887-B399-01_ABS Structural Scantlings Calculations_Rev(-)_signed.pdf

NSF MCMURDO OFFLOAD INFRASTRUCTURE 9 June 2023 ABS Structural Scantlings Report 1 Doc. 887-B399-01, Rev -

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

PREPARED FOR:

Moffatt & Nichol Seattle, WA

BY:

Zenzile Z. Moore, PE

NAVAL ARCHITECT

CHECKED:

Andrew L. Girdler, PE

SENIOR NAVAL ARCHITECT

APPROVED:

Bradley G. Lamkin, PE

PRINCIPAL-IN-CHARGE

DOC. #:

887-B399-01

REV:

FILE:

22105.01

DATE:

9 June 2023

References

1. US Army Corps of Engineers, Scope of Work 3438 NSF McMurdo Station Offload Infrastructure Project Contract Level Design and Specification, MDC Project 3438, W912EE-21-D-0005, Tracking Number 0001.

2. ABS Steel Barge Rules, 2023.

3. ABS Marine Vessel Rules, 2023.

4. IACS Blue Book, Structural Requirements for Polar Class Ships, International Association of Classification Societies, UR-I, Rev 4, December 2019.

5. Glosten, NSF McMurdo Offload Infrastructure, ABS Design Methodology and Parameters, 887-B003-01.

6. Glosten, NSF McMurdo Offload Infrastructure, Longitudinal Hull Girder Strength Report, 887-B399-06.

7. Glosten, NSF McMurdo Offload Infrastructure, Finite Element Analysis Report, 887-B399-05.

8. Glosten, Deck and Bottom Structure, 887-B307-01.

9. Glosten, Longitudinal Structure, 887-B311-01.

10. Glosten, Transverse Structure, 887-B309-01.

11. Glosten, Side Plating, 887-B307-02.

12. NSF, Vehicle-Bridge Use Information, Vehicle-Bridge Use Information.pdf, 5 May 2022.

13. Glosten, 887_ABS Structure Calcs_Rev(-).xlsm.

14. Glosten, 887_ABS Local Scantling Buckling Calcs_Rev(-).xlsx.

Revision History

Section Rev Description Date Approved

Summary

The United States Army Corps of Engineers (USACE) is supporting the US National Science Foundation (NSF) to develop a contract level design for the permanent offload infrastructure to support resupply operations at McMurdo Station, Antarctica (Ref. 1). This report presents the

ABS Structural Scantlings Report 2 Doc. 887-B399-01, Rev -results of the structural scantling calculations for the barge-like floating pier (barge) component of the proposed infrastructure.

Two structural requirements govern the size and arrangement of scantlings on the barge:

• Steel Barge requirements from the American Bureau of Shipping (ABS, Ref. 2) as the pier barge will be a classed deck barge.

• Polar Class requirements from the International Association of Classification Societies

(IACS, Ref. 4, and incorporated by reference and published in the ABS Marine Vessel

Rules, Ref. 3) as the pier barge resides in a polar environment.

The calculations herein show that the proposed scantlings of the vessel (Ref. 8 through 11) satisfy the ABS Steel Barge and IACS Polar Class requirements.

Calculations

In these structural calculations, “bottom” refers to the region comprised of the flat bottom, side rake, and end rake.

The barge has longitudinal deck beams at 16" typical spacing (24" maximum) supported by deck transverses at 64" spacing (Ref. 8). The transverse bulkheads are spaced at a maximum of 32'-0" apart. Transverse watertight bulkheads are located at Frames 7, 13, 25, 37, 49, and 55.

Longitudinal non-tight bulkheads are located at 18'-0" off centerline (OCL) port and starboard

(Ref. 9).

The barge has a length of 328'-0", and the ABS Rule length is 314.9'. The midship 0.4L spans from approximately Frame 19 to 43.

Complete details on barge ice regions are provided in Ref. 5.

The barge is to be built from minimum 50-ksi steel. The material properties of 50-ksi steel have been employed throughout the calculations. Alternately, AH36 steel has slightly higher tensile and yield strength than 50-ksi steel, and may be selected.

The proposed scantling plate thicknesses have large margins when compared to local scantling requirements. However, the plate thicknesses will satisfy global strength criteria (Ref. 6). The scantling spacings presented in these calculations represent the maximums. Actual spacings may be smaller due to other considerations like arrangements and global and local buckling. Global buckling has been considered in the global FEA (Ref. 7). Local buckling calculations are shown in Appendix F.

Calculations based on ABS Rules

All scantlings must satisfy ABS Steel Barge requirements at a minimum. The deck and supporting scantlings must also support the 2500 psf design deck load (up to the allowable deadweight).

Deck plate wheel load calculations were performed to assess the capacity of the barge deck plating to support wheel/track loading from specialized equipment on deck (Ref. 12). The following vehicles were identified as being deck design drivers:

• 70-ton Highway Truck

• Link-Belt TCC-1400 Telescopic Crawler Crane

• Link-Belt RTC-80130 Telescopic Boom Rough Terrain Crane

• Cat V 620 forklift

Calculations are provided in Appendix A.

ABS Structural Scantlings Report 3 Doc. 887-B399-01, Rev -

Calculations based on Polar Class Rules

The bottom of the barge is in contact with the ice belt, and is thus additionally governed by IACS

Polar Class requirements. A portion of the topsides must meet this requirement as well due to towing conditions (Ref. 5).

The side rake and end rake are transversely framed, with ice frames at 16" spacing supported by ice stringers at 8'-1" spacing. The flat bottom of the barge is longitudinally framed, with longitudinal frames at 16" spacing supported by bottom transverses at 64" spacing (Ref. 5 and 6).

Calculations for plating and framing in the ice regions are provided in Appendix B for Polar

Class 4 requirements, and Appendix C for Polar Class 6 requirements (skeg plating, headlog, and topsides in way of skeg, only; Ref. 5). Stringers were sized by FEA (Ref. 7).

First principles calculations

First principles calculations were conducted to assess the capacity of the barge deck framing to support wheel/track loading from the aforementioned specialized equipment.

The following limitations were identified:

• Restricted load chart for athwartships crane tracks. In order to keep loads from the

Link-Belt TCC-1400 Telescopic Crawler Crane tracks within the capacity of the deck beams, the crane is restricted to lifting over the side of the tracks if tracks run athwartships. The crane may operate unrestricted if tracks run fore/aft.

• Mats under outriggers. In order to distribute outrigger loads across multiple deck beams, mats are required beneath the outriggers of the Link-Belt RTC-80130 Telescopic

Boom Rough Terrain Crane.

Calculations are provided in Appendix D and E. Calculations show that the barge structure

(Ref. 8 through 11) is sufficient to support expected loads from the specialized vehicles.

