dnvgl-ru-hslc-pt3ch6 stability, watertight integrity, and

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DNV GL AS

RULES FOR CLASSIFICATION

High speed and light craftEdition December 2015

Part 3 Structures, equipment

Chapter 6 Stability, watertight integrity,and closing appliances

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 December 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: High speed and light craft — DNVGL-RU-HSLC-Pt3Ch6. Edition December 2015 Stability, watertight integrity, and closing appliances

DNV GL AS

CURRENT – CHANGES

This is a new document.

The rules enter into force 1 July 2016.

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CONTENTS

Current – changes...................................................................................................... 3

Section 1 General Requirements................................................................................ 61 General................................................................................................... 6

1.1 Objective.............................................................................................61.2 Application.......................................................................................... 61.3 Documentation.....................................................................................61.4 Product certification..............................................................................8

Section 2 Stability...................................................................................................... 91 Inclining and stability information......................................................... 9

1.1 General...............................................................................................92 Intact stability requirements................................................................ 103 Ice accretion applicable to all types of craft.........................................10

Section 3 Water and weathertight integrity............................................................. 111 Internal openings, watertight integrity................................................ 11

1.1 General............................................................................................. 111.2 Operation.......................................................................................... 111.3 Strength............................................................................................11

2 Skirts protecting access to flexibly mounted superstructure anddeckhouses...........................................................................................12

2.1 General............................................................................................. 123 External openings for weatherthight integrity...................................... 12

3.1 External openings...............................................................................123.2 Weathertight hatches.......................................................................... 123.3 Weathertight Doors.............................................................................133.4 Machinery space openings................................................................... 143.5 Miscellaneous openings in exposed decks.............................................. 153.6 Ventilation Openings........................................................................... 15

4 Scuppers, inlets and discharges........................................................... 164.1 General............................................................................................. 16

5 Air pipes............................................................................................... 175.1 General............................................................................................. 17

6 Freeing ports........................................................................................ 176.1 General............................................................................................. 17

7 Windows............................................................................................... 18

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7.1 General............................................................................................. 187.2 Window thickness...............................................................................187.3 Direct glazing.................................................................................... 207.4 Deadlights......................................................................................... 21

Section 4 Miscellaneous........................................................................................... 221 Marking and recording of the design waterline.....................................222 Protection of the crew and passengers.................................................22

2.1 General............................................................................................. 22

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SECTION 1 GENERAL REQUIREMENTS

1 General

1.1 Objective

1.1.1 The objective of this chapter is to define requirements related to stability, water and weathertightintegrity and closing appliances.

Guidance note:Several of the requirements are based on the International Code of Safety for High-Speed Craft, 2000 (2000 HSC Code). Theserequirements, or the Society’s interpretation of such, shall be considered as being adopted as the Society’s own requirements. Theintention of the chapter is not to cover the full scope of the corresponding chapters of the 2000 HSC Code and additional requirementsmay have to be complied with for full 2000 HSC Code compliance.

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1.2 Application

1.2.1 The requirements of this chapter apply to high speed and light craft for the assignment of main class.In addition to the requirements stipulated in this chapter all craft shall be in compliance with the 2000 HSCCode Ch.2 Part A 2.1 and 2.2.6.

1.3 Documentation

1.3.1 Documentation shall be submitted as required by Table 1.

Table 1 Documentation requirements

Object Documentation type Additional description / required data Info

B050 – Preliminary stability manual AP

B010 – Lines plan and offset tables FI

B020 – External watertight integrityplan FI

B110 - Inclining test or lightweightsurvey report AP

Stability

B120 – Final stability manual AP

C030 – Detailed drawingDoors, ramps, securing devices and lockingdevices. Including specification of designpressure shall.

