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App.A: Selection of Verification Level [Table of Contents] App.C: Examples of Verification Documents

DNV-OSS-304 Risk Based Verification of Offshore Structures

[-] App.B: Example Verification Scope for Certification of Fixed Offshore Structures

APPENDIX B
Example Verification Scope for Certification
of Fixed Offshore Structures

App.B
A. Introduction

App.B
A 100   General

App.B A
101   This annex presents an example verification scope for certification of a typical fixed platform (jacket). The certification project is assumed to be carried out according to the principles of risk based verification as described in Section 1 and 2 of this document. This implies preparation of a verification plan that will be specific to each project. The verification plan will in the general case differ from the scope given in the tables below, but the tables will serve as a starting point for the verification planning.

App.B
B. Description of Terms used in the Scope of Work Tables

App.B
B 100   Abbreviations

App.B B
101   The following abbreviations are used. The definitions of which are given subsequently:
—A is audit
—S is surveillance
—H is hold point
—R is review
—I is for information.


App.B B
102   These abbreviations are DNV's preferred terms and normally will be used in DNV-generated documents. However, other terms, for example monitoring or witnessing, will be used by DNV if these are the terms commonly used in documents, such as Inspection and Test Plans, generated by others. In that case, it is expected that such terms are defined in these documents.

App.B
B 200   Audit

App.B B
201   Systematic and independent examination to determine whether quality activities and related results comply with planned arrangements and whether these arrangements are implemented effectively and are suitable to achieve objectives (ISO 8402:1994).

App.B
B 300   Surveillance

App.B B
301   Continual monitoring and verification of the status of an entity and analysis of records to ensure that specified requirements are being fulfilled (ISO 8402:1994).

App.B B
302   The amount of work involved in surveillance is not described in detail in the tables. This shall be part of the final contractual scope of work which shall define the frequency of surveillance based on the overall surveillance and the quality control performed by other parties as well as DNV's experience.

App.B B
303   The following shall be used to describe the frequency if it has not been specifically defined:
S1 = Surveillance on a visit basis, e.g. once per week or sample review 10-20%
S2 =Surveillance frequency at minimum once per day or review of 50-60%
S3 = Surveillance frequency at minimum once per shift or review of 100% of items

App.B
B 400   Design review

App.B B
401   Documents that are reviewed and specifically commented upon like a design specification are marked with R in the table.

App.B B
402   The review of the design will be performed according to one among the three levels of scrutiny. In the table the following abbreviations are used for the different level of scrutiny:
—R1 Review of drawings and design principles
—R2 Review of drawings and design principles and spot check of calculations
—R3 Verification of structural integrity by performance of independent calculations.

App.B
C. Overall Project Management

App.B
C 100   General

App.B C
101   The project quality management documentation, if part of scope, should be available for review at the early stages of the project, preferably before design is underway, to ensure that the necessary controls are in place.

App.B C
Table C1 Overall Project Management 
Item Description 

Level 

  Low Medium High 
1 review of project quality management documentation X X X 
2 audit of project quality management system   X 
3 review of sub-contractor control   X 
4 review of interface controls  X X 
5 review of methods of information flow   X 

App.B
D. Design

App.B
D 100   General

App.B D
101   An example scope of work for the structural design verification of a fixed offshore platform (jacket) is given in the following. For selection of verification level see Appendix A. For abbreviations used in the table see Appendix B Section B.

App.B D
Table D1 Scope of work for verification of structural design 
  Verification level 
Low  Medium High 
Substructure    
 Designers quality documents - R A 
 Structural design specification R R R 
 Design Brief - R R 
  R1 R2 R2 
   Ultimate Limit states R1 R2 R2 and R3 
 Fatigue Limit States R1 R2 R2 and R3 
 Accidental Limit States - R1 R2 
 Seismic Limit States - - R1 
 Fabrication Structural integrity in critical operations  - R1 R2 
 Load out Ultimate Limit states - R1 R2 
 Transportation Ultimate Limit states R1 R2 R2 and R3 
  Fatigue Limit States - R1 R2 
 Installation Ultimate Limit states R1 R2 R2 and R3 
      
 Foundation    
 Mud mats, skirts  R1 R2 
 Piles  Ultimate limit states R1 R2 R2 and R3 
  Fatigue Limit States R1 R2 R2 and R3 
  Accidental Limit States  R1 R2 
  Seismic Limit States   R1 
   Pile drivability   R1 
  Pile fatigue from driving  R1 R3 
 Soil data    R 
      
 Corrosion protection system   R1 
     
 Caissons    R1 
 Conductor guide details, riser guide details   R1 
 Other permanent appurtenance (Boat fenders etc.)   R1 
 Other temporary structures, Buoyancy tanks, pad eyes, etc.  R1 R2 
Deck and topside modules 
   Ultimate Limit States R1 R2 R2 and R3 
 Fatigue Limit States  R1 R2 
 Accidental Limit States  R1 R2 
 Seismic Limit States   R1 
 Fabrication Structural integrity in critical operations   R1 
 Load out   R1 R2 
 Transportation   R1 R2 and R3 
 Lifting   R1 R2 and R3 
 Crane support  R1 R2 R2  

App.B
E. Fabrication

App.B
E 100   General

App.B E
101   An example scope of work for verification of the fabrication of a fixed offshore platform (jacket) is given in the following. For selection of verification level see Appendix A. The verification level selected for fabrication may in the general case differ from what is used for design. For abbreviations used in the table see Appendix B Section B.

TABLE
Table E1 Scope of work for verification of fabrication

Notes

  1. Additional activities exists with respect to manufacturing of cast nodes.
  2. Production welding includes welding of mud mats, pile sleeves, boat landing, fenders, anode doubler plates, riser clamp doubler plates, riser/conductor guides, caissons and installation related items hereunder pad eyes for load out/handling etc.
  3. Additional requirements may exist for neoprene, PFP, etc.
App.A: Selection of Verification Level [Table of Contents] App.C: Examples of Verification Documents