RULES FOR CLASSIFICATION - Inland navigation vessels
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RULES FOR CLASSIFICATION
Inland navigation vessels
Edition August 2021
Part 3 Structures, equipment
Chapter 1 Hull design and construction,
general
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DNV ASFOREWORD DNV 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 AS August 2021 Any comments may be sent by e-mail to rules@dnv.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 other parties than DNV is at the user's sole risk. Unless otherwise stated in an applicable contract, or following from mandatory law, the liability of DNV AS, its parent companies and subsidiaries as well as their officers, directors and employees (“DNV”) for proved loss or damage arising from or in connection with any act or omission of DNV, whether in contract or in tort (including negligence), shall be limited to direct losses and under any circumstance be limited to 300,000 USD.
CHANGES – CURRENT
Part 3 Chapter 1 Changes - current
This document supersedes the December 2015 edition of DNVGL-RU-INV Pt.3 Ch.1.
The numbering and/or title of items containing changes is highlighted in red.
Changes August 2021, entering into force 1 January 2022
Topic Reference Description
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other documents in the DNV portfolio. Some of the documents
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Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 3
Hull design and construction, general
DNV ASCONTENTS
Part 3 Chapter 1 Contents
Changes – current.................................................................................................. 3
Section 1 General.................................................................................................... 5
1 Symbols and definitions...................................................................... 5
2 Application........................................................................................... 8
Section 2 Documentation...................................................................................... 10
1 Documentation requirements.............................................................10
Changes – historic................................................................................................ 13
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 4
Hull design and construction, general
DNV ASSECTION 1 GENERAL
Part 3 Chapter 1 Section 1
1 Symbols and definitions
1.1 Symbols and units
1.1.1 Symbols
L = rule length [m], defined in [1.2.1]
B = breadth [m], defined in [1.2.2]
D = depth [m], defined in [1.2.3]
T = draught [m], defined in [1.2.4]
Δ = displacement [t] at draught T
CB = block coefficient
=
1.1.2 Units
Unless otherwise specified, the units used in the rules are as indicated in Table 1.
1.2 Definitions
1.2.1 Rule length
The rule length L is the distance [m] measured on the load waterline from the forward side of the stem to the
after side of the rudder post, or to the centre of the rudder stock where there is no rudder post. L shall be
not less than 96% and need not exceed 97% of the extreme length on the load waterline.
In the case of vessels having neither a rudder post (e.g. vessels fitted with azimuth thrusters) nor a rudder
(e.g. pushed barges) the Rule length L shall be taken equal to the length of the load waterline.
In vessels with unusual stem or stern arrangements, the Rule length L shall be considered on a case-by-case
basis.
1.2.2 Breadth
The breadth B is the greatest moulded breadth, measured amidships below the weather deck.
1.2.3 Depth
The depth D is the distance [m] measured vertically on the midship transverse section, from the base line to
the top of the deck beam at side on the uppermost continuous deck.
Table 1 Units
Designation Usual Symbol Units
Vessel’s dimensions See [1.1.1] m
3
Hull girder section modulus Z cm
3
Density ρ t/m
Concentrated loads P kN
Linearly distributed loads q kN/m
2
Surface distributed loads (pressure) p kN/m
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 5
Hull design and construction, general
DNV ASDesignation Usual Symbol Units
Part 3 Chapter 1 Section 1
Thickness t mm
Span of ordinary stiffeners and primary supporting members ℓ m
Spacing of ordinary stiffeners and primary supporting members s, S m
Bending moment M kNm
2
Stresses σ, N/mm
3
Section modulus of ordinary stiffeners and primary supporting members w cm
2
Sectional area of ordinary stiffeners and primary supporting members A cm
Vessel speed V km/h
1.2.4 Draught
The draught T is the distance [m] measured vertically on the midship transverse section, from the base line
to the load waterline.
1.2.5 Ends of rule length and midship
The fore end (FE) of the rule length L, see Figure 1, is the perpendicular to the load waterline at the forward
side of the stem.
The aft end (AE) of the rule length L, see Figure 1, is the perpendicular to the waterline at a distance L aft of
the fore end.
The midship is the perpendicular to the waterline at a distance 0.5 L aft of the fore end.
Figure 1 Ends of rule length and midship
1.2.6 Superstructure
A superstructure is a decked structure connected to the strength deck defined in [1.2.8], extending from side
to side of the vessel or with the side plating not being inboard of the shell plating by more than 0.04 B.
