 

 Bottom longitudinalsWl=83/σpr((m2

k1-m2a)*a*l2*p

 So,Putting values, Wl=82.8 cm3

 Dimension ׃ L 120x60x8Floor plate: The thickness of the plate floor tpf = tm - 2.0 (Sec 8 C 5.2.1 pg. 8-6)

=10 – 2.0 = 8.3 mm

Taken thickness 9 mm.Inner Bottom Longitudinal Wl=83/σpr((m2

k1-m2a)*a*l2*p (Sec-4,B.5 pg. 4-5)

σpr=150/k=208.33a=.6

 Putting values, Wl=82.8 cm3

 Dimension ׃ L 120x60x8 

Scantling Summary

Dimension ThicknessDeck girder T 180x100x8 Strength deck plating: 7 mmDeck web T 80x60x8 Side shell plate thickness 8 mm

Web plate thickness 9 mmDeck longitudinals L 80x60x7 Shear strake 8 mmSide stringer T 200x140x6 Bracket thickness 10 mmWeb frame T 360x190x7 Center Girder 10 mmSide longitudinals L- 120x60x8 Bottom plate 9 mmCenter girder T- 1000× 100× 10 Flat Keel Plate 11 mmBottom Side girder T 1000x100x8 Inner Bottom Thickness 6 mmBottom longitudinal L- 120x60x8 Floor plate 9 mmBulkhead stiffener L- 40x20x6 Bilge plate thickness 9 mmSuperstrtc. Deck girder T 170x90x6 Collision Bulkhead plating 6 mmSuperstrtc. Side stringer T 120x60x8 Other Bulkhead plating 5 mmInner bottom longitudinal L- 120x60x8

Longitudinal Bulkhead Plating 7 mm

Midship Section Drawing

Longitudinal ConstructionDrawing

Shell Expansion Drawing

Type Number DimensionKeel Plate 12 K1= 5000x800x11

K2-K11=6000x800x11 K12=5400x800x11

Bottom Plate 

24 B1-B11,B13-B23=6000x2000x9 B12=1460x2000x9 B24=4560x2000x9

Bilge Plate 

13 BL1-BL11=6000x2000x9 BL12=4660x2000x9 BL13=4680x2000x9

Side Shell 36 S1-S12=6000x2000x8 S14-S25,S28,S30=6000x2000x8

S13=5640x2000x8 S26=4250x2000x8 S27=2200x2000x8 S29=5000x2000x8 S31=6000x1000x8 S32=5000X1000X8 S33=3600X1000X8 S34=3100X2000X8 S35=5900X2000X8

 

Shear Strake 13 SS2-SS12=6000X1200X8 SS1=4000X1200X8 SS13=4000X1200X8 SS14=4280X1200X8

Plating:

Detailed LightWeight Calculation

NAME OF ITEMS

 

WEIGHT OF ITEMS VCG about KEEL

 

LCG about AMIDSHIP MOMENT about AMIDSHIPQUANTITY OF ITEMS MOMENT aboutt KEEL

PARALLEL MIDDLE BODY59.63 0.000512182

Deck Beam 20 3.141256 5.94 18.65906064 2.4 7.5390144Deck Girder 4 3.35991392 5.94 19.95788868 2.4 8.063793408

Deck Longitudinal 12 7.19103528 5.94 42.71474956 2.4 17.25848467Side Stringer 4 3.24723388 2.587 8.400594048 2.4 7.793361312

Side Longitudinal 18 7.1449389 2.587 18.48395693 2.4 17.14785336Centre Girder 1 5.634002 0.5 2.817001 2.4 13.5216048 Side girder 4 12.292368 0.59 7.25249712 2.4 29.5016832

Bottom Longitudinal 14 5.90033664 0.06 0.354020198 2.4 14.16080794Inner Bottom Longitudimal 12 5.90033664 0.97 5.723326541 2.4 14.16080794

Transverse Bulkhead 6 24.938508 2.97 74.06736876 2.3 57.3585684Longitudinal Bulkhead 1 22.2286988 2.97 66.01923544 2.4 53.34887712