ABS Structural Scantlings Report A-1 Doc. 887-B399-01, Rev -

Appendix A ABS Structural Scantling Calculations

ABS Scantling Summary File: 22105 Date: 9-Jun-23 By: ZZM Checked: ALG

A1 Deck Cargo Barge

LOA = 328.00 ft L = 314.88 ft

B = 100.00 ft

D = 18.00 ft d = 15.30 ft

Cb = 0.744

SBR = ABS Rules for Building & Classing Steel Barge s, 2023

Member Location Size Req'd Offered Units Margin

DECKS

Deck Plating 0.4L Amidships 0.75 in PL SBR 3.2.3/1.1 0.40 0.75 t (in) 1.9 Deck Beams 0.4L Amidships 6x4x.375 L SBR 5-1-1/3.1 6.18 13.03 SM (in3) 2.1

Deck Girders 0.4L Amidships 32 x 0.5 w/ 12 x 1 Flg T

SBR 5-1-1/7 &

3.3

430.92 479.01 SM (in3) 1.1

Deck Transverses 0.4L Amidships 24 x 7 x 0.5 FP SBR 5-1-1/7 & 3.1

143.64 167.42 SM (in3) 1.2

BOTTOM

Bottom, Amidships Bottom Plating 0.4L Amidships 1 in PL SBR 3-2-2/3.5 0.44 1.00 t (in) 2.3 Bilge Plating 0.4L Amidships 1.25 in PL SBR 3-2-2/12 0.41 1.25 t (in) 3.1 Bottom Frames 0.4L Amidships 8x.625 FB SBR 5-1-1/9 2.84 14.15 SM (in3) 5.0

Ice Frames 0.4L Amidships 10.5x1 FB SBR 5-1-1/11 5.05 36.99 SM (in3) 7.3

Bottom Girders 0.4L Amidships 48 x 0.75 w/ 12 x 1 Flg T

SBR 5-1-1/11 837.71 1062.07 SM (in3) 1.3

Bottom Ice Stringers 0.4L Amidships 37 x 15 x 1 FP SBR 5-1-1/9 124.00 905.21 SM (in3) 7.3

Bottom Web Frames 0.4L Amidships 24 x 4 x 0.375 FP SBR 5-1-1/11 69.81 102.20 SM (in3) 1.5

Bottom, Ends Forebody Bottom Plating Forebody 1 in PL SBR 3-2-2/5.3 0.49 1.00 t (in) 2.0 Forebody Ice Frames Forebody 9.5x1 FB SBR 3-2-5/3.5 4.06 29.47 SM (in3) 7.3

Forebody Ice Stringers Forebody 37 x 15 x 1 FP SBR 3-2-5/3.7 117.08 886.43 SM (in3) 7.6

ABS Rule

Rules for Building and Classing, Steel Barges, January 2023

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

A-2 ABS Calculations: Scantling Summary

GLOSTEN | 9 June 2023 Doc. 887-B399-01, Rev -

Member Location Size Req'd Offered Units MarginABS Rule

BULKHEADS

Collision Bulkhead Frame 4, Frame 58 sim.

Collision Bhd Plating - 0.375 in PL SBR 3-2-6/5.1 0.24 0.38 t (in) 1.6 Vertical Stiffeners Mid 5x3.5x.3125 L SBR 3-2-6/5.3 2.6 7.28 SM (in3) 2.8

Vertical Stiffeners Wing, Inbd 5x3.5x.3125 L SBR 3-2-6/5.3 2.4 7.28 SM (in3) 3.0

Vertical Stiffeners Wing, Otbd 4x3x.3125 L SBR 3-2-6/5.3 1.5 4.93 SM (in3) 3.4

Wing Insert Pl Header - 8x4x.5 L SBR 3-2-6/5.5 11.8 23.07 SM (in3) 2.0

Wing Vertical Web IWO Ice Stringer

29'-4" OCL 12 x 2.5 x 0.4375

FP

SBR 3-2-6/5.3 9.6 29.78 SM (in3) 3.1

Wing Vertical Web IWO Ice Stringer

36' OCL 8x6x.5 L SBR 3-2-6/5.3 2.9 29.06 SM (in3) 10.1

Wing Vertical Web IWO Ice Stringer

42'-8" OCL 8 x 2.5 x 0.4375

FP

SBR 3-2-6/5.3 2.7 15.36 SM (in3) 5.6

Typical Transverse WT Bhd Frames 7, 13, 25, 37, 49, 55 Transv WT Bhd Plating - 0.3125 in PL SBR 3-2-6/5.1 0.24 0.38 t (in) 1.6 Vertical Stiffeners Mid 6x3.5x.3125 L SBR 3-2-6/5.3 9.0 9.09 SM (in3) 1.0

Vertical Stiffeners Wing, Inbd 5x3.5x.3125 L SBR 3-2-6/5.3 5.4 7.28 SM (in3) 1.3

Vertical Stiffeners Wing, Otbd 4x3x.3125 L SBR 3-2-6/5.3 1.6 4.93 SM (in3) 3.0

Vertical Web IWO Long'l Girder Mid 12 x 0.5 w/ 12 x 1 Flg T

SBR 3-2-6/5.5 3.3 72.66 SM (in3) 22.0

Wing Insert Pl Header - 8x4x.5 L SBR 3-2-6/5.5 17.7 23.07 SM (in3) 1.3

Wing Vertical Web IWO Ice Stringer

29'-4" OCL 12 x 2.5 x 0.4375

FP

SBR 3-2-6/5.3 16.2 30.35 SM (in3) 1.9

Wing Vertical Web IWO Ice Stringer

36' OCL Balanced 8 x 6 x

0.5 L

SBR 3-2-6/5.3 4.0 64.90 SM (in3) 16.3

Wing Vertical Web IWO Ice Stringer

36' OCL 8 x 2.5 x 0.4375

FP

SBR 3-2-6/5.3 2.5 15.42 SM (in3) 6.2

Typical Transverse NT Bhd Frames 19, 31, 43 NT Wing Diaphragm Bhd Frames 10, 16, 22, 28, 34, 40, 46, 52 Transv NT Bhd Plating Center 0.3125 in PL SBR 3-2-6/5.1 0.24 0.31 t (in) 1.3 NT Wing Diaphragm Bhd Plating Wing 0.375 in PL SBR 3-2-6/5.1 0.24 0.38 t (in) 1.6

Vertical Stiffeners Mid 6x3.5x.3125 L on 0.313-in PL

SBR 3-2-6/5.3 4.5 8.59 SM (in3) 1.9

Vertical Stiffeners Wing, Inbd 5x3.5x.3125 L on 0.375-in PL

SBR 3-2-6/5.3 2.7 6.95 SM (in3) 2.6

Vertical Stiffeners Wing, Otbd 4x3x.3125 L on 0.375-in PL

SBR 3-2-6/5.3 0.8 4.93 SM (in3) 6.0

Vertical Web IWO Long'l Girder Mid 12 x 0.5 w/ 12 x 1 Flg T on 0.313-in

PL

SBR 3-2-6/5.5 1.7 46.07 SM (in3) 27.9

Wing Insert Pl Header - 6x4x.3125 L on 0.375-in PL

SBR 3-2-6/5.5 8.9 10.44 SM (in3) 1.2

Wing Vertical Web IWO Ice Stringer

29'-4" OCL 8 x 2.5 x 0.4375 FP on 0.375-in PL

SBR 3-2-6/5.3 8.1 16.10 SM (in3) 2.0

Wing Vertical Web IWO Ice Stringer

36' OCL Balanced 8 x 6 x

0.5 L on 0.375-in

PL

SBR 3-2-6/5.3 2.0 29.64 SM (in3) 14.9

Wing Vertical Web IWO Ice Stringer

42'-8" OCL 8 x 2.5 x 0.4375 FP on 0.375-in PL

SBR 3-2-6/5.3 1.2 15.42 SM (in3) 12.5

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

A-3 ABS Calculations: Scantling Summary

Member Location Size Req'd Offered Units MarginABS Rule

Longitudinal NT Bhds Long'l NT Bhd Plating 0.4L Amidships 0.375 in PL SBR 3-2-6/5.1 0.24 0.38 t (in) 1.6 Vertical Stiffeners 0.4L Amidships 4x3x.3125 L SBR 3-2-6/5.3 1.8 4.68 SM (in3) 2.5

