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Ch.2: Technical provisions [Table of Contents]

DNV-OS-E101 Drilling plant

[-] Ch.3: Certification and Classification

CHAPTER 3

Certification and Classification

Ch.3

SECTION 1
Introduction

Ch.3 Sec.1
A. General

Ch.3 Sec.1
A 100   Organisation of Chapter 3 of the standard

Ch.3 Sec.1 A
101   Ch.3 is divided into 3 main sections:
Sec.1; Introduction: Explains how this standard shall be applied in connection with offshore certification and classification.
Sec.2; Documentation requirements: Identifies specific requirements to be applied when using this standard for certification or classification purposes, as well as stating corresponding documentation requirements.
Sec.3; System and equipment certification: States certification requirements for systems and equipment in certified or classified drilling plants and gives a criticality ranking of such equipment.

Ch.3 Sec.1
A 200   Introduction

Ch.3 Sec.1 A
201   As well as representing DNV's interpretation of 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
202   A complete description of principles, procedures, applicable class notations and technical basis for offshore classification is given by Offshore Service Specifications, see Table A1.

Ch.3 Sec.1 A
Table A1 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
203   Classification procedures and requirements specifically applicable in relation to the technical provisions in Ch.2 are given in Ch.3 of this offshore standard.

Ch.3 Sec.1 A
204   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
A 300   Certification and classification principles

Ch.3 Sec.1 A
301   Drilling plants will be certified or classified based on the following main activities:
—design verification
—fabrication survey and equipment certification
—survey during installation and commissioning.

Ch.3 Sec.1
A 400   Class designation

Ch.3 Sec.1 A
401   Offshore units and installations fitted with drilling plants which have been designed, constructed and installed in accordance with the requirements of this standard under the supervision of DNV will be entitled to the class notation DRILL.

Ch.3 Sec.1 A
402   DNV may accept decisions by national authorities as basis for assigning class.

Ch.3 Sec.1
A 500   Assumptions

Ch.3 Sec.1 A
501   Classification is based on the assumption that the drilling plant will be properly maintained and operated by qualified personnel, that operational and testing procedures are followed and that loads and environmental conditions during operation will be within the specified design limits.

Ch.3 Sec.1 A
502   Any deviations, exceptions and modifications to the design codes and standards given as recognised reference code shall be documented and approved by DNV.

Ch.3 Sec.1 A
503   Where codes and standards do not call for specific extent of critical inspection and testing, agreed testing or inspection scope between contractor or manufacturer and purchaser shall be agreed with DNV.

Ch.3

SECTION 2
Documentation Requirements

Ch.3 Sec.2
A. Documentation Requirements

Ch.3 Sec.2
A 100   General

Ch.3 Sec.2 A
101   Documentation for classification shall be in accordance with the Nauticus Production System (NPS) Document Requirement (Doc.Req.). The Doc.Req is a compilation of all DNV's documentation requirements related to plan approval.

The documentation requirements are based on standardised documentation types. Definitions of the documentation types are given in DNV-RP-A201.



Ch.3 Sec.2 A
102   In addition to the documentation indicated in 101, the documentation requirements of discipline specific standards referenced in this standard shall be provided, avoiding duplication.

Ch.3 Sec.2 A
103   For essential systems and functions, see Ch.2 Sec.1 Table B1, an FMEA or similar shall be submitted DNV for review.

Ch.3

SECTION 3
System and Equipment Certification

Ch.3 Sec.3
A. General

Ch.3 Sec.3
A 100   System categorisation

Ch.3 Sec.3 A
101   Drilling systems are categorised as essential, important or non-important systems, as stated in Ch.2 Sec.1. All essential and important systems shall fulfil the requirements of this standard or other recognised standards. Other recognised standards may only be used provided that they can be clearly shown to provide a comparable or higher level of safety for the installation, system or equipment than would have been provided under the requirements of this standard. For non-important systems, the principles of this standard may be applied in the absence of other recognised standards.

Ch.3 Sec.3
A 200   Equipment categorisation

Ch.3 Sec.3 A
201   DNV uses categorization in order to clearly identify the certification and approval requirements for different equipment and components.

