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Sec.1: General [Table of Contents] App.A: Selection of Verification Level

DNV-OSS-306 Verification of Subsea Facilities

[-] Sec.2: Service Overview

SECTION 2
Service Overview

Sec.2
A. General

Sec.2
A 100   Objectives

Sec.2 A
101   The objectives of this section are to provide:
—an overview of life cycle verification activities relating to the system
—details of DNV's verification services for subsea facilities.

Sec.2
B. Service Process

Sec.2
B 100   General principles

Sec.2 B
101   The description of the process of DNV's verification of subsea facilities is based on distinct project phases and the recognition of key milestones.

Sec.2 B
102   Verification performed by DNV normally progresses through one or more of these project phases and may include all or selected aspects of the project.

Sec.2 B
103   The risk based verification process is described in relation to the normal project phases:

Project initiation:
—Conceptual design

Project realisation:
—Detail design
—Construction
—Manufacturing of subsea facilities
—Manufacturing and fabrication of subsea facilities components and assemblies
—Installation
—Project completion (pre-commissioning)
—Commissioning
—Issue of as-built/as-installed documentation, including Design Fabrication and Installation (DFI) resume

Project operation:
—Issue of Operation Manuals
—Operations, maintenance and repair

Project abandonment
—Decommissioning
—Removal

Sec.2
B 200   Simplified verification planning

Sec.2 B
201   The steps in the simplified verification planning are as follows:
—Use trigger questions to assess the overall risk level of the project (or manageable elements thereof).
—Evaluate the risk against the relevant owner or project acceptance criteria (often this can be directly tied to the owner core values or a sub-set of these) and decide whether the general verification involvement shall be Low, Medium or High.
—Use the example detailed scope of work tables in Appendix B to make a first draft of a Verification Plan
—Generate the project specific Verification Plan by including a project specific engineering judgment or risk analysis to adjust the table to suit the project.
—Perform the verification execution according to the Verification Plan, making revision to the plan if and when necessary.
—Report the verification.


Sec.2 B
202   The trigger questions are included in Appendix A.

Sec.2 B
203   Generic scopes of work for verification at the three levels of verification; Low (L), Medium (M) and High (H), are given in the tables in this section.

Sec.2 B
204   Project specific detailed scope of work descriptions, based on the generic scopes of work tables and showing all the activities to be verified, should be made. Examples of the level of detail are given in Appendix B.

Sec.2 B
205   It is the tables in this section 2 that give the principle difference between the levels of verification involvement. The detailed example tables are to be treated as examples only. They shall not be used without a project specific confirmation of their completeness.

Sec.2 B
206   The project specific scope of work definition, derived from the tables in Appendix B (or similar), shall be part of the final DNV verification report.

Sec.2
B 300   Selection of level of verification

Sec.2 B
301   The selection of the level of verification for the simplified verification planning is facilitated by the trigger questions included in Appendix A.

Sec.2
B 400   Codes, standards and reference documents

Sec.2 B
401   The verification process described in this DNV-OSS is not tailored to a specific technical standard, code or reference document.

Sec.2 B
402   It is recommended to use internationally recognised codes or standards. Where combinations of standards and external criteria are used the exact terms of reference and documents to be issued shall be agreed at the beginning of the project and formally defined in the contract.

Sec.2 B
403   It is recommended strongly not to mix standards due to the possible differences in safety philosophies.

Sec.2
C. Project Initiation

Sec.2
C 100   Verification during conceptual design

Sec.2 C
101   Verification during the conceptual and/or feasibility studies of a project and in the early stages of a project can reduce the need for verification during the design and construction phases, and can reduce costs during the long term operation, inspection and maintenance phases.

Sec.2 C
102   It is recommended to combine the mechanical design verification during project initiation phase with additional review of:
—environmental aspects
—project schedule
—cost.


Sec.2 C
103   During this phase it can be beneficial to make an initial verification plan. Risk evaluations are carried out during this phase and should be used to get an indication of the general verification level; Low, Medium or High.

Sec.2
D. Project Realization

Sec.2
D 100   General

Sec.2 D
101   All design and construction aspects, relevant to subsea facility, may be covered by the life cycle verification.

Sec.2 D
102   In this specification the split in the scope of work between design and construction is made between sets of requirements (specifications) developed during design and description of the steps necessary to satisfy the specification (procedures) showing how construction will be implemented.

