SOLIDOS

This is a structural calculation of a structural repair to be made on the column “E” pontoon tanks E2 and E4 at Noble Therald Martin. Because an error on the operation of the replenishment the structure was damaged, the intention is to substitute some structural parts that suffered an elevate deformation.

Was made a scanning 3D to take correct measures of deformation, the model resulted from the scanner was used on this memory calculation to indicate what parts we need to substitute. The documents sent for us by client define the material fabrication of this structure is A52 quality B (STANDARD AFNOR), it is compatible with ASTM: A 414Gr.F,G/ A 455I,II/ A 515Gr.70/ A 537Gr.I. We will use for the new parts the ABS AH 36 steel, all calculation were made taking in account the characteristics of this material.

It is important to relate that the operation of this repair is very dangerous and surrounds some welds in the complex structure of the tank, and an inspection of welds is necessary for all perimeter of the bulkhead and for all new parts installed (visual inspection and magnetic particle inspection are necessary as indicate in the figure

2 REFERENCE:

2.1 REPORT NO. RE-NB05-41012-001 REV. 0 – TECHNICAL REPORT

2.2 DRAWING NO. V390329-81-S-105-1 REV A – FLOTTEURS “A E-C PLAFOND RENFORTS DE PILE

2.3 DRAWING NO. V390413-01 – FLOTTEURS – ENSEMBLE DE LA STRUCTURE

2.4 DRAWING NO. V390414-01 – FLOTTEURS – PLAN D’ENSEMBLE

3 DESIGN CRITERIA

The design criteria adopted was the “MODU 3.2.1/3.3”.

“The primary structure of the unit is to be analyzed using the loading conditions stipulated below and the resultant stresses are to be determined. To determine critical cases, conditions representative of all modes of operation are to be considered. Calculations for critical conditions are to be submitted for review. The analysis is to be performed using recognized calculation methods and is to be fully documented and referenced. For each loading condition considered, the following stresses are to be determined, and are not to exceed the allowable stresses given in 3-2-1/3.

i) Stresses due to static loadings only, where the static loads include operational gravity loadings and weight of the unit, with the unit afloat or resting on the sea bed in calm water.

ii) Stresses due to combined loadings, where the applicable static loads in i) are combined with relevant environmental loadings, including acceleration and heeling forces.”

“Individual stress components and, as applicable, direct combinations of such stresses are not to exceed the allowable stress F, as obtained from the following equation. F = Fy /F.S.

Where:

Fy = specified minimum yield point or yield strength, as defined in Chapter 1 of the ABS Rules for Materials and Welding (Part 2).

F.S. = factor of safety

for static loadings, as defined in 3-2-1/1.1i)

= 1.67 for axial or bending