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DNV GL AS

RULES FOR CLASSIFICATION

ShipsEdition October 2015

Part 5 Ship types

Chapter 11 Non self-propelled units

FOREWORD

DNV GL rules for classification contain procedural and technical requirements related to obtainingand retaining a class certificate. The rules represent all requirements adopted by the Society asbasis for classification.

© DNV GL AS October 2015

Any comments may be sent by e-mail to [email protected]

If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of DNV GL, then DNV GL shallpay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to tentimes the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million.

In this provision "DNV GL" shall mean DNV GL AS, its direct and indirect owners as well as all its affiliates, subsidiaries, directors, officers,employees, agents and any other acting on behalf of DNV GL.

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Rules for classification: Ships — DNVGL-RU-SHIP-Pt5Ch11. Edition October 2015 Non self-propelled units

DNV GL AS

CHANGES – CURRENT

This is a new document.

The rules enter into force 1 January 2016.

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CONTENTS

Changes – current...................................................................................................... 3

Section 1 General....................................................................................................... 71 Introduction............................................................................................7

1.1 Introduction.........................................................................................71.2 Scope................................................................................................. 71.3 Application.......................................................................................... 7

2 Class notations....................................................................................... 72.1 Ship type notations.............................................................................. 72.2 Additional class notations......................................................................8

3 Definitions.............................................................................................. 93.1 Terms................................................................................................. 9

4 Documentation........................................................................................94.1 Documentation requirements................................................................. 9

5 Certification.......................................................................................... 115.1 Certification requirements....................................................................11

6 Testing..................................................................................................126.1 Testing during newbuilding for concrete barges...................................... 12

Section 2 Hull...........................................................................................................131 General arrangement design................................................................ 13

1.1 Subdivision arrangement..................................................................... 132 Compartment arrangement...................................................................13

2.1 Bottom structure................................................................................ 133 Structural design principles..................................................................13

3.1 Main deck..........................................................................................133.2 Bottom structure................................................................................ 13

4 Loads.................................................................................................... 134.1 Deck loading......................................................................................144.2 Blow-out pressure.............................................................................. 14

5 Hull girder strength.............................................................................. 145.1 Application.........................................................................................145.2 Special consideration.......................................................................... 155.3 Split hopper barges............................................................................ 16

6 Hull local scantling............................................................................... 186.1 Deck structure................................................................................... 18

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7 Buckling................................................................................................187.1 Stresses based on direct strength analysis............................................ 18

8 Fatigue strength................................................................................... 188.1 Application.........................................................................................18

9 Special requirements............................................................................ 199.1 Fore peak..........................................................................................199.2 Bottom slamming............................................................................... 199.3 Supporting structure of towing equipment............................................. 19

10 Pusher/barge or pusher/pontoon units..............................................2010.1 Subdivision arrangement................................................................... 2010.2 Hull girder strength.......................................................................... 2010.3 Hull local scantling............................................................................2010.4 Special requirements - Connecting elements........................................ 2010.5 Special requirements - Ice strengthening.............................................21

Section 3 Systems and equipment........................................................................... 221 Steering arrangement...........................................................................22

1.1 General requirements......................................................................... 222 Anchoring and mooring equipment.......................................................22

2.1 General requirements......................................................................... 222.2 Pusher/barge and pusher/pontoon units................................................ 23

3 Machinery, systems and electrical installations.................................... 233.1 General requirements......................................................................... 233.2 Pusher/barge and pusher/pontoon units................................................ 23

Section 4 Safety and lifesaving appliances...............................................................241 General safety requirements................................................................ 24

1.1 General............................................................................................. 242 Fire safety............................................................................................ 24

2.1 General requirements......................................................................... 243 Power supply........................................................................................24

3.1 General requirements......................................................................... 244 Radio communication........................................................................... 25

4.1 General requirements......................................................................... 255 Lifesaving appliances............................................................................25

5.1 General requirements......................................................................... 25

Section 5 Stability and openings and closing appliances.......................................... 271 Stability................................................................................................ 27

1.1 General requirements......................................................................... 27

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2 Openings and closing appliances.......................................................... 272.1 Drainage........................................................................................... 272.2 Hatches and deck openings................................................................. 282.3 Bow height........................................................................................ 28

Section 6 Concrete hull (TENTATIVE RULES)............................................................291 Materials............................................................................................... 29

1.1 General requirements......................................................................... 292 Design principles.................................................................................. 30

2.1 General requirements......................................................................... 303 Loads.................................................................................................... 31

3.1 Local loads........................................................................................ 313.2 Hull girder loads................................................................................ 32

4 Design resistance................................................................................. 334.1 General requirements......................................................................... 33

5 Survey and testing............................................................................... 345.1 Survey and testing during newbuilding of concrete barges....................... 345.2 Survey and testing after delivery of concrete barges...............................35

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SECTION 1 GENERALSymbolsFor symbols and definitions not defined in this section, refer to Pt.3 Ch.1 Sec.4.

1 Introduction

1.1 Introduction

1.1.1 These rules provide requirements for vessels intended to be operated as barges or pontoons.

1.2 Scope

1.2.1 These rules include requirements for strength for both steel and concrete hull, hatches and deckopenings, systems and equipment, stability and load line, and the relevant procedural requirementsapplicable to barges and pontoons.For barges intended to carry personnel, the scope also covers basic safety requirements. This includes firesafety, life saving appliances, power supply, and radio communication.

1.3 Application

1.3.1 The requirements in this chapter shall be regarded as supplementary to those given for the assignmentof class rules Pt.2, Pt.3 and Pt.4 applicable for the assignment of main class.

1.3.2 Vessels built in compliance with the relevant requirements in this Chapter may be given the mandatoryclass notation Barge or Pontoon.Vessels built in compliance with the relevant additional requirements in [2] of this Chapter may be given theclass notation Barge(Hopper).Vessels built in compliance with the relevant additional requirements in [6] of this Chapter may be given theclass notation Barge(Concrete).

2 Class notations

2.1 Ship type notations

2.1.1 Vessels built in compliance with the requirements as specified in Table 1 will be assigned the classnotations as follows:

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Table 1 Ship type notations

Classnotation

Description Qualifier Additional description Designrequirements, rulereference

<none> RU SHIP Pt.5 Ch.11Sec.1 to Sec.5

Concrete 2 Hull constructed from concrete RU SHIP Pt.5 Ch.11Sec.1 to Sec.6

Barge

Barges are vesselswithout sufficientmeans of self-propulsion for transit.Assistance from anothervessel during transit ortransportation service isassumed. 1

Hopper 3 Barge primarily designed for self-unloading where the port and starboardportions are hinged at the hopper endbulkheads to facilitate rotation aroundthe longitudinal axis when the bottomopens

RU SHIP Pt.5 Ch.11Sec.1 to Sec.5

Pontoon

Vessels without cargohold and no meansof self-propulsion fortransit.