Sec.2
D 200   Verification of overall project management

Sec.2 D
201   Verification of the overall project management is the examination of the means of controlling the entire subsea development project, or the phase for which verification is undertaken.

Sec.2 D
202   This verification should confirm that the necessary controls are in place to ensure information flow across the various interfaces. It is especially important where separate contractors have been employed for different phases of the project such as design and installation.

Sec.2 D
203   Typically the documentation is expected to be in line with ISO 9000 requirements.

Sec.2 D
204   Definition of scope of work for verification of overall project management should follow Table 2-1.

Sec.2 D
Table 2-1 Scope of work for verification of overall project management  
Verification activity Level 
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 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, while might be omitted for smaller sub-phase verifications.

Sec.2
D 300   Verification During Design

Sec.2 D
301   Design verification is the examination of the assumptions, methods and results of the design process and is performed at the specified level of verification to ensure that the specified requirements of the subsea facility will be achieved.

Sec.2 D
302   Design verification should consist of one, or some, of the following:
—review of the design process,
—review of specifications for design (Asset specifications),
—review of design reports and drawings,
—performing of independent parallel calculations,
—review of specifications for construction and operation, resulting from design.


Sec.2 D
303   The documents that shall be produced in the project should as a minimum satisfy the requirements of the selected code.

Sec.2 D
304   Definition of scope of work for verification of design should follow Table 2-2.

Sec.2 D
Table 2-2 Scope of work for verification of design  
Verification activity Level 
L M H 
Review of specifications for design by    
—review of the design basis with emphasis on the design criteria
 		x x x 
Review of design reports and drawings by    
—review of the main documentation to ensure that the main load conditions have been accounted for in design, that the governing conditions are identified, and that the chosen design philosophies are in accordance with specified codes and standards
 		x x x 
—evaluation of the main methods used and spot checks of the input data and the calculation
results
 		 x x 
—detailed review of main design reports
 		  x 
Performing independent parallel calculations by    
—check of pressure containment or overall
structural integrity
 		x x x 
—simplified independent analysis/calculation(s) performed by spot checks
 		 x x 
—advanced independent analysis/calculation(s) performed by spot checks
 		  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 
Review of specific operational challenges (e.g. flow assurance    
—general principles
 		x x x 
—review of main documents supported by simplified analyses
 		 x x 

Sec.2
D 400   Verification During Construction

Sec.2 D
401   The construction phase comprises fabrication, manufacturing, sub-unit / unit integration testing, installation and commissioning. An important element is to ensure that the contractual design requirements are incorporated in the purchase documentation, and that correct materials, joining and corrosion control, have been applied, and that pressure rating, capacity and function are meeting the requirements as per approved specifications and procedures. It is imperative that relevant preparations for this is started as early as possible, e.g. by the appointment of a vendor supply verification co-ordinator.

Sec.2 D
402   Verification during construction is carried out by means of full time attendance, audits, inspection or spot checks of the work, as appropriate, in sufficient detail to ensure that the specified requirements of the subsea facility will be achieved.

Sec.2 D
403   Verification of these activities relates not only to the contractor's work but also to the monitoring of this work carried out by others.

Sec.2 D
404   During construction verification should consist of one, or some, of the following:
—reviewing the construction process,
—reviewing construction procedures,
—reviewing qualification process,
—surveillance during construction activities,
—reviewing final documentation.


Sec.2 D
405   The documents that should be produced in the project and submitted for review prior to start up are typically:
—Manufacturing Procedure Specification (MPS)
—Manufacturing procedures, including test requirements and acceptance criteria, repairs, personnel qualification records etc
—Material specifications
—Quality plans
—Welding Procedure Specifications (WPS) / Welding Procedure Qualification Record (WPQR)
—NDT procedures
—Manufacturing Procedure Qualification Test (MPQT) results; and
—Manufacturer's / fabricator's quality system manual


Sec.2 D
406   Particularly for installation it is highly recommended to prepare a formal 'ready for start of installation' document to be verified prior to commencement.

Sec.2 D
407   The "as-built" documentation to be submitted after manufacturing should include but not be limited to:
—Manufacturing procedures including test requirements and acceptance criteria, repairs, personnel qualification records etc
—Material certificates
—Production test records (visual, NDT, test samples, dimensional, heat treatment etc.)
—Hydrostatic test report
—Commissioning report
—Relevant statistics of chemical composition, mechanical properties and dimensions for the deliveries
—Relevant logs


Sec.2 D
408   Definition of scope of work for verification of manufacturing and fabrication Table 2-3 and Table 2-4 for installation and Table 2-5 for final testing and completion.

