Through its extensive set of tools for designing and calculating stability and strength, NAPA offers comprehensive functionality beyond the initial design phase.

The NAPA Manager automates routine tasks, such as calculation of probabilistic damage stability and generation of statutory documents during the design process.

The NAPA system has been approved, and is continuously used, by the world’s leading classification societies and maritime administrations, a factor which means a smooth approval process. Typical users of the NAPA Statutory Compliance features also include shipyards and engineering companies. In addition, NAPA is one of the main tools used by experts in the development of new stability regulations.

Main features of NAPA for Statutory Compliance are:

• Intact and damage stability evaluation for all existing regulations
• Generation of limiting GM/KG curves
• IACS longitudinal strength
• Shear force corrections
• Inclining test
• Grain stability
• Offshore structure stability
• Freeboard and tonnage
• Automatic document generation
• Trim and Stability Booklet
• Damage Stability Booklet

NAPA has proved its power and efficiency in the field of stability analysis. Thanks to the strong product model and the extremely fast and accurate calculation engine, NAPA is the de facto standard for the shipbuilding industry.

NAPA includes a comprehensive stability criteria library covering a substantial portion of the existing statutory requirements. In addition, criteria can be defined for any existing and future stability regulation.

A typical example demonstrating NAPA’s quick design evaluation capability is the handling of flooding openings in damage stability calculations. As the immersion of openings is calculated on the basis of stability results (except in the case of progressive mode calculations, where the openings affect directly the stability results), no recalculation is needed when openings are redefined.

This is illustrated in the following flowchart:

Changing of an opening, e.g. in MARPOL calculations immediately updates the output as the hydrostatics of the damage do not change. The only action required is a little scrolling.

NAPA for Statutory Compliance extends beyond stability evaluations. Freeboard calculations according to the Amendments to Annex B to the 1988 Load Lines serve as a good example. These calculations are easy to perform, as the ship model already includes the input needed (e.g. bow height, length of superstructures and block coefficient) as primary data.