<none>

Vessel specifically intended for carriageof cargo on deck only

RU SHIP Pt.5 Ch.11Sec.1 to Sec.5

1) Guidance note: For vessels with limited means of self-propulsion an upper limit for barges/pontoons may normallybe taken as machinery output giving a maximum speed less than V = 3 + L/50 knots, L not to be taken greater than200 m.

2) Barge made of concrete will be assigned the class notation: Barge(Concrete). The survey related class notationBIS is mandatory and requirements given in Pt.6 Ch.9 Sec.1 shall be complied with.

3) Hopper is an optional qualifier for barges built for dredging operations, i.e. Barge(Hopper).

2.2 Additional class notations

2.2.1 The following additional notations, as specified in Table 2, are typically applied to barges and pontoons:

Table 2 Additional class notations

Class notation Description Application

Strengthened (DK) Decks strengthened for heavy cargo All ships

R0, R1, R2, R3, R4, RE Service area notations All ships

2.2.2 For a full definition of all additional class notations, see Pt.1 Ch.2.

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3 Definitions

3.1 TermsTable 3 Definitions

Terms Definition

barges an unmanned or manned vessel, without sufficient means for self-propulsion, sailing in pushedor towed units with following characteristics:

— the ratios of the main dimensions may deviate from those usual for seagoing ships— the cargo holds are suitable for the carriage of dry or liquid cargo.

pontoons an unmanned or manned vessel, without self-propulsion with following characteristics:

— the ratios of the main dimensions deviate from those usual for seagoing ships— it is designed to carry deck load or working equipment, e.g. lifting equipment, rams etc. on

deck only and have no holds for the carriage of cargo.

hopper barge a self-unloading barge where the port and starboard portions are hinged at the hopper endbulkheads to facilitate rotation around the longitudinal axis when the bottom opens.

4 Documentation

4.1 Documentation requirements4.1.1 GeneralFor general requirements to documentation, including definition of the Info codes, see Pt.1 Ch.3 Sec.2.For a full definition of the documentation types, see Pt.1 Ch.3 Sec.3.

4.1.2 Barges and pontoonsDocumentation shall be submitted as required by Table 4.

Table 4 Documentation requirements

Object Documentation type Additional description Info

Towing arrangement Z030 – Arrangement plan Arrangement of towing line, fasteningarrangement and details. FI

Towing equipmentsupportingstructures

H050 - Structural drawing Including towing force design loads andwinch load footprint. AP

AP = For approval; FI = For information

ACO = As carried out; L = Local handling; R = On request; TA = Covered by type approval; VS = Vessel specific

4.1.3 Additional documentationFor barges and pontoons, carrying 36 persons or more the following additional following documentation shallbe submitted as required by Table 5.

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Table 5 Documentation requirements - Class notation Barge or Pontoon carrying 36 persons ormore


G040 – Fire control plan APSafety general

G050 – Safety control plan AP

G060 – Structural fire protectiondrawing APStructural fire

protectionarrangements G061 – Penetration drawings AP

I200 – Control and monitoringsystem documentation APFire detection and

alarm systemZ030 – Arrangement plan AP

S010 – Piping diagram (PD) AP

S030 – Capacity analysis APFire water system

Z030 – Arrangement plan AP

Fixed fire-extinguishingsystems

G200 – Fixed fire extinguishingsystem documentation AP

Escape routes G120 – Escape route drawing AP

S012 - Ducting diagram (DD) APVentilation systems

S014 - Duct routing sketch AP

Life-savingappliances

G160 – Life-saving arrangementplan AP



For class notation qualifier Concrete, additional documentation shall be submitted as required by Table 6.

Table 6 Documentation requirements - For class notation qualifier Concrete


H010 – Structural design brief

Including:

— Overall design safety— Functional requirements— Material data— Design phases.

FI

Hull structure

H020 – Design load plan

Including:

— Self-weight distribution— Accidental loads.

FI

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H050 – Structural drawing

Including:

— Reinforcement in structural members— Reinforcement details— Position and density of pre-stressing

arrangement— Pre-stressing anchorage details.

AP

H080 – Strength analysis

Including:

— Combination of local and global loads fordifferent limit states

— Calculationof the utilisation of the structuralelements in the different limit states.

FI

Z164 - Inspection manual For in-service inspection, based on design andconstruction considerations. AP

Q010 – Quality manual Documenting valid EN ISO 9001 certificate orequivalent. FI

Z260 – Report Deviation reports and their closure documentation. AP

Structuralfabrication H130 – Fabrication specification

Including:

— Qualification testing of the concrete— Construction procedures— Formwork— Concreting— Procedure for taking control specimens and

testing of these— Procedure for curing of the concrete.

FI



5 Certification

5.1 Certification requirements5.1.1 GeneralFor a definition of the certificate types, see Pt.1 Ch.3 Sec.5.

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5.1.2 BargesProducts for Barge(Concrete) shall be certified as required by Table 7.

Table 7 Certification requirements

Object Certificatetype

Issued by Certification standard* Additional description

Concrete materials MC Society

Anchorage devices andmechanical splices

PC Society See DNVGL-OS-C502 Sec.4 G200

* Unless otherwise specified the certification standard is the rules

6 Testing

6.1 Testing during newbuilding for concrete barges

6.1.1 Testing requirements for class notation Barge(Concrete) is given in Sec.6 [5].

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SECTION 2 HULLSymbolsFor symbols and definitions not defined in this section, refer to Pt.3 Ch.1 Sec.4.

1 General arrangement design

1.1 Subdivision arrangement1.1.1 Watertight bulkhead arrangementA watertight bulkhead shall be fitted at both ends of the hold area. In the remaining part of the hull,watertight bulkheads shall be fitted as required for the purpose of watertight subdivision and for transversestrength.For barges and pontoons with length LLL ≥ 100 m and with discharging arrangements in the bottom, theregions having such bottom openings shall be bounded by watertight transverse bulkheads from side to side.

1.1.2 Collision bulkheadBarges and pontoons shall have a collision bulkhead and an after end bulkhead.For barges and pontoons withLLL ≥ 100 m, the position of the collision bulkhead shall be determined according to Pt.3 Ch.2 Sec.2 [4].

