Section 9 Construction of cargo tanks independent from the ship’s structure
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 6 Tankers of Types C and N - Section 9 Construction of cargo tanks independent from the ship’s structure

Section 9 Construction of cargo tanks independent from the ship’s structure

Parent topic: Chapter 6 Tankers of Types C and N

9.1 General

9.1.1 This Section covers the arrangements and requirements for independent and semi-independent cargo tanks which are designated as: Tanks of open or closed type for the carriage of nondangerous liquids and of dangerous liquids of Class 3, 6.1, 8 and 9.

9.1.2 For a possible restriction of the capacity of tanks, see Pt 4, Ch 4, 3 Ship Arrangements.

9.1.3 If cargo is to be discharged under pressure, the tanks are regarded as pressure tanks.

9.2 Structural requirements

9.2.1 Pressure tanks are to comply with the requirements for pressure vessels, see Ship Type in Pt 4, Ch 5 Tankers of Type G.

9.2.2 Tanks of open or closed type may have plane or corrugated bulkheads and be constructed with stiffening fitted internally or externally, or a combination of the two.

9.2.3 The scantlings and arrangements of open and closed type tanks are to be in accordance with Pt 4, Ch 6, 7 Longitudinal and transverse bulkheads of integral cargo tanks. However, when the tanks are of the semi-independent type (see Figure 4.1.2 Examples of possible hull configurations for Tankers of the Types G. C and N in Chapter 4) the scantlings of the top of the tanks are to be in accordance with the second part of Pt 4, Ch 6, 8.3 Topside structure 8.3.1.

9.2.4 The section modulus of stiffening members of wash bulkheads, if fitted, may be 50 per cent of that required for boundary bulkheads in the same position. The ends of stiffeners may be unattached except those which support girders or longitudinal stiffeners of the tank boundary.

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