Vertical Webs (IWO Transverses)

0.4L Amidships 12 x 3 x 0.4375

FP

SBR 3-2-6/5.3 2.8 27.41 SM (in3) 9.8

Header 0.4L Amidships 5x.5 FB SBR 3-2-6/5.3 3.7 3.94 SM (in3) 1.1

Longitudinal NT Diaphragm Bhds Long'l NT Diaphragm Bhd Plating

Fore/aft 0.375 in PL SBR 3-2-6/5.1 0.24 0.38 t (in) 1.6

Vertical Stiffeners Fore/aft 4x3x.375 L SBR 3-2-6/5.3 2.8 5.39 SM (in3) 1.9

Vertical Webs (IWO Transverses)

Fore/aft 12 x 3 x 0.4375

FP

SBR 3-2-6/5.3 10.6 31.62 SM (in3) 3.0

PERMABALLAST BINS

PermaBallast Bin Structure Bin Plating 0.3125 in PL - - - - - - Vertical Side Stiffeners 3x2x.3125 L SBR 3-2-6/5.3 1.9 2.45 SM (in3) 1.3

Bottom Stiffeners (Transv) 6x4x.3125 L SBR 3-2-6/5.3 8.9 9.94 SM (in3) 1.1

Inbd Lower Panel Vert Stiffs 3x2x.3125 L SBR 3-2-6/5.3 0.9 2.44 SM (in3) 2.8

Coaming (Upper) 6x.5 FB SBR 3-2-6/5.3 4.1 5.87 SM (in3) 1.4

SIDE SHELL

Side Frames Topsides Plating 0.4L Amidships 0.5 in PL SBR 3-2-2/3.1 0.48 0.50 SM (in3) 1.0

Topsides Frames 0.4L Amidships 4.5x1 FB SBR 5-1-1/11 2.05 6.69 SM (in3) 3.3

HEAD/STERN LOG

Head Log Plating Topsides 0.875 in PL SBR 3-2-6/5.1 0.48 0.88 t (in) 1.8 Stern Log (Side Shell) Plating Topsides 0.5 in PL SBR 3-2-6/5.1 0.48 0.50 t (in) 1.0 Topsides Frames Stern 5.5x1 FB SBR 3-2-5/3.5 3.25 9.58 SM (in3) 3.0

Topsides Frames Bow 5.5x1 FB SBR 3-2-5/3.5 3.25 10.89 SM (in3) 3.4

STANCHIONS & BULKHEAD VERTICAL WEBS

Stanchions Typical Stanchion 10'' SCH 160 SBR 5-1-

1/15.3,5

285.71 320.39 W (Ltf) 1.1

FR1/FR61 Stanchion 4'' SCH 160 SBR 5-1- 1/15.3,5

47.62 70.66 W (Ltf) 1.5

Bulkhead Vertical Webs Wing Vertical Web IWO Ice Stringer

36' OCL Balanced 8 x 6 x

0.5 L on 0.313-in

PL

SBR 5-1-

1/15.3,5

166.687 225.919 W (Ltf) 1.4

Vertical Web IWO Long'l Girder Mid 12 x 0.5 w/ 12 x 1 Flg T on 0.313-in

PL

SBR 5-1-

1/15.3,5

285.714 332.586 W (Ltf) 1.2

Long'l Bulkhead Vertical Web 12 x 3 x 0.4375 FP on 0.375-in PL

SBR 5-1-

1/15.3,5

142.857 242.348 W (Ltf) 1.7

Long'l Bulkhead Vertical Web - T W 12 x 65 SBR 5-1- 1/15.3,5

95.2381 176.263 W (Ltf) 1.9

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ABS Structural Scantlings Report

A-4 ABS Calculations: Scantling Summary

Characteristics

Date: 9-Jun-23 By: ZZM Checked: ALG

Vessel Particulars Length, Overall LOA 328 ft

Breadth B 100 ft

Depth D 18 ft

Max Scantling Draft d 15.3 ft

Displaced Mass Δ 10,257 LT

Volume at Draft ∇ 358,447 ft3

Geometry File .gf 887_Rev(-).gf - Displacement, SW displ 22,976 kips (SW) Block Coefficient Cb 0.74

85% depth 15.30 ft

Length, Waterline at 85% of D LWL 328.00 ft

Length, ABS Rule L 314.88 ft

Frame Spacing (inches) sframe (in) 16.00 in

Frame Spacing sframe 1.33 ft

Frame Spacing, Max sframe_max 2.00 ft

Ice Frame Spacing (Side) sside 1.33 ft

Transverse Spacing stransverse 5.33 ft

Transverse Bulkhead Spacing sTbhd 32.00 ft

Transverse Bulkhead Stiffener Spacing sTbhd_stiff 1.33 ft

Head Log Height Dhlog 5.08 ft

Stern Log Height Dslog 5.08 ft

Deck Loads

Design Uniform Deck Load pdeck 2,500 psf

1.12 LTf/sf

Material Properties

Steel Type - 50-ksi -

Steel Yield Stress F_yield (SI) 345 N/mm2

F_yield 50,038 psi

Factor of Safety FS 1.67

(used in "Structure under Vehicles") σ_allow 29,963 psi

_allow 17,299 psi

Ultimate Tensile Strength (minimum) σ umin 485 N/mm2 s_umin 70,343 psi

Ultimate Tensile Strength (maximum) σ umax 485 N/mm2 s_umax 70,343 psi n_y n_y 34,000 psi Maximum Y Ymax 49,240 psi Y Y 49,240 psi e e 0.75 - Higher-Strength Factor (used in calculations for ABS Rules)

Q 0.76 -

Steel Density ρ_steel 0.281 lb/in^3

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ABS Structural Scantlings Report

A-5 ABS Calculations: Characteristics

ABS Rules for Building and Classing Steel Barges (SBR) Part 3 Hull Construction and Equipment

Chapter 2 Hull Structures and Arrangements

Section 2 Shell Plating

1 Shell Plating Thickness

3 Shell Plating Amidships

3.1 Side Shell Plating Amidships

toffered = ttopsides = 0.500 in PASS: Margin = 1.04 treq'd = 0.384 in = max of all required thicknesses treq'd, ABS MVR 3-2-2/3.11 = 0.480 in = max of all required thicknesses + 25% for vessels without fenders t_3-2-7 = [ sk sqrt ( qh ) / 460 ] + 0.1 in see Below t_3-2-7 = 0.25 in Required t for cargo tank bulkheads t_3.1 = 0.00084L + 0.007s in for L ≤ 492 feet t_3.1 = 0.38 in t_5.1 = 0.00018L + 0.01s + 0.087 in for L > 250 feet t_5.1 = 0.38 in where: L = 314.88 ft = Minimum of rule length and 748 ft s = 16.00 in = frame spacing q = 0.68 = 34,000 / Y h = 21.00 ft as defined in 5-2-1/3 (exception in 3-2-7/5)

Shell plating thickness is not to be less than is required for purposes of longitudinal hull girder strength in accordance with 3-2-1/3, nor is it to be less than required by the respective equations for minimum thickness of side and bottom plating in this Section. In general, after all corections are made, the shell plating thickness is not to be less than required by Section 3-2-7 for tank bulkhead plating with h to the deck at side. Where hull girder shear values are abnormal, the thickness of the side shell plating may be required to be increased.

