RULES FOR CLASSIFICATION - High speed and light craft
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RULES FOR CLASSIFICATION
High speed and light craft
Edition July 2020
Part 3 Structures, equipment
Chapter 6 Stability, watertight integrity,
and closing appliances
The content of this service document is the subject of intellectual property rights reserved by DNV GL AS ("DNV GL"). The user
accepts that it is prohibited by anyone else but DNV GL and/or its licensees to offer and/or perform classification, certification
and/or verification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the
basis of and/or pursuant to this document whether free of charge or chargeable, without DNV GL's prior written consent.
DNV GL is not responsible for the consequences arising from any use of this document by others.
The electronic PDF version of this document, available at the DNV GL website dnvgl.com, is the official, binding version.
DNV GL ASFOREWORD
DNV GL rules for classification contain procedural and technical requirements related to obtaining
and retaining a class certificate. The rules represent all requirements adopted by the Society as
basis for classification.
© DNV GL AS July 2020
Any comments may be sent by e-mail to rules@dnvgl.com
This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this
document. The use of this document by others than DNV GL is at the user's sole risk. Unless otherwise stated in an applicable contract,
or following from mandatory law, the liability of DNV GL AS, its parent companies and subsidiaries as well as their officers, directors and
employees ("DNV GL") for proved loss or damage arising from or in connection with any act or omission of DNV GL, whether in contract or in
tort (including negligence), shall be limited to direct losses and under any circumstance be limited to 300,000 USD.CURRENT – CHANGES
Part 3 Chapter 6 Changes - current
This document supersedes the July 2019 edition of DNVGL-RU-HSLC Pt.3 Ch.6.
Numbering and/or title of items containing changes are highlighted in red colour.
Changes July 2020, entering into force 1 January 2021
Only editorial corrections have been made.
Editorial corrections
In addition to the above stated changes, editorial corrections may have been made.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 3
Stability, watertight integrity, and closing appliances
DNV GL ASCONTENTS
Part 3 Chapter 6 Contents
Current – changes.................................................................................................. 3
Section 1 General Requirements............................................................................. 6
1 General................................................................................................ 6
1.1 Objective......................................................................................... 6
1.2 Application....................................................................................... 6
1.3 Documentation................................................................................. 6
1.4 Required compliance documentation................................................... 8
Section 2 Stability................................................................................................... 9
1 Inclining and stability information...................................................... 9
1.1 General........................................................................................... 9
2 Intact stability requirements............................................................. 10
3 Ice accretion applicable to all types of craft......................................10
Section 3 Water and weathertight integrity..........................................................11
1 Internal openings, watertight integrity............................................. 11
1.1 General..........................................................................................11
1.2 Operation....................................................................................... 11
1.3 Strength........................................................................................ 11
2 Skirts protecting access to flexibly mounted superstructure and
deckhouses........................................................................................... 12
2.1 General..........................................................................................12
3 External openings for weatherthight integrity................................... 12
3.1 External openings........................................................................... 12
3.2 Weathertight hatches...................................................................... 12
3.3 Weathertight Doors......................................................................... 13
3.4 Machinery space openings............................................................... 14
3.5 Miscellaneous openings in exposed decks...........................................15
3.6 Ventilation Openings........................................................................15
4 Scuppers, inlets and discharges........................................................ 16
4.1 General..........................................................................................16
5 Air pipes............................................................................................ 17
5.1 General..........................................................................................17
6 Freeing ports..................................................................................... 17
6.1 General..........................................................................................17
7 Windows............................................................................................ 18
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 4
Stability, watertight integrity, and closing appliances
DNV GL AS7.1 General..........................................................................................18
Part 3 Chapter 6 Contents
7.2 Window thickness........................................................................... 18
7.3 Direct glazing................................................................................. 20
7.4 Deadlights......................................................................................21
Section 4 Miscellaneous........................................................................................ 22
1 Marking and recording of the design waterline..................................22
2 Protection of the crew and passengers............................................. 22
2.1 General..........................................................................................22
Changes – historic................................................................................................ 23
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 5
Stability, watertight integrity, and closing appliances
DNV GL ASSECTION 1 GENERAL REQUIREMENTS
Part 3 Chapter 6 Section 1
1 General
1.1 Objective
1.1.1 The objective of this chapter is to define requirements related to stability, water and weathertight
integrity and closing appliances.
