Marine warranty survey

Handling, transport and offshore installation of large structures

RINA offers certification services for insurance warranty, or Marine Warranty Survey (MWS), for the handling, sea transport and offshore installation of large structures, such as fixed platforms, wind generators, subsea facilities (oil and gas pipelines , electric cables, mooring systems) etc.

The Marine Warranty Survey guarantees that the work is planned and performed according to a level of risk that is consistent with the reference international standards and insurance policy clauses and tolerable for the industry and for all the players involved.

Service details

The Marine Warranty services, that commonly cover design assessments and on site supervision, generally concern the following types of marine operations:

Service procedure

The certification involves the issue, before the operation starts, of formal approval which confirms that the operation planning and the dedicated equipment design are in compliance with the requirements of RINA Rules or other applicable internationally-recognised standards.

After the operation is completed, a "Certificate of Conformity" is also issued assuring the suitability of the vessels, materials and equipment used in the operations, as well as their correct execution in conformity with approved procedures.

The team appointed to perform the service comprises specialised marine and structural engineers and specialists with marine and offshore operating experience.


RINA has verified and certified maritime transports for decades (at least 20 operations a year) according to our in-house regulations, developed for this specific activity and kept updated according to shared experiences, lessons learnt, studies performed and the development of available technologies.

Our services are recognized by insurance brokers and Flag Administrations as regards the issue of the authorizations they are competent for.

RINA is also regularly involved in the verification of offshore projects, especially as regards construction and installation activities, where we can provide a long list of references.


How is the scope of work of Marine Warranty Survey certification defined for individual projects?

The scope of work and the relative battery limits must be agreed on a case-by-case basis depending on the characteristics of the work and the associated level of risk.

Is the MWS performed by a single expert who goes on site and certifies the operations?

No, the on-site audit is performed only upon completion of the documents review performed at our offices on manuals, procedures and calculation notes.

Can any professional firm with sufficient know-how perform MWS certification services?

No, only firms that have been formally recognised by insurance companies are authorized to provide this service.

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