LR V.1 General
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Clasifications Register Rules and Regulations - Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquid Chemicals in Bulk, July 2022 - LR V Structural Arrangements and Scantlings - LR V.1 General

LR V.1 General

LR V.1.1 Application

LR V.1.1.1 The requirements of Pt 4, Ch 9 Double Hull Oil Tankers* or Pt 4, Ch 10 Single Hull Oil Tankers* of the Rules for Ships as applicable are to be applied to chemical tankers, except as required by the provisions of this Chapter. Particular attention is drawn to the minimum thickness requirements of Pt 4, Ch 9, 10.2 Compartment minimum thickness*.

LR V.1.1.2 References marked * refer to the Rules for Ships.

LR V.1.2 General definitions and symbols

LR V.1.2.1 The following symbols, used in these Rules, are fully defined in Pt 3, Ch 1, 6 Definitions*:

L = length of ship, in metres
B = moulded breadth of ship, in metres
D = moulded depth of ship, in metres
T = moulded draught of ship, in metres.

LR V.1.2.2 The following symbols are also used in this Chapter. Where these symbols are used in a different or more limited sense, with or without a distinguishing subscript, the amended definition is given at the head of the Section concerned.

h = the load height applied to the item under consideration, in metres
I = the moment of inertia, in cm4, of a primary or secondary member in association with an effective width of attached plating, determined in accordance with Pt 3, Ch 3, 3 Structural idealisation*
L 1 = length of ship, in metres, but need not be taken greater than 190 m
p v = pressure/vacuum relief valve positive setting, not to be taken less than 0,2 bar gauge
S = span, in metres, of the primary or secondary member measured between effective span points. For the determination of span points, see Pt 3, Ch 3, 3 Structural idealisation*
s = spacing of secondary members, in mm
t = thickness of plating, in mm
z = the section modulus, in cm3 of the primary or secondary member, in association with an effective width of attached plating determined in accordance with Pt 3, Ch 3, 3 Structural idealisation*
Z B = actual hull section modulus at the keel, in cm3, as determined in accordance with Pt 3, Ch 3, 3 Structural idealisation*
Z R = Rule hull section modulus, in cm3, as determined from Pt 3, Ch 4, 5 Hull bending strength*
ρ = relative density of cargo, but not to be taken less than 1,025

LR V.1.2.3 The expression ‘primary member’ as used in this Chapter is defined as a girder, transverse, vertical web, stringer, cross tie, buttress or double bottom floor. ‘Secondary members’ are supporting members other than primary members.


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