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
International Code of Safety for High Speed Craft, 2000 (2000 HSC Code) 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
AP
manual
B010 – Lines plan and offset tables FI
B020 – External watertight
FI
integrity plan
Stability
B100 - Inclining test or light
AP,VS
weight survey procedure
B110 - Inclining test or lightweight
AP,VS
survey report
B120 – Final stability manual AP,VS
Doors, ramps, securing devices and locking
C030 – Detailed drawing devices. Including specification of design AP
Shell doors pressure shall.
Z030 - Arrangement plan Bow, stern and side doors. FI
Z030 – Arrangement plan FI
Cargo hatches Including covers and opening, closing, sealing,
C030 – Detailed drawing AP
securing and locking devices.
B200 – Freeboard plan AP
External watertight and Z030 – Arrangement plan FI
weathertight integrity
Doors, hatches, securing devices and locking
C030 – Detailed drawing AP
devices. Design pressure shall be specified.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 6
Stability, watertight integrity, and closing appliances
DNV GL ASObject Documentation type Additional description/required data Info
Part 3 Chapter 6 Section 1
Hatch covers, securing devices and locking
H050 – Structural drawing AP
Service hatchways devices. Design pressure shall be specified.
Z030 - Arrangement plan FI
Doors, securing devices and locking devices.
C030 - Detailed drawing AP
Including specification of design pressure.
Internal watertight
Z030 - Arrangement plan
doors / ramps
I200 - Control and monitoring FI
system documentation
Including glazing material specification, main
dimensions, method of attachment, deadlight
Windows and side C030 – Detailed drawing AP
specification. Including specification of design
scuttles pressure.
Z030 - Arrangement plan FI
AP=For approval; FI=For information
ACO=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 DNVGL-CG-0550
Sec.6.
For a full definition of the documentation types, see DNVGL-CG-0550 Sec.5.
Guidance note:
More details of documentation requirements for the different stability items are given in DNVGL-CG-0157 Stability documentation
for approval.
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1.3.2 For instrumentation and automation, including computer based control and monitoring, see Pt.4 Ch.9
Sec.1.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 7
Stability, watertight integrity, and closing appliances
DNV GL ASPart 3 Chapter 6 Section 1
1.4 Required compliance documentation
1.4.1 Components to be installed on board shall have compliance documents according to Table 2.
Table 2 Compliance documents
Compliance
Compliance
Object document Issued by Additional description
standard*
type
Watertight doors. Type Approval may be accepted
PC Society in lieu of PC in accordance with 2000 HSC Code
Doors 2.2.2.2
TA Society Weathertight doors
Watertight hatches. Type Approval may be
PC Society accepted in lieu of PC in accordance with 2000
Hatches HSC Code 2.2.2.2
TA Society Weathertight hatches, including flush hatches
Windows TA Society Adhesives, see Sec.3 [7.3]
* Unless otherwise specified the compliance standard is the rules.
1.4.2 For general compliance documentation requirements, see DNVGL-CG-0550 Sec.4.
1.4.3 For a definition of the compliance document types, see DNVGL-CG-0550 Sec.3
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 8
Stability, watertight integrity, and closing appliances
DNV GL ASSECTION 2 STABILITY
Part 3 Chapter 6 Section 2
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 limiting
for the vessel’s operation.
1.1.3 The loading conditions shall be within the limit curves and/or shall comply with the required stability
criteria.
1.1.4 If a loading computer is installed for the purpose of determining the craft’s trim and stability, and also
ascertain and record that the craft is in compliance with the stability criteria of the relevant requirements, it
is subject to approval (see DNVGL-RU-SHIP Pt.6 Ch.4 Sec.6).