2 Compartment arrangement

2.1 Bottom structure

2.1.1 The bottom structure may be built as single or double bottom. In case the barge is arranged with adouble bottom refer to requirements given in Pt.3 Ch.2 Sec.3 [2] and Pt.3 Ch.3 Sec.5 [6].The height of a double bottom shall give good access to all internal parts. The height shall not be less than650 mm.

3 Structural design principles

3.1 Main deck

3.1.1 If the deck will be subjected to heavy point loads, plans shall be submitted showing the arrangementand position of loads as well as their magnitude.It shall be specified if all loading points will be subject to loads simultaneously, or if there will be somealternative groupings of the loads. For reduction of dynamic loads, see Table 1 in [5.2.1].Heavy point loads should preferably be supported directly by bulkheads.Decks subject to wheel loads shall have scantlings complying with requirements given in Pt.3 Ch.10 Sec.5.Dry cargo barges where the cargo holds and the main deck are supported by cantilevers are to comply withrequirements given in Ch.1 Sec.5.

3.2 Bottom structureThe bottom structure shall be considered as a grillage system being supported by ship sides and/orbulkheads.

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4 Loads

4.1 Deck loadingThe uniform deck loading (UDL) for cargo deck shall not be taken less than 0.7 t/m2.

4.2 Blow-out pressureWhere tanks are intended to be emptied by compressed air, the maximum blowing-out pressure shall replacePPV in the formulae for determining the pressures Pls in Pt.3 Ch.4 Sec.6 [1.2].

Guidance note:The maximum blowing-out pressure applied in the design and used as approval basis will be stated in the appendix to classificationcertificate.

---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e---

5 Hull girder strength

5.1 Application

5.1.1 Scantlings of the longitudinal hull structure shall be determined on the basis given in Pt.3 Ch.5 Sec.1.The wave parameter, Cw, need not be taken greater than D/1.4 when calculating the vertical wave bendingmoment Mwv, as defined Pt.3 Ch.4 Sec.4 [3.1]. No reduction is allowed for the vertical wave shear force asdefined in Pt.3 Ch.4 Sec.4 [3.2].For barges and pontoons with restricted service area, see [5.2.1].

5.1.2 The minimum midship net section modulus shall not be less than the value obtained from the followingformula:

CW0 as given in Figure 1.

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00

11

22

33

44

55

66

77

88

99

1010

1111

Figure 1 Wave coefficient

5.1.3 For ordinary barge construction the section modulus outside 0.4 L amidship will normally besatisfactory. In other cases it may be necessary to consider the section modulus in more detail along theship length. In such cases the distribution of bending moments may be taken as outlined in Pt.3 Ch.4 Sec.4[2.2]. The bending stresses at ends shall not exceed 95/k N/mm2 and 75/k N/mm2 for ordinary seagoing andspecial harbour conditions (see [5.2.2]), respectively.

5.1.4 Split hopper bargesSplit hopper barges longitudinal hull girder strength calculations shall be carried out for the unloadingcondition according to [5.3].

5.2 Special consideration5.2.1 Restricted serviceFor barges and pontoons with restricted service Cw and Cwo may be reduced as given in Table 1.

Table 1 Values of Cw and Cwo

Class notation Reduction

Cw Cwo

R0 none none

R1 none none

R2 10% 5%

R3 25% 13%

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Class notation Reduction

R4 40% 20%

RE 50% 25%

1) Note: Regarding R0 to RE, see Pt.1 Ch.2 Sec.5

5.2.2 Special harbour conditionsFor special harbour conditions, e.g. transient states when moving heavy structures on board from end ofbarge, or when the wave heights are considered to be negligible, the wave bending moment may be takenzero when calculating Z in Pt.3 Ch.5 Sec.1 [1.3.1]. Correspondingly the most unfavourable still water bendingmoment, Msw, shall be used in [5.1.1]. If Msw should occur outside 0.4 L amidships the actual section shall beconsidered.

5.3 Split hopper barges

5.3.1 For unloading condition of split hopper barges, the following stresses, in N/mm2, in the split hopperarea for still water condition and HSM and FSM load cases shall be considered as follows:

M’y-sw M’z-sw = still water bending moments, in kNm, related to the inertia axis y'-y' and z'-z'

respectively, as shown in Figure 2M’z-dyn = bending moments related to external hydrodynamic pressure for HSM and FSM load

cases, in kNm, related to the inertia axis y'-y' and z'-z' respectively as shown in Figure2, to be taken as:

I’y-n50 I’z-n50 = moments of inertia of the cross section shown in Figure 2 related to the respective

inertia axis, in m4

ey', ez' = distances of the position being considered to the inertia axis y'-y' and z'-z' respectively,in m

Pw = external hydrodynamic pressure, in kN/m2, for TSC, for HSM and FSM load cases asdefined in Pt.3 Ch.4 Sec.5 [1.3]

ℓh = spacing, in m, between hingesh = cargo height, in m, as shown in Figure 2ρ = design cargo density, in t/m3, not to be taken less than 1.2PL = static design cargo pressure, in kN/m2, shall be taken as:

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The stresses in the split hopper area shall be determined for the most unfavourable distribution of cargo andconsumables.

PW

PW

TSC

h

y'

y'

z'

z'

PL

Figure 2 Static loads on a self-unloading barge, loaded.

5.3.2 The hull girder stresses combined with stresses in the split hopper area, in N/mm2, shall satisfy thefollowing criteria:

where:

σhg-sw = hull girder stress, in N/mm2, due to vertical still water bending moment as defined in Pt.3 Ch.5Sec.1 [5].

σhg-dyn = hull girder stress, in N/mm2, for HSM and FSM load cases as defined in Pt.3 Ch.5 Sec.1 [5].

5.3.3 Stresses in the bearing seating and all other members of the hinge shall satisfy the following criteria:

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where:

σb = bending stress, in N/mm2.τ = shear stress, in N/mm2.

6 Hull local scantling

6.1 Deck structureIf the deck girders constitute a grillage system, direct strength calculations according to Pt.3 Ch.6 Sec.6 shallbe made applying the design load sets specified in Pt.3 Ch.6 Sec.2 (or other specified design load sets givenby the designer), to verify that the stress criteria given in Pt.3 Ch.6 Sec.6 [2.2] are complied with.

7 Buckling

7.1 Stresses based on direct strength analysisThe normal stresses and shear stress taken from direct strength assessment to be applied for bucklingcapacity calculation of plate panels (ref. Pt.3 Ch.8) shall be corrected as given in DNVGL-CG-0128Buckling,Sec.3.