Bulkhead Stiffener 56 1.73615624 3.56 6.180716214 2.3 3.993159352Web Frame 20 2.737295 2.97 8.12976615 2.4 6.569508web floor 20 18.23712 0.57 10.3951584 2.4 43.769088

web floor stiffener 204 1.6014 0.57 0.912798 2.4 3.84336 ballast water partition 2 37.2868496 3.6 134.2326586 2.4 89.48843904

bracket 272 3.36294 3.6 12.106584 2.4 8.071056deck plate 54.0864192 5.94 321.27333 2.4 129.8074061keel plate 7.897 0.055 0.434335 2.4 18.9528

bottom plate 39.03 0.055 2.14665 2.4 93.672bilge plate 38.33 0.53 20.3149 2.4 91.992shell plate 47.6 3.6 171.36 2.4 114.24

pipes, pumps & acessories 8.5 3.4 28.9 2.4 20.4FENDER 1.45 6 8.7 2.4 3.48

inner bottom plate 1 47.15 1.004 47.3386 2.4 113.16

TOTAL 409.9838081 1036.875195 981.293673

NAME OF ITEMS

 

WEIGHT OF ITEMS VCG about KEEL

 

LCG about AMIDSHIP MOMENT about AMIDSHIPQUANTITY OF

ITEMSMOMENT aboutt

KEEL

ENTRANCE Anchor 1 2.9 7.8 22.62 33.6 97.44

mooring ropes 0.85 7.6 6.46 33.3 28.305chain cable 1 2.75 7.8 21.45 32 88

stringers 0.95 3.6 3.42 30 28.5bollard 4 0.6 8 4.8 33.6 20.16

hawse pipes 0.15 7.8 1.17 33.3 4.995stem bar 1 1.55 6.4 9.92 38.3 59.365

forecastle deck plate 8.2 7.25 59.45 33 270.6searchlight 1 0.1 8.85 0.885 38.3 3.83keel plate 0.67 0.055 0.03685 28.938 19.38846

bottom plate 3.2 0.055 0.176 28.938 92.6016bilge plate 3.23 0.53 1.7119 30 96.9shell plate 3.48 3.6 12.528 30 104.4

pipes, pumps & acessories 1.9 3.5 6.65 28.938 54.9822bracket 0.3 3.5 1.05 29.29 8.787

Deck Girder 4 0.87 8.9 7.743 29.29 25.4823Deck Longitudinal 12 1.75 8.9 15.575 29.29 51.2575

Side Stringer 3 0.97 3.7 3.589 29.29 28.4113Side Longitudinal 10 0.69 3.7 2.553 29.29 20.2101

Centre Girder 1 0.58 0.55 0.319 29.29 16.9882 Side girder 4 1.85 0.59 1.0915 29.29 54.1865

Bottom Longitudinal 12 0.89 0.06 0.0534 29.29 26.0681Inner Bottom Longitudimal 10 0.95 0.97 0.9215 29.29 27.8255

Collision Bulkhead 1 5.73 3.96 22.6908 33.6 192.528Wash Bulkhead 1 3.49 3.96 13.8204 35 122.15

Bulkhead Stiffener 12 1.85 4 7.4 30 55.5Web Frame 4 0.41 2.97 1.2177 31.185 12.78585web floor 4 2.34 0.57 1.3338 31.185 72.9729

web floor stiffener 24 0.35 0.57 0.1995 31.9 11.165inner bottom plate 6.05 1.004 6.0742 31.96 193.358

Deck Beam 4 0.95 8.9 8.455 31.185 29.62575

TOTAL 60.55 245.36455 1918.76926

NAME OF ITEMS

 

WEIGHT OF ITEMS VCG about KEEL

 

LCG about AMIDSHIP MOMENT about AMIDSHIPQUANTITY OF

ITEMSMOMENT aboutt

KEEL

RUNPROPELLER 1 1.9 1.28 2.432 -34.4 -65.36PROPELLER SHAFT 1 0.95 1.27 1.2065 33.4 31.73

RUDDER & STEERING ARRANGEMENT 1 2.35 3.32 7.802 -34.793 -81.76355ENGINE 1 4.5 1.5 6.75 -28.792 -129.564GEAR BOX 1 1.75 1.29 2.2575 -29.9 -52.325TRANSVERSE BULKHEAD 2 7.75 3.13 24.2575 -29.9 -231.725Wood , Outfits & accessories 70 10.2 714 -27.7 -1939STAIRS & RAILING 2 12.5 25 -28.5 -57FUNNEL & MAST 1.5 14.6 21.9 -36 -54BOLLARD & CAPSTAN 6 1 6.9 6.9 -35.96 -35.96MOORING ROPES 1.2 6.9 8.28 -31.13 -37.356HATCH & HATCH COAMING 2.5 6.4 16 -28.78 -71.95Auxiliary Machinery 2.9 2.1 6.09 -26.4 -76.56Generator 3 2.3 6.9 -26.6 -79.8