The thickness of the side shell plating within 0.4L amidships, as defined in 3-1-1/19, is not to be less than obtained from the following equations . . .

. . . nor less than required by 3-2-2/5.1:

From 3-1-1/19:

The term Side Shell Plating Amidships refers to the plating of the side shell from the upper turn of the bilge to the deck at the side between 0.2L forward and 0.2L aft of amidships.

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ABS Structural Scantlings Report

A-6 ABS Calculations: Plating - Shell

3.1.1 Barges with Longitudinal Bulkheads - Side Shell Plating Thickness Reduction

Dist to side = 34 ft = Distance from long'l bhd to side shell

0.2 * B = 20 ft

Extends over 0.5L midship? Yes = Long'l Bhd extends over midship 0.5L t_3.1_Reduction = 0.00 in

3.1.2 Transverse Framing

soffered = 1.33 ft PASS: Margin = 1.9 sreq'd = 2.5 ft

3.3 Sheer Strake

toffered, sheer strake = 0.50 in PASS tshell = 0.50 in trequired, deck stringer strake = 0.24 in (No deck stringer, used deck plate at edge)

3.5 Bottom Shell Plating

toffered = tbottom = 1.00 in PASS: Margin = 2.3 treq'd = 0.44 in = max (t_5.1, t 3.5.1, and t 3.5.2) t_3-2-7 = [ sk sqrt ( qh ) / 460 ] + 0.1 in see Below t_3-2-7 = 0.39 in Required t for cargo tank bulkheads

3.5.1 Longitudinal Framing

t 3.5.1 = 0.00054L + 0.007s + 0.07 in for L ≤ 405 feet t 3.5.1 = 0.41 in where: L = 314.88 ft = Minimum of rule length or 738 feet s = 24 in = frame spacing (max)

The thickness of the bottom shell plating within 0.4L amidships, as defined in 3-1-1/21, is not to be less than that obtained from the following equations:

= .02 in if Long'l Bhd is located < 0.2B from side of barge AND extends throughout the cargo space or over midship 0.5L

Where the side shell is transversely framed and the frame spacing adopted is greater than 760 mm (30 in.), calculations to show adequate provision against buckling are to be submitted.

In general, the thickness of the sheer strake is not to be less than the thickness of the side shell plating nor less than the required deck stringer strake thickness in the same section being considered.

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ABS Structural Scantlings Report

A-7 ABS Calculations: Plating - Shell

3.5.2 Transverse Framing

t 3.5.2 = 0.44 in = 0.03 in greater than obtained from the above equations t_5.1 = 0.00018L + 0.01s + 0.087 in for L > 250 feet t_5.1 = 0.38 in

5 Shell Plating at Ends

5.1 Minimum Shell Plating Thickness

ttopsides = 0.50 in PASS: Margin = 1 tbottom = 1.00 in PASS: Margin = 2.1 thead/sternlog = 0.5 in PASS: Margin = 1 treq'd = 0.00018L + 0.01s + 0.087 in for L > 250 feet treq'd = 0.384 in Within 0.1L (31.49 ft) of Ends treq'd, ABS MVR 3-2-2/3.11 = 0.480 in = required thicknesses + 25% for vessels without fenders where: L = 314.88 ft = Minimum of rule length or 738 feet s = 24 in = frame spacing (max)

5.3 Bottom Forward Plating

tbottom = 1.00 in PASS: Margin = 2 treq'd = 0.00066L + 0.01s + 0.04 in for L ≤ 360 feet treq'd = 0.49 in Within 0.1L (31.49 ft) of Ends where: L = 314.88 ft = Minimum of rule length or 738 feet s = 24 in = frame spacing (max)

5.5 Immersed Bow Plating N/A Bow is not ship-shape form

The minimum shell plating thickness for 0.1L at ends is to be obtained from the following equations.

Between the midship 0.4L and the end 0.1L, the thickness of the plating may be gradually tapered.

The thickness of the bottom forward plating, as defined in 3-1-1/33, is not to be less than that obtained from the following equations. However, it need not exceed 1 in.

. . . nor less than required by 3-2-2/5.1:

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

A-8 ABS Calculations: Plating - Shell

7 Shell Recesses

9 Bow and Stern Thruster Tunnels N/A No Thruster Tunnels

10 Skeg and other Appendages toffered = 0.63 PASS: Margin = 1.2 treq'd = 0.51 in = max (t_5.1 and t_3.5.1) + min (max (t_5.1 and t_3.5.1)*0.25, 0.25)

3-2-2/3 t_5.1 = 0.00018L + 0.01s + 0.087 in for L > 250 feet treq'd = 0.38 in t 3.5.1 = 0.00054L + 0.007s + 0.07 in for L ≤ 405 feet treq'd = 0.41 in t 3.5.1 = N/A Not Transversely Framed at Bottom

3-2-2/5 treq'd = 0.00018L + 0.01s + 0.087 in for L > 250 feet treq'd = 0.38 in Within 0.1L (31.49 ft) of Ends

11 Bilge Keels

Bilge keels, where fitted, are to be attached to the shell by a doubler. In general, both the bilge keel and the doubler are to be continuous. The connection of the bilge keel to the doubler and the doubler to the shell are to be by double continuous fillet welds.

Butt welds in the bilge keel and doubler are to be full penetration and are to be kept clear of master erection butts. In general, shell butts are to be flush in way of the doubler; doubler butts are to be flush in way of the bilge keel, and, in general, scallops and cutouts are not be used. Where desired, a drilled crack arresting hole at least 25 mm (1 in.) in diameter may be provided in the bilge keel butt weld as close

The ends of the bilge keel are to be suitably tapered and are to terminate on an internal stiffening member. The material tensile properties for bilge keels and doublers are to be as required for the bottom shell plating.

The thickness of the skeg plating is to be in accordance with 3-2-2/3 or 3-2-2/5 depending on its location, and 3-2-7/3.1 for deep tanks. The thickness of the shell plating in way of an appendage is to be increased by 25%. However, this increase need not exceed 6.5 mm (0.25 in.).

Recesses in shell plating to serve as ladders are to have well rounded corners and in general are to be staggered vertically with the recessed plating specially reinforced where forming pockets. The side shell longitudinals in way of shell recesses are to remain intact or the strength of the longitudinals is to be developed.

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A-9 ABS Calculations: Plating - Shell

12 Bilge Plating tbilge = 1.25 in PASS: Margin = 3.1 treq'd = max of 3-2-2/3 and 3-2-2/5 treq'd = 0.41 in

Side Rake t 3-2-2/3 = 0.00054L + 0.007s + 0.07 in for L ≤ 405 feet t 3-2-2/3 = 0.35 in

End Rake t 3-2-2/5 = 0.00066L + 0.01s + 0.04 in for L ≤ 360 feet t 3-2-2/5 = 0.41 in where: L = 314.88 ft = Minimum of rule length or 738 feet s = 16.00 in = frame spacing

Bilge Longitudinal spacing N/A No Bilge Strake tbilge = 1.25 in PASS: Margin = 1.3 tbottom = 1.00 in

13 Higher Strength Materials

13.1 General

In general, the bilge plate is to be longitudinally stiffened. The thickness of the bilge plate is to be not less than required in 3-2-2/3 and 3-2-2/5, adjusted for spacing of the bilge longitudinals or frames and the material factors.