APShell doors

Z030 - Arrangement plan Bow, stern and side doors. FI

Z030 – Arrangement plan FI

Cargo hatchesC030 – Detailed drawing Including covers and opening, closing, sealing,

securing and locking devices. AP

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Object Documentation type Additional description / required data Info

B200 – Freeboard plan AP

Z030 – Arrangement plan FIExternal watertight andweathertight integrity

C030 – Detailed drawing Doors, hatches, securing devices and lockingdevices. Design pressure shall be specified. AP

H050 – Structural drawing Hatch covers, securing devices and lockingdevices. Design pressure shall be specified. AP

Service hatchways

Z030 - Arrangement plan FI

C030 - Detailed drawing Doors, securing devices and locking devices.Including specification of design pressure. AP

Z030 - Arrangement planInternal watertight doors /ramps

I200 - Control and monitoringsystem documentation

FI

C030 – Detailed drawing

Including glazing material specification, maindimensions, method of attachment, deadlightspecification. Including specification of designpressure.

APWindows and side scuttles

Z030 - Arrangement plan FI

AP=For approval; FI=For informationACO=As carried out; L=Local handling; R=On request; TA=Covered by type approval; VS=Vessel specific

For general requirements to documentation, including definition of the info codes, see SHIP Pt.1 Ch.3 Sec.2.For a full definition of the documentation types, see RU SHIP Pt.1 Ch.3 Sec.3.

Guidance note:Details of stability items in [1.2.1] are given in DNVGL-CG-0157Stability documentation for approval


1.3.2 For instrumentation and automation, including computer based control and monitoring, see Pt.4 Ch.9Sec.1.

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1.4 Product certification

1.4.1 For products that shall be installed on board, the Builder shall request the Manufacturers to ordercertification as described in Table 2.

Table 2 Certification requirements

Object Certificatetype Issued by Certification

standard* Additional description

PC SocietyWatertight doors. Type Approval may be acceptedin lieu of PC in accordance with 2000 HSC CodeCh.2.2.2.2Doors

TA Society Weathertight doors

PC SocietyWatertight hatches. Type Approval may beaccepted in lieu of PC in accordance with 2000HSC Code Ch.2.2.2.2Hatches

TA Society Weathertight hatches, including flush hatches

Windows TA Society Adhesives, see Sec.3 [7.3]

* Unless otherwise specified the certification standard is the rules.

1.4.2 For general certification requirements, see Pt.1 Ch.3 Sec.4.

1.4.3 For a definition of the certification types, see Pt.1 Ch.1 Sec.4 and Pt.1 Ch.3 Sec.5.

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SECTION 2 STABILITY

1 Inclining and stability information

1.1 General

1.1.1 Loading conditions representative for the intended service shall be presented in the stability manual.

1.1.2 If no stability limit curves are presented, the presented loading conditions will be considered as limitingfor the vessel’s operation.

1.1.3 The loading conditions shall be within the limit curves and/or shall comply with the required stabilitycriteria.

1.1.4 If a loading computer is installed for the purpose of determining the craft’s trim and stability, and alsoascertain and record that the craft is in compliance with the stability criteria of the relevant requirements, itis subject to approval (see RU SHIPS Pt.6 Ch.4 Sec.7).

1.1.5 Additionally, 2000 HSC Code 2.7 and 2.8 shall be followed.Guidance note:The inclining test/lightweight survey shall be performed in accordance with the approved procedure according to [1.2] and in thepresence of the Society’s representative.For the second and subsequent craft in a series, a lightweight survey may be accepted in lieu of an inclining test. This, however, shallnot be generally permitted in cases where the lightweight exceeds 75% of the maximum displacement.If the lightweight survey reveals significant difference between lightweight data obtained from the inclining test of the first craftand the lightweight survey of the sister craft, an inclining test may be required for the latter. Alternatively, the difference shall bepositioned at the most unfavourable position, when calculating the vertical centre of gravity.In cases where it is practically impossible to perform an inclining test due to structural limitation or similar, a lightweight surveymay be accepted also for the first craft.In such a case, a detailed lightweight estimate shall be worked out before the survey and checked “as built” to the satisfaction ofthe surveyor. This shall be considered as basis for comparison with the result of the lightweight survey, and submitted together withthe lightweight survey report, at the latest.A safety margin of 10% shall be added to the estimated VCG and the value including margin shall be used when calculating thefinal VCG after the lightweight survey.Any difference in lightship weight between the estimate and the result from the lightweight survey, which can not be justified, shallbe positioned at the most unfavourable position, when calculating the vertical centre of gravity. I.e., any increase to be placed atthe uppermost deck, and any decrease to be placed at keel height.If the lightweight survey reveals significant difference (more than 2%) between lightship weight obtained from the lightweightestimate and the lightweight survey, then the validity of the estimate should be reconsidered.The approved lightweight data and definition, i.e. items included/not included in the lightweight shall be included in the stabilitymanual.If lightweight alterations exceed 1% of the maximum displacement, the lightweight data shall be updated and submitted for approval.The stability manual shall be revised accordingly.


