The typical cross-section drawings

Typical cross-section drawings show the standard transverse structural arrangement of a vessel at representative locations, such as cargo hold, mid ship or engine room. They define hull structural members, plate thicknesses and stiffener sizes, giving an overview of how the primary construction is arranged at those positions. 

These drawings serve as the basis for structural strength calculation, classification society approval, and multi-discipline design coordination.

In MasterShip they are presented as paper-space drawings that are somewhat similar to the arrangement drawings. An example is shown in the figure below.

Figure 1: example of the typical  cross-section drawing

Which SHIP-commands apply?

This deliverable is similar to the deliverable ‘arrangement drawings’, so the relevant commands and workflow are the same as for the arrangement drawings (see the article “How to make arrangement drawings”). The command SHIPUPDATEARRANGEMENTDRAWINGS can be used to define the cross-section drawing set and to update them when needed. You can also use the frame drawing(s) of the according typical cross-section(s) directly.

In addition, you can also export this drawing to, for example, PDF-format. Using the steps in this article: Making paper-space views using MasterShip's templates.

Export & deliver the typical cross-section drawings to, for example, a client or subcontractor for review, or to the engineering team. You could also export the drawings as DWG, or in another file format.

How can the typical cross-section be used?

The typical cross-section can be used in several ways. Its main applications are as follows:

• Preliminary verification of longitudinal and local strength: Geometric parameters are extracted from the transverse section to calculate moment of inertia and section modulus for hull girder longitudinal strength check. High-stress zones at side shell and bottom are evaluated to verify whether member arrangement complies with classification society rules.
• Matching check between hull form and principal dimensions: Parameters including depth, camber, bilge radius and side shell inclination are marked on the drawing. It verifies the compatibility among principal dimensions, design waterline, freeboard and bottom hull form, and checks whether compartment height satisfies operational requirements.
• Estimation of weight and center of gravity (COG): The plate weight of hull structure is estimated according to the dimensions of structural members shown on the section. Combined with sectional distribution along the ship length, it assists the calculation of lightship weight, LCG, TCG and KG for preliminary stability and floating condition calculation.
• Design of compartments and divisions: It shows the positions of watertight bulkheads, decks and platforms, clarifying transverse divisions of cargo holds, ballast tanks and engine room. Compartment height and passage space are checked, providing transverse reference for general arrangement (GA) drawing.
• Multi-disciplinary coordination: Mechanical and outfitting disciplines refer to the transverse space to arrange equipment foundations, pipe routes and cable trays. It helps evaluate installation space for heavy equipment and identify potential spatial conflicts at early stage.
• Fundamental drawing for classification society submission: The typical cross-section is a mandatory drawing for basic design approval. Surveyors review structural arrangement, member scantlings, plate thickness selection and section strength against rules.
• Freeboard and rule verification: It is adopted for freeboard calculation and inspection of deck line, hatches and side openings. Preliminary checks on damage stability and watertight divisions are performed to meet SOLAS and classification society requirements.
• Baseline for subsequent detailed design: Structural configuration, plate thickness and member layout defined by the transverse section are passed to detailed design stage, acting as the baseline for structural detail drawings, shell expansion plans and 3D model construction.