In no case is the thickness of the bilge plate to be less than that of the adjacent bottom plating.

In general, applications of higher-strength materials for shell plating are to take into consideration the suitable extension of the higher-strength material above and below the bottom and deck, respectively (for longitudinal extent, see 3-2-1/11.1). Calculations to show adequate provision against buckling are to be submitted. Care is to be exercised against the adoption of reduced thicknesses of material that might be subjected to damage during normal operation. The thicknesses of bottom and side-shell plating, where constructed of higher-strength materials, are to be not less than required for purposes of longitudinal hull girder strength. The actual bottom/side plate thicknesses are also not to be less than those required in the previous paragraph, corrected using the Q factor, as specified below.

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A-10 ABS Calculations: Plating - Shell

13.3 Bottom Plating of Higher-Strength Material

toffered = 1.00 in PASS: Margin = 2.7 thts = (tms − C) Q + C thts = 0.36 in = thickness of higher-strength material tms = 0.44 in

C = 0.131 in = 0.3 tms but need not be greater than 0.17 in

Q = 0.757474 = High Strength Steel Factor

13.5 Side Plating of Higher-strength Material

toffered = 0.50 in PASS: Margin = 1.3 thts = [tms − C][(Q+2√Q)/3]+C thts = 0.39 in = thickness of higher-strength material tms = 0.44 in

C = 0.131 in = 0.3 tms but need not be greater than 0.17 in

Q = 0.757474 = High Strength Steel Factor

13.7 End Plating

= thickness, in mm (in.), of ordinary-strength steel, as required by 3-2-2/5

End plating thicknesses, including immersed bow plating and plating on the flat of bottom forward, where constructed of higher-strength materials, will be subject to special consideration.

Bottom shell plating, where constructed of higher-strength material, is to be not less in thickness than obtained from the following equation: thts = (tms − C) Q + C

= thickness, in mm (in.), of ordinary-strength steel, as required by 3-2-2/3.5

Side shell plating, where constructed of higher-strength material, is to be not less in thickness than obtained from the following equations: thts = [tms − C][(Q + 2√Q)/3] + C

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A-11 ABS Calculations: Plating - Shell

Chapter 2 Hull Structures and Arrangements

Section 3 Decks

1 Deck Plating

1.1 Deck Plating Thickness

1.1.1

N/A No transverse deck beams

1.1.2 toffered1 = 0.750 in PASS: Margin = 3.1 treq'd = 0.24 in = max of a) and b)

1.1.2(a) treq'd = 0.009s + 0.095 for s ≤ 30 in treq'd = 0.24 in

The strength deck plating is to be of the thickness necessary to obtain the required hull girder section modulus. The thickness outside the longitudinal line of the openings, or completely across the barge where there are no centerline openings, is not to be less than obtained from the equations in 3-2-3/1.1.1 or 3-2-3/1.1.2 below, except within steel deckhouses, where the plating may be 0.04 in less.

The requirements of equations 3-2-3/1.1.1(b) and 3-2-3/1.1.2(b) are to extend over 0.4L amidships, beyond which they may be gradually reduced in the manner permitted for strength deck area in 3-2-1/3.3.

The thickness requirements of 3-2-3/1.1.1(a) and 3-2-3/1.1.2(a) are to extend over the 0.8L amidships.

Thickness of strength decks with transverse beams in barges over 300 ft up to 600 ft is to be not less than 3-2-3/1.1.1(a) and 3-2-3/1.1.1(b) below:

Thickness of strength decks with longitudinal beams * OR * with transverse beams in barges 300 ft or less is to be not less than 3-2-3/1.1.2(a), below, and 3-2-3/1.1.1.

Thickness of forecastle decks in barges over 400 ft is to be not less than 3-2-3/1.1.2(a), below.

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A-12 ABS Calculations: Plating - Deck

1.1.2(b) treq'd = = s * (L + 160) / (26L + 28482) treq'd = 0.21 in where: L = 314.88 ft = Rule length s = 16 in = spacing of deck beams

1.1.3 toffered = N/A (No line of openings;

t_req'd referenced in 3-2-3/1.5) treq'd = 0.01s + 0.035 in for s ≤ 30 in treq'd = 0.20 in where: s = 16 in = spacing of deck beams

1.1.4 toffered = N/A (No enclosed cargo spaces;

t_req'd referenced in 3-2-3/1.5) treq'd = 0.00218s * sqrt(h) + 0.06 in but not less than 0.20 in treq'd = 0.32 in where: s = 16.00 in = frame spacing h = 55.56 ft = p / 45 ft p = 2500 lbf/ft2 = uniformly distr deck loading

1.1.5

N/A No Enclosed Platform Decks

Thickness of Enclosed Platform Decks not Intended for Cargo

Thickness of Platform Decks in Enclosed Cargo Spaces (referenced in 3-2-3 / 1.5)

Thickness of Exposed Strength Decks within Line of Openings and/or Forecastle Decks in Barges of 400 ft in Length or Less:

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A-13 ABS Calculations: Plating - Deck

1.3 Plating within Line of Openings

N/A No line of openings

1.5 Plating In Way of Deck Cargo

toffered = 0.75 in PASS: Margin = 2.3 treq'd = 0.32 in = max of 3-2-3/1.1.1, 1.1.2, 1.1.3, & 1.1.4

1.7 Deck Plating at Ends

Fwd/Aft 0.1L = toffered = 0.75 in PASS: Margin = 2.3 treq'd = 0.01 * s in Within 0.1L (31.49 ft) of Ends treq'd = 0.32 in where: L = 314.88 ft = Rule length s = 16 in = spacing of deck beams

0.05L = toffered = 0.75 in PASS: Margin = 2.7 treq'd = max (0.00036L + 0.0036s + 0.11, 0.01 * s) in treq'd = 0.28 in Within 0.05L (15.74 ft) of Ends

Within the longitudinal line of openings, the thickness of exposed strength deck plating is to be not less than obtained from the equation in 3-2-3/1.1.3 amidships. At the forward and after ends it is to be as required by 3-2-3/1.7. Within steel deckhouses, the plating may be of the thickness obtained from the equation in 3-2-3/1.1.4.

Where cargo is to be carried on deck, the deck thickness is not to be less than obtained from the appropriate equations in 3-2-3/1.1.1, 3-2-3/1.1.2 or 3-2-3/1.1.3, nor is the deck thickness to be less than is required for platform decks in enclosed cargo spaces per 3-2-3/1.1.4.

The thickness of deck plating forward or aft of 0.1L from the ends is not to be less than 0.01 in for each inch of frame spacing. In way of deck cargo, the requirements of 3-2-3/1.5 also apply.