Ch.3 Sec.3 A
202   Categorization of equipment depends on importance for safety and takes operating and environmental conditions into account. Once assigned, the category of equipment refers to the scope of activities required for DNV certification and approval, as consistent with the importance of the equipment.

Ch.3 Sec.3 A
203   If there are any other equipment which is not defined in the following tables, categorization of the same shall be decided on a case by case basis with prior discussion with DNV.

Ch.3 Sec.3 A
204   Electrical equipment like motors, transformers, converters, etc. are not categorized here. All electrical equipment necessary for operation of components in category I, shall be certified if certification of such equipment is required in DNV-OS-D201.

Ch.3 Sec.3 A
205   Equipment categorisation for offshore installations or units is as follows:
I = equipment important for safety and for which a DNV certificate is required. 
II = equipment important for safety and for which a works certificate prepared by the manufacturer is accepted. 



Ch.3 Sec.3 A
206   Equipment category I

For equipment category I, the following approval procedure shall be followed:
—design approval, documented by a design verification report (DVR) or type approval certificate. (see C100)
—fabrication survey, documented by issue of a product certificate.

Specific requirements:
—pre-production meeting prior to the start of fabrication
—survey during fabrication, as applicable
—witness final functional, pressure and load tests, as applicable
—review of fabrication records.

These requirements are typical and the final extent of DNV survey required, will be decided based on:
—complexity, size and previous experience of equipment type;
—manufacturer's QA/QC system,
—manufacturing survey arrangement (MSA) with DNV
—type of fabrication methods.


Ch.3 Sec.3 A
207   Equipment category II

Equipment of category II is normally acceptable on the basis of a works certificate prepared by the manufacturer. As a minimum, the certificate shall contain the following data:
—equipment specification or data sheet
—operating limitation(s) of the equipment
—statement from the manufacturer to confirm that the equipment has been constructed and manufactured according to recognised methods, codes, and standards
—test records as applicable.

Ch.3 Sec.3
A 300   Certification and classification principles

Ch.3 Sec.3 A
301   General DNV certification procedures and requirements are stated in the relevant DNV offshore service specification (see Sec.1 Table A1).

Ch.3 Sec.3 A
302   Categorization of relevant systems and equipment covered by DRILL and DRILL(N) notations are given in Table A1 to Table A11.

Ch.3 Sec.3 A
303   Categorization of relevant systems and equipment covered by WELL and WELL(N) notations are given in Table A12. In addition, Table A1 to Table A11 shall be followed for categorization of applicable systems and equipment covered by WELL and WELL(N) notations.

Ch.3 Sec.3 A
Table A1 Drilling structures 
 Material or equipment DNV approval categories 
I II 
Drilling structures Derrick and other drilling tower designs X  
Other design X  
Miscellaneous Skids and lifting brackets intended for installation lifts  X 
Skids and lifting brackets intended for regular lifts X  

Ch.3 Sec.3 A
Table A2 Well control systems 
 Material or equipment DNV approval categories 
I II 
Blowout prevention
equipment 		Hydraulic connectors for wellhead and riser X  
Ram preventers X  
Annular preventers X  
Accumulators for subsea stack X  
Subsea fail-safe valves in choke and kill lines X  
Clamp X  
Test stump X  
BOP test pump  X 
Valves in drillstring X  
Blowout prevention, control equipment Accumulators in control system X  
Welded pipes and manifolds 1) X  
Unwelded hydraulic piping  X 
Flexible control hoses  X 
Hydraulic hose reel  X 
Control pods X  
Acoustic BOP control equipment X  
Diverter unit, equipment
and control equipment 		Diverter house with annular valve X  
Diverter piping 1) X  
Valves in diverter piping X  
Diverter handling tool X  
Choke and kill, equipment and control equipment Choke manifold 1) X  
All piping to and from choke manifold including choke, kill, and booster lines X 1)  
Flexible hoses for choke, kill, and booster lines X  
Unions and swivel joints X  
Emergency circulation pump - pressure side X  
Marine riser, equipment
and control equipment 		Ball joint and flexible joint X  
Riser sections including joints X  
Support ring for riser tensioning X  
Riser Spider & Gimbal X  
Riser Handling and Running Tools X  
Telescopic joint X  
Accumulators  X  
  1. Certification shall cover system design, manufacture and testing. Requirements to individual piping components; see Table A9.
 