1.2.7 Deckhouse
A deckhouse is a decked structure other than a superstructure, located on the strength deck defined in
[1.2.8] or above.
1.2.8 Strength deck
The strength deck (main deck) is the uppermost continuous deck contributing to the hull girder longitudinal
strength.
1.2.9 Weather deck
The weather deck is the uppermost continuous exposed deck.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 6
Hull design and construction, general
DNV AS1.2.10 Bulkhead deck
Part 3 Chapter 1 Section 1
The bulkhead deck is the uppermost deck up to which the transverse watertight bulkheads and the shell are
carried.
1.3 Vessel parts
1.3.1 General
For the purpose of application of the rules, the vessel is considered as being divided into the following four
parts:
— fore part
— central part
— machinery space, where applicable
— aft part.
1.3.2 Fore part
The fore part includes the structures of the stems and those:
— located in the part before the cargo zone in the case of vessels with a separated cargo zone (separated by
bulkheads)
— located in the part extending over 0.1 L behind the stem in all other cases unless otherwise mentioned.
1.3.3 Central part
The central part includes the structures within the greater of:
— the region extending over 0.5 L through the midship section
— the region located between the fore part and:
— the machinery space, if located aft
— the aft part, otherwise.
1.3.4 Aft part
The aft part includes the structures located aft of the after peak bulkhead.
1.4 Reference co-ordinate system
1.4.1 The vessel’s geometry and loads are defined with respect to the following right-hand co-ordinate
system (see Figure 2)
— Origin: at the intersection among the longitudinal plane of symmetry of vessel, the aft end of L and the
baseline
— X axis: longitudinal axis, positive forwards
— Y axis: transverse axis, positive towards portside
— Z axis: vertical axis, positive upwards.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 7
Hull design and construction, general
DNV ASPart 3 Chapter 1 Section 1
Figure 2 Reference coordinate system
1.4.2 Positive rotations are oriented in anti-clockwise direction about the X, Y and Z axes.
2 Application
2.1 Structural requirements
2.1.1 These rules contain the requirements for determination of the minimum scantlings, applicable to
all types of inland waterway displacement vessels, up to 135 m in length, of normal form, speed and
proportions, made in welded steel construction.
2.1.2 The requirements of these rules apply also to those steel vessels in which parts of the hull, e.g.
superstructures or movable decks, are built in aluminium alloys.
2.1.3 Vessels with length exceeding 135 m, vessels whose hull materials are different than those mentioned
in [2.1.1] and [2.1.2] and vessels with novel features or unusual hull design shall be individually considered
by the Society, on the basis of the principles and criteria adopted in the rules.
2.1.4 High speed craft shall comply with RU HSLC.
Where the vessel speed exceeds 40 km/h, the respective guidelines defined by Statutory Regulations shall be
considered.
2.2 Limits of application to lifting appliances
2.2.1 The fixed parts of lifting appliances, considered as an integral part of the hull, are the structures
permanently connected by welding to the vessel’s hull (for instance crane pedestals, masts, king posts,
derrick heel seatings, etc., excluding cranes, derrick booms, ropes, rigging accessories, and, generally, any
dismountable parts). The shrouds of masts embedded in the vessel’s structure are considered as fixed parts.
2.2.2 The rules apply to the fixed parts of lifting appliances and their connections to the vessel’s structure,
even when the certification of lifting appliances is not required.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 8
Hull design and construction, general
DNV ASPart 3 Chapter 1 Section 1
2.3 Rules applicable to various vessel parts
The various chapters and sections of the rules shall be applied for the scantlings of vessel parts according to
Table 2.
2.4 Rules applicable to other vessel items
The various chapters and sections of the rules shall be applied for the scantlings of other vessel items
according to Table 3.
Table 2 Rules applicable for the scantling of vessel parts
Applicable chapter and section
Part
General Specific
Fore part Ch.5 Sec.1
Ch.3
Central part
Ch.4
L ≥ 40 m Ch.2
Ch.3 Pt.5 and Pt.6
Ch.6
Central part Ch.4 Sec.6
L < 40 m Pt.5 and Pt.6
Aft part Ch.5 Sec.2
Table 3 Rules applicable for the scantling of other items
Item Applicable section
Machinery space Ch.5 Sec.3
Superstructures and deckhouses Ch.5 Sec.4
Hatch covers Ch.5 Sec.5
Movable decks and ramps Ch.5 Sec.6
Arrangement for hull and superstructure openings Ch.5 Sec.7
Rudders Ch.6 Sec.1
Other hull outfitting Ch.6
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 9
Hull design and construction, general
DNV ASSECTION 2 DOCUMENTATION
Part 3 Chapter 1 Section 2
1 Documentation requirements
1.1 Documentation to be submitted for approval
1.1.1 The plans and documents to be submitted to the Society for review/approval are listed in Table 1.
These shall be supplemented by further documentation which depends on the type and service notation and,
possibly, the additional Class Notation assigned to the vessel.