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2 Intact stability requirementsAll high speed craft shall comply with the intact stability requirements of the 2000 HSC Code 2.2.1, 2.3, 2.4and 2.5. Intact stability criteria are given in Annex 7 for multihulls and in Annex 8 for monohulls. Hydrofoilboats shall comply with the requirements outlined in the 2000 HSC Code Annex 6.

3 Ice accretion applicable to all types of craftAll types of crafts shall comply with the requirements outlined in the 2000 HSC Code Annex 5.

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SECTION 3 WATER AND WEATHERTIGHT INTEGRITY

1 Internal openings, watertight integrity

1.1 General

1.1.1 General requirements for internal openings in connection with watertight integrity are given in Ch.1Sec.1 [3.4] and in the 2000 HSC Code 2.2.2.

1.1.2 Watertight doors and hatches shall be either of the hinged or sliding type.

1.1.3 Hinged doors or hatches shall have mechanical securing devices and may be fitted between decksin approved positions. Hinged doors shall not be used where remote control is required. Hinged doors forpassage shall be of quick acting or single acting type. Indication open/closed shall be fitted on the bridge.

1.1.4 Sliding doors may be hand operated only, or both power and hand operated. A positive force shallbe required to re-open the doors. Sliding doors shall have an indication (i.e. a red light) placed locally onboth sides of the adjacent structure to show that the door is in the remote control mode. Signboards andinstructions shall be placed in way of the door advising how to act when the door is in the “door closed”mode. In passenger areas and areas of high ambient noise, audible alarms shall be supplemented by visualsignals on both sides of the door.

1.2 Operation

1.2.1 All watertight doors and access hatches shall be operable from both sides of the bulkhead or deck.

1.2.2 Remotely controlled doors shall also be locally operable from both sides. Indicators shall be provided atthe bridge control position to indicate whether the doors are open or closed.

1.3 Strength

1.3.1 Watertight doors and hatches shall withstand the design pressure from both sides. The panel thicknessshall in no case be less than the required thickness of the surrounding structure.FRP doors and hatch covers shall be tested for a hydraulic pressure of 2 times design pressure for which theyshall be approved. There shall be no signs of cracks, deformation or other damages after the testing.

1.3.2 Edge stiffness of doors shall have a moment of inertia not less than:

d = distance between closing devices in m, to be measured along door edgepe = pb, packing line pressure along edges, not to be taken less than 5 N/mmp = design pressure as given in Ch.1 Sec.2 [3.5.3]b = load breadth, normally taken as h/3 or w/2, whichever is the less.

h and w are height and width of door in m.

The coaming (door frame) shall be designed with the necessary stiffness in order to avoid large deflectionsresulting in leakage in the damaged condition.

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1.3.3 The stiffness requirements in [1.3.2] may be omitted by performing a structural analysis which shallinclude the flexibility of both the door and the surrounding structure.

1.3.4 Securing devices shall be designed for the load acting on the side of where they are positioned.Allowable stresses for securing devices are as follows for steel:

normal stress

shear stress

equivalent stress

1.3.5 Doors and hatch covers which become immersed by the equilibrium or the intermediate water planein a damaged condition shall be subjected to a hydrostatic pressure test. The head of water used for thepressure test shall correspond at least to the head measured from the lower edge of the door opening, atthe location in which the door shall be fitted in the vessel, to the most unfavorable damage waterplane. Theacceptance criterion for the test is no leakage.