Ch.3 Sec.3 A
Table A3 Heave compensation and tensioning systems 
 Material or equipment DNV approval categories 
I II 
General Hydraulic cylinders and other pressure vessels 1) X  
Piping including flexible hoses 2) X  
Hydro-pneumatic accumulators X  
Air compressors and air dryers  X 
Wire ropes   X 
Sheaves  X 
Heave compensation  Heave compensator system assembly X  
Load carrying parts in compensator system X  
Deadline compensator X  
Tensioning systems Riser tensioner system assembly X  
Load carrying parts in tension system X  
Guidelines and podline tensioners/tension winches X  
Telescopic arms for tension lines X  
Tripsaver skid/trolley X  
Air control skid with manifold  X 
Anti-recoil valve X  
Swivels and goosenecks on tension cylinders 1) X  
  1. See Table A10.
  2. Certification shall cover system design, manufacture and testing. Requirements to individual piping components; see Table A9.
 

Ch.3 Sec.3 A
Table A4 Hoisting and rotating systems 
 Material or equipment DNV approval categories 
I II 
Conventional hoisting system Sheaves for crown block and travelling block X  
Crown block including support beams X  
Guide track and dolly X  
Travelling block X  
Draw works including foundation X  
Deadline anchor X  
Hydraulic cylinder based hoisting system
(ramrig/cylinder hoisting rig) 		Lifting cylinders (rams) X  
Yoke X  
Yoke sheaves X  
Sheave clusters including support beams X  
Guide track and dolly X  
Equalizers X  
Deadline anchor X  
Hoisting equipment in
derrick 		Drilling hook 1) X  
Swivel 1) X  
Links X  
Spiders X  
Elevators X  
Elevator bushing/insert   X 
Drilling line and sand line  X 
Cranes in derrick X  
Rotating equipment Rotary table including skid adaptor and driving unit X  
Kelly with kelly cock arrangement 1)  X 
Master bushing  X 
Kelly bushing 1)  X 
Topdrive 1) X  
  1. Other types of equipment having similar function as the ones listed above are to be equally categorised.
 

Ch.3 Sec.3 A
Table A5 BOP and pipe handling 
 Material or equipment DNV approval categories 
I II 
Pipe handling Racking arms including possible lifting head X  
Manipulator arms X  
Guide track and dolly X  
Catwalk  X  
Horizontal to vertical (HTV) equipment X  
Pipe handling Crane incl. Gripper yokes X  
Finger board incl. belly board X  
Mousehole (If powered, cat I will apply) X X 
BOP & Xmas tree handling Blowout preventer crane or carrier, skid, guide frame, sea fastening, etc.  X  
Miscellaneous Power tongs for pipe handling or iron roughneck  X 
Kelly spinner  X 
Power slips  X 

Ch.3 Sec.3 A
Table A6 Bulk storage, drilling fluid circulation and mixing and cementing 
 Material or equipment DNV approval categories 
I II 
Bulk storage Pressurised storage tanks 1)  X  
Piping for pressurised bulk transport 2)   X 
Safety valves 3) X  
Pumps for bulk transport  X 
Drilling fluid circulation
and mixing 		Drilling fluid pump - pressure side X  
Standpipe manifold X  
Pulsation dampers X  
Circulation head piping including drilling fluid pump discharge 2) X  
Mud hoses X  
Safety valves 3) X  
Piping for mixing of drilling fluid, and suction line to drilling fluid pump 2)  X 
Centrifugal pumps for mixing / transfer of drilling fluid  X 
Rotary hose assembly X  
Kelly cocks X  
Drill string  X 
Mud return pipe 2)  X 
Shale shaker  X 
Drilling fluid tanks  X 
Degasser including piping to burners or to vents 1)and 2)  X X 
Chemical mixers  X 
Agitators for drilling fluid  X 
Cementing Cement pump - pressure side X  
Cementing head X  
Cement manifold X  
Pulsation dampers X  
Circulation head piping including cement pump discharge 2) X  
Cement hoses X  
Safety valves 3) X  
Centrifugal pumps for cement mixing / transfer of cement slurry  X 
Piping for mixing of cement, and suction line to cement pump 2)  X 
  1. See Table A10.
  2. Certification shall cover system design, manufacture and testing. Requirements to individual piping components; see Table A9.
  3. Design review of valve and bursting disc is not required. The extent of witnessing of leak-, calibration-, capacity- and qualification- testing to be agreed with DNV based on manufacturer's QA/QC system. DNV shall normally witness batch qualification tests of bursting discs.
 