Structural plans shall show details of connections of the various parts and, in general, shall specify the
materials used, including their manufacturing processes, welding procedures and heat treatments.
1.1.2 The Society reserves the right to ask for further documents and drawings considered necessary.
Irrespective of this, the rules of construction also apply to components and details not shown in the
submitted drawings.
1.1.3 Any deviation from reviewed/approved drawings is subject to the Society’s approval before work is
commenced.
1.1.4 The application of the Society’s rules does not exclude any patent claims.
1.2 Documentation to be submitted for information
1.2.1 In addition to those in [1.1.1], the following plans and documents shall be submitted to the Society for
information:
— general arrangement
— capacity plan, indicating the volume and position of the centre of gravity of all compartments and tanks
— lines plan
— hydrostatic curves
— lightweight distribution.
1.2.2 In addition, when direct calculation analyses are carried out by the designer according to the rules
requirements, they shall be submitted to the Society.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 10
Hull design and construction, general
DNV ASTable 1 Plans and documents to be submitted for approval for all vessels
Part 3 Chapter 1 Section 2
Plan or document Containing also information on
Class characteristics
Main dimensions
Maximum draught
Block coefficient for the length between perpendiculars at the
maximum draught
Midship section Frame spacing
Transverse sections Contractual service speed
Longitudinal sections Density of cargoes
Shell expansion Setting pressure of safety relief valves, if any
Decks and profiles Assumed loading and unloading procedure
Double bottom Design loads on decks and double bottom
Pillar arrangements Steel grades
Framing plan Location and height of air vent outlets of various compartments
Corrosion protection
Openings in decks and shell and relevant compensations
Boundaries of flat areas in bottom and sides
Details of structural reinforcements and/or discontinuities
Details related to welding
Watertight subdivision bulkheads
Openings and their closing appliances, if any
Watertight tunnels
Fore part structure Location and height of air vent outlets of various compartments
Transverse thruster, if any, general arrangement, tunnel
structure, connections of thruster with tunnel and hull
structures
Aft part structure Location and height of air vent outlets of various compartments
Type, power and r.p.m. of propulsion machinery
Machinery space structures
Mass and centre of gravity of machinery and boilers, if any
Foundations of propulsion machinery
Mass of liquids contained in the engine room
Superstructures and deckhouses Extension and mechanical properties of the aluminium alloy
Machinery space casing used (where applicable)
Design loads on hatch covers
Sealing and securing arrangements, type and position of
Hatch covers, if any locking bolts
Distance of hatch covers from the load waterline and from the
fore end
Movable decks and ramps, if any
Windows and side scuttles, arrangements and details
Scuppers and sanitary discharges
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 11
Hull design and construction, general
DNV ASPlan or document Containing also information on
Part 3 Chapter 1 Section 2
Arrangement and dimensions of bulwarks and freeing ports on
Bulwarks and freeing ports
the main deck and superstructure deck
1
Rudder Maximum ahead service speed
Sternframe or sternpost, sterntube
1
Propeller shaft boss and brackets
Hawse pipes
Plan of outer doors and hatchways
Plan of manholes
Plan of access to and escape from spaces
Plan of ventilation Use of spaces
Manoeuvring devices
Plan of watertight doors and scheme of relevant
Electrical diagrams of power control and position indication
manoeuvring devices
circuits
List of equipment
Construction and breaking load of steel wires
Equipment
Material, construction, breaking load and relevant elongation of
synthetic ropes
1) Where other steering or propulsion systems are adopted (e.g. steering nozzles or azimuth propulsion systems), the
plans showing the relevant arrangement and structural scantlings shall be submitted.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 12
Hull design and construction, general
DNV ASCHANGES – HISTORIC
Part 3 Chapter 1 Changes – historic
December 2015 edition
This is a new document.
The rules enter into force 1 July 2016.
Rules for classification: Inland navigation vessels — DNV-RU-INV Pt.3 Ch.1. Edition August 2021 Page 13
Hull design and construction, general
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