A Presentation on the design of an 2900 DWT OIL TANKER Supervised by Dr. MD. Sadiqul Baree Professor Department of Naval Architecture & Marine Engineering , BUET Designed by Mohammad Kifayath Chowdhury Student No: 1112023 Mahmudur Rahman Student No: 1112049
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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)
=.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
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