Section 1 General

1.1.1 This Chapter applies to propelled and non-propelled tankers of Type G, C and N intended for the carriage of dangerous liquids in bulk.

1.1.2 Most of the definitions hereunder have been derived from Part 1 of the ADN. Only the ADN definitions relevant to this Chapter have been included. A number of ADN definitions have been reworded. For a complete overview of all ADN definitions, reference is made to Part 1 of the ADN:

1.1.3  Accommodation means spaces intended for the use of persons normally living on board, including galleys, food stores, lavatories, washrooms, bathrooms, laundries, halls, alleyways, etc. but excluding the wheelhouse.

1.1.4  Cargo area means the whole of the following spaces (see Figure 4.1.1 Above deck cargo area for various tank vessels);

1.1.5  Cargo area (additional part above deck) (when antiexplosion protection is required, comparable to zone 1) means the spaces not included in the main part of cargo area above deck comprising 1,00 m radius spherical segments centred over the ventilation openings of the cofferdams and the service spaces located in the cargo area part below the deck and 2,00 m spherical segments centred over the ventilation openings of the cargo tanks and the opening of the pump rooms;

1.1.6  Cargo area (main part above deck) (when anti-explosion protection is required – comparable to zone 1) means the space which is bounded:

• at the sides, by the shell plating extending upwards from the deck’s sides;
• fore and aft, by planes inclined at 45° towards the cargo area, starting at the boundary of the cargo area part below deck;
• vertically, 3,00 m above the deck;

1.1.7  Cargo area (part below deck) means the space between two vertical planes perpendicular to the centre-line plane of the vessel, which comprises cargo tanks, hold spaces, cofferdams, double-hull spaces and double bottoms; these planes normally coincide with the outer cofferdam bulkheads or hold end bulkheads. Their intersection line with the deck is referred to as the boundary of the cargo area part below deck;

1.1.8  Cargo tank (when anti-explosion protection is required, comparable to zone 0) means a tank intended for the carriage of dangerous or non-dangerous liquids. The cargo tank can either be integral with the hull structure of the ship or can consist of a separate tank independent from the ship’s hull.

1.1.9  Cargo tank (open or closed type). The following basic types of cargo tanks can be discerned:

• ‘Open type’ cargo tanks are tanks in which the cargo is carried at atmospheric pressure by means of a ventilation system open to the air.
• ‘Closed type’ cargo tanks are tanks in which the cargo is shut-off from the open air during carriage and which are protected against overpressure and unacceptable vacuum.

1.1.10  Classification of zones (see IEC publication 79-10, the European Standard laying down Technical Requirements for Inland Navigation vessels (ES-TRIN)):

• Zone 0: areas in which dangerous explosive atmospheres of gases, vapours or sprays exist permanently or during long periods;
• Zone 1: areas in which dangerous explosive atmospheres of gases, vapours or sprays are likely to occur occasionally;
• Zone 2: areas in which dangerous explosive atmospheres of gases, vapours or sprays are likely to occur rarely and, if so, for short periods only.

1.1.11  Cofferdam (when anti-explosion protection is required, comparable to zone 1) means an athwartship compartment which is bounded by watertight bulkheads and which can be inspected. The cofferdam shall extend over the whole area of the end bulkheads of the cargo tanks. The bulkhead not facing the cargo area shall extend from one side of the vessel to the other and from the bottom to the deck in one frame plane.

1.1.12  Flash-point means the lowest temperature of a liquid at which its vapours form a flammable mixture with air.

1.1.13  Identification number means the number for identifying a substance to which no UN number has been assigned or which cannot be classified under a collective entry with a UN number. These numbers have four figures beginning with 9.

1.1.14  Maximum working pressure means the maximum pressure occurring in a cargo tank or a residual cargo tank during operation. This pressure equals the opening pressure of high velocity vent valves.

1.1.15  Opening pressure means the pressure referred to in a list of substances at which the high velocity vent valves open.

1.1.16  Packing group means a group to which, for packing purposes, certain substances may be assigned in accordance with their degree of danger. The packing groups have the following meanings which are explained more fully in Part 2 of the ADN:

• Packing group I: Substances presenting high danger;
• Packing group II: Substances presenting medium danger; and
• Packing group III: Substances presenting a lower danger.

1.1.17  Pressures. For tanks, all kinds of pressures (e.g. working pressure, opening pressure of the high velocity vent valves, test pressure) shall be expressed as gauge pressures in kPa (bar); the vapour pressure of substances, however, shall be expressed as an absolute pressure in kPa (bar).

1.1.18  Pressure tank means a tank designated and approved for a working pressure > 400 kPa (4 bar).

1.1.19  Tanker. A ship which has been specially designed and constructed for the carriage of liquids or gases in bulk.

1.1.20  Test pressure means the pressure at which a cargo tank, a residual cargo tank, a cofferdam or the loading and unloading pipes shall be tested prior to being brought into service for the first time and subsequently regularly within prescribed times.

1.1.21  UN number means the four-figure identification number of the substance or article taken from the United Nations Model Regulations.

Figure 4.1.1 Above deck cargo area for various tank vessels

1.2.1 The requirements of Lloyd’s Register’s (hereinafter referred to as LR) Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 (hereinafter referred to as the Rules for Inland Waterways Ships) intended for the carriage of dangerous liquids in bulk are based on the following international regulations:

• The United Nations’ ADN regulations:
  The European Agreement concerning the International Carriage of Dangerous Goods by River.