1.3.6 The bottom section of the coaming shall have no groove in which dirt might lodge causing improperclosing of the door.

2 Skirts protecting access to flexibly mounted superstructure anddeckhouses

2.1 General

2.1.1 Where access is provided to the hull through flexibly mounted superstructure the weathertight integrityof the connection between the hull and the superstructure shall be maintained. This connection shall beapproved and tested for a pressure of 6 kN/m2.

2.1.2 For flexible material used for the connection, the longevity and durability of the material shall beappropriate for 5 years operation. Information justifying this shall be submitted.

2.1.3 A maintenance scheme for the flexible connection shall be submitted and shall be included in thevessel operation manual.

3 External openings for weatherthight integrity

3.1 External openingsAll external openings which may become submerged within the required range of stability shall haveweathertight closing appliances. Small openings through which progressive flooding may not occur need notbe so equipped.

3.2 Weathertight hatches

3.2.1 Weathertight hatches shall be fitted in all external access openings in the weather deck.

3.2.2 Weathertight hatches shall be of equivalent strength as the surrounding structure and hose-testedafter installation.

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3.2.3 Hatches shall in all cases open outwards.Guidance note:The hinges shall be fitted such that the predominant direction of green sea will cause the cover to close, which means that the hingesare normally to be located on the fore edge.


3.2.4 Weathertight hatches shall be so arranged that they are operable from both sides.Guidance note:Bolted or similar permanently fitted hatches, for example hatches used for equipment installation and removal, are not consideredaccess hatches.


3.2.5 The minimum height of coamings for access hatches with weathertight covers is normally not to beless than:

— Hatchways on weather deck, giving access to spaces below the weather deck shall have a coaming heightnot less than 250 mm.

— Hatchways on weather deck not giving access to spaces below the weather deck and not necessary for theoperation of the vessel at sea shall have a coaming height of not less than 100 mm.

— Hatchways in this position which are necessary for the operation of the vessel at sea shall have a coamingheight of not less than 250 mm.

3.2.6 The use of flush hatches, except for escape hatches from below the weather deck, will be acceptedprovided:

— The hatch is permanently marked ‘to be kept closed at sea’

3.2.7 For accommodation spaces below the weather deck which are only used in port, the use of flushescape hatches may be accepted provided:

— The escape hatch shall be permently marked ‘to be kept closed at sea’— The primary access shall be permanently marked ‘No access while at sea’

3.3 Weathertight Doors

3.3.1 Weathertight doors shall be fitted in all access openings in:

— bulkheads at ends of superstructures— bulkheads of deckhouses on weather deck protecting openings in the weather deck— companionways— bulkheads of deckhouses on the deck above the weather deck protecting openings in this deck— companionways and bulkheads of deckhouses situated on the top of a deckhouse on the weather deck,

protecting openings to spaces below the weather deck.

3.3.2 The doors shall be permanently attached to the bulkhead and shall be so arranged that they can beoperated from both sides of the bulkhead.

Guidance note:Doors should generally open outwards, with hinges in forward direction, to provide easy evacuation of passengers and crew andadditional security against impact of the sea.


3.3.3 Weathertight doors shall as a minimum have the same strength as their surrounding structure andmay be made of steel, aluminium or FRP.

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3.3.4 Weathertight doors shall be fitted with gasket and a sufficient number of clamping devices. Thegasket shall be protected from mechanical abrasion. The clamping of the door shall be arranged to preventovercompression of the gasket. The number of clamping devices shall normally be in accordance with Table1.

Table 1 Number of clamping devices

Position No.

Long side> 1500 mm< 1500 mm

32

Short side> 700 mm< 700 mm

10

Doors with hinges acting as clamping means may be accepted provided the hinges are both adjustable anddesigned with circular hinge pin holes.The hinges shall only be fitted with oval hinge pin holes if separate clamping devices are fitted to the sameedge.

