Marine operations

Review of technical documentation and organization of technical supervision of conducting marine operations during the construction, modernization and disposal of offshore oil and gas facilities.

Marine operations are operations to assemble, transport, dock and install the offshore oil and gas facilities and their parts (units, tiers, columns, modules, containment systems, etc.) that are performed while the facility or any of its parts is afloat, or with the use of watercraft including at least 2 of the above stages. 

Types of offshore operations:

  • factory operations afloat - space-restricted offshore operations that are performed at the outfitting quay (pier) or within the fully-protected factory water area;

  • non-restricted marine operations - space-restricted operations afloat that are performed in a semi-protected water area or in open sea. 

Technical documentation of offshore operation projects that are developed according to the rules of another classification society or other standards may be approved by the Register alternatively or in addition to the requirements of the RS Rules for Planning and Execution of Marine Operations. 

Categories of marine operations depending on risk level 


Operation category

Risk description 

Assignment criteria

1

Simple operations.

Load-handling and installation operations with weight of item being handled of 35 to 300 t.

2

Well controlled operations or operations with low dependence on weather conditions.

 

Load-handling and installation operations with weight of item being handled over 300 t in protected water area.

Launching of item in protected water area.

Short-time towing.

Transportation of item on specialized watercraft.

3

Complex operations or operations that are particularly sensitive to weather conditions.

 

Load-handling and installation operations with weight of item being handled over 300 t in open sea.

Docking of units afloat.

Rolling-up of item on fixed or floating platform.

Long-time towing.

Launching of item open sea.

Installation of substructure on soil.

4

High-risk operations.

Long-distance ocean tow.

Installation of superstructure assembly.


Depending on the estimated time, the marine operations are divided into:

  • operations that are not weather-restricted – duration of operation is more than 72 hours;

  • operations that are weather-restricted – duration of operation is less than 72 hours. 

Operations with duration over 72 hours can be considered as restricted by weather conditions if the operation can be interrupted during its execution and the facility can be relocated to a protected place when the acceptable criteria for hydrometeorological conditions are exceeded. 

Review and approval of marine operation project 

Marine operation plans/projects of categories 1 and 2 are reviewed and approved by the Register Branch Offices without authorization by RHO.

Marine operation projects of categories 3 and 4 categories are reviewed and approved by the Register Head Office (RHO) or RS Branch Office on behalf of RHO.

Applications for review of marine operation project shall be sent to the appropriate Register Branch Office or RHO depending on the category of the operation.

The marine operation projects shall be approved without remarks. Approval is only granted after the designer has corrected all remarks. 

Survey of operation preparedness and technical supervision during marine operation. 

Survey of offshore operation preparedness is confirmed by a Report (Form 6.3.29) or a Conclusion Letter (depending on the offshore operation category) 

Scope of technical supervision depending on marine operation category 


Operation category

Review of operation plan/project

Technical supervision of operation progress.

Issued documents

1

It is checked if operation plan is in place

 

It is checked if head of operation is appointed who has required qualification

Report (Form 6.3.29) (readiness for operation)

2

Checking of availability and completeness of operation plan and project. Approval of towing project.

Checking of availability of documents on readiness for operation.

Conclusion Letter;

Report (Form 6.3.29) (readiness for operation)

3

Checking of availability and completeness of operation plan and project. Approval of towing guidelines and project

Checking of readiness for operation Monitoring of operation (except for the towing/transportation stage)

Conclusion Letter; Reports (Form 6.3.29) (readiness for operation, performing of operation)

4

Checking of availability and completeness of operation plan and project. Approval of operation project.

Monitoring of operation preparation and performance (except for the towing/transportation stage)

Conclusion Letter; Reports (Form 6.3.29) (readiness for operation, performing of operation)


Technical supervision by the Register does not substitute control of execution of marine operations by the designer, contractor, insurance surveyor and facility owner.

 

Offshore Oil and Gas Facilities Design Expertise Department

Head

Andrey Avdonkin

Phone

+7 812 3801954

E-mail

avdonkin.as@rs-class.org
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