Ch.3 Sec.3 A
Table A7 Well test systems 
 Material or equipment DNV approval categories 
I II 
Well test systems Piping including flexible hoses 1) X  
Pressure vessels and separators 2) X  
High pressure pumps - pressure side X  
Other pumps  X 
Burners X  
Flare booms X  
Safety valves 3) X  
  1. Certification shall cover system design, manufacture and testing. Requirements to individual piping components; see Table A9.
  2. See Table A10.
  3. Design review of valve and bursting disc is not required. The extent of witnessing of leak-, calibration-, capacity- and qualification- testing to be agreed with DNV based on manufacturer's QA/QC system. DNV shall normally witness batch qualification tests of bursting discs.
 

Ch.3 Sec.3 A
Table A8 Other systems 
 Material or equipment DNV approval categories 
I II 
Winches Winches for lifting purposes X  
Winches for non-lifting purposes  X 
Man riding equipment Man riding winches, access boards or baskets, etc. X  
Miscellaneous Hydraulic power units including pumps and manifolds  X 
Skids or carriers for handling of equipment at height or over moon pool X  
Rails for cranes, skids and other equipment  X 
Non-redundant gear transmission and brakes for critical applications X  

Ch.3 Sec.3 A
Table A9 Categories for pipes, fitting and valves in drilling systems 
 Material or equipment DNV approval categories 
I II 
Piping systems
(including spools) 		Piping listed in DNV-RP-D101 Sec.3.15.6, Pipe Stress Priority Piping X  
All other piping NOT listed in DNV-RP-D101, section 3.15.6  X 
Flanges and couplings Standard flanges and pipe couplings  X 
Non-standard flanges and pipe couplings used in category I piping systems  X  
Flanges and pipe couplings other than those mentioned above, and flanges and couplings for category II piping system  X 
Flexible hoses Flexible hoses for systems requiring continuous operation and for which failure of flexible hose is considered critical. X  
Valves Valve body of welded construction with ANSI rating > 600 lbs X  
Valves designed and manufactured in accordance with recognised standards  X 
Components of high strength materials 1) Specified yield strength > 345 Mpa (50 000 psi), or tensile strength > 515 Mpa (75 000 psi) X  
  1. Components made according to recognised standard where the material requirements allow use of high strength steel may be accepted as category II.
 

Ch.3 Sec.3 A
Table A10 Categories for pressure vessels 
 Material or equipment DNV approval categories 
I II 
Pressure vessels for Poisonous liquids X  
Liquids with flash point below 100°C X  
Liquids with temperature above 220°C X  
Compressed gases, where pressure ´volume (P ´ V) is above 1.5, where pressure (P) is in bar and volume (V) is in m3 X  
Other Pressure vessels that are not included in category I  X 
Cylinders Cylinders for lifting purposes X  
Cylinders for non-lifting purposes  X 

Ch.3 Sec.3 A
Table A11 Categories for control systems 
 Material or equipment DNV approval categories 
I II 
Control systems Blowout prevention (BOP) X  
Diverter X  
Choke & Kill X  
Marine riser equipment X  
Heave compensating X  
Active heave draw work X  
Riser tension X  
Other systems 1) X X 
  1. Categorization will depend on criticality of the system, i.e. whether any potential failures are considered to be critical or not.
 

