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DNV-OS-B101 Metallic Materials
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Ch.3
SECTION 1
Certification and ClassificationCh.3 Sec.1
A. General
Ch.3 Sec.1
A 100 Introduction
Ch.3 Sec.1 A
101 As well as representing DNV's recommendations on safe
engineering practice for general use by the offshore industry, the
offshore standards also provide the technical basis for DNV classification,
certification and verification services.
Ch.3 Sec.1 A
102 A complete description of principles, procedures, applicable
class notations and technical basis for offshore classification
is given by the DNV Offshore Service Specifications for classification,
see Table A1.
Ch.3 Sec.1 A
| Table A1 DNV Offshore
Service Specifications |
| No. | Title | DNV-OSS-101 | Rules for Classification of Offshore Drilling
and Support Units | | DNV-OSS-102 | Rules for Classification of Floating Production and
Storage Units | |
Ch.3 Sec.1 A
103 Classification procedures and requirements specifically applicable
in relation to the technical provisions in Ch.2 are given
in this chapter of the offshore standard.Ch.3 Sec.1
A 200 Assumptions
Ch.3 Sec.1 A
201 Any deviations, exceptions and modifications to the design
codes and standards given as recognised reference codes shall be
documented and approved by DNV.
Ch.3 Sec.1 A
202 Aspects of the design and construction provisions of this
standard (Ch.2) which shall be specially
considered, agreed upon, or may be accepted are subject to DNV approval when
the standard is used for classification purposes.
Ch.3 Sec.1 A
203 DNV may accept alternative solutions found to represent an
overall safety level equivalent to that stated in the requirements
of this standard.Ch.3 Sec.1
B. Specific Certification or Classification
Requirements
Ch.3 Sec.1
B 100 General
Ch.3 Sec.1 B
101 The following requirements shall be applied in conjunction
with the technical requirements in Ch.2 of this standard when used
for certification or classification purposes. Ch.3 Sec.1
B 200 Information to be supplied by the
purchaser
Ch.3 Sec.1 B
201 The purchaser shall supply the manufacturer with all information
necessary to ensure that survey and certification can be carried
out in accordance with the appropriate requirements. This applies
particularly where optional or additional conditions are specified
in the relevant construction standards.Ch.3 Sec.1
B 300 Approval of manufacturers
Ch.3 Sec.1 B
301 All steel materials delivered with NV or works certificate
shall be made at works approved by DNV.All wrought aluminium products shall be manufactured at works
approved by DNV
Approved manufacturers are published on DNV Exchange on the
Internet.
Ch.3 Sec.1 B
302 In order to be approved, the manufacturer shall demonstrate
and submit documentation to the effect that the necessary manufacturing,
testing and inspection facilities are available and are supervised
by qualified personnel. The manufacturer shall also carry out a
test programme and submit the results.
Ch.3 Sec.1 B
303 Detailed programmes for approval testing are given in Standards
for Certification No.2.9.
For steel grade NVBW and t £ 25 mm, impact testing
performed during AoM may replace the testing required in Ch.2 Sec.1, Table A1.
When a manufacturer has more than one works, the approval is
only valid for the works which carried out the test programme.
Ch.3 Sec.1
B 400 Survey during manufacture
Ch.3 Sec.1 B
401 The surveyor shall be given the opportunity to inspect and
check at any time all plants and equipment used in the manufacture
and testing. The manufacturer shall assist the surveyor to enable
him to verify that approved processes are adhered to and to witness
the selection and testing as required by the standards.
Ch.3 Sec.1 B
402 Prior to the testing and inspection, the manufacturer shall
provide the surveyor with the technical specifications of the order
and any conditions additional to the standard requirements.Ch.3 Sec.1
B 500 Selection of test material and testing
Ch.3 Sec.1 B
501 All test material shall be selected and marked by the surveyor,
unless otherwise agreed.
Ch.3 Sec.1 B
502 All testing shall be witnessed by the surveyor, unless otherwise
agreed.Ch.3 Sec.1
B 600 Identification of materials
Ch.3 Sec.1 B
601 The manufacturer shall adopt a system of identification which
enable all finished material to be traced to the original cast.
The surveyor shall be given full facilities for so tracing the materials
when required.
Ch.3 Sec.1 B
602 Before acceptance, all materials which have been tested and
inspected with satisfactory results shall be clearly marked by the
manufacturer in at least one place with DNV brand, as furnished
by the surveyor, and the following particulars:| — | manufacturer's name
or trade mark |
| — | material grade |
| — | identification number, cast number or other marking which
will enable the full history of the product to be traced |
| — | if required by the purchaser, his order number or other identification
mark. |
Ch.3 Sec.1 B
603 Where a number of light materials are securely fastened together
in bundles the manufacturer may brand only the top piece of each
bundle, or alternatively, a firmly fastened durable label containing
the brand may be attached to each bundle.
Ch.3 Sec.1 B
604 The marking is normally made by hard stamping, however, other
methods may be accepted.
Ch.3 Sec.1 B
605 In the event of any material bearing DNV brand failing to
comply with the test requirements, the brand shall be unmistakably
defaced by the manufacturer.Ch.3 Sec.1
B 700 Certification of materials
Ch.3 Sec.1 B
701 Certification of materials will be based on compliance with
all specified tests and inspection. Unless otherwise specially approved,
certification shall take place at the manufacturer's works
and the surveyor shall attend and witness testing and inspection
in accordance with the appropriate requirements of Ch.1 and Ch.2.Certification of materials shall be documented as given in DNV-OSS
101 Ch.1 Sec.4 A1008.
Ch.3 Sec.1 B
702 As an alternative to 701, certification may be based on a Manufacturing
Survey Arrangement (MSA), subject to approval by DNV.
Ch.3 Sec.1 B
703 Normally, separate inspection certificates are issued for each
grade of material and each product form. The inspection certificate
shall include the following particulars:
| — | purchaser's name and
order number and if known the unit identification for which the
material is intended |
| — | manufacturer's name |
| — | description of the product, dimensions, weight, etc. |
| — | identification of specification or grade of material |
| — | identification of the cast and product |
| — | ladle analysis for specified elements |
| — | results of all specified inspections and mechanical
tests |
| — | condition of supply and where appropriate, details of
heat treatment. |
Ch.3 Sec.1 B
704 Where applicable, the manufacturer shall provide the surveyor
with inspection certificates for all accepted materials giving at
least the particulars detailed in 703. Before the inspection certificates
are signed by the surveyor, the manufacturer shall furnish him with
a written declaration stating that the material has been made by
an approved process and that it has been subjected to and has withstood
satisfactorily the required tests. The following form of declaration
will be accepted if stamped or printed on each inspection certificate with
the name of the works and signed by an authorised representative
of the manufacturer: 'We hereby certify that the material
has been made by an approved process and has been satisfactorily
tested in accordance with DNV Offshore Standards".
Ch.3 Sec.1 B
705 When a material is not produced at the works at which it is
rolled or forged, a certificate shall be supplied by the maker stating
the process of manufacture, the cast number and the chemical composition
of ladle samples. The works at which the material was produced must
be approved.
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