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 Sec.1 [1.3] and in
the presence 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,
shall not 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 craft
and the lightweight survey of the sister craft, an inclining test may be required for the latter. Alternatively, the difference shall be
positioned 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 survey
may 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 of
the surveyor. This shall be considered as basis for comparison with the result of the lightweight survey, and submitted together
with the 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 the
final 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, shall
be positioned at the most unfavourable position, when calculating the vertical centre of gravity. I.e., any increase to be placed at
the 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 lightweight
estimate 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 stability
manual.
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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Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 9
Stability, watertight integrity, and closing appliances
DNV GL ASPart 3 Chapter 6 Section 2
2 Intact stability requirements
All high speed craft shall comply with the intact stability requirements of 2000 HSC Code 2.2.1, 2.3, 2.4 and
2.5. Intact stability criteria are given in Annex 7 for multihulls and in Annex 8 for monohulls. Hydrofoil boats
shall comply with the requirements outlined in 2000 HSC Code Annex 6.
3 Ice accretion applicable to all types of craft
All types of crafts shall comply with the requirements outlined in 2000 HSC Code Annex 5.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 10
Stability, watertight integrity, and closing appliances
DNV GL ASSECTION 3 WATER AND WEATHERTIGHT INTEGRITY
Part 3 Chapter 6 Section 3
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.1
Sec.2 [1] and in 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 decks
in approved positions. Hinged doors shall not be used where remote control is required. Hinged doors for
passage shall be of quick acting or single acting type.
1.1.4 Sliding doors may be hand operated only, or both power and hand operated. A positive force shall
be required to re-open the doors. Sliding doors shall have an indication (i.e. a red light) placed locally on
both sides of the adjacent structure to show that the door is in the remote control mode. Signboards and
instructions 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 visual
signals on both sides of the door.
1.1.5 Watertight doors shall be provided with indicators on the bridge control station to indicate whether the
doors are open or closed.
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..
1.3 Strength
1.3.1 Watertight doors and hatches shall withstand the design pressure from both sides. The panel thickness
shall 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 they
shall 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:
4
(cm )
d = distance between closing devices in m, to be measured along door edge
pe = pb, packing line pressure along edges, not to be taken less than 5 N/mm
p = design pressure as given in Ch.1 Sec.3 [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.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 11
Stability, watertight integrity, and closing appliances
DNV GL ASThe coaming (door frame) shall be designed with the necessary stiffness in order to avoid large deflections
Part 3 Chapter 6 Section 3
resulting in leakage in the damaged condition.
1.3.3 The stiffness requirements in [1.3.2] may be omitted by performing a structural analysis which shall
include 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:
2
normal stress (N/mm )
2
shear stress (N/mm )
2
equivalent stress (N/mm )
1.3.5 Doors and hatch covers which become immersed by the equilibrium or the intermediate water plane
in a damaged condition shall be subjected to a hydrostatic pressure test. The head of water used for the
pressure test shall correspond at least to the head measured from the lower edge of the door opening, at
the location in which the door shall be fitted in the vessel, to the most unfavourable damage waterplane. The
acceptance 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 improper
closing of the door.
2 Skirts protecting access to flexibly mounted superstructure and
deckhouses
2.1 General
2.1.1 Where access is provided to the hull through flexibly mounted superstructure the weathertight integrity
of the connection between the hull and the superstructure shall be maintained. This connection shall be
2
approved and tested for a pressure of 6 kN/m .
2.1.2 For flexible material used for the connection, the longevity and durability of the material shall be
appropriate 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 the
vessel operation manual.
3 External openings for weatherthight integrity
3.1 External openings
All external openings which may become submerged within the required range of stability shall have
weathertight closing appliances. Small openings through which progressive flooding may not occur need not
be so equipped.
3.2 Weathertight hatches
3.2.1 Weathertight hatches shall be fitted in all external access openings in the weather deck.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 12
Stability, watertight integrity, and closing appliances
DNV GL AS3.2.2 Weathertight hatches shall be of equivalent strength as the surrounding structure and hose-tested
Part 3 Chapter 6 Section 3
after installation.
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
hinges are normally to be located on the fore edge.