3.3.5 For weathertight doors in companionways and deckhouses on superstructure deck in vessels withservice restriction R3 and R4, reduced clamping may be accepted based on special consideration.

3.3.6 Doors in superstructures or companionways on weather deck, giving access to spaces below theweather deck shall have sill height not less than 250 mm.

3.3.7 Doors in superstructures and deckhouses on weather deck not giving access to spaces below theweather deck and not necessary for the operation of the vessel at sea shall have sill heights of not less than100 mm. Doors in this position which are necessary for the operation of the vessel at sea shall have sillheights of not less than 250 mm.

3.4 Machinery space openings

3.4.1 Machinery space openings shall be properly framed and efficiently enclosed by casings of amplestrength and, where the casings are not protected by other structures, their strength shall be speciallyconsidered. Access openings in such casings shall be fitted with weathertight doors.(Requirement based on 2000 HSC 2.2.8.2.1)

3.4.2 Heights of sills and coaming shall, in general, not be less than 100 mm for openings to weathertightspaces on decks above the weather deck, and 380 mm elsewhere. For craft of 30 m in length and under,these heights may be reduced to the maximum which is consistent with the safe working of the craft.(Requirement based on 2000 HSC 2.2.8.2.2)

3.4.3 Ventilators the coamings of which extend to more than one metre above deck or which are fitted todecks above the weather deck need not be fitted with closing arrangements unless they face forward or arespecifically required by the Society.(Requirement based on 2000 HSC 2.2.8.4.2)

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3.5 Miscellaneous openings in exposed decks

3.5.1 Manholes and flush scuttles on the weather deck or within superstructures and deckhouses other thanenclosed superstructures shall be closed by substantial covers capable of being made watertight. Unlesssecured by closely spaced bolts, the covers shall be permanently attached.(Requirement based on 2000 HSC Code 2.2.8.3.1)

3.5.2 Service hatches to machinery, etc. may be arranged as flush hatches provided that the covers aresecured by closely spaced bolts, are kept closed at sea, and are equipped with arrangements for portableguardrails.(Requirement based on 2000 HSC Code 2.2.8.3.2)

3.5.3 Openings in exposed decks leading to spaces below the weather deck or enclosed superstructuresother than hatchways, machinery space openings, manholes and flush scuttles shall be protected by anenclosed superstructure, or by a deckhouse or companionway of equivalent strength and weathertightness.(Requirement based on 2000 HSC Code 2.2.8.3.3)

3.6 Ventilation Openings

3.6.1 The lower edge of ventilation openings shall be located at a height, Hv, above the waterline, in thedisplacement mode in the fully loaded condition, not less than given in Table 2.

Table 2 Lower edge of air intake and ventilation openings

Service restriction Hv (m)

R0

R1

R2

R3

0.05 L, minimum 2.30 m

0.04 L, minimum 2.00 m

0.035 L, minimum 1.70 m

0.035 L, minimum 1.70 m

R4, R5 and R6 will be specially considered.

For ventilation openings which are not necessary for the operation of the vessel at sea, a reduced Hv may beconsidered. In that cases permanently fitted closing devices shall be available.

3.6.2 Ventilation openings which are necessary for the operation of the vessel at sea, shall be arranged witha coaming above the level of the deck where it is located. The height of this coaming shall be at least 380mm on the weather deck and 100 mm elsewhere.

3.6.3 Ventilation openings shall be fitted with screens preventing ingress of water spray and are preferably tobe facing aft or athwartships.

3.6.4 Ventilation openings facing forward shall be fitted with a drainage system preventing water fromentering the opening.

