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DNV-OSS-304 Risk Based Verification of Offshore Structures

Sec.2: Service Overview

SECTION 2
Service Overview

Sec.2
A. General

Sec.2
A 100   Objectives

Sec.2
B. Service Process

Sec.2
B 100   General principles

Project initiation:

—	conceptual design.

 Project realisation:

—	detail design
—	construction
—	installation
—	as-built/as-installed documentation, including Design Fabrication and Installation (DFI) resume.

 Project operation:

—	operation manuals
—	operations, maintenance and repair.

Project abandonment:

—	decommissioning
—	removal.

Sec.2
C. Project Initiation

Sec.2
C 100   Verification of conceptual design

Guidance note:
The level of development may be expressed as expected accuracy for cost and weight estimates or as the level to have been reached where the design documents are suitable as basis for placing steel order.

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Verification work carried out during this phase may be used to define the verification plan for later phases as well as to give input to evaluations of suitable verification level low, medium or high for later phases.

Sec.2
D. Project Realization

Sec.2
D 100   General

Sec.2
D 200   Verification of overall project management

Sec.2 D

Table D1 Scope of work for verification of overall project management
	Level
Verification activity	L	M	H
Review of the project management process by
— review of project quality management documentation.	x	x	x
— audit of project quality management system		x	x
— review of sub-contractor control		x	x
— review of interface controls		x	x
— review of methods of information flow			x

Sec.2 D
205   The verification of the overall project management quality system and documentation is optional. The reviews and audits should typically be performed if an extensive verification of a project is performed.

Sec.2
D 300   Verification during design

Sec.2 D

Table D2 Scope of work for verification of design
Verification activity	Level
	L	M	H
Designer's QA system
— audit of designer's QA system	x	x	x
Review of structural specifications for design by
— review of the design basis with emphasis on the design criteria	x	x	x
Review of design procedures by
— review of design brief	x	x	x
Review of drawings by
— review of drawings and main principles for the majority of the structure (scrutiny level R1) with review according to scrutiny level R2 and R3 only for the few elements with the highest risk	x
— review of drawings and main design principles and spot check of design reports (scrutiny level R2) for the majority of the main structure, applying scrutiny level R1 for the least risk elements, and R3 for elements with the highest risk		x
— review of drawings and main design principles and independent calculations (scrutiny level R3) for the majority of the main structure, applying scrutiny level R1 for the least risk elements and R2 for elements with moderate risk			x
Review of interfaces
— check designer system for interface control		x	x
— independent check of the most important interfaces			x
Review of test
— review of model or structural test		x	x
— witness of testing			x
Review of specifications for construction and operation by
— spot check of critical aspects	x	x	x
— review of main specifications		x	x
— thorough review of main specifications			x

Guidance note:
Design verification activities may be split up between Basic Design and Detailed Design, or other sub-phases, depending on type of contract.

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Sec.2
D 400   Verification during fabrication

Sec.2 D

Table D3 Scope of work for verification of manufacturing and fabrication
Verification activity	Level
	L	M	H
Review of the manufacturing and fabrication process
— Review of : Quality system organisation Quality responsibilities and authority Resources and personnel Operational procedures and instructions	x	x	x
— Audit of: Human Resources Capability review Employee training Internal and external support functions Interface control Design and development Documentation and quality records		x	x
Review of manufacturing and fabrication procedures
— Review manufacturing, fabrication and inspection procedures for confirmation of compliance with the manufacturing specification	x	x	x
— Review method statements		x	x
Review of qualification process
— Review of the Manufacturing Procedure Specification, (MPS), Manufacturing Procedure Qualification Test (MPQT), as applicable	x	x	x
— Full time attendance during MPQT, as applicable, or first day production		x	x
Surveillance during manufacturing and fabrication activities
— Audit-based attendance during manufacturing and testing, to ensure, based on spot checks (level S1 in majority), that the delivered products are produced in accordance with the manufacturing specification with attendance according to level S2 and S3 only for the few elements with the highest risk	x
— Audit-based and/or part-time attendance during manufacturing and testing to ensure, based on spot checks (level S2 in majority), that the delivered products are produced in accordance with the manufacturing specification with attendance according to level S1 for the least risk elements and S3 for elements with the highest risk		x
— Full-time attendance during manufacturing and testing for the majority of the structure (level S3) level S1 for the least risk elements and S2 for elements with moderate risk			x
Review of final documentation
Final documentation received for information	x
Review of principles (R1)		x
Review of principles and spot check of correctness (R2)			x

Guidance note:
Materials may be ordered with certificates of varying degrees of independent third party verification This can be integrated into the overall verification activities, in order not to duplicate work.

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Sec.2
E. Project Operation

Sec.2
E 100   Verification during operation

Sec.2 E

Table E1 Scope of work for verification of operations
	Level
Verification activity	L	M	H
General review of the main document(s) to check compliance with applicable design documentation. Audit during repair and modification.	x	x	x
Audit attendance during start-up of periodical survey, modification and repair activities. For critical aspects, as identified by the requirement for maintenance of certificate, audit attendance throughout the activities. Review of contractors' documentation of the survey/modification.		x	x
Review of the main document(s) to check compliance with applicable codes and standards. Audit attendance during start-up and performance of periodical survey, modification and repair activities. For critical aspects, as identified by the requirement for maintenance of certificate, full attendance throughout the preparations of and the activities. Issuing of independent confirmation documentation of the survey/modification.			x

Sec.2 E
106   Verification during operations is carried out to confirm that the structure continues to meet the Owner's specified requirements for integrity.

Sec.2 E
107   Annual assessments may be carried out to confirm that any changes in the structural configurations (additional loads, damage etc.), are within acceptable limits and that the facility continues to be fit for the intended purpose.

Guidance note:
Annual assessments do not necessarily involve annual inspections as such regular inspections may not be required under a risk-based inspection strategy. Annual assessments may be limited to review of records confirming that the facility has operated within its design limits.

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Sec.2
F. Verification Documents

Sec.2
F 100   General