The electronic pdf versions of the documents found through http://www.dnv.com/ are the officially binding versions. Copyright Det Norske Veritas.
![[Table of Contents]](/dwicons/b_toc.gif)
|
DNV-OSS-306 Verification of Subsea Facilities
|
SECTION 1
General Sec.1
A. General
Sec.1
A 100 Introduction
Sec.1 A
101 This DNV Offshore Service Specification (DNV-OSS-306) gives
criteria for and guidance on verification of the integrity and function
of parts or phases of subsea facilities.
Sec.1 A
102 This specification falls under the top level document DNV-OSS-300
Risk Based Verification.
Sec.1 A
103 The descriptions in this specification directly support a simplified
verification planning as described in Sec.2 F of DNV-OSS-300. When
using the advanced or combined planning, the descriptions will give
good references and starting points.Guidance note:
The latest revision of all DNV documents may be found in the publications
list in the DNV web site www.dnv.com.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.1
A 200 Objectives
Sec.1 A
201 The objectives of this specification are to describe the following
for a subsea facility:
| — | preparation of a Verification
Plan using DNV's risk differentiated levels of verification
activities and detailed example scope of work tables |
| — | DNV's implementation and reporting of the Verification Plan |
Sec.1
A 300 Scope of application for verification
Sec.1 A
301 This specification may be adopted for the verification of parts
of subsea facilities or selected project phases.
Sec.1 A
302 Subsea facilities typically comprise the following systems:| — | Downhole system |
| — | Subsea wellhead and tree system (including: choke, tubing hanger
and connection systems) |
| — | Manifold, foundations and template |
| — | Flowlines and risers (including dynamic umbilical risers) |
| — | Subsea control umbilicals |
| — | Subsea production control system |
| — | Subsea processing system |
| — | Well intervention/completion/workover
system |
| — | ROT intervention system |
which are applied in various configurations and tailored to each
particular project's specific requirements.
Sec.1 A
303 This specification describes the principles of a levelled verification
involvement. These principles may be applied both for planning of
any need or obligations for independent external verification (third
party) as well as internal company verification (second party).
Sec.1
A 400 Structure of this document
| — | Section
1 explains the relationship between this document and
DNV's overall risk based verification systematics. |
| — | Section
2 describes the activities for each project and
the project phases for a subsea system. |
| — | Appendix
A poses trigger questions to assist in the selection
of verification level example |
| — | Appendix
B gives detailed scope of work tables for the
different phases and levels of involvement. These tables are the
basis for the development of project specific scope of work tables. |
| — | Appendix
C gives example verification documents and describes
the documents issued during and as a result of the verification
process. The use of quality management systems is addressed here
also. |
Sec.1
B. Risk Based Verification
Sec.1
B 100 Elements of the service
Sec.1 B
101 The risk based verification concept is described in DNV-OSS-300
and visualized by Fig.1.
Fig. 1 The DNV Risk Based Verification Chain
Sec.1 B
102 The Verification Plan is the pivot element, with the Asset
Specification, Risk Assessment and Definition of Involvement Level
as input and the Verification Execution being the implementation.
Sec.1
C. Defining a Verification Plan
Sec.1
C 100 Risk based verification planning
Sec.1 C
101 The selection of the level of verification shall depend on the
risk level of each element having an impact on the management of
hazards and associated risk levels of the asset. The planning can
be simplified or detailed. This is further described in DNV-OSS-300.
Sec.1 C
102 This specification mainly aids in a simplified preparation
of the Verification Plan.Guidance note:
Risk can be evaluated based on safety, environmental impact, economics,
schedule, Public Relations, reputation or other criteria set by
the owner. The example tables are mainly generated on the basis
of safety and integrity risks. With business risk being the driver
for verification involvement this will normally warrant a need to
use the analytical approach and no the simplified one.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.1
D. DNV Subsea Facility Statements
of Compliance
Sec.1
D 100 General on verification
Sec.1 D
101 Verification describes the individual activities undertaken
by DNV at the various stages of design, construction and operation
of the subsea facility. The scope of the verification plan is ultimately
determined by the owner.Sec.1
D 200 Statement of compliance
Sec.1 D
201 A statement of Compliance may be issued by DNV to confirm
compliance according to the scope of work.Sec.1
D 300 General on certification
Sec.1 D
301 Certification describes the totality of verification activities
leading up to the issue of a Certification of Conformity. The scope
of work and verification plan, called a Certification Plan, is set
by DNV. All design and construction aspects, related to subsea facility
safety and integrity, must be covered by the Certification Plan.
Sec.1 D
302 This DNV-OSS does not define the scope of work necessary to
achieve a DNV Certificate of Conformity.Sec.1
E. Definitions / Abbreviations
Sec.1
E 100 General
Sec.1 E
101 Relevant definitions in ISO 13620 -1 also apply to this OSS.Sec.1
E 200 Abbreviations
| DCS | Distributed Control System |
| EDU | Electrical Distribution Unit |
| EPU | Electrical Power Unit |
| ETU | Electronic Test Unit |
| HPU | Hydraulic Power Unit |
| HTP | Hydraulic Test Panel |
| MCC | Motor Control Centre |
| MCS | Master Control Station |
| MQC | Multi Quick Connector |
| PT | Pressure Transmitter |
| SCM | Subsea Control Module |
| SCMMB | SCM Mounting Base |
| SCR | Subsea Control Room |
| SCU | Subsea Control Unit |
| SDU | Subsea Distribution Unit |
| SEM | Subsea Electronic Module |
| SPCU | Subsea Power & Communication Unit |
| TT | Temperature Transmitter |
| TUTU | Topside Umbilical Termination Unit |
| UPS | Uninterrupted Power Supply |
Sec.1
E 300 Verbal forms
Sec.1 E
301 "Shall":
Indicates requirements strictly to be followed in order to conform
to this OSS and from which no deviation is permitted.