3.6.5 Direct air intakes for machinery shall have a protecting grate and a water trap system.

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4 Scuppers, inlets and discharges

4.1 General

4.1.1 Discharges led through the shell either from spaces below the weather deck or from withinsuperstructures and deckhouses fitted above the weather deck shall be fitted with efficient and accessiblemeans for preventing water from passing inboard. Normally each separate discharge shall have oneautomatic non-return valve with a positive means of closing it from a position above the weather deck.Where, however, the vertical distance from the design waterline to the inboard end of the discharge pipeexceeds 0.01L, the discharge may have two automatic non-return valves without positive means of closing,provided that the inboard valve is always accessible for examination under service conditions. Where thatvertical distance exceeds 0.02L, a single automatic non-return valve without positive means of closing maybe accepted. The means for operating the positive action valve shall be readily accessible and provided withan indicator showing whether the valve is open or closed.(Requirement based on 2000 HSC Code 2.2.9.1)

4.1.2 Valves on scuppers from weathertight compartments included in the stability calculations shall beoperable from the operating compartment.(Requirement based on 2000 HSC Code 2.2.9.2)

4.1.3 In manned machinery spaces, main and auxiliary sea inlets and discharges in connection with the operationof machinery may be controlled locally. Such controls shall be readily accessible and shall be providedwith indicators showing whether the valves are open or closed. In unmanned machinery spaces, main andauxiliary sea inlet and discharge controls in connection with the operation of machinery shall either:

1) be located at least 50% of the significant wave height corresponding to the worst intended conditionsabove the deepest flooded waterline following damage specified in 2.6.6 to 2.6.10; or

2) be operable from the operating compartment.(Requirement based on 2000 HSC Code 2.2.9.3)

4.1.4 Scuppers leading from superstructures or deckhouses not fitted with weathertight doors shall beled overboard.(Requirement based on 2000 HSC Code 2.2.9.4)

4.1.5 All shell fittings and the valves required by this Code shall be of a suitable ductile material. Valvesof ordinary cast iron or similar material shall not be acceptable.(Requirement based on 2000 HSC Code 2.2.9.5)

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5 Air pipes

5.1 General

5.1.1 Main storage tanks containing flammable liquids or tanks which can be pumped or filled from thesea shall have air pipes which do not terminate in enclosed spaces.(Requirement based on 2000 HSC Code 2.2.10.1)

5.1.2 All air pipes extending to exposed decks shall have a height from the deck to the point wherewater may have access below of at least 300 mm where the deck is less than 0.05L above the designwaterline, and 150 mm on all other decks.(Requirement based on 2000 HSC Code 2.2.10.2)

5.1.3 Air pipes may discharge through the side of the superstructure provided that this is at a height ofat least 0.02L above any waterline when the intact craft is heeled to an angle of 15° or 0.02L above thehighest waterline at all stages of flooding as determined by the damaged stability calculations, whicheveris higher.(Requirement based on 2000 HSC Code 2.2.10.3)

5.1.4 All air pipes shall be equipped with weathertight closing devices that close automatically.(Requirement based on 2000 HSC Code 2.2.10.4)

6 Freeing ports

6.1 General

6.1.1 Where bulwarks on weather decks form wells, ample provision shall be made for rapidly freeing thedecks of water and for draining them. The minimum freeing port area (A) on each side of the craft for eachwell on the weather deck of the main hull(s) shall be:

1) where the length of bulwark (l) in the well is 20 m or less:

A = 0.7 + 0.035 l (m²); and2) where l exceeds 20 m:

A = 0.07 l (m²),

and, in no case, l need be taken as greater than 0.7L.If the bulwark is more than 1.2 m in average height, the required area shall be increased by 0.004 m2 permetre of length of well for each 0.1 m difference in height. If the bulwark is less than 0.9 m in averageheight, the required area shall be decreased by 0.004 m2 per metre of length of well for each 0.1 mdifference in height.(Requirement based on 2000 HSC Code 2.2.11.1)

6.1.2 Such freeing ports shall be located within the height of 0.6 m above the deck and the lower edge shallbe within 0.02 m above the deck. 2.2.11.3 All such openings in the bulwarks shall be protected by rails orbars spaced approximately 230 mm apart. If shutters are fitted to freeing ports, ample clearance shall beprovided to prevent jamming. Hinges shall have pins or bearings of non-corrodible material. If shutters arefitted with securing appliances, these appliances shall be of approved construction.