1.2.2 The exemptions and derogations to the ADN, as authorised by the UNECE (United Nations Economic Commision for Europe) - Experts on ADN, may also be taken into consideration.

1.2.3 The structural and other arrangements of tankers for the carriage of dangerous liquids in bulk, to be registered in, or to operate in countries with Regulations differing from ADN will receive appropriate special consideration if required by the relevant Authorities and/or desired by the Owner.

1.2.4 Although the contents of this Chapter take the ADN Regulations into account, the issue of an ADN Certificate on behalf of the Relevant Authorities requires full compliance with their Regulations.

1.2.5 Special attention is drawn to National and International technical and operational requirements of countries where the ship is registered or operating, which are outside classification as defined in the Rules and Regulations.

1.2.6 Electronic copies of the ADN can be downloaded from the site of the United Nations Economic Commission for Europe at
http://www.unece.org/publications/transport/dg_adn. html

1.3.1 Dangerous liquids are those liquids which according to the recommendations of the United Nations Committee of Experts on Transport of Dangerous Goods, and according to the provisions of the ADN belong to the following classes:

• Class 2 Gases; compressed, liquefied or dissolved under pressure.
• Class 3 Flammable liquids.
• Class 6.1 Poisonous (toxic) liquids.
• Class 8 Corrosive liquids.
• Class 9 Liquids having a potential hazard during transport not described in the above categories.

1.3.2 For further details of the Classification of dangerous gases and liquids, the assigment of UN numbers, and the designation of Packing groups in relation to the Classes of liquids, reference is made to Part 2 of the ADN.

1.3.3 All dangerous goods entries are listed in Table A of Chapter 3.2 of the ADN in the numerical order of their UN Number. This table contains relevant information on the goods listed, such as name, class, packing group(s), label(s) to be affixed, packing and carriage provisions.

1.3.4 An alphabetical list of the entries mentioned in Pt 4, Ch 4, 1.3 Dangerous liquids 1.3.3 can be found in Chapter 3.2, Table B of the ADN.

1.3.5 Only those substances entered in Table C of Part 3 of the ADN are allowed to be carried in Tankers of Type G, C or N, see also Pt 4, Ch 4, 1.3 Dangerous liquids 1.3.6.

1.3.6 The competent National Authority can, based on procedures by the United Nations Economic Commission for Europe, as laid down in the ADN, allow the transport of substances which have not yet been entered in Table C of Part 3 of the ADN. The resulting special permit as issued will be valid on all applicable rivers without any State or geographical limit, in compliance with the requirements as laid down in the special permit. The special permit will be valid for a maximum period of two years, which can be prolonged with a maximum period of one year after approval by the United Nations Economic Commission for Europe. For further procedures reference is made to Part 1, Section 1.5 of the ADN.

1.3.7 Attention is also drawn to the required compatibility of the cargo with the structural components of the ship, see Pt 4, Ch 4, 1.5 Designation of dangerous liquids to ship types 1.5.3.

1.4.1 For carriage of dangerous liquids of Classes 2, 3, 8 and 9, tankers are divided into the Types G, C and N.

The sketches shown in Figure 4.1.2 Examples of possible hull configurations for Tankers of the Types G. C and N are examples of possible hull configurations for Tankers of Types G, C and N respectively.

Figure 4.1.2 Examples of possible hull configurations for Tankers of the Types G. C and N

1.5.1 Dangerous liquids, carried in bulk are to be transported in tankers of the open or closed type having generally basic cross sections as in Figure 4.1.2 Examples of possible hull configurations for Tankers of the Types G. C and N depending on the class, classification code, packing group and properties of the liquid.

Non-dangerous liquids carried in bulk, are generally transported in an open type tanker having one of the basic cross-sections as for Type N tankers, see also Figure 4.1.2 Examples of possible hull configurations for Tankers of the Types G. C and N.

1.5.2 All additional requirements for the particular substance as contained in Table C of Part 3 of the ADN are to be complied with by the particular Tanker before a substance is allowed to be carried. This also includes any additional requirements contained in column 20 of Table C. An approved list of defined cargoes is to be carried on board.

1.5.3 In addition to the requirements of Pt 4, Ch 4, 1.3 Dangerous liquids 1.3.5 and Pt 4, Ch 4, 1.3 Dangerous liquids 1.3.6, any substance is only allowed to be carried when the compatibility of the cargo with the material used in the construction of the cargo tanks of the ship has been taken into account and has been proven satisfactory.

1.5.4 After commissioning of the ship the owner is to ensure that all components used in the cargo system remain compatible with the products as mentioned in the List of Defined Chemical Cargoes.

1.6.1 Ships complying with the applicable arrangements and requirements of this Chapter and of the appropriate ship type Chapter will be eligible to be classed ‘A1 I.W.W.’ with further notations as indicated in the relevant ship type Chapter.

1.6.2 The Regulations for classification and assignment of class notations are given in Pt 1, Ch 2 Classification Regulations, to which reference should be made on the survey request form.

1.6.3 Where a ship has been specially designed, modified and/or arranged in accordance with the additional requirements for Zones 1 or 2, for service extension, for any special loading or discharging sequence or for navigation in ice, the appropriate class notation will be assigned.

1.7.1 The intact or damage stability of tankers of Type G, C or N is to be in accordance with recognized international stability requirements such as laid down in the ADN. The stability calculations are to be approved by the competent National Authority. At the request of the Owner or builder and as delegated by the Competent National Authority LR can also issue a Statement of Compliance with specific national or international stability requirements.