Technical Project for Engine Replacement in Spain

When Is a Technical Project for Engine Change Required?

A naval technical project may be required when:

• The installed power is increased

• An inboard engine is replaced with a different propulsion system

• The type of propulsion is modified

• The total weight or center of gravity is altered

• The operational regime of the vessel changes

Any modification affecting stability, structure, or safety requires a structured technical assessment

Technical Analysis of Engine Replacement

The project evaluates:

• Newly installed engine power

• Structural compatibility of the engine foundation

• Loads transmitted to the hull structure

• Impact on weight distribution

• Possible variation in longitudinal trim

This analysis ensures that the hull structure can safely withstand the new propulsion configuration.

Stability Verification

When the new engine affects weight or positioning, it may be necessary to include:

• Calculation of the new center of gravity

• Verification of GM (metacentric height)

• Review of intact stability

• Transverse safety evaluation

A proper stability study guarantees that the vessel maintains adequate safety margins.

Documentation for the Spanish Maritime Authority

EThe technical file generally includes:

• Descriptive technical report

• Updated installation drawings

• Structural justification

• Stability calculations (when applicable)

• Complementary technical certificates

Incomplete documentation may result in administrative requirements or delays

Regulatory Compliance

The project must comply with:

• Spanish maritime legislation

• Requirements of the Dirección General de la Marina Mercante

• Regulations applicable according to vessel type and length

• Relevant technical directives and standards

The objective is to ensure legal approval without administrative incidents

Scope of Application

Applicable to:

• Recreational vessels

• Yachts and superyachts

• Professional-use units

• Engine replacement within refit processes

Each case requires individual technical analysis based on vessel configuration and operational profile.

Technical Safety and Administrative Validity

A properly prepared the engine replacement technical project:

• Reduces structural risks

• Prevents inspection issues

• Allows official documentation updates

• Ensures full legal compliance in Spain

The intervention of a chartered naval architect and marine engineer guarantees technical rigor and documentary validity.