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BANGLADESH UNIVERSITY OF ENGINEERING & TECHNOLOGY NAME 338 SHIP DESIGN PROJECT & PRESENTATION-II DATE-25 OCTOBER,2010

Watertaxi 2-2nd Project Presentation-BUET

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Page 1: Watertaxi 2-2nd Project Presentation-BUET

BANGLADESH UNIVERSITY OF ENGINEERING & TECHNOLOGY

NAME 338SHIP DESIGN PROJECT & PRESENTATION-IIDATE-25 OCTOBER,2010

Page 2: Watertaxi 2-2nd Project Presentation-BUET

DESIGN OF A WATER TAXI FOR 95 PASSENGERS IN SADARGHAT-ASHULIA ROUTE

Project SupervisorKhabirul Haque ChowdhuryProfessorDepartment of Naval Architecture & Marine Engineering,BUET

Presented By-Hasib-Ul-Haque (0712014)Ahmad Shibli Saleheen (0712018)

Page 3: Watertaxi 2-2nd Project Presentation-BUET

OBJECTIVES

To take advantage of Dhaka city’s circular waterway. To ease the water way communication with comfortable

service. To reduce the pressure on land transport. To safe people from horrible traffic jam. To establish a modern transport system which is more.

safe, affordable, technologically dependable, environment friendly, and acceptable to all citizens of the country.

Page 4: Watertaxi 2-2nd Project Presentation-BUET

THE TOPICS OF OUR SECOND PRESENTATION INCLUDES-

SCANTLING

DETAIL DEADWEIGHT & LIGHTWEIGHT CALCULATION

STABILITY & TRIM CALCULATION

Page 5: Watertaxi 2-2nd Project Presentation-BUET

PRINCIPAL PARTICULARS

Length over all (LOA) 25.79 m

Length between perpendicular (LBP)

24.3 m

Breadth mld. (B) 6.3 m

Depth mld. (D) 2.6 m

Draft (T) 1.5 m

Dispalcement (Δ) 123.48 tons

Page 6: Watertaxi 2-2nd Project Presentation-BUET

GENERAL ARRANGEMENT

Page 7: Watertaxi 2-2nd Project Presentation-BUET

GENERAL ARRANGEMENT

Page 8: Watertaxi 2-2nd Project Presentation-BUET

SCANTLING CALCULATIONWe have used ISSA rule book for our scantling calculation

MEMBER DIMENSION (in mm)

Centre Keelson T-219×55×5.5

Side Keelson T-199×55×5.5

Floor T-219×55×5.5

Main Frame L-75×50×5

Web Frame T-128×50×5

Side Stringer T-128×50×5

Deck Web L-128×50×5

Deck Beam L-90×60×6

Deck Girder T-128×50×5

Page 9: Watertaxi 2-2nd Project Presentation-BUET

SCANTLING CALCULATION

MEMBER DIMENSION (in mm)

Roof Centre Girder L-60×40×5

Roof Beam L-60×40×5

Bracket L-75×75×5

Page 10: Watertaxi 2-2nd Project Presentation-BUET

SCANTLING CALCULATION

PLATE THICKNESS (in mm)

Keel Plate 7

Bottom Plate 7

Bilge Plate 7

Side shell Plate 6

Deck Plate 6

Bracket 5

Transverse Bulkhead 4

Page 11: Watertaxi 2-2nd Project Presentation-BUET

MIDSHIP CONSTRUCTION

Page 12: Watertaxi 2-2nd Project Presentation-BUET

MIDSHIP CONSTRUCTION

Page 13: Watertaxi 2-2nd Project Presentation-BUET

MIDSHIP CONSTRUCTION

Page 14: Watertaxi 2-2nd Project Presentation-BUET

DEADWEIGHT CALCULATION

Page 15: Watertaxi 2-2nd Project Presentation-BUET

DEADWEIGHT CALCULATION

No of person on board:No of passenger = 100

No of crew = 6

Total = 106

Weight allowance per person:Weight per person = 75 kg

Luggage per person = 5 kg

Total = 80 kg

Total weight for persons = 80× 106 = 8.48 tons

Page 16: Watertaxi 2-2nd Project Presentation-BUET

CAPACITY CALCULATION

Page 17: Watertaxi 2-2nd Project Presentation-BUET

SAMPLE CALCULATION OF FRESH WATER TANK (PORT & STARBOARD

SIDE)

Area of

Station

SM Volume Functio

n

Lever Moment function

about left Wall

2.066 1 2.066 0 0

2.154 4 8.616 1 8.616

2.081 1 2.081 2 2.081

12.76 10.697Station spacing = 1.575 m Volume of tank= 6.7 m3 Weight of fresh water= 6.7 tons

Page 18: Watertaxi 2-2nd Project Presentation-BUET

SAMPLE CALCULATION OF FUEL TANK (PORT & STARBOARD SIDE)