8 Fatigue strength

8.1 ApplicationFatigue strength calculations shall be performed for barges and pontoons being operated as an offshoreinstallation, e.g. fixed to a specific oil field for longer periods with no possibilities for survey and intended tooperate in harsh weather conditions. For such units, verification of fatigue strength is required when theirlength exceeds 150 m.If applicable, all longitudinal strength members on external shell and deck shall be verified for compliancewith the prescriptive fatigue strength requirements in Pt.3 Ch.9.

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9 Special requirements

9.1 Fore peakBarges and pontoons other than those assigned the notation R3,R4 or RE, shall be checked for bow impactaccording to Pt.3 Ch.10 Sec.1. If necessary, both ends shall be reinforced, see also [1.1.1].

9.2 Bottom slammingThe bottom in barges and pontoons with L > 100 m shall be strengthened against slamming, see Pt.3 Ch.10Sec.2. In the formula for CSL-et and CSL-ft the ballast draught TF-e and TF-f may be substituted by full draughtT.

9.3 Supporting structure of towing equipmentTowing hooks, winches and brackets with their supporting structure shall be capable of withstanding thebreaking load Pb of the towline.

The breaking load Pb shall not be taken less than the towline minimum breaking strength given in Table 1 inPt.3 Ch.11 Sec.1 [3].

Acceptable stress levels in the supporting structure resulting from bending moments and shearing forcescalculated for the load Pb are:

where:

σb = bending stress, in N/mm2

τ = shear stress, in N/mm2

σvm = combined stress, in N/mm2

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10 Pusher/barge or pusher/pontoon units

10.1 Subdivision arrangement10.1.1 Collision bulkheadThe barge/pontoon is at least to have a collision bulkhead between 0.05 L and 0.08 L from F.P. and an afterpeak bulkhead at a suitable distance forward of the connection area.

10.2 Hull girder strengthThe longitudinal strength shall comply with the requirements given in Pt.3 Ch.5. For the combined pusher/barge unit or pusher/pontoon unit of Type I the longitudinal strength of the barge/pontoon shall be based ona length L as given in Pt.3 Ch.1 Sec.4 [3]measured between the bow of the barge/pontoon and the stern ofthe pusher.

10.3 Hull local scantling

10.3.1 Structural members are in general to comply with the rule requirements for hull structures inPt.3based on the rule length of the combined unit.

10.3.2 Scantlings of the after body of the barge/pontoon are in no case to be less than required for thebarge/pontoon in unconnected condition.

10.4 Special requirements - Connecting elements

10.4.1 The pusher and the aft part of the barge/pontoon shall be so designed as to allow the pusher tointeract with the stern area of the barge/pontoon. The mutual forces between the two structures shallbe transferred by a system of contact surfaces. The connection of Type I shall be secured by at least onemechanical locking device. For Type II a flexible connection shall be provided.

10.4.2 The connection forces shall be based on the most severe load conditions to be expected inservice. Wave-induced loads shall be determined according to accepted theories, model tests or full scalemeasurements.The loads shall be referred to extreme wave conditions, which should be based upon wave statistics for theexpected route or service area, in case of restricted service. For unlimited world wide service North Atlanticwave statistics shall be used. The resulting loads shall be given as long term values corresponding to 108

wave encounters (most probable largest loads at a probability of exceedance equal to 10-8).Realistic conditions with respect to speed and navigation in heavy weather shall be considered, also takinginto account the general assumption of competent handling.

10.4.3 Direct calculations shall be made in order to evaluate the stresses in all relevant strength members ofthe connection between barge/pontoon and pusher. Shearing forces and or longitudinal bending moments inthe sections in question are found from direct calculations for barge/pontoon and pusher in still water and inwaves. Pre-loading from locking devices is also to be taken into account.The stresses in the connection, in N/mm2, for the static plus dynamic (S+D) design load scenario shall notexceed the following permissible values:

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For forged and cast steel parts, k, shall be taken as:

10.4.4 All relevant strength members shall have effective continuity, and details which may cause stressconcentration shall have gradual transitions.

10.4.5 Deflections of the structural parts in the connection structure and the necessary pre-loading shall beconsidered in order to avoid hammering when the most unfavourable reaction forces occur. Calculations ofthese deflections shall be submitted.

10.4.6 Locking devices and or other connection equipment are subject to approval. If based on hydraulicoperation the connecting system shall be mechanically lockable in closed position with remote indication onthe bridge.

10.5 Special requirements - Ice strengthening

10.5.1 Pusher/barge units or pusher/pontoon units with Type I connection system may be given an ice classnotation provided relevant requirements given in Pt.6 Ch.6 regarding machinery and hull strengthening arecomplied with.

10.5.2 The requirements to machinery (in the pusher) and hull strengthening shall be based on adisplacement which is the sum of the displacements of barge/pontoon and pusher.

10.5.3 The hull strengthening of the exposed part of the pusher shall comply with the requirements for theaft end of the combined pusher/barge unit or pusher/pontoon unit.

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SECTION 3 SYSTEMS AND EQUIPMENT

1 Steering arrangement

1.1 General requirements

1.1.1 If rudder is installed, the steering arrangement shall comply with the requirements given in Pt.3 Ch.14Sec.1 as far as these rules are found to be relevant for barges and pontoons.When calculating the rudder force, the speed shall not be taken less than 8 knots.

2 Anchoring and mooring equipment


2.1.1 For manned barges and pontoons with restricted service the equipment specified in Pt.3 Ch.11 Sec.1Table 1 may be reduced in accordance with Pt.3 Ch.11 Sec.1 Table 3. No reductions are given for classnotations R0 and R1.

2.1.2 For manned barges and pontoons with equipment number EN less than 205 the anchor and chainequipment specified in Pt.3 Ch.11 Sec.1 Table 1 may be reduced, on application from the owners, based upona special consideration of the intended service area of the vessel. The reduction shall not be more than givenfor the service notation R4 in Pt.3 Ch.11 Sec.1 Table 3. In such cases a minus sign will be given in bracketsafter the equipment letter for the vessel in the “Register of vessels classed with the Society”, e.g. f(–).

2.1.3 Unmanned barges and pontoons may be accepted with only 2 mooring lines with length as required byPt.3 Ch.11 Sec.1 Table 1, i.e. without anchoring equipment installed.

2.1.4 The equipment number EN for determining the equipment according to Pt.3 Ch.11 Sec.1 Table 1 shallbe determined for pontoons carrying lifting equipment, rams etc. by the following formula:

EN = Δ2/3 + B · fb + fw

Δ = displacement of the pontoon, in t, at maximum anticipated draught.fb = distance, in m, between pontoon deck and waterline.fw = wind area of the erections on the pontoon deck, in m2, which are exposed to the wind from forward,

including houses and cranes in upright position.

