9.1.3 The minimum hull modulus in way of turret areas and other large openings
is to satisfy the Rule requirements for longitudinal strength. When the turret is
situated within 0,5L amidships, the minimum hull midship section modulus
about the transverse neutral axis at deck or keel is to be maintained in way of the
turret opening. Increases in plate thicknesses are to take place gradually. Any
reduction in hull section modulus should be kept to a minimum and compensation
fitted where necessary.
9.1.4 For a turret-moored unit with a turret well opening, suitable
precautions are to be taken to prevent damage to the well structure in transit and
when disconnected, when applicable.
9.1.5 The hull structure in way of mooring connections is to be verified by
direct calculation. In all cases, the structural analysis is to include a
representative portion of the hull and tank structure, together with the integration
of the mooring system with the unit's structure. The analysis is to be in accordance
with the LR ShipRight Procedure for Ship Units and Pt 4, Ch 5 Primary Hull Strength, as applicable.
9.1.6 Continuity of primary structural elements is to be maintained as far as
practicable in way of turret openings and mooring support structure.
9.1.7 Turret bearings are to comply with Pt 3, Ch 2 Drilling Units. The turret bearing support structure is to be
integrated into the hull structure.