Sec.1 E
302 "Should":
Indicates that among several possibilities, one is recommended as
particularly suitable, without mentioning or excluding others, or
that a certain course of action is preferred but not necessarily
required. Other possibilities may be applied subject to agreement.
Sec.1 E
303 "May":
Verbal form used to indicate a course of action permissible within
the limits of the OSS.Sec.1
E 400 Definitions
Sec.1 E
401 Client: DNV's
contractual partner. It may be the Purchaser, the Owner or the Contractor.
Sec.1 E
402 Construction phase: All
phases during construction, including fabrication, installation,
testing and commissioning, up until the installation or system is
safe and operable for intended use. In relation to subsea facilities,
this include transportation, on-shore and on-barge assembly, installation, rectification,
tie-in, pressure testing, commissioning and repair.
Sec.1 E
403 Design: All related
engineering to design the subsea facilities including both structural
as well as material and corrosion.
Sec.1 E
404 Design phase: An initial
phase that takes a systematic approach to the production of specifications,
drawings and other documents to ensure that the subsea facilities
meets specified requirements (including design reviews to ensure
that design output is verified against design input requirements).
Sec.1 E
405 Fabrication: Activities
related to the assembly of objects with a defined purpose. In relation
to subsea facilities, fabrication typically refers to the process
of assembly or transformation of e.g. plates, profiles and pipes
etc into production facilities and (installation /intervention)
tools
Sec.1 E
406 Hazard: A deviation
(departure from the design and operating intention) which could
cause damage, injury or other form of loss (Chemical Industries
Association HAZOP Guide).
Sec.1 E
407 HAZOP (HAZard and OPerability study): The
application of a formal systematic critical examination to the process and
engineering intentions of new or existing facilities to assess the
hazard potential of mal-operation or mal-function of individual
items of equipment and their consequential effects on the facility
as a whole (Chemical Industries Association HAZOP Guide).
Sec.1 E
408 Installation (activity): The
operations related to installing the equipment or structure, e.g.
marine operations related to placing equipment on seabed, tie-in,
piling of structure etc., including final testing and preparation
for operation.
Sec.1 E
409 Manufacture: Making
of articles or materials, often in large volumes. In relation to
subsea facilities, this typically refers to activities for the production
of various components under contracts from one or more Contractor
or Supplier.
Sec.1 E
410 Operations (phase): The
phase when the subsea facilities are being used for the purpose
for which it was designed.
Sec.1 E
411 Risk: The qualitative
or quantitative likelihood of an accident or unplanned event occurring,
considered in conjunction with the potential consequences of such
a failure. In quantitative terms, risk is the quantified probability
of a defined failure mode times its quantified consequence.Guidance note:
Risk is not only related to physical failure modes, but also
to operational errors, human errors and so on. For some risks the
functional failures or physical failure modes contributes less than 20% while
more than 80% of the risk relates to other devices.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.1 E
412 Risk Reduction Measures: Those
measures taken to reduce the risks to the operation of subsea facilities
and to the health and safety of personnel associated with it or
in its vicinity by:| — | Reduction in the probability
of failure. |
| — | Mitigation of the consequences of failure. |
Guidance note:
The usual order of preference of risk reduction measures is:- Inherent Safety
- Prevention
- Detection
- Control
- Mitigation
- Emergency Response
---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.1 E
413 Safety Objectives: The
safety goals for the construction, operation and decommissioning
of the subsea facilities including acceptance criteria for the level
of risk acceptable to the Owner.
Sec.1 E
414 Statement of Compliance: A
statement or report signed by a qualified party affirming that,
at the time of assessment, the defined subsea facilities phase,
or collection of activities, met the requirements stated by the
Owner.
Sec.1 E
415 Verification: An examination
to confirm that an activity, a product or a service is in accordance
with specified requirements.Guidance note:
The examination shall be based on information, which can be proved
true, based on facts obtained through observation, measurement,
test or other means.
ISO 8402: 1994: Verification: Confirmation by examination
and provision of objective evidence that specified requirements
have been fulfilled.---e-n-d---o-f---G-u-i-d-a-n-c-e---n-o-t-e---
Sec.1
F. References
Sec.1
F 100 General
Sec.1 F
101 A Guide to Hazard and Operability Studies, 1979, Chemical
Industries Association Limited, London
Sec.1 F
102 ISO 8402 Quality - Vocabulary, 1994, International
Organization for Standardization, Geneva
Sec.1 F
103 BS 4778 Quality Vocabulary, Part 2 Quality Concepts and Related
Definitions, 1991, British Standards Institute, London
Sec.1 F
104 EN 45011 General Criteria for Certification Bodies Operating
Product Certification, 1998, European Committee for Standardization,
Brussels
Sec.1 F
105 EN ISO 13628 Design and operation of subsea production systems
- series.
![[-]](/dwicons/i_colpse.gif)