2.1.5 In special cases, upon owner’s request, for manned pontoons the number of anchors may be reducedto one and the length of the chain cable to 50% of the length required by Pt.3 Ch.11 Sec.1 Table 1. In suchcases a B will be given in brackets after the equipment letter for the vessel, e.g. F(B).

2.1.6 If necessary for a special purpose, for pontoons mentioned under [2.1.5], the anchor mass maybe further reduced by up to 20%. Upon owner’s request the anchor equipment may be dispensed with.The notation “Without anchor equipment” will be entered into the appendix to the class certificate and“Register of vessel classed with the Society” in such cases.Additionally the notation “For sea voyages anchor equipment shall be available” will be entered into theappendix to the class certificate.

2.1.7 If a steel wire rope shall be provided instead of a stud link chain cable on manned barges andpontoons, the requirements given in Pt.3 Ch.11 Sec.1 [5] shall be complied with.

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2.1.8 For a barge rigidly connected to a push-tug the equipment number shall be calculated for thecombination regarded as one unit.

2.1.9 Anchor equipment fitted in addition to that required herein, e.g. for positioning purposes, is not part ofClassification.

2.2 Pusher/barge and pusher/pontoon unitsThe pusher/barge or the pusher/pontoon unit shall have equipment corresponding to an equipment numberwhich shall be calculated for the combined pusher/barge or pusher/pontoon unit according to Pt.3 Ch.11Sec.1 [3].

3 Machinery, systems and electrical installations


3.1.1 If the barge or pontoon is arranged with machinery and electrical installations, relevant requirementsgiven in Pt.4 shall be complied with.

3.2 Pusher/barge and pusher/pontoon units3.2.1 Machinery, bilge system, fire extinguishing plantMachinery, pumps, piping systems, fitting, materials, bilge system and fire extinguishing plant shall complywith Pt.4, as relevant for barges/pontoons.

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SECTION 4 SAFETY AND LIFESAVING APPLIANCES

1 General safety requirements

1.1 General

1.1.1 For barges and pontoons designed to carry 36 persons or more the safety requirements in this sectionshall apply.

1.1.2 The yard or builder shall submit evidence of these topics being accepted by the respectiveAdministration, in which the same will be also be acceptable to the Society.

1.1.3 For manned barges and pontoons with less than 36 persons, the requirements herein will be reviewedon a case by case basis.

2 Fire safety


2.1.1 In absence of specific safety requirements from the respective flag administration, the barge shallcomply with the cargo ship fire safety requirements of Ch.II-2 of SOLAS 1974 as amended.

3 Power supply


3.1.1 For barges and pontoons with a power generation plant, at least two main generator sets shall beprovided. The capacity shall be sufficient to maintain the barge in normal operational conditions with any onemain generator out of operation.

3.1.2 A self-contain emergency source of power shall be provided. The emergency source of power and itsassociated equipment shall be located on or above the freeboard deck, and independent of the main electricalpower required by [3.1.1].

3.1.3 The requirements for a separate emergency source of power may be omitted for installations with twoindependent engine rooms when compliant with Pt.4 Ch.8 Sec.2 [3.1.4].

3.1.4 In case of failure in the main source of electrical power, the emergency source of power shall beautomatically connected to the emergency switchboard unless a transitional source of power is provided.The emergency source of power shall be capable of supplying simultaneously the services listed for at least18 hours

— emergency lighting for machinery spaces, control stations, alleyways, stairways, exits and elevators— emergency lighting for embarkation stations on decks and over sides— emergency lighting for stowage position(s) for firemen’s outfits— emergency lighting for helicopter landing decks— navigation and special purpose lights and warning systems including helicopter landing lights— general alarm and communications systems— fire detection and alarm systems

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— fire extinguishing systems.

3.1.5 The transitional source of power, if required, shall be capable of supplying the services listed for atleast 30 minutes:

— emergency lighting— general alarm and communications systems— fire detection and alarm systems.

3.1.6 The electrical installation shall comply with relevant requirements given in Pt.4 Ch.8.

4 Radio communication


4.1.1 In absence of specific radio communication requirements from the respective Flag Administration, thebarge shall be provided with a radio-telephone station complying with the provision of Chapter IV of SOLAS1974 as amended and at least one emergency position-indicating radio beacon (EPIRB).

4.1.2 The radio station shall be subject to survey by the administration which issue the licence or itsauthorised representative before the radio station is put into service.

4.1.3 The radio station shall be surveyed once every 12 months, carried out by an officer of theAdministration or its authorised representative, or by a qualified radio service engineer from a local radio firmapproved by the Society.

5 Lifesaving appliances


5.1.1 In absence of specific lifesaving appliances requirements from the respective flag administration, thebarge is to comply with the requirements given in Part A and Section I of Part B of Ch.III of SOLAS 1974,as amended, and with the applicable provisions of the International Life-Saving Appliance (LSA) Code.Furthermore, under the same condition the articles [5.1.2] to [5.1.7] will also apply.

5.1.2 The barge shall carry one or more lifeboats complying with the requirement of section [4.6], [4.7],[4.8] and [4.9] of the LSA Code of such aggregate capacity on each side of the ship as will accommodate atleast 50% of all persons onboard.

5.1.3 In addition, inflatable or rigid liferafts complying with the requirement of section [4.2] and [4.3] of theLSA Code, of such aggregate so that there will be survival craft on each side of the barge to accommodate allpersons onboard.

5.1.4 In lieu of the requirement in [5.1.2] and [5.1.3], barges and pontoons of less than 85 m in length orbarges and pontoons with appropriate damage stability as per SOLAS SPS Code, may carry on each side ofthe barge one or more life rafts complying with the requirement of section [4.2] and [4.3] of the LSA Code ofsuch aggregate as will accommodate all persons onboard.

5.1.5 The barge shall carry at least one rescue boat complying with the requirement of section 5 of the LSACode.

5.1.6 Personal life-saving appliances shall comply with requirements given in SOLAS Reg.III/32.

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5.1.7 Survival craft embarkation and launching arrangement shall comply with requirements given in SOLASReg.III/33.

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SECTION 5 STABILITY AND OPENINGS AND CLOSING APPLIANCES

1 Stability


1.1.1 Barges or pontoons with a length LLL of 24 m and above shall comply with the intact stabilityrequirements according to Pt.3 Ch.15.

1.1.2 The alternative stability criteria as given in 2008 IS Code Part B Ch.2.2 may be applied for vessels withclass notations Barge, Pontoon or Barge(Concrete) for which the application requirements of 2008 ISCode Part B Ch.2.2.1 are met.