Exposed freeboard deck plating forward of 0.05L from the forward perpendicular is also not to be less in thickness than given by the following equation:

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A-14 ABS Calculations: Plating - Deck where: L = 314.88 ft = Rule length s = 16 in = spacing of deck beams

3 Trunks

N/A No Trunks

5 Watertight Decks

N/A No Watertight flats, decks, or inner bottoms over tanks.

7 Superstructure Decks

N/A No Superstructure Decks

9 Mechanical Unloading

N/A

11 Reinforcement at Openings

13 Reinforcement at Superstructure or Deckhouse Ends

N/A No Superstructure

15 Retractable Tween Decks

N/A No Retractable Tween Decks

At corners of hatchways or other openings in decks, generous radii are to be provided. In general, the radii are not to be less than 1/8 of the breadth of the hatchway or other deck opening but the radii need not exceed 30 in. In general cargo, bulk cargo or container carrier barges, etc., with wide hatchway openings, the forwardmost and aftermost outboard comers of hatchway openings are to have insert plates of a thickness 25% greater than the adjacent required deck plating thickness. The material grade of these inserts is not to be less than class III as defined in 3-1-2/Table 2. Compensation may be required for all deck openings.

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A-15 ABS Calculations: Plating - Deck

17 Vehicle Loading toffered = 0.75 in PASS: Margin = 1.9 treq'd = Kn√(CW) treq'd = 0.40 in where:

n = 1.0 where l/s >= 2.0 and 0.85 where l/s= 1, interpolate b/w values

Highway Truck

Link RTC- 80130

Link RTC- 80130

Link TCC-

Link TCC-

Link TCC-

CAT V 620 CAT V 620

Tvse Long'l Long'l, Side Long'l, End Tvse, Side

Tvse Long'l

K 0.127 0.101 0.088 0.076 0.076 0.089 0.040 0.047 n 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000

C 1.10 1.10 1.10 1.10 1.10 1.10 1.10 1.10 = For Operating in Port

W (LT) 8.93 10.96 17.35 17.17 22.77 9.66 18.52 19.50

a (in) 26.80 23.60 37.37 64.00 64.00 36.00 30.50 32.12 b (in) 5.70 16 16 16 16 16 32.12 30.5 s (in) 16 16 16 16 16 16 16 16 = deck long'l spacing l (in) 64 64 64 64 64 64 64 64 = length of the pl panel l/s 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 = l / s ratio a/s 1.675 1.475 2.336 4.000 4.000 2.250 1.906 2.007 = a / s ratio b/s 0.356 1.000 1.000 1.000 1.000 1.000 2.007 1.906 = b / s ratio treq'd 0.40 0.35 0.39 0.33 0.38 0.29 0.18 0.22

K = [21.99 + 0.316(a/s)2 – 5.328(a/s) + 2.6(a/s)(b/s) – 0.895(b/s)2

– 7.624(b/s)]10−2

Where provision is to be made for the operation or stowage of vehicles having rubber tires, and after all other requirements are met, the thickness of deck plating is to be not less than obtained from the following equation:

= Wheel Load (per plate panel) = wheel imprint || to longer edge of pl panel

= wheel imprint to longer edge of pl panel

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A-16 ABS Calculations: Plating - Deck toffered = 0.75 in PASS: Margin = 1.7 treq'd = Kn√(CW) * 1.1 for strength deck treq'd = 0.44 in

N/A No platform deck

19 Decks of Higher-strength Material

19.1 Thickness

toffered = 0.75 in PASS: Margin = 2.1 thts = (tms − C) Q + C thts = 0.36 in = thickness of higher-strength material tms = 0.44 in = thickness of ordinary-strength steel as required by the Rules

C = 0.131 in = 0.3 tms but need not be greater than 0.17 in

In general, proposed applications of higher-strength material for decks are to be accompanied by submission of calculations in support of adequate strength against buckling. Care is to be exercised to avoid the adoption of reduced thicknesses of material such as might be subject to damage during normal operation. The thickness of deck plating, etc., where constructed of higher-strength material, is to be not less than required for longitudinal strength, nor it is to be less than obtained from the following equation:

Where the wheels are close together, special consideration will be given to the use of a combined imprint and load. Where the intended operation is such that only the larger dimension of the wheel imprint is perpendicular to the longer edge of the plate panel, b, above may be taken as the larger wheel imprint dimension, in which case, a is to be the lesser wheel imprint dimension.

For wheel loading, the strength deck plating thickness is not to be less than 10% greater than required by the above equation . . .

. . . and the platform deck plating thickness is to be not less than 90% of that required by the above equation.

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A-17 ABS Calculations: Plating - Deck

Q = 0.757474 = High Strength Steel Factor thts = (tms − C) Q + C thts = 0.22 in = thickness of higher-strength material tms = 0.21 in = thickness from 3-2-3/1.1.2(b)

C = 0.062 in = 0.3 tms but need not be greater than 0.17 in

Q = 1.06 = 0.92/√Q, but not less than 1.0

19.3 Vehicle Loading

toffered = 0.75 in PASS: Margin = 2.1 thts = tms √(M / Y) thts = 0.36 in = thickness of higher-strength material tms = 0.44 in = thickness of ordinary-strength steel as required by the Rules

M = 34000

Yield = 49,240 psi = Yield strength

U = 70,343 psi = Minimum tensile strength

0.72 U = 50,647 psi

Y = 49,240 PSI as defined in 3-2-6 / 5.1

Where decks or flats are constructed of higher strength material and provision is made for the operation or stowage of vehicles having rubber tires, the thickness of plating is to be not less than obtained from the following equations:

The thickness thts, is also to be determined from the above equation using the tms as obtained from 3-2-3/1.1.2(b) with a factor of 0.92 / √(Q) in lieu of Q. The factor 0.92 / √(Q) is not to be less than 1.0.

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A-18 ABS Calculations: Plating - Deck

Chapter 2 Hull Structures and Arrangements

Section 6 Watertight Bulkheads

1 General

3 Arrangements of Watertight Bulkheads

3.1 Collision Bulkhead

dactual = 25.25 ft aft FP OK dmin ≥ 0.05L ft from forward perpendicular where L < 656 feet dmin ≥ 15.74 ft dmax ≤ 0.05L + 12 ft from forward perpendicular where L < 400 feet dmax ≤ 27.74 ft where: L = 314.88 ft = Rule length

3.3 Other Watertight Bulkheads

Sactual = 32 ft OK

S = 0.153L + 12.5 ft where L < 400 feet

S = 60.7 ft = max distance b/w transv bhds where: L = 314.88 ft = Rule length

The collision bulkhead is to be located at a distance aft of the forward perpendicular (See 3-1-1/27), except as specially permitted, not more than given by the following:

All barges are to be fitted with a collision bulkhead extending intact to the freeboard deck in one plane.

The collision bulkhead is to be located at a distance aft of the forward perpendicular (See 3-1-1/27) not less than given by the following:

Watertight bulkheads are to be arranged to provide a reasonable standard of subdivision. The following is recommended to determine the maximum spacing between transverse watertight bulkheads in single bottom deck cargo barges, but is not required as a condition of classification:

All barges are to be provided with watertight bulkheads in accordance with this Section. In all cases, clearly show the location and extent of the bulkheads in the plans submitted.

Watertight bulkheads are those which have void/dry spaces on both sides and are not normally subject to hydrostatic loading.