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(Requirement based on 2000 HSC Code 2.2.11.2)

6.1.3 Craft, having superstructures which are open in front or both ends, shall comply with the provisions of2.2.11.1.(Requirement based on 2000 HSC Code 2.2.11.3)

6.1.4 In craft, having superstructures which are open at the aft end, the minimum freeing port area shall be:

A = 0.3b (m²)where:b = the breadth of the craft at the exposed deck (m).(Requirement based on 2000 HSC Code 2.2.11.4)

6.1.5 Ro-ro craft fitted with bow loading openings leading to open vehicle spaces shall comply with the provisionsof [2.2.3].(Requirement based on 2000 HSC Code 2.2.11.5)

7 Windows

7.1 General

7.1.1 All windows in superstructures and deckhouses shall be of toughened glass and firmly mounted in stiffaluminium frames or equivalent.

Guidance note:For windows in other positions than the wheelhouse front materials other than those specified in [7.2.1] may be accepted basedon case-by-case consideration.


In superstructure sides the windows shall be placed inside outer point of side.

7.1.2 For craft with service restriction R4 and stricter rubber frames may be accepted, provided the crosssection is designed as to increase the grip on the glass as the lateral pressure from outside is increased.

7.1.3 Window glass panes with heating wires are to be considered with regard to their reduced strength.

7.1.4 The cut-outs for windows shall have well-rounded corners.

7.2 Window thickness

7.2.1 The thickness of window panes is in general not to be less than:

b = small dimension of window opening in mmKw = 225 for chemically toughened glass (CTG)

= 225 for thermally toughened glass (TTG)= for thermally toughened glass (TTG)

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= 190 for polymethylmethacrylate (PMMA)= 190 for polycarbonate (PC)

p = lateral pressure according to Ch.1 Sec.2ß = factor taken from Figure 1, dependent on the aspect ratio of the window.

Guidance note:Please note that use of combustible materials in windows can be restricted or prohibited for crafts built according to class notationPassenger craft, Ferry and Cargo.


PC and PMMA window panes shall overlap their frames with not less than 0.03b (mm).

Figure 1 Diagram for factor for windows

Laminated glass shall comply with the following requirements:

i = number of glass layersti = thickness of glass layer no.tw = required thickness calculated according to [7.2.1].

Each glass layer shall be of toughened glass.

7.2.2 The thickness of window panes may be reduced from that given by the formula in [7.2.1] if they aresatisfactorily pressure tested as described in [7.2.4] and [7.2.5].The window thickness is in no case to be less than 5 mm.

7.2.3 The test pressure is not to be taken less than 4 times the design pressure p in Ch.1 Sec.2 fortoughened glass, and 3.5 times the design pressure for polycarbonate.

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7.2.4 During the testing the window shall be fitted in similar arrangement as to be installed onboard thecraft. The testing may be considered satisfactory provided:

— no failure in window or attachment method— no leakages occur.

Guidance note:Large glass doors or windows in the aft end of superstructures or deckhouses will be especially considered.


7.3 Direct glazing

7.3.1 Window panes may be fastened to the supporting structure by adhesively bonded joints without anycounter frame or mechanical fasteners. However, the weight of the window pane is normally to be carried byat least two support blocks along the lower edge.

7.3.2 The resistance of the adhesive to UV-light, high and low temperatures, cleaning chemicals, etc.shall be documented. Alternatively, the adhesive joint can be protected against such effects. The long timebehaviour of the adhesive with respect to retention of adhesive and cohesive strength and elasticity and thecreep properties shall be documented.