Area of

station

SM Volume Functio

n

Lever Moment function

about left wall

3.32 1 3.32 0 0

3.723 4 14.892 1 14.892

4.132 1 4.132 2 8.264

23.156Station spacing = 1.8 mVolume of tank= 0.83 m3 Weight of disel oil= 0.75 tons

Page 19: Watertaxi 2-2nd Project Presentation-BUET

SUMMARY OF DEADWEIGHT

TYPE DEADWEIGHT (tons)

Persons 8.48

Fuel oil 1.5

Lube oil 0.5

Fresh water 3

Storage 2

Allowance 2

Total deadweight 17.48

Page 20: Watertaxi 2-2nd Project Presentation-BUET

LIGHTWEIGHT CALCULATION

Page 21: Watertaxi 2-2nd Project Presentation-BUET

SHELL EXPANSION

Page 22: Watertaxi 2-2nd Project Presentation-BUET

CALCULATION OF WEIGHT OF PLATES

MEMBER AREA (m²) THICKNESS (m)

WEIGHT (tons)

Shell plate 45.28 6 4.24

Bilge Plate 29.41 7 3.21

Keel Plate 12.72 7 1.39

Bottom plate 22.54 7 2.46

Total =11.3

Page 23: Watertaxi 2-2nd Project Presentation-BUET

WEIGHT OF OTHER ITEMSITEM WEIGHT (tons)

Centre keelson 0.94

Side keelson 2.37

Floor plate 4.24

Main frame 6.24

Web frame 5.38

Side stringer 1.54

Deck girder 0.814

Deck web 3.69

Deck beam 1.97

Deck plate 1.34

Roof girder 1.22

Roof beam 0.86

Bracket 0.6

Page 24: Watertaxi 2-2nd Project Presentation-BUET

WEIGHT OF OTHER ITEMSBulkhead 1(st .5) 0.19

Bulkhead 2(st 2) 0.25

Bulkhead 3(st 4) 0.32

Bulkhead 4(st 5) 0.33

Bulkhead 5(st 7) 0.25

Bulkhead 6(st 8.5) 0.18

Gear box 0.8

Propeller 0.55

Propeller shaft 0.6

Rudder 0.4

Winch 0.5

Anchor 1

Pump 0.12

Main engine 0.510

Seating arrangement 5

Wood and outfit 5

Glass of window 2

Generator 0.726

Miscellaneous 5

Total 57.2

Page 25: Watertaxi 2-2nd Project Presentation-BUET

So,the total lightweight of the vessel is = (11.3+61.25) tons

= 72.55 tons

Therefore,

the displacement of the vessel= Lightweight+Deadweight

= 72.55 + 44.96

= 117.51 tons

Which was previously 123.48 tons

Page 26: Watertaxi 2-2nd Project Presentation-BUET

STABILITY & TRIM CALCULATION

Page 27: Watertaxi 2-2nd Project Presentation-BUET

STABILITY CALCULATION

ANGLE OF INCLINATION(degree)

RIGHTING LEVER,GZ (m)