1.1.3 Vessels with class notation Barge(Concrete) shall be capable of surviving a minor hull damage thatresults in flooding of any one compartment bounded by the shell. The minor damage should be assumed tooccur anywhere in the length of the barge, but not on a watertight bulkhead or deck. The barge's survivalcapabilities after the specified damage shall be in accordance with the damage stability criteria of IMOresolution MSC.235(82) chapter 3.3.Other recognized international damage stability standards may however be accepted as an alternative to IMOresolution MSC.235(82) subject to agreement with the Society.

2 Openings and closing appliances

2.1 Drainage

2.1.1 Barges or pontoons are normally to be provided with means for drainage of cargo holds, enginerooms and watertight compartments and tanks which give major contribution to the vessel's buoyancy andfloatability.

2.1.2 As far as applicable and with the exemptions specified in the following, the rules and principles fordrainage of ship with propulsion machinery shall be complied with.

2.1.3 Manned barges and pontoons shall be provided with a permanently installed bilge system with powerbilge pumps. The bilge system shall have suctions in rooms mentioned in [2.1.1].An additional emergency bilge suction shall be provided in engine rooms.Dry compartments in fore- and after peaks may be drained by effective hand pumps. Rooms situated on deckmay be drained directly overboard.

2.1.4 Manned barges and pontoons for unlimited service shall be equipped with two permanently installedbilge pumps.Manned barges and pontoons with restricted service may have one bilge pump.Ballast pumps may be used as bilge pumps. Where only one permanently installed bilge pump is installed,this pump shall not serve as fire pump.

2.1.5 Ballast systems shall comply with the requirements for ballast systems in ships. However, one ballastpump may be accepted.Alternative methods for emptying ballast tanks, e.g. by means of compressed air and bottom valves, may beaccepted upon consideration in each case.

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2.1.6 Unmanned barges and pontoons shall be provided with drainage facilities for compartments roomsmentioned in [2.1.1].For cargo holds the facilities shall be so arranged that drainage can be performed in loaded conditions, forinstance by arranging ducts for portable pumps to bilge wells or piping from the connection point of the bilgepump to the bilge wells.Other compartments which shall be drained by portable equipment shall be provided with suitable accessopenings for such equipment.Any engine room or pump room shall have bilge suctions to available pumps.

2.1.7 Unmanned barges and pontoons may have portable bilge pumping equipment only, arranged with theirown power supply.For barges and pontoons for unlimited service such equipment shall be permanently installed.For barges and pontoons for restricted service the rules are based on the assumption that suitable bilgepumping equipment is available on board the barge or on board the towing / pushing vessel. This assumptionwill be included in the appendix to the class certificate to be issued for the barge.

2.2 Hatches and deck openings

2.2.1 Deck openings in barges and pontoons shall normally have hatch coamings and covers as given in Pt.3Ch.12. Minimum design pressure for hatch covers in dry cargo barges is 3.5 kN/m2.

2.2.2 The closing arrangement of deck openings for barges and pontoons with restricted service and highfreeboard will be specially considered.

2.3 Bow height

2.3.1 The requirement for minimum bow height given in Pt.3 Ch.2 Sec.2 [2] may be dispensed with.Guidance note:For manned barges and pontoons the requirements for bow height should be clarified with the respective flag administration.


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SECTION 6 CONCRETE HULL (TENTATIVE RULES)

1 Materials


1.1.1 A barge may be constructed using the following materials: steel reinforcement, FRP reinforcing rods,LWA concrete, NW concrete, structural grout, or fibre reinforced grout.

1.1.2 Concrete is in this standard used as a common reference to NW concrete, LWA concrete, structuralgrout, fibre reinforced structural grout and fibre reinforced structural concrete if the above specified materialsare not included specifically.

1.1.3 Definitions (for further definitions, see DNVGL-OS-C502 Sec.4):

— NW denotes normal weight concrete— LWA concrete denotes lightweight aggregate concrete— fibre reinforced concrete is concrete mixed with either steel or FRP fibres— fibre reinforced structural grout is grout mixed with either steel or FRP fibre— FRP fibres are fibres cut from fibre reinforced polymers.

1.1.4 The material to be used in a concrete barge shall be in accordance with the requirements specified inDNVGL-OS-C502 Sec.4.

1.1.5 Testing of concrete, grout, steel, FRP, additions, admixtures and constituent materials shall all be inaccordance with the requirements of DNVGL-OS-C502 Sec.4 M.

1.1.6 The material properties of concrete (with and without fibres) shall be in accordance with therequirement DNVGL-OS-C502 Sec.4 C and D.

1.1.7 The material properties of grout (with and without fibres) shall be in accordance with the requirementDNVGL-OS-C502 Sec.4 C, E and F.

1.1.8 For concrete, fibre reinforced concrete, structural grout and fibre and reinforced structural grout; the28 days characteristic compressive strength, fck , is defined as the lower 5th percentile found from statisticalanalysis of tests on cylindrical specimens with diameter 150 mm and height 300 mm.

1.1.9 For NW concrete, LWA concrete and fibre reinforced concrete; normalized compressive and tensilestrength are required in detailed designed of structural members. Normalized values are given in DNVGL-OS-C502 Sec.4.

1.1.10 For LWA concrete, grout, fibre reinforced concrete and fibre reinforce grout; MC material certificatesare required, documenting specific product properties. For further details, see DNVGL-OS-C502 Sec.4.

1.1.11 For FRP reinforcement MC material certificates are required, documenting specific product properties.For further details, see DNVGL-OS-C502 Sec.4.

1.1.12 MC material certificates for NW Concrete, reinforcement and tendons as required by DNVGL-OS-C502Sec.4 shall be submitted.

1.1.13 For fatigue properties of concrete, LWA concrete, fibre reinforced concrete, grout and fibre reinforcedgrout; references are made to DNVGL-OS-C502 Sec.6 M200. Parameters defining the fatigue parametersshall be defined in the material certificates.

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1.1.14 MC material certificates for NW Concrete, reinforcement and tendons as required by DNVGL-OS-C502Sec.4 shall be submitted.

1.1.15 Anchorage devices and mechanical splices shall be documented by product certificates, see DNVGL-OS-C502 Sec.4 G200.

1.1.16 Friction welded end anchorages on rebars (T-heads) shall be qualified tested in advance with theactual type of rebar and be routinely tested during production. The test program shall include a tension testand a bend test to document strength and ductility of the connection. The friction weld shall not fail beforethe rebar.

1.1.17 Welding procedures, together with the extent of testing for weld connections relevant to reinforcedconcrete and concrete structures, shall be specified and approved in each case.

