Cargo Containment
Clasification Society 2024 - Version 9.40
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 - The Rules and Regulations for the Construction and Classification of Liquid Chemicals in Bulk - Cargo Containment

Cargo Containment

Parent topic: The Rules and Regulations for the Construction and Classification of Liquid Chemicals in Bulk

4.1 Definitions

4.1.1  Independent tank means a cargo-containment envelope, which is not contiguous with, or part of, the hull structure. An independent tank is built and installed so as to eliminate whenever possible (or in any event to minimize) its stressing as a result of stressing or motion of the adjacent hull structure. An independent tank is not essential to the structural completeness of the ship's hull.

4.1.2  Integral tank means a cargo-containment envelope which forms part of the ship's hull and which may be stressed in the same manner and by the same loads which stress the contiguous hull structure and which is normally essential to the structural completeness of the ship's hull.

4.1.3  Gravity tank means a tank having a design pressure not greater than 0.07 MPa gauge at the top of the tank. A gravity tank may be independent or integral. A gravity tank shall be constructed and tested according to recognized standards, taking account of the temperature of carriage and relative density of the cargo.

4.1.4  Pressure tank means a tank having a design pressure greater than 0.07 MPa gauge. A pressure tank shall be an independent tank and shall be of a configuration permitting the application of pressure-vessel design criteria according to recognized standards.

LR 4.1(a) Integral tank scantlings and arrangements

LR 4.1(a).1 Integral cargo tank scantlings and arrangements are to be in accordance with Chapter LR V.

LR 4.1(b) Independent tank scantlings and arrangements

LR 4.1(b).1 The scantlings and arrangements will be considered on the basis of the standards contained in the Rules for Ships for Liquefied Gases, taking account of the cargo relative densities.

LR 4.1(b).2 Consideration is to be given to the maximum pressure which will be encountered in service and account is to be taken of the dynamic loading which will be experienced by the tanks, supports and keys. Calculations are to be submitted to enable the appraisal of the proposed arrangements.

LR 4.1(b).3 Where it is intended to carry high temperature cargoes, the tanks are to be supported and keyed so as to permit free expansion in all directions and eliminate heat bridges which may transmit thermal stresses to the hull of the ship.

LR 4.1(b).4 All openings should be in the top of the tank and extended above the deck. Access is to be from the open deck direct with arrangements for maintaining watertightness at the joint between the hatch coaming and the deck.

4.2 Tank type requirements for individual products

4.2.1 Requirements for both installation and design of tank types for individual products are shown in column f in the table of chapter 17.

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