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Pontoon Scantling

1. The document provides design specifications for the scantling of a breasting pontoon. Key dimensions of the pontoon include a length of 8m, breadth of 4m, and maximum loaded draft of 0.5m. 2. Calculations are presented for determining the minimum required plate thicknesses of various pontoon components, including the deck, bottom, and side plating, based on structural standards. 3. Section modulus calculations are also shown for transverse and longitudinal girders and stiffeners to check their adequacy based on span, spacing, applied pressure and strength standards. Corrosion allowance of 3mm is considered for all components.

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376 views4 pages

Pontoon Scantling

1. The document provides design specifications for the scantling of a breasting pontoon. Key dimensions of the pontoon include a length of 8m, breadth of 4m, and maximum loaded draft of 0.5m. 2. Calculations are presented for determining the minimum required plate thicknesses of various pontoon components, including the deck, bottom, and side plating, based on structural standards. 3. Section modulus calculations are also shown for transverse and longitudinal girders and stiffeners to check their adequacy based on span, spacing, applied pressure and strength standards. Corrosion allowance of 3mm is considered for all components.

Uploaded by

Dammy
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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PROJECT NO.

ACTIVITY Marine Facilities


PROJECT Breasting Pontoon Design FILE
SUBJECT Pontoon Scantling SHEET OF
####

REVISION DATE BY CHECKED APPROVED REVISION DATE BY 1


CHECKED APPROVED4 .
06/08/2021 BAL BAL

1. PONTOON DESIGN

1.1 Pontoon Data


Pontoon Length = 8 m
Pontoon Breadth = 4 m
Ponroon Depth = 1.5 m
Maximum Loaded Draft, hs = 0.5 m
Maximum Stiffner Spacing = 0.7 m
f 1
Stiffner Span 1 m
Corrossion Allowance 3 mm

Environment Data 1.5 m


Water Depth = 6 m
Water Density = 1025 kg/m3

1.2. Pontoon Scantling


1.2.1 Plating
The minimum deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Minimum Plate Thickness td = t = s√LD/f1 (mm) 2.0 mm

1.2.2 Bottom Plating


The minimum bottom plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk 5.0 mm
Spacing = 0.7 m
ka = (1.1 - 0.25*s/l)2 1.0 (min, 07.2. max, 1.0)
P = ρgh 5.0 kPa
σ = 160ƒ1 160 MPa

1.2.3 Deck Plating


The minimum Deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk 5.0 mm
Spacing = 0.7 m
ka = (1.1 - 0.25*s/l)2 1.0 (min, 07.2. max, 1.0)
P = ρgh 5.0 kPa
σ = 160ƒ1 160 MPa
PROJECT NO.
ACTIVITY Marine Facilities
PROJECT Breasting Pontoon Design FILE
SUBJECT Pontoon Scantling SHEET OF
####

REVISION DATE BY CHECKED APPROVED REVISION DATE BY 2


CHECKED APPROVED4 .
06/08/2021 BAL BAL

1.2.4 Transverse Side Plating (Aft & Bow)


The minimum Deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk 5.0 mm
Spacing = 0.7 m
ka = (1.1 - 0.25*s/l)2 1.0 (min, 07.2. max, 1.0)
P = ρgh 5.0 kPa
σ = 160ƒ1 160 MPa
1.2.4 Midship Plating
The minimum Deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk 5.0 mm
Spacing = 0.7 m
ka = (1.1 - 0.25*s/l)2 1.0 (min, 07.2. max, 1.0)
P = ρgh 5.0 kPa
σ = 160ƒ1 160 MPa

1.2.5 Longitudinal Side Plating (Port&Starboard)


The minimum Deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk = 4.1 mm
Spacing = 0.4 m
ka = (1.1 - 0.25*s/l)2 = 1.0 (min, 07.2. max, 1.0)
P = ρgh = 5.0 kPa
σ = 160ƒ1 = 160 MPa

