02

Calculations in
Compliance with RMRS Requirements

Following the development of the vessel concept, a comprehensive set of engineering calculations is carried out in accordance with the requirements of the Russian Maritime Register of Shipping (RMRS). This stage is essential for verifying safety, structural integrity, stability, reliability of design solutions, and the feasibility of obtaining classification approval for the project.

Calculations are performed in accordance with the current RMRS Rules, taking into account the vessel type, intended service, navigation area, assigned class notation, ice class, operating conditions, design service life, and equipment configuration. Where applicable, relevant international regulations and standards are also considered to ensure full compliance with project requirements.

At this stage, the principal characteristics of the vessel and its structural components are thoroughly verified. Structural strength calculations are performed for the hull, including the determination of scantlings for shell plating, decks, bulkheads, framing systems, foundations, reinforcements, and other structural elements. Analyses account for static and dynamic loads, weight distribution, wave-induced forces, ice loads, wind loads, operational loads, and required load combinations.

Stability assessments are conducted to evaluate displacement, center of gravity position, metacentric height, stability curves, stability criteria, and compliance with RMRS requirements under various loading conditions. These calculations are critical for demonstrating the vessel's safe operation within its intended service profile.

The arrangement of watertight bulkheads is established, and the vessel's ability to maintain buoyancy and stability under damage conditions is evaluated in accordance with applicable damage stability requirements.

For vessels intended to operate in ice-covered waters, ice-strength calculations are performed. These analyses determine design ice loads, required plating thicknesses in the ice belt area, framing dimensions, safety factors, and structural arrangements necessary to achieve the specified ice class.

Material selection and structural allowance calculations are also carried out. Steel grades and other construction materials are selected based on design temperatures, mechanical properties, operating conditions, corrosion considerations, and durability requirements. For structures with extended service life, appropriate corrosion allowances are incorporated into the design.

A separate scope of work is dedicated to calculations for shipboard systems and equipment. This includes determining pipeline diameters, operating pressures, pump capacities, and the design parameters of ventilation, cooling, bilge, ballast, fuel, firefighting, and other vessel systems. Materials, valves, equipment, and system configurations are verified for compliance with RMRS requirements.

Where innovative engineering solutions, non-standard structures, or advanced calculation methods are applied, additional technical justifications are prepared. These documents support the acceptance of such solutions and facilitate their review by RMRS.

Engineering calculations are not performed in isolation but as part of an integrated vessel design process, taking into account the vessel's overall architecture, arrangement, equipment configuration, ship systems, and operational profile. This approach enables evaluation of the vessel as a complete engineering system rather than as a collection of individual components.

The outcome of this stage is a comprehensive package of engineering calculations and supporting documentation confirming compliance with RMRS requirements. These calculations form the technical foundation for the development of design documentation, 3D models, detailed production drawings, classification approval, and subsequent vessel construction.

By validating key design parameters at an early stage, this process significantly reduces technical risks and provides a reliable basis for successful project execution and long-term operational performance.