1.1.18 The concrete material and steel material shall be documented in accordance with DNVGL-OS-C502Sec.4 A100.

2 Design principles


2.1.1 The design shall be performed according to the load and resistance factor design format (LRFDmethod) as detailed in DNVGL-OS-C502 Sec.6. The design shall be carried out for the limit states of strength(ULS), accident (ALS), fatigue (FLS) and serviceability (SLS).

2.1.2 Detailed design for structural capacity, water tightness (SLS), Fatigue life and Progressive collapse shallbe carried out in accordance with DNVGL-OS-C502 Sec.6.

2.1.3 The applied loads (ULS and SLS) on a concrete barge as defined in [3.1] and [3.2] are based on Rulesfor Classification of Ships Pt.3 combined with partial load factors as given in DNVGL-OS-C502 Sec.5 D.

2.1.4 Relevant accidental conditions (ALS) shall be included in the design, see DNVGL-OS-C502 Sec.5 C400.Accidental loads, including collision loads, shall not be less than in accordance with DNVGL-OS-A101 D.

2.1.5 Fatigue life (FLS) shall be carried out as given in DNVGL-OS-C502 Sec.6 M with minimum design life 20years.

Guidance note:The fatigue life may be calculated applying a long term distribution based on ULS loads, excluding partial load factors, of 20 years(108 cycles), assuming a Weibull shape parameter 1.0.


2.1.6 Response from hull girder loads and local pressures shall be combined in accordance with DNVGL-OS-C502 Sec.5 D.

2.1.7 In order to document transverse strength, the design shall be performed applying transverse hullgirder loads in combination with local loads. The vertical wave bending moments in transverse direction maybe based on [3.2.2], exchanging L with B, and applying kwm = 1.0 between port and starboard side. Thevertical wave shear forces in transverse direction may be based on [3.2.3], applying kwqp(n) = 0.7 betweenport and starboard side.

2.1.8 For barges with restricted service, CW and CWO applied in order to establish hull girder loads ([3.2])and local loads ([3.1]) may be reduced as given in Table 1.

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2.1.9 For barges intended to operate in a specific area, the wave induced hull girder loads, sea pressures andaccelerations may be based on wave load analysis applying site specific scatter diagram with minimum 20years return period. This limitation will then be stated in the Appendix to the Classification Certificate.

Guidance note:The wave load analysis should be carried out applying all headings and with Cos2 wave spreading profile. In order to documenttransverse strength, it is expected that beam sea with wave length approximately equal to the breadth of the barge will be will bedimensioning.


3 Loads

3.1 Local loads

3.1.1 The design sea pressure acting on side, bottom and weather deck shall be taken as the sum of thestatic and the dynamic pressure as:

— For load point below summer load waterline:

psea = 10 h0 f, G, Q + ksea pdp f, E (kN/m2)

— For load point above summer load waterline:

psea = ksea p2 f, E (kN/m2)

ksea = factor depending on limit state= 0.5 for SLS= 1.0 for ULS

γf, G, Q = partial load factor for permanent and functional loads as given in DNVGL-OS-C502 Sec.5 Dγf, E = partial load factor for environmental loads as given in DNVGL-OS-C502 Sec.5 Dpdp, p2 = dynamic sea pressure as given in Pt.3 Ch.4

3.1.2 All tanks shall be designed for the following internal design pressure:

pAV = ρ g0 hs f, G, Q + kaV ρ aZ f, E (kN/m2)

kaV = factor depending on limit state= 0.5 for SLS= 1.0 for ULS

γf, G, Q γf, E = as given in [3.1.1]hs = vertical distance in m from the load point to the top of tank, excluding smaller

hatchwaysaZ = vertical acceleration as given in Pt.3 Ch.4 Sec.3 [3.2.3], taken in centre of gravity of

tank

3.1.3 For tanks where the air pipe may be filled during filling operations, the following additional internaldesign pressure conditions shall be considered:

pd = (ρ g0 hs + Δpdyn) f, G, Q (kN/m2)

Δpdyn = calculated pressure drop as further described in Pt.3 Ch.4γf, G, Q = as given in [3.1.1]

Guidance note:

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This internal pressure needs not to be combined with extreme environmental loads. Normally only static global response need tobe considered.


3.1.4 The weather deck shall be designed for the following design pressure:

pdk = q(g0 f, G, Q + kaVaV f, E) (kN/m2)

q = deck loading in t/m2. q shall not be taken less than 0.7 T.γf, G, Q γf, E = as given in [3.1.1]

3.1.5 For concrete barges with L>100 m, the bottom forward shall be strengthened against slamming,applying the following impact pressure:

pslam = pslc3 f, E (kN/m2)

psl = design slamming pressure as given in Pt.3 Ch.1 Sec.6 [8.2.3]. In the formula for C2 the ballastdraught TBF may be substituted by full draught T.

C3 = load intensity factor as given in Pt.3 Ch.1 Sec.6 [8.2.11]γf, E = as given in [3.1.1]

Guidance note:This impact pressure is only to be considered for the ULS case and needs not to be combined with extreme environmental loads.Normally only static global response need to be considered.


3.1.6 The forces from cargo, equipment or other components acting on supporting structures should betaken as:

PVd = (g0 f, G, Q + kaVaV γf, E) M (kN)

PHd = (g0 f, G, Q + kaTaT γf, E) M (kN)

kaT = factor depending on limit state= 0.67 for SLS= 1.0 for ULS

kaV = as given in [3.1.2]aT = combined transverse acceleration as given in Pt.3 Ch.1 Sec.4 [2.7]aV = combined vertical acceleration as given in Pt.3 Ch.1 Sec.4 [2.6]γf, G, Q γf, E = as given in [3.1.1]M = mass of cargo, equipment or other components (t)PVd = vertical design forcePHd = horizontal design force

3.2 Hull girder loads

3.2.1 The design stillwater bending moments, Msw, and design stillwater shear forces, Qsw, shall be based onthe envelope curves representing all relevant loading conditions specified in the Trim & Stability booklet, andshall be combined with partial load factor for permanent loads as given in DNVGL-OS-C502 Sec.5 D.