0 0

15 1.378

30 2.167

45 2.170

60 1.7

75 0.94

90 -0.38

Page 28: Watertaxi 2-2nd Project Presentation-BUET

GZ SAMPLE CALCULATION AT 30°INCLINATIONImmerged

Side

Section

Ordinate

Multiplier

s

Functions of Ordin

ate

Square of ordina

tes

Functions of

Squares

Cubes of

Ordinates

Functions of cubes

0 2.513 0.5 1.257 6.315 3.158 15.870 7.935

0.5 2.513 2 5.026 6.315 12.630 15.870 31.740

1 2.513 1 2.513 6.315 6.315 15.870 15.870

1.5 2.513 2 5.026 6.315 12.630 15.870 31.740

2 2.513 1.5 3.770 6.315 9.473 15.870 23.805

3 2.513 4 10.052 6.315 25.261 15.870 63.480

4 2.513 2 5.026 6.315 12.630 15.870 31.740

5 2.513 4 10.052 6.315 25.261 15.870 63.480

6 2.477 2 4.954 6.136 12.271 15.198 30.395

7 2.477 4 9.908 6.136 24.542 15.198 60.791

8 2.477 1.5 3.716 6.136 9.203 15.198 22.797

8.5 2.477 2 4.954 6.136 12.271 15.198 30.395

9 2.477 1 2.477 6.136 6.136 15.198 15.198

9.5 2.477 2 4.954 6.136 12.271 15.198 30.395

10 0 0.5 0 0.000 0.000 0.000 0

73.684 184.052 459.762

Emmersed Side

Section

Ordinate

Multipliers

Functions of Ordina

te

Square of ordinates

Functions of Square

s

Cubes of

Ordinates

Functions of cubes

0 0.546 0.5 0.273 0.298 0.149 0.163 0.081

0.5 1.012 2 2.024 1.024 2.048 1.036 2.073

1 1.390 1 1.390 1.932 1.932 2.686 2.686

1.5 1.754 2 3.508 3.077 6.153 5.396 10.792

2 2.028 1.5 3.042 4.113 6.169 8.341 12.511

3 2.362 4 9.448 5.579 22.316 13.178 52.711

4 2.574 2 5.148 6.625 13.251 17.054 34.108

5 2.577 4 10.308 6.641 26.564 17.114 68.455

6 2.279 2 4.558 5.194 10.388 11.837 23.674

7 1.853 4 7.412 3.434 13.734 6.362 25.450

8 1.417 1.5 2.126 2.008 3.012 2.845 4.268

8.5 1.138 2 2.276 1.295 2.590 1.474 2.948

9 0.839 1 0.839 0.704 0.704 0.591 0.591

9.5 0.490 2 0.980 0.240 0.480 0.118 0.235

10 0 0.5 0 0 0 0 0

53.332 109.491

240.581459.76

2

 700.343

Page 29: Watertaxi 2-2nd Project Presentation-BUET

GZ SAMPLE CALCULATION AT 30° INCLINATION

Inclinations of radial

planes

Functions of squares

of ordinates(Immersed

Side)

Functions of squares

of ordinates(Emmersed

Side)

Multipliers

Functions of squares of

ordinates for volumes of

wedges(Immersed Side)

Functions of squares of

ordinates for volumes of

wedges(Emmersed Side)

Sums of functions

of cubes of ordinates for both

side

Products of sums of

functions of cubes for both

sides

Cosines of inclinations

of radial planes

(cos(15-0 to 15))

Functions of cubes for

moments of wedges

0 214.4562 332.1834 1 214.4562 332.1834 1936.01 1936.01 0.866 1676.634

15 270.5914 166.3982 4 1082.365 665.5929 1293.792 5175.166 0.966 4998.827

30 184.052 109.4907 1 184.052 109.4907 700.3431 700.3431 1.000 700.343

1480.874 1107.267 7375.80393

AREA AND POSITION OF C.G. OF RADIAL PLANE

Function of area

Funcion of moment

Immersed 73.6835 184.052Emerged 53.3315 109.4907Summation and diff 127.015 74.56133

Area(1/3*2.43*127.015*2) =205.764 m² CG of radial plane immersed side =0.294 mThicknes of the layer(Volume/Area) =0.128 m

Volume of Immersed wedge= 1480.874 m3

Volume of Emerged wedge= 1107.267 m3

Difference= 373.6067 m3

Volume of the Layer(1/2*(1/3*2.43)*(1/3*.2616)*373.607)*2= 26.39352 m3

Uncorrected moment (1/3*(1/3*2.43)*(1/3*.2616)*7375.8393)*2 =347.40Correction for layer (CG*volume) =7.747Difference =339.653Volume of Displacement in m³ =123.48BR=(moment difference/displacement in m³) =2.75067BG=(KG-KB) =0.74GZ=BR-BGsin 30° =2.17 m

V.C.G from keel= 2.08 mKB = 0.92 m

Page 30: Watertaxi 2-2nd Project Presentation-BUET

GZ CURVE

0 10 20 30 40 50 60 70 80 90 100

-1

-0.5

0

0.5

1

1.5

2

2.5

Angle of inclination

GZ

(m

)

Page 31: Watertaxi 2-2nd Project Presentation-BUET

COMPARISON WITH IMO 167 REGULATION FOR STABILITY CRITERIA

CRITERIA REQUIRED OBTAIN

Area from 0 to 30 deg.

0.055 m rad 0.64 m rad

Area from 0 to 40 deg.

0.09 m rad 1.03 m rad

Area from 30 to 40 deg.

0.03 m rad 0.387 m rad

GZ at 30 deg. 0.2 m 2.17 m

Angle of max. GZ ≥25 deg 36 deg.

GM value (min.) for L≤70

0.35 m 1.96 m

Page 32: Watertaxi 2-2nd Project Presentation-BUET

TRIM CALCULATION

LCB At LWL = 1.12 m aft of amidshipLCG of total ship = 1.29 m aft of amidshipDisplacement of the Ship = 123.48 tonneAt LWL, MCT1m = 189.77 tonne-m C.F. = 1.22 m aft of amidship Draft = 1.5 m[The value of LCB,MCT1m,C.F. are taken from the Hydrostatic Calculations earlier in the design procedure]

Page 33: Watertaxi 2-2nd Project Presentation-BUET

TRIM CALCULATION

Now,Amount of Trim={(1.29-1.12)*123.48}/189.77

= 0.1106 m So,

Change in Trim aft= 0.05 mChange in Trim Forward= 0.06 m

Therefore, resulting

Draft Forward= 1.5+0.06 = 1.56 m

Draft Aft= 1.5- 0.05 = 1.45 m

Page 34: Watertaxi 2-2nd Project Presentation-BUET

THANK YOU