Ch.3 Sec.3 A
Table A12 Categories for workover and well intervention systems and equipment 
 Material or equipment DNV approval categories 
  I II 
Wire line Wire line unit including power pack  X 
Wire line BOP X  
Grease injection skid for braided line and stuffing box for slick line X  
Line pressure control head X  
Wire line winch  X 
Coiled tubing Coiled tubing unit including power pack  X 
Coiled tubing BOP X  
Coiled tubing reel  X 
Injector head  X 
Coiled tubing stripper X  
Workover riser
(mono or dual bore) 		Riser sections including joints X  
Telescopic joint X  
Ball joint and flexible joint X  
Swivel X  
Support ring for riser tensioning X  
Blowout prevention
equipment 		Emergency Disconnect Package (EDP)1) X  
Lower Riser Package (LRP) 1) X  
General systems
and equipment 		Surface flow tree X  
Lubricator valve X  
Subsea test tree X  
Tension frame and/or bails X  
Lifting tower and well-servicing derrick X  
Lifting equipment X  
High pressure pumping facilities (cement, well stimulation fluids, nitrogen, chemical injection) X  
Flexible hoses for choke & kill operations and chemical injection  X  
Hydrocarbon handling X  
Workover control system X  
Umbilicals for subsea controls  X 
  1. See Table A2.
 

Ch.3 Sec.3
B. Fabrication Record

Ch.3 Sec.3
B 100   General

Ch.3 Sec.3 B
101   Fabrication record shall be maintained by the manufacturer in a traceable manner, so that relevant information regarding design specifications, materials, fabrication processes, inspection, heat treatment, testing, etc. can be checked.

Ch.3 Sec.3 B
102   Fabrication record for category I equipment shall be available for review. The following particulars shall be included, as applicable:
—manufacturer's statement of compliance
—reference to design specifications and drawings
—location of materials and indication of respective material certificates
—welding procedure specifications and qualification test records
—location of weldings indicating where the particular welding procedures have been used
—heat treatment records
—location of non-destructive testing (NDT) indicating where the particular NDT method has been used and its record
—load, pressure and functional test reports
—as-built part numbers and revisions.

Ch.3 Sec.3
C. Documentation Deliverables
for Certification of Equipment

Ch.3 Sec.3
C 100   General

Ch.3 Sec.3 C
101   The following documentation will normally be issued by DNV for equipment and systems covered by certification activities (CMC):

a) Design verification report, (DVR)
—DVR will be issued by the design approval responsible for all equipment of category I, unless covered by a valid type approval certificate.
—In addition to each individual equipment, DVRs shall be issued for each system (including control systems) not covered by plan approval.

The DVR shall contain all information needed to be followed up by the surveyor attending fabrication survey and installation of the equipment, and as a minimum include:
—design codes and standards used for design verification
—design specification (e.g. temperature, pressure, SWL, etc.)
—follow-up comments related to e.g. testing, fabrication and installation of the equipment or system.

An approval letter may be issued instead of a DVR, however such a letter shall as a minimum contain the same information as listed above.

b) Inspection release note, (IRN)
—An IRN shall only be issued if the component is delivered prior to issuance of final product certificate (PC). A final PC shall not be issued if there are non-conformances to the equipment or system. The IRN shall be used with detailed description of the non-conformances, and shall always be replaced by a certificate when all non-conformances are closed.

c) Product certificate, (PC)
—PC should be issued for all category I equipment and systems (including control systems)
—PC will be issued upon successful completion of design verification, fabrication survey and review of final documentation. As stated above, PC can not be issued if design verification or non-conformances are outstanding.

d) Survey report
—Survey report shall be issued for all category I equipment or systems (including control systems) upon satisfactory installation, survey and testing onboard. A survey report may cover several systems or equipment installed. The survey report shall contain clear references to all DVRs and PCs on which the survey report is based, and shall state testing and survey carried out.

Sec.7: Manufacture, Workmanship and Testing [Table of Contents]