Engine Foundtion Scantling Weight 2.6 1.1 2.86 -28.153 -73.1978 Deck Beam 6 1.34 5.94 7.9596 -30.191 -40.45594

Deck Girder 4 1.4268 5.94 8.475192 -30.191 -43.0765188Deck Longitudinal 12 2.3 5.94 13.662 -30.191 -69.4393

Side Stringer 4 1.56 2.587 4.03572 -30.191 -47.09796Side Longitudinal 8 1.17 2.587 3.02679 -30.191 -35.32347

Centre Girder 1 1.3 0.55 0.715 -30.191 -39.2483 Side girder 4 4.24 0.59 2.5016 -30.191 -128.00984

Bottom Longitudinal 12 1.28 0.06 0.0768 -30.191 -38.64448Inner Bottom Longitudimal 10 1.28 0.97 1.2416 -30.191 -38.64448

Bulkhead Stiffener 12 2.1 3.56 7.476 -30.191 -63.4011Web Frame 6 1.01 2.97 2.9997 -30.191 -30.49291web floor 6 7.12 0.55 3.916 -30.191 -214.95992

web floor stiffener 48 0.55 0.55 0.3025 -30.191 -16.60505bracket 64 0.65 3.6 2.34 -30.191 -19.62415

deck plate 12.1 5.94 71.874 -27.2 -329.12keel plate 1.46 0.055 0.0803 -28.193 -41.16178

bottom plate 7.84 0.055 0.4312 -30.2 -236.768bilge plate 7.69 0.53 4.0757 -29.1 -223.779shell plate 9.476 3.6 34.1136 -29.1 -275.7516

pipes, pumps & acessories 4.2 3.2 13.44 -35.9 -150.78OTHERS 3.5 3.1 10.85 -34 -119

inner bottom plate 5.8 1.004 5.8232 -31.5 -182.7

Super Structure        

Deck Girder 10 2.78 10.14 28.1892 -27.29 -75.8662

Deck Longitudinal 24 1.95 10.14 19.773 -27.29 -53.2155

Deck Plate 3 19.6 10.9 213.64 -26.5 -519.4

Side Stringer 8 0.982 10.4 10.2128 -32.952 -32.358864

Side Longitudinal 14 2.01 10.36 20.8236 -32.952 -66.23352

Superstructure Shell Plate 14.15 10.13 143.3395 -31.9 -451.385

FRONT &back plate 14.2 11.17 158.614 -32.5 -461.5

roof of wheel house 1 0.9 13 11.7 -27.29 -24.561

TOTAL 241.8648 1658.344102 -7022.435233

NAME OF ITEMS WEIGHT OF ITEMS VCG about KEEL LCG about AMIDSHIP MOMENT about AMIDSHIPQUANTITY OF

ITEMSMOMENT aboutt

KEEL

SUMMARY

Total Light Weight 712.7 tonne

COMBINED LCG OF ALL STRUCTURES FROM AMIDSHIP -5.78661

Total Dead Weight 2900 tonne

COMBINED VCG OF ALL STRUCTURES ABOVE KEEL 4.127723

Displacement 3612.7 tonne

Deadweight Calculation

Tank Name Capacity LCG from midship

VCG from keel

Oil Tank 1 359.4881 27.277 3.47Oil Tank 2 485.0664 23.7 3.47Oil Tank 3 519.456 8.4 3.47Oil Tank 4 485.52 -0.91 3.47Oil Tank 5 517.8701 -10.2 3.47Oil Tank 6 522.1776 -19.85 3.47Aft Peak Tank 11.67274 -38.663 4.802763Fore Peak Tank 34.458 33 3.732544Ballast Tank 1 88.02 27 0.5Ballast Tank 2 129.7536 17.97 0.5Ballast Tank 3 138.88 8.3 0.5Ballast Tank 4 131.3325 -0.9 0.5Ballast Tank 5 139.968 -10.217 0.5Ballast Tank 6 135.8864 -19.797 0.5

LCG & VCG at Load WaterlineBALLAST WATER WEIGHT     418.5 tonnes   BALLAST WATER WEIGHT    