7.3.3 The joint width is not to be less than:

dmin = 0.02 b (mm)b = length of shortest window side (mm)Pw = wind suction load

= 1.25 ∙ 10-3 (50 + 0.5 V)2 (kN/m2)V = the speed in knotsσt = tensile strength for the glue at 12.5% elongation (MPa)

The joint depth (thickness of glue) shall be not less than:

tmin = 6 mm, but not less than d/2 for d > 12 mmk = 1.5 for glassk = 8.0 for polycarbonatel = length of longest window side (mm).

For rectangular windows with l/b > 2, mounted with the longest side in the horizontal direction, and with thelower edge mechanically secured against in-plane movement, l in the formula above shall be substituted by2b.

7.3.4 Adhesives for direct glazing shall comply with the following minimum requirements:

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— cohesive fracture— minimum tensile strength at 12.5% elongation: 0.14 MPa— minimum ultimate tensile strength: 0.07 MPa— minimum fracture elongation: 50%

Testing shall be carried out according to ISO 8339.The short and long term performance of the adhesion between adhesive and substrate material shall bedocumented.

7.3.5 Direct glazing shall be carried out in accordance with documented procedures covering the following:

— environmental conditions— surface preparation— glue application— curing time or conditions— inspection and testing.

The procedures shall be in accordance with the adhesive manufacturers instructions and specifications.

7.4 Deadlights

7.4.1 The number of deadlights in relation to the number of windows is at least to be as follows dependingon the service restriction notations (R):

Table 3 Minimum number of deadlights in relation to number of windows

Location R0 R1 R2 R3 R4-R6

Below weather deck 100% 100% 100% 100% 100%

Superstructure and deckhouse front 1sttier

100% 100% [8.4.4] 0

Superstructure and deckhouse side 1 sttier

[7.4.4] 0 0

Superstructure and deckhouse front 2ndtier and above

[7.4.4] 0 0

Superstructure and deckhouse side 2ndtier and above

[7.4.4] 0 0

7.4.2 Below the weather deck deadlights shall be permanently mounted and shall have the same strength asthe surrounding structure.

7.4.3 Deadlights above the weather deck, for which there is 100% requirement, shall have the samestrength as the surrounding structure.

7.4.4 Areas for which there is not 100% requirement shall be provided with adequate means (e.g. canvas)for temporary replacement of a damaged window, protecting crew and passengers from sea spray and wind.

7.4.5 Deadlights shall be stowed in such a way as to provide quick mounting.

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SECTION 4 MISCELLANEOUS

1 Marking and recording of the design waterlineMarking and recording of the design waterline and the load line mark shall be in compliance with the 2000HSC Code 2.9.

2 Protection of the crew and passengers

2.1 General

2.1.1 Efficient guard rails or bulwarks shall be fitted on all exposed parts of decks to which crew orpassengers have access. Alternative arrangements such as safety harnesses and jack-stays may be acceptedif they provide an equivalent level of safety. The height of the bulwarks or guardrails shall be at least 1mfrom the deck, provided that, where this height would interfere with the normal operation of the craft, alesser height may be approved.(Requirement based on 2000 HSC Code 4.11.1)

2.1.2 The opening below the lowest course of the guardrails shall not exceed 230 mm. The other coursesshall not be more than 380 mm apart. In the case of craft with rounded gunwales, the guardrail supportsshall be placed on the flat of the deck.(Requirement based on 2000 HSC Code 4.11.2)

2.1.3 Satisfactory means (in form of guardrails, lifelines, gangways or under-deck passages, etc.) shall beprovided for the protection of the crew in getting to and from their quarters, the machinery space and allother parts used in the necessary work of the craft.(Requirement based on 2000 HSC Code 4.11.3)

2.1.4 Deck cargo carried on any craft shall be so stowed the any opening which is in way of the cargoand which gives access to and from the crew’s quarters, the machinery space and all other parts used inthe necessary work of the craft can be properly closed and secured against admission of water. Effectiveprotection for the crew in the form of guardrails or lifelines shall be provided above the deck cargo if there isno convenient passage on or below the deck of the craft.(Requirement based on 2000 HSC Code 4.11.4)

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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dnvgl-ru-hslc-pt3ch6 stability, watertight integrity, and

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