3.2.2 The vertical wave bending moments at arbitrary positions along the length of the barge are normallynot to be taken less than:

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MWave = kglobalMW f, E (kNm)

Kglobal = factor depending on limit state= 0.59 for SLS= 1.0 for ULS

γf, E = partial load factor for environmental loads as given in DNVGL-OS-C502[5] DMW = rule-defined vertical wave bending moments as given in Pt.3 Ch.1 Sec.5 [2.2.2]

3.2.3 The vertical wave shear forces at arbitrary positions along the length of the barge are normally not tobe taken less than:

QWave = kglobalQWP(WN) f, E (kNm)

kglobal, γf, E = as given in [3.2.2]QWP(WN) = Rule-defined vertical wave shear forces as given in Pt.3 Ch.1 Sec.5 [2.2.3]

4 Design resistance


4.1.1 The characteristic resistance of a cross-section or a structural member shall be derived fromcharacteristic values of material properties and nominal geometrical dimensions. The design resistance shallbe determined in accordance with the approach outlined in DNVGL-OS-C502 Sec.6.

4.1.2 The design shall document adequate strength and tightness in all design situations. The necessarylimitation in concrete stresses, reinforcement stress and crack width to ensure water tightness is provided inDNVGL-OS-C502 Sec.6 O600.

4.1.3 DNVGL-OS-C502 Sec.6 B contains detailed information on the different limit states, characteristicvalues for material strength to be used in design, partial safety factors for material, and design by testing asa special case.

4.1.4 DNVGL-OS-C502 Sec.6 C specifies design material strength, material coefficients, stress-strain curves,temperature effects and creep.

4.1.5 Calculation approach for prediction of bending moment capacity is provided in DNVGL-OS-C502 Sec.6D.

4.1.6 Provisions for design of slender members are given in DNVGL-OS-C502 Sec.6 E.

4.1.7 Provisions for predicting the shear capacity of hull and plates are provided in DNVGL-OS-C502 Sec.6 F.

4.1.8 Provisions for predicting the combined bending, shear and torsion capacity are provided in DNVGL-OS-C502 Sec.6 G.

4.1.9 DNVGL-OS-C502 Sec.6 H provides a general method for predicting the shear strength of structuralmembers subjected to in-plane shear forces.

4.1.10 DNVGL-OS-C502 Sec.6 J provides requirements for shear strength of construction joints.

4.1.11 DNVGL-OS-C502 Sec.6 K provides requirement for design of bond strength and anchorage strengthof reinforcement bars.

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4.1.12 DNVGL-OS-C502 Sec.6 L provides requirements for design of partly loaded areas in ULS.

4.1.13 The fatigue strength shall be designed and evaluated in accordance with the provisions of DNVGL-OS-C502 Sec.6 M.

4.1.14 The strength in accidental limit state shall be predicted based on DNVGL-OS-C502 Sec.6 N.

4.1.15 Durability, cracking, tightness and deflections are controlled by SLS. The SLS requirements areprovided in DNVGL-OS-C502 Sec.6 O.

4.1.16 Requirements for design by testing are provided in DNVGL-OS-C502 Sect.6 P.

4.1.17 Placing and detailing of the reinforcement are both important for the hull durability. Provisions fordetailing including requirements for minimum amount of reinforcement in the concrete section are providedin DNVGL-OS-C502 Sec.6 Q. For concrete barges, the minimum concrete cover to reinforcement may bereduced to 25 mm, provided the concrete is covered with an elastic epoxy-based coating.

4.1.18 Provisions for designing concrete members with fibre reinforcement are provided in DNVGL-OS-C502Sec.6 S.

4.1.19 Provisions for the design of structural members in which concrete is replaced by structural grout aregiven in DNVGL-OS-C502 Sec.6 T.

4.1.20 Provisions for the design of structural members in which concrete is replaced by fibre reinforcedstructural grout are given in DNVGL-OS-C502 Sec.6 U.

4.1.21 For design of a composite steel-concrete hull, provisions are given in DNVGL-OS-C502 Sect.6 A500.When designing for composite action between concrete and steel plating, then sufficient number of studsshall be provided.

5 Survey and testing

5.1 Survey and testing during newbuilding of concrete barges

5.1.1 The construction of the concrete barge shall be planned and executed in accordance with theprovisions of DNVGL-OS-C502 Sec.7.

5.1.2 A quality management system based on the requirement of EN ISO 9001 or equivalent shall be appliedduring construction of the barge.

5.1.3 The requirements given in DNVGL-OS-C502 Sec.7 with respect to construction documentation, qualitycontrol, construction planning, materials, material certificates, material testing, formwork, tolerances, precastconcrete elements, reinforcement, production of concrete and grout, transport, compaction and curing ofconcrete, repairs, corrosion protection, site records and As Built documentation shall be complied with, asfound relevant.

5.1.4 The Society will as part of classification, review site records and review on-going activities to ensurethat the construction is in accordance with design intent.

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5.2 Survey and testing after delivery of concrete barges

5.2.1 For hull and equipment, concrete barges are in general to follow the survey intervals and extent asgiven in Pt.7 Ch.1 Sec.2 [2] for annual surveys, Pt.7 Ch.1 Sec.3 [2] for intermediate surveys, and Pt.7 Ch.1Sec.4 [2] for renewal surveys.

5.2.2 The requirements for dry-docking as given in Pt.7 Ch.1 Sec.5 [1.1.3] may be dispensed from, providedthe bottom survey is carried out afloat according to the requirements for the class notation BIS. This willthen be stated in the appendix to the class certificate.

5.2.3 In addition to the survey extent given in [5.2.1], the concrete barge is subject to an In-serviceInspection scheme. This scheme shall be further specified in an In-service Inspection manual as part of asbuilt documentation, and shall be harmonized with the periodic survey intervals given in [5.2.1] as far aspossible.

5.2.4 The objective of the In-service Inspection is described in DNVGL-OS-C502 Sec.8. The overall objectivefor the inspection program is to ensure that the barge is suitable for its intended purpose throughout itslifetime.

5.2.5 The scope of the In-service Inspection is described in DNVGL-OS-C502 Sec.8. An In-service Inspectionprogramme shall be prepared as part of the design process considering safety, environmental consequencesand total life cycle costs.

5.2.6 In preparing the inspection programme, special attention shall be paid on observing deteriorationmechanisms for the relevant materials and structural components.

5.2.7 The inspection and monitoring types relevant for the concrete hull is defined in DNVGL-OS-C502 Sec.8A1000.

5.2.8 If protective coating is applied in accordance with 517, the coating shall be intact throughout theworking life of the barge.

DNV GLDriven by our purpose of safeguarding life, property and the environment, DNV GL enablesorganizations to advance the safety and sustainability of their business. We provide classification andtechnical assurance along with software and independent expert advisory services to the maritime,oil and gas, and energy industries. We also provide certification services to customers across a widerange of industries. Operating in more than 100 countries, our 16 000 professionals are dedicated tohelping our customers make the world safer, smarter and greener.

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