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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 considered
access hatches.
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3.2.5 The minimum height of coamings for access hatches with weathertight covers is normally not to be
less than:
— Hatchways on weather deck, giving access to spaces below the weather deck shall have a coaming height
not less than 250 mm.
— Hatchways on weather deck not giving access to spaces below the weather deck and not necessary for the
operation 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 coaming
height 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 accepted
provided:
— 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 flush
escape 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 be
operated 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 and
additional security against impact of the sea.
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Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 13
Stability, watertight integrity, and closing appliances
DNV GL AS3.3.3 Weathertight doors shall as a minimum have the same strength as their surrounding structure and
Part 3 Chapter 6 Section 3
may be made of steel, aluminium or FRP.
3.3.4 Weathertight doors shall be fitted with gasket and a sufficient number of clamping devices. The
gasket shall be protected from mechanical abrasion. The clamping of the door shall be arranged to prevent
overcompression of the gasket. The number of clamping devices shall normally be in accordance with Table
1.
Table 1 Number of clamping devices
Position No.
> 1500 mm 3
Long side
< 1500 mm 2
> 700 mm 1
Short side
< 700 mm 0
Doors with hinges acting as clamping means may be accepted provided the hinges are both adjustable and
designed with circular hinge pin holes.
The hinges shall only be fitted with oval hinge pin holes if separate clamping devices are fitted to the same
edge.
3.3.5 For weathertight doors in companionways and deckhouses on superstructure deck in vessels with
service 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 the
weather 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 the
weather deck and not necessary for the operation of the vessel at sea shall have sill heights of not less than
100 mm. Doors in this position which are necessary for the operation of the vessel at sea shall have sill
heights 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 ample
strength and, where the casings are not protected by other structures, their strength shall be specially
considered. Access openings in such casings shall be fitted with weathertight doors.
(2000 HSC Code 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 weathertight
spaces 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.
(2000 HSC Code 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 to
decks above the weather deck need not be fitted with closing arrangements unless they face forward or are
specifically required by the Society.
(2000 HSC Code 2.2.8.4.2)
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 14
Stability, watertight integrity, and closing appliances
DNV GL ASPart 3 Chapter 6 Section 3
3.5 Miscellaneous openings in exposed decks
3.5.1 Manholes and flush scuttles on the weather deck or within superstructures and deckhouses other than
enclosed superstructures shall be closed by substantial covers capable of being made watertight. Unless
secured by closely spaced bolts, the covers shall be permanently attached.
(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 are
secured by closely spaced bolts, are kept closed at sea, and are equipped with arrangements for portable
guardrails.
(2000 HSC Code 2.2.8.3.2)
3.5.3 Openings in exposed decks leading to spaces below the weather deck or enclosed superstructures
other than hatchways, machinery space openings, manholes and flush scuttles shall be protected by an
enclosed superstructure, or by a deckhouse or companionway of equivalent strength and weathertightness.
(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 the
displacement 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 0.05 L, minimum 2.30 m
R1 0.04 L, minimum 2.00 m
R2 0.035 L, minimum 1.70 m
R3 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 be
considered. 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 with
a coaming above the level of the deck where it is located. The height of this coaming shall be at least 380
mm 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 to
be facing aft or athwartships.
3.6.4 Ventilation openings facing forward shall be fitted with a drainage system preventing water from
entering the opening.
3.6.5 Direct air intakes for machinery shall have a protecting grate and a water trap system.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 15
Stability, watertight integrity, and closing appliances
DNV GL ASPart 3 Chapter 6 Section 3
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 within
superstructures and deckhouses fitted above the weather deck shall be fitted with efficient and accessible
means for preventing water from passing inboard. Normally each separate discharge shall have one
automatic 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 pipe
exceeds 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 that
vertical distance exceeds 0.02L, a single automatic non-return valve without positive means of closing may
be accepted. The means for operating the positive action valve shall be readily accessible and provided with
an indicator showing whether the valve is open or closed.
(2000 HSC Code 2.2.9.1)
4.1.2 Valves on scuppers from weathertight compartments included in the stability calculations shall be
operable from the operating compartment.