Sec.2 D
Table 2-3 Scope of work for verification of manufacturing and fabrication  
Verification activity Level 
L M H 
Review of the manufacturing and fabrication process    
—Review of manufacturing and fabrication management systems
 		x x x 
—Audit of the quality management system
 		 (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 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    
—Visit-based attendance during testing, to ensure, based on spot checks, that the delivered products have been produced in accordance with the
manufacturing specification
 		x x x 
—Visit-based or full-time attendance during manufacturing and fabrication to ensure, based on spot checks, that the delivered products have been produced in accordance with the
manufacturing specification
 		 x x 
—Full-time attendance during manufacturing and fabrication to ensure, based on spot checks, that the delivered products have been produced in
accordance with the manufacturing specification
 		  x 
Review of final documentation x x x 

Sec.2 D
Table 2-4 Scope of work for verification of installation 
Verification activity Level 
L M H 
Review of installation procedures    
—Spot check of Installation Manual, (IM)
 		x x x 
—For critical operations (identified from the FMEA and HAZOP studies) review the IM
 		 x x 
Review of qualification process    
—For critical operations, review the qualification of the IM
 		x x x 
—Full time attendance during qualification tests, if applicable, or production start-up
 		 x x 
Surveillance during installation activities    
—Visit-based attendance during start up of each offshore operation (i.e. installation, completion, intervention works, etc).
 		x x x 
—Full time attendance during defined test and
trials
 		 x x 
Review of final documentation x x x 

Sec.2 D
Table 2-5 Scope of work for verification of final testing for operation, including as-built survey and project completion 
Verification activity Level 
L M H  
Review of procedures     
—Review of the procedures for infield tests and commissioning to ensure that the procedure
adequately covers the system in accordance with the design requirements
 		x x x  
Surveillance during testing and completion activities     
—Full time attendance during commissioning
 		 x x  
—Full time attendance during specific tests testing and audit based attendance during ongoing
testing
 		  x  
—Review of test results
 		x x x  
Review of final documentation     
—Spot check of as-built documentation
 		x x x  
—Review of as-built documentation
 		  x  

Sec.2
E. Project Operation

Sec.2
E 100   Verification during operation

Sec.2 E
101   Verification during operation is carried out by audit or spot check of the work in sufficient detail to ensure that the specified requirements of the subsea facilities continue to be achieved.

Sec.2 E
102   Assessment of these activities will relate to the Owner's, as well as any contractor's, work.

Sec.2 E
103   During operations, these assessments should consist of:
—review of operations processes:
—review of operations management systems,
—audit of the quality management system, if necessary,
—review of operations specifications and procedures:
—confirmation of design assumptions,
—method statements,
—inspection plans,
—inspection methods,
—procedures for evaluation of inspection results,
—attendance during operations activities:
—attendance during inspections,
—review of inspection records.


Sec.2 E
104   In order to be able to carry out periodical surveys, the minimum documentation should include:
—personnel responsible for the operation of the subsea facilities
—history of the subsea facilities operation with reference to events that may have significance with respect to safety and functionality
—installation condition data as required
—physical and chemical characteristics of transported media including sand and sand detection measures
—inspection and maintenance / intervention philosophy, schedules and records
—inspection / intervention procedures and results as appropriate.


Sec.2 E
105   Definition of verification of the operations phase should follow Table 2-6.

Sec.2 E
Table 2-6 Scope of work for verification of operations 
Verification activity Level 
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 contract, 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 contract, 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 subsea facilities continue to meet the Owner's specified requirements.

Sec.2 E
107   Annual assessments may be carried out to confirm that any deterioration of the subsea facilities are within acceptable limits and that the facilities continues to be fit for the intended purpose.



Sec.2 E
108   Additional assessments should be carried out to confirm that any damage, deterioration or modification to the pipeline system or other systems does not render the subsea facilities unsuitable for the intended purpose.

Sec.2
F. Verification Documents

Sec.2
F 100   General

Sec.2 F
101   The hierarchy of verification document is given in DNV-OSS-300 Appendix B. The descriptions of the content of these documents as well as examples of document forms are given in Appendix C to this specification.
Sec.1: General [Table of Contents] App.A: Selection of Verification Level