418.5tonnes 

TOTAL MOMENT OF ALL BALLAST TANK ABOUT AMIDSHIP-4662.362 tonnes-m   TOTAL MOMENT OF ALL BALLAST TANK ABOUT KEEL

259.65 tonnes-m 

                            

TOTAL WEIGHT OF OIL IN ALL OIL TANKS  2427.245 tonnes

  TOTAL WEIGHT OF OIL IN ALL OIL TANKS  

2427.245 tonnes 

TOTAL MOMENT OF ALL OIL TANK ABOUT AMIDSHIP  

9575.94 tonnes-m

  TOTAL MOMENT OF ALL OIL TANK ABOUT KEEL  

10026.84 tonnes-m 

                            WEIGHT OF OTHER DEADWEIGHT ITEM    

30 tonnes   WEIGHT OF OTHER DEADWEIGHT ITEM  

30 tonnes TOTAL MOMENT OF OTHER DEADWEIGHT ITEMS ABOUT AMIDSHIP

-1050 tonnes-m  

TOTAL MOMENT OF OTHER DEADWEIGHT ITEMS ABOUT AMIDSHIP

118.8 tonnes-m 

                            TOTAL WEIGHT OF STRUCTURAL ITEMS IN THE SHIP  

712.7 tonnes   TOTAL WEIGHT OF STRUCTURAL ITEMS IN THE SHIP

712.7 tonnes 

TOTAL MOMENT OF STRUCTURAL ITEMS IN THE SHIP

-4122.335 tonnes-m

   TOTAL MOMENT OF STRUCTURAL ITEMS IN THE SHIP

2940.54 tonnes-m 

                                                        LCG OF THE WHOLE SHIP ABOUT AMIDSHIP     -0.072108

m aft of amidship VCG OF THE WHOLE SHIP ABOUT KEEL   3.719 mm

Stability Calculation And GZ Curves

GZ Curve at Lightweight Condition

0 10 20 30 40 50 60 70 80 90 100-1.5-0.50.51.52.53.54.5

WL-1

WL-1

Angle

GZ

Angle Of Vanishing Stability 85.5 DegreeInitial GM 19.3 m Comparison With IMO Stability Criteria

Properties IMO value WLArea up to 30 degree (m-rad) ≥ 0.055 1.9897Area up to 40 degree (m-rad) ≥ 0.09 3.3800

GZ at 30 degree (m) ≥ 0.2 3.4000Max. GZ at (degree) ≥ 30 (preferable) but not ≤ 25 45

GZ Curve at Ballast Condition

0.000 10.000 20.000 30.000 40.000 50.000 60.000 70.000 80.000 90.000 100.000

-2.000

-1.000

0.000

1.000

2.000

3.000

4.000

5.000

Series1

Angle Of Vanishing Stability 87 DegreeInitial GM 5.750 m Comparison With IMO Stability Criteria

Properties IMO value WLArea up to 30 degree (m-rad) ≥ 0.055 0.969Area up to 40 degree (m-rad) ≥ 0.09 1.350

GZ at 30 degree (m) ≥ 0.2 3.700Max. GZ at (degree) ≥ 30 (preferable) but not ≤ 25 39.640

GZ Curve at Full Load Condition

0.000

20.00

040

.000

60.00

080

.000

100.0

00

-1.000-0.5000.0000.5001.0001.5002.000

Series1

Angle Of Vanishing Stability 80 DegreeInitial GM 3.725mIMO Stability criteria And Comparison

Area up to 30 degree (m-rad) ≥ 0.055 0.432Area up to 40 degree (m-rad) ≥ 0.09 0.716

GZ at 30 degree (m) ≥ 0.2 1.650Max. GZ at (degree) ≥ 30 (preferable) but not ≤ 25 33.600

Trim Calculation

We Know That,TRIM=(LCG-LCB)*∆ /MCT 1mChange in Draft Aft=(L/2-CF)*Trim/LFinal Draft Aft=Draft+Change in Draft AftFinal Draft Forward=Draft-Change in Draft Aft

Displacement 3588 tonne LOA 76.2 mDraft 3.96 mLCG 0.072 m(aft)LCB -0.816m(fore) MCT 1m 4932.77 tonne - m LCF 0.046 m Trim 0.645913756 m Aft Trim 0.322566956 mFore Trim 0.213897224 mAft Draft 4.282566956 mFore draft 3.746102776 m

So the ship is trimmed by stern

Thank You…