(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 operation
of machinery may be controlled locally. Such controls shall be readily accessible and shall be provided
with indicators showing whether the valves are open or closed. In unmanned machinery spaces, main and
auxiliary 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 conditions
above the deepest flooded waterline following damage specified in 2.6.6 to 2.6.10; or
2) be operable from the operating compartment.
(2000 HSC Code 2.2.9.3)
4.1.4
Scuppers leading from superstructures or deckhouses not fitted with weathertight doors shall be
led overboard.
(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. Valves
of ordinary cast iron or similar material shall not be acceptable.
(2000 HSC Code 2.2.9.5)
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 16
Stability, watertight integrity, and closing appliances
DNV GL ASPart 3 Chapter 6 Section 3
5 Air pipes
5.1 General
5.1.1 Main storage tanks containing flammable liquids or tanks which can be pumped or filled from the
sea shall have air pipes which do not terminate in enclosed spaces.
(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 where
water may have access below of at least 300 mm where the deck is less than 0.05L above the design
waterline, and 150 mm on all other decks.
(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 of
at least 0.02L above any waterline when the intact craft is heeled to an angle of 15° or 0.02L above the
highest waterline at all stages of flooding as determined by the damaged stability calculations, whichever
is higher.
(2000 HSC Code 2.2.10.3)
5.1.4 All air pipes shall be equipped with weathertight closing devices that close automatically.
(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 the
decks of water and for draining them. The minimum freeing port area (A) on each side of the craft for each
well 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); and
2) where l exceeds 20 m:
A = 0.07 l (m ),
2
and, in no case, l need be taken as greater than 0.7L.
2
If the bulwark is more than 1.2 m in average height, the required area shall be increased by 0.004 m per
metre of length of well for each 0.1 m difference in height. If the bulwark is less than 0.9 m in average
2
height, the required area shall be decreased by 0.004 m per metre of length of well for each 0.1 m
difference in height.
(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 shall
be within 0.02 m above the deck. 2.2.11.3 All such openings in the bulwarks shall be protected by rails or
bars spaced approximately 230 mm apart. If shutters are fitted to freeing ports, ample clearance shall be
provided to prevent jamming. Hinges shall have pins or bearings of non-corrodible material. If shutters are
fitted with securing appliances, these appliances shall be of approved construction.
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Stability, watertight integrity, and closing appliances
DNV GL AS(2000 HSC Code 2.2.11.2)
Part 3 Chapter 6 Section 3
6.1.3 Craft, having superstructures which are open in front or both ends, shall comply with the provisions of
2.2.11.1.
(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:
2
A = 0.3b (m )
where:
b = the breadth of the craft at the exposed deck (m).
(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 provisions
of 2000 HSC Code 2.2.3.
(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 stiff
aluminium 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 based on
case-by-case consideration.
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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 cross
section 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:
(mm)
b = small dimension of window opening in mm
Kw = 225 for chemically toughened glass (CTG)
= 225 for thermally toughened glass (TTG)
= for thermally toughened glass (TTG)
= 190 for polymethylmethacrylate (PMMA)
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 18
Stability, watertight integrity, and closing appliances
DNV GL AS= 190 for polycarbonate (PC)
Part 3 Chapter 6 Section 3
p = lateral pressure according to Ch.1 Sec.2
ß = 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 notation
Passenger craft, Ferry and Cargo.
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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:
(mm)
i = number of glass layers
ti = 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 are
satisfactorily pressure tested as described in [7.2.3] and [7.2.4].
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 for
toughened glass, and 3.5 times the design pressure for polycarbonate.
7.2.4 During the testing the window shall be fitted in similar arrangement as to be installed onboard the
craft. The testing may be considered satisfactory provided:
— no failure in window or attachment method
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 19
Stability, watertight integrity, and closing appliances
DNV GL AS— no leakages occur.
Part 3 Chapter 6 Section 3
Guidance note:
Large glass doors or windows in the aft end of superstructures or deckhouses will be especially considered.
