Section 1 General
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 4 Ship Structures (Ship Types) - Chapter 3 Pontoons - Section 1 General

Section 1 General

Parent topic: Chapter 3 Pontoons

1.1 Application

1.1.1 This Chapter applies to ships which are generally being towed and/or pushed or carried alongside another ship and to self-propelled ships with machinery aft, intended for the carriage of non-perishable cargo on deck.

1.1.2 The structural requirements of this Chapter are intended to cover the midship region (0,5L), as defined in Pt 3, Ch 3, 2.2 Definition of midship region for ships having a length not exceeding 125 m, a ratio of length to depth not exceeding 35 and a ratio of breadth to depth not exceeding seven.

1.1.3 Arrangements and scantlings forward and aft of the midship region are to comply with Pt 3, Ch 5 Fore End and Aft End Structure and Pt 3, Ch 6 Machinery Spaces so far as applicable, the remaining requirements of Pt 3 Ship Structures (General) are also to be complied with as appropriate to the intended arrangements.

1.1.4 The arrangements are to be as required in Pt 4, Ch 1 Dry Cargo Ships, as far as applicable, or as specified otherwise in this Chapter.

1.2 Structural configuration

1.2.1 This Chapter provides for a basic structural configuration of a single flush deck hull with only small access openings, and with single bottom and single skin side construction.

1.2.2 Longitudinal or transverse framing may be adopted, or a combination thereof. For ships over 50 m in length, it is recommended that a longitudinal framing system in bottom and deck be used.

1.2.3 The number and disposition of transverse bulkheads are to be as required by Pt 3, Ch 7 Bulkheads but additional transverse bulkheads may have to be fitted to provide for sufficient transverse strength of the ship. It is recommended that longitudinal bulkheads be fitted to support the bottom and deck structure

1.3 Class notation

1.3.1 Ships complying with the requirements of this Chapter will be eligible to be classed:

‘A1 I.W.W. pontoon’, or
‘A1 I.W.W. pontoon, self propelled'.

1.3.2 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.

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

1.4 Information required

1.4.1 For the information required, see Pt 3, Ch 1, 5 Information required. In addition the following are to be supplied:

  1. Details of cargo loading on deck, see Pt 3, Ch 3, 4 Design loading.

  2. The maximum pressure head in service on tanks.

  3. Details of tanks which will be solely used for water ballast.

  4. Details of wheeled vehicles, when used for loading/ unloading of the cargo.

1.5 Symbols and definitions

1.5.1 The following symbols and definitions are applicable to this Chapter unless otherwise stated:

L, B, D and T are as defined in Pt 3, Ch 1, 6.1 Principal particulars

kL is given in Table 2.1.1 Values of KL

k =

higher tensile steel factor, see Pt 3, Ch 2, 1.3 Steel 1.3.3
l = overall length of stiffening member, in metres, see Pt 3, Ch 3, 3.2 Geometric properties of section
l e = effective length of stiffening member, in metres, see Pt 3, Ch 3, 3.3 Determination of span point
s = spacing of secondary stiffeners, i.e. frames, beams or stiffeners, in metres
t = thickness of plating, in mm
I = inertia of stiffening member, in cm4, see Pt 3, Ch 3, 3.2 Geometric properties of section
S = spacing, or mean spacing, of primary members, i.e. girders, transverses, webs, etc. in metres
Z = section modulus of stiffening member, in cm3, see Pt 3, Ch 3, 3.2 Geometric properties of section.
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