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Ch.2: Technical Provisions [Table of Contents]

DNV-OS-E302 Offshore Mooring Chain

[-] Ch.3: Certification and Classification

CHAPTER 3

Certification and Classification

Ch.3

SECTION 1
Certification and Classification - Requirements

Ch.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, Storage and loading Units 

Ch.3 Sec.1
A 200   Certification and classification principles

Ch.3 Sec.1 A
201   Mooring chain and accessories will be certified or classified based on the following main activities:
—design verification
—approval of manufacturers
—survey during manufacture.

Ch.3 Sec.1
A 300   Assumptions

Ch.3 Sec.1 A
301   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
302   Aspects of the design and construction provisions of this standard which are stated to 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
303   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 400   Documentation requirements

Ch.3 Sec.1 A
401   Documentation requirements shall be in accordance with the NPS DocReq (DNV Nauticus Production System for documentation requirements) and DNV-RP-A201.

Ch.3 Sec.1
B. Certification and 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 correct material and certification. This applies particularly where optional or additional conditions are specified.

Ch.3 Sec.1
B 300   Design verification

Ch.3 Sec.1 B
301   Mooring chain cables and accessories shall be designed according to requirements given in Ch.2 Sec.2 B200 and C200, respectively. Where designs differ from this, the drawings and calculations shall be submitted to DNV for approval.

Ch.3 Sec.1 B
302   Design approval shall be documented by design verification report (DVR), type approval certificate or approval letter.

Ch.3 Sec.1
B 400   Approval of manufacturers

Ch.3 Sec.1 B
401   Materials, chain cables and accessories shall be manufactured at works which have been approved by DNV. Approved manufacturers are published on DNV Exchange on the Internet.

Ch.3 Sec.1 B
402   In order to be approved, the manufacturer shall demonstrate and submit documentation to the effect that the necessary manufacturing, testing and inspection facilities and procedures 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
403   Detailed programmes for approval are given in Standards for Certification No.2.9.

Ch.3 Sec.1
B 500   Survey during manufacture

Ch.3 Sec.1 B
501   Survey during manufacture of mooring chain and accessories shall be based on attending tests and inspections, monitoring manufacturing, and review of records. The scopes of survey are defined in Appendix A and B.

Ch.3 Sec.1 B
502   The scopes defined in Appendix A and B are typical and adjustments may be permitted or required based on considerations such as:
—complexity and size of a delivery
—previous experience with equipment type
—maturity and effectiveness of manufacturer's quality system
—degree of subcontracting.

Ch.3 Sec.1
B 600   Certification of materials

Ch.3 Sec.1 B
601   Rolled steel bars shall be delivered with DNV certificates giving the following particulars for each test unit which has been accepted:
—purchaser's name, order number and vessel identification, where known
—manufacturer's name
—number and dimensions of bars and steel grade
—identification marking of