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7.3 Direct glazing
7.3.1 Window panes may be fastened to the supporting structure by adhesively bonded joints without any
counter frame or mechanical fasteners. However, the weight of the window pane is normally to be carried by
at 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 time
behaviour of the adhesive with respect to retention of adhesive and cohesive strength and elasticity and the
creep properties shall be documented.
7.3.3 The joint width is not to be less than:
(mm)
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 knots
σt = tensile strength for the glue at 12.5% elongation (MPa)
The joint depth (thickness of glue) shall be not less than:
(mm)
tmin = 6 mm, but not less than d/2 for d > 12 mm
k = 1.5 for glass
k = 8.0 for polycarbonate
l = length of longest window side (mm).
For rectangular windows with l/b > 2, mounted with the longest side in the horizontal direction, and with the
lower edge mechanically secured against in-plane movement, l in the formula above shall be substituted by
2b.
7.3.4 Adhesives for direct glazing shall comply with the following minimum requirements:
— 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.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 20
Stability, watertight integrity, and closing appliances
DNV GL ASThe short and long term performance of the adhesion between adhesive and substrate material shall be
Part 3 Chapter 6 Section 3
documented.
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 depending
on 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 1st
100% 100% [7.4.4] 0
tier
Superstructure and deckhouse side 1 st
[7.4.4] 0 0
tier
Superstructure and deckhouse front 2nd
[7.4.4] 0 0
tier and above
Superstructure and deckhouse side 2nd
[7.4.4] 0 0
tier and above
7.4.2 Below the weather deck deadlights shall be permanently mounted and shall have the same strength as
the surrounding structure.
7.4.3 Deadlights above the weather deck, for which there is 100% requirement, shall have the same
strength 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.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 21
Stability, watertight integrity, and closing appliances
DNV GL ASSECTION 4 MISCELLANEOUS
Part 3 Chapter 6 Section 4
1 Marking and recording of the design waterline
Marking and recording of the design waterline and the load line mark shall be in compliance with the 2000
HSC Code 2.9 as applicable.
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 or
passengers have access. Alternative arrangements such as safety harnesses and jack-stays may be accepted
if they provide an equivalent level of safety. The height of the bulwarks or guardrails shall be at least 1m
from the deck, provided that, where this height would interfere with the normal operation of the craft, a
lesser height may be approved.
(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 courses
shall not be more than 380 mm apart. In the case of craft with rounded gunwales, the guardrail supports
shall be placed on the flat of the deck.
(2000 HSC Code 4.11.2)
2.1.3 Satisfactory means (in form of guardrails, lifelines, gangways or under-deck passages, etc.) shall be
provided for the protection of the crew in getting to and from their quarters, the machinery space and all
other parts used in the necessary work of the craft.
(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 cargo
and which gives access to and from the crew’s quarters, the machinery space and all other parts used in
the necessary work of the craft can be properly closed and secured against admission of water. Effective
protection for the crew in the form of guardrails or lifelines shall be provided above the deck cargo if there is
no convenient passage on or below the deck of the craft.
(2000 HSC Code 4.11.4)
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 22
Stability, watertight integrity, and closing appliances
DNV GL ASCHANGES – HISTORIC
Part 3 Chapter 6 Changes – historic
July 2019 edition
Changes July 2019, entering into force 1 January 2020
Only editorial changes have been made.
December 2015 edition
There are currently no historical changes for this document.
Rules for classification: High speed and light craft — DNVGL-RU-HSLC Pt.3 Ch.6. Edition July 2020 Page 23
Stability, watertight integrity, and closing appliances
DNV GL ASAbout DNV GL DNV GL is a global quality assurance and risk management company. Driven by our purpose of safeguarding life, property and the environment, we enable our customers to advance the safety and sustainability of their business. We provide classification, technical assurance, software and independent expert advisory services to the maritime, oil & gas, power and renewables industries. We also provide certification, supply chain and data management services to customers across a wide range of industries. Operating in more than 100 countries, our experts are dedicated to helping customers make the world safer, smarter and greener. SAFER, SMARTER, GREENER
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