1.2.6 Longitudinal Bulkhead Plating


The minimum Deck plate thickness is calculated as per DNVGL-RU-FD-Sec. 7.3.1.2
Bottom Plate Thickness = t=15.8kas√P/σ+tk = 4.4 mm
Spacing = 0.5 m
ka = (1.1 - 0.25*s/l)2 = 1.0 (min, 07.2. max, 1.0)
P = ρgh = 5.0 kPa
σ = 160ƒ1 = 160 MPa
PROJECT NO.
ACTIVITY Marine Facilities
PROJECT Breasting Pontoon Design FILE
SUBJECT Pontoon Scantling SHEET OF
####

REVISION DATE BY CHECKED APPROVED REVISION DATE BY 3


CHECKED APPROVED4 .
06/08/2021 BAL BAL

1.2.7 Girders and Stiffeners Check


Bottom & Deck Tranverse Girder
The minimum section modulus of the bottom girder is calculated as per DNVGL-RU-FD-Sec.
7.3.2.1
The minimum section modulus, Z = (1000/σm)l2spwk = 16.2 cm3
Girder Span l = 2 m
Girder Spacing s 1.375 m
m = 10

p=ρgh 5.028 kPa


σ = 160ƒ1 = 222.4 MPa
f1 = 1.39
w = 1 + 0.05(tkw + tkf) = 1.3
tkw, tkf = 3 mm

1.2.8 Bottom & Deck Longitudinal Stiffeners


The minimum section modulus of the bottom girder is calculated as per DNVGL-RU-FD-Sec.
7.3.2.1
The minimum section modulus, Z = (1000/σm)l2spwk = 3.9 cm3
Stiffener Span l = 1.375 m
Stiffener Spacing s 0.7 m
m = 10
p=ρgh 5.028 kPa
σ = 160ƒ1 = 222.4 MPa
f1 = 1.39
w = 1 + 0.05(tkw + tkf) = 1.3
tkw, tkf = 3 mm

1.2.9 Transverse & Midship Stiffeners


The minimum section modulus of the bottom girder is calculated as per DNVGL-RU-FD-Sec.
7.3.2.1
The minimum section modulus, Z = (1000/σm)l2spwk = 4.6 cm3
Stiffener Span l = 1.5 m
Stiffener Spacing s 0.7 m
m = 10
p=ρgh 5.028 kPa
σ = 160ƒ1 = 222.4 MPa
f1 = 1.39
w = 1 + 0.05(tkw + tkf) = 1.3
tkw, tkf = 3 mm
PROJECT NO.
ACTIVITY Marine Facilities
PROJECT Breasting Pontoon Design FILE
SUBJECT Pontoon Scantling SHEET OF
####

REVISION DATE BY CHECKED APPROVED REVISION DATE BY 4


CHECKED APPROVED4 .
06/08/2021 BAL BAL

1.2.10 Longitudinal Side Stiffeners


The minimum section modulus of the bottom girder is calculated as per DNVGL-RU-FD-Sec.
7.3.2.1
The minimum section modulus, Z = (1000/σm)l2spwk = 2.1 cm3
Stiffener Span l = 1.375 m
Stiffener Spacing s 0.375 m
m = 10
p=ρgh 5.028 kPa
σ = 160ƒ1 = 222.4 MPa
f1 = 1.39
w = 1 + 0.05(tkw + tkf) = 1.3
tkw, tkf = 3 mm

1.2.11 Longitudinal Bulkhead Side Stiffeners


The minimum section modulus of the bottom girder is calculated as per DNVGL-RU-FD-Sec.
7.3.2.1
The minimum section modulus, Z = (1000/σm)l2spwk = 2.8 cm3
Stiffener Span l = 1.375 m
Stiffener Spacing s 0.5 m
m = 10
p=ρgh 5.028 kPa
σ = 160ƒ1 = 222.4 MPa
f1 = 1.39
w = 1 + 0.05(tkw + tkf) = 1.3
tkw, tkf = 3 mm

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