The plating of non-watertight bulkheads should be in accordance with 3-2-6/5.1. The SM of non-watertight bulkhead stiffeners, stringers, and webs may be half of that obtained from the equations in 3-2-6/5.3 and 3-2-6/5.5

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A-19 ABS Calculations: Plating - Bhds

5 Construction of Watertight Bulkheads

5.1 Plating

WT Collision Bhd (Frame 4, Frame 58 similar) toffered = 0.375 in PASS: Margin = 1.56 treq'd = max (sk * √(qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.24 in s / 200 + 0.1 = 0.18 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 10.75 = aspect ratio of panel (long/short) l = 171.96 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 14.43 ft = distance from the lower edge of the plate to the freeboard deck at center c = 460 for collision bulkhead

Typical Transverse WT Bhd Mid (Frames 7, 13, 25, 37, 49, and 55):

toffered = 0.313 in PASS: Margin = 1.3 treq'd = max (sk * sqrt (qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.24 in s / 200 + 0.1 = 0.18 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 13.50 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft = distance from the lower edge of the plate to the freeboard deck at center c = 525 for other watertight bulkheads

Plating of watertight bulkheads is to be of the thickness obtained from the following equation, but not less than 0.24 in or s/200 + 0.10 in, whichever is greater.

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A-20 ABS Calculations: Plating - Bhds

Typical Transverse NT Bhd Mid (Frames 19, 31, and 43):

toffered = 0.313 in PASS: Margin = 1.3 treq'd = max (sk * sqrt (qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.24 in s / 200 + 0.1 = 0.18 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 13.50 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft = distance from the lower edge of the plate to the freeboard deck at center c = 525 for other watertight bulkheads

Transverse WT Bhd Wing (Frames 7, 13, 25, 37, 49, and 55) :

Transverse NT Bhd Wing (Frames 19, 31, and 43):

Transverse NT Wing Diaphragm Bhd (Frames 10, 16, 22, 28, 34, 40, 46, and 52) toffered = 0.375 in PASS: Margin = 1.56 treq'd = max (sk * sqrt (qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.24 in s / 200 + 0.1 = 0.2 in where: s = 20.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 10.80 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 20.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft = distance from the lower edge of the plate to the freeboard deck at center c = 525 for other watertight bulkheads

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A-21 ABS Calculations: Plating - Bhds

Transverse WT Bhd Wing Insert Plate (Frames 7, 13, 25, 37, 49, and 55) :

Transverse NT Wing Diaphragm Bhd Insert Plate (Frames 10, 16, 22, 28, 34, 40, 46, and 52) toffered = 0.75 in PASS: Margin = 1.06 treq'd = max (sk * sqrt (qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.71 in s / 200 + 0.1 = 0.59 in where: s = 97.47 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 2.95 = aspect ratio of panel (long/short) l = 97.47 in = length of panel (longer edge) b = 33.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft = distance from the lower edge of the plate to the freeboard deck at center c = 525 for other watertight bulkheads

Longitudinal NT Bhd, Long'l NT Diaphragm Bhd (Fore/Aft):

toffered = 0.375 in PASS: Margin = 1.56 treq'd = max (sk * sqrt (qh) / c + 0.06, 0.24, s/200 + 0.1) in treq'd = 0.24 in s / 200 + 0.1 = 0.18 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 13.50 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft = distance from the lower edge of the plate to the freeboard deck at center c = 525 for other watertight bulkheads

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A-22 ABS Calculations: Plating - Bhds

Chapter 2 Hull Structures and Arrangements

Section 7 Tank Bulkheads

1 General

3 Cargo Tank Bulkhead Scantlings

3.1 Plating (referenced in 3-2-2/1)

Typical Transverse Bhd toffered = N/A (No cargo tanks; t_req'd referenced in 3-2-2/1) treq'd = max (sk * √(qh) / 460 + 0.1, 0.25, s/150 + 0.1) in treq'd = 0.25 in s / 150 + 0.1 = 0.21 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 13.50 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 18.00 ft from topside base knuckle

(i.e., as defined in 3-2-2/1)

The length of the tanks and the positions of longitudinal bulkheads are to be such as to avoid excessive dynamic stresses in the hull structure. For subdivision and stability, see Section 3-6-1.

For Coating of water ballast spaces, see 3-1-2/19

Plating of cargo tank bulkheads is to be of the thickness obtained from the following equation, but not less than 0.25 in or s/150 + 0.10 in, whichever is greater.

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A-23 ABS Calculations: Plating - Tank Bhds

Longitudinal Bhd toffered = N/A (No cargo tanks; t_req'd referenced in 3-2-2/1) treq'd = 0.39 in = max of all required thicknesses treq'd = max (sk * sqrt (qh) / 460 + 0.1, 0.25, s/150 + 0.1) in treq'd = 0.25 in s / 150 + 0.1 = 0.21 in where: s = 16.00 in = stiffener spacing k = 1.00 = (3.075*sqrt (a) –2.077) / (a+0.272) where

(1 ≤ a ≤ 2) or 1.0 where a > 2 a = 13.50 = aspect ratio of panel (long/short) l = 216.00 in = length of panel (longer edge) b = 16.00 in = width of panel (shorter edge) q = 0.68 = 34,000 / Y

Y = 50,038 psi = yield strength or 72% of min tensile strength h = 21.00 ft as defined in 5-2-1/3 (exception in 3-2-7/5) toffered = 0.5 PASS: Margin = 1.29 treq'd = 0.000625L + 0.19 in treq'd = 0.39 in where: L = 314.88 ft = Rule length toffered = 0.4375 PASS: Margin = 1.28 treq'd = 0.000417L + 0.21 in treq'd = 0.34 in where: L = 314.88 ft = Rule length

5 Ballast and Deep Tank Bulkheads The scantlings of ballast and deep tanks in deck or hopper barges are to be determined by the preceding paragraphs, except that the design head h may be taken to a point located at two-thirds of the distance from the top of the tank to the top of the overflow, or 0.91 meters (3 feet), whichever is greater.

Where the compartments are filled through open manholes on the deck, the design head may be taken to the deck at side.

In addition to the above, the top strake of effective longitudinal bulkheads is not to be less in thickness than given by the following:

and the second top strake is not to be less in thickness than given by the following:

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A-24 ABS Calculations: Plating - Tank Bhds

Part 5 Hull Construction and Equipment

Chapter 2 Tank Barges

Section 1 Single Skin Tank Barges

3 Tank Head for Scantlings

Permanent Ballast Bin hreq'd = 27.0 min of h1 or h0 toffered = 0.3125 in ℎ1 = ρℎt + ℎa m (ft) not less than distance to top of hatch

4.3125 ft dist to top of hatch ℎ1 = 27.0 ft ℎ0 = 2/3 (ρℎs + 9 . 95Ps) m (Ps in bar) ℎ0 = N/A Overfill or high level N/A for gravel bin where: ρ = 4.80 PermaBallast specific gravity, SG 4.8 h t = 4.3125 ft h a = 6.30 ft = max(h a1 , h a2 ) h a1 = 6.30 ft =0.02L, 61m (200ft)<L≤122m (400ft)

L = 314.88 ft h a2 = N/A, no spill valve or rupture disk

Except for stanchions (see 5-2-1/Figures 1 through 3), the scantling head of structural members in tanks is to be obtained as follows:

The scantling head ℎ, in m (ft), is to be not less than ℎ1, nor less than ℎ0 where spill valves or rupture discs are fitted in lieu of high level alarms. ℎ1 is to be not less than the distance to the top of the hatch.

head from ctr of supported area or lwr edge of plating to deck@side or, where fitted, to the top of trunk deck at side for tanks w/in trunk

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

A-25 ABS Calculations: Plating - Tank Barges

Description SMact SMreq Section Modulus ABS SBR Rule ABS Equation f c h s l Q in3 in3 Pass/Fail (Forebody Shaded) ft ft ft

DECKS

Frames

1 Deck Beams (assume k = 1) 6x4x.375 L on 0.750-in PL 13.0 1.0 PASS - Margin is 13.3 5-1-1/3.1 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.945 8.80 1.33 5.33 0.76

2 Deck Beams IWO Cargo 6x4x.375 L on 0.750-in PL 13.0 6.2 PASS - Margin is 2.1 5-1-1/3.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.945 55.56 1.33 5.33 0.76

4 Forebody Deck Beams 6x4x.375 L on 0.750-in PL 13.0 1.0 PASS - Margin is 12.6 3-2-5/3.1.1 SM = Q ( 0.0041chsl 2 ) in3 0.0041 1.000 8.80 1.33 5.33 0.76

5 Forebody Deck Beams IWO Cargo 6x4x.375 L on 0.750-in PL 13.0 3.8 PASS - Margin is 3.4 3-2-5/3.1.2 and 5-1-1/3.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.585 55.56 1.33 5.33 0.76

6 Forebody Deck Beams at Corner 6x4x.375 L on 0.750-in PL 13.0 1.1 PASS - Margin is 11.4 3-2-5/3.1.1 SM = Q ( 0.0041chsl 2 ) in3 0.0041 1.000 8.80 1.33 5.60 0.76

Girders

1 Deck Girders 32 x 0.5 w/ 12 x 1 Flg T on 0.750-in PL 479.0 430.9 PASS - Margin is 1.11 5-1-1/7 & 3.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 55.56 16.00 16.00 0.76

Transverses

1 Deck Transverses 24 x 7 x 0.5 FP on 0.750-in PL 167.4 22.7 PASS - Margin is 7.4 5-1-1/7 & 3.1 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 8.80 5.33 16.00 0.76

2 Deck Transverses IWO Cargo 24 x 7 x 0.5 FP on 0.750-in PL 167.4 143.6 PASS - Margin is 1.2 5-1-1/7 & 3.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 55.56 5.33 16.00 0.76

2a Deck Transverse Quarters (Fr 1, 61, Corners)

16 x 3 x 0.5 FP on 0.750-in PL 58.6 31.6 PASS - Margin is 1.9 5-1-1/7 & 3.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 55.56 5.33 7.50 0.76

3 Forebody Deck Transverses 24 x 7 x 0.5 FP on 0.750-in PL 167.4 22.7 PASS - Margin is 7.4 3-2-5/3.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 8.80 5.33 16.00 0.76

4 Forebody Deck Transverses IWO Cargo 24 x 7 x 0.5 FP on 0.750-in PL 167.4 143.6 PASS - Margin is 1.2 3-2-5/3.3 and 5-1-1/7 and 3.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 55.56 5.33 16.00 0.76

BOTTOM

Frames

1 Bottom Frames 8x.625 FB on 1.000-in PL 14.2 2.8 PASS - Margin is 5 5-1-1/9 SM = Q ( 0.0041chsl 2 ) in3 0.0041 1.340 18.00 1.33 5.33 0.76

2 Bottom Ice Frames 10.5x1 FB on 1.250-in PL 37.0 5.0 PASS - Margin is 7.3 5-1-1/11 SM = Q ( 0.0041chsl 2 ) in3 0.0041 1.250 18.00 1.33 7.36 0.76

Girders

1 Bottom Girder 48 x 0.75 w/ 12 x 1 Flg T on 1.000-in PL 1062.1 837.7 PASS - Margin is 1.27 5-1-1/11 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.500 18.00 16.00 32.00 0.76

2 Ice Stringers 37 x 15 x 1 FP on 1.250-in PL 905.2 124.0 PASS - Margin is 7.3 5-1-1/9 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.750 18.00 8.12 16.00 0.76

Transverses

1 Bottom Web Frames 24 x 4 x 0.375 FP on 1.000-in PL 102.2 69.8 PASS - Margin is 1.5 5-1-1/11 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.500 18.00 5.33 16.00 0.76

BULKHEADS

Transverse Collision Bhd (Frame 4, Frame 58 sim.)

1 Vertical Stiffeners (mid) 5x3.5x.3125 L on 0.375-in PL 7.3 2.6 PASS - Margin is 2.8 3-2-6/5.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.600 8.05 1.33 10.13 0.76

2 Vertical Stiffeners (wing, inbd of 36' OCL) 5x3.5x.3125 L on 0.375-in PL 7.3 2.4 PASS - Margin is 3 3-2-6/5.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.600 7.98 1.33 9.939 0.76

3 Vertical Stiffeners (wing, outbd of 36' OCL) 4x3x.3125 L on 0.375-in PL 4.9 1.5 PASS - Margin is 3.4 3-2-6/5.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.600 6.95 1.67 7.368 0.76

4 Mid Insert Plt Header 8x4x.5 L on 0.375-in PL 23.0 11.2 PASS - Margin is 2.1 3-2-6/5.5 SM = Q ( 0.0025chsl 2 ) in3 0.0041 0.600 12.10 6.23 8 0.76

5 Wing Insert Plt Header 8x4x.5 L on 0.375-in PL 23.1 11.8 PASS - Margin is 2 3-2-6/5.5 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 12.10 6.23 8.12 0.76

Wing Vertical Web IWO Ice Stringer

(29'-4" OCL)

12 x 2.5 x 0.4375 FP on 0.375-in PL 29.8 9.6 PASS - Margin is 3.1 3-2-6/5.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 7.51 7.00 8.77 0.76

Wing Vertical Web IWO Ice Stringer

(36', OCL)

8x6x.5 L on 0.375-in PL 29.1 2.9 PASS - Margin is 10.1 3-2-6/5.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 8.05 7.00 4.64 0.76

Wing Vertical Web IWO Ice Stringer

(42'-8" OCL)

8 x 2.5 x 0.4375 FP on 0.375-in PL 15.4 2.7 PASS - Margin is 5.6 3-2-6/5.3 SM = Q ( 0.0025chsl 2 ) in3 0.0025 1.000 6.08 7.00 5.21 0.76

Item

NSF MCMURDO OFFLOAD INFRASTRUCTURE

ABS Structural Scantlings Report

A-26 ABS Calculations: Hull Shape Calculations

(Forebody Shaded) ft ft ft

Item

Typical Transverse WT Bhd (Frames 7, 13, 25, 37, 49, 55)

1 Vertical Stiffeners (mid) 6x3.5x.3125 L on 0.313-in PL 9.1 9.0 PASS - Margin is 1 3-2-6/5.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.600 11.20 1.33 18.00 0.76

2 Vertical Stiffeners (wing, inbd of 36' OCL) 5x3.5x.3125 L on 0.375-in PL 7.3 5.4 PASS - Margin is 1.3 3-2-6/5.3 SM = Q ( 0.0041chsl 2 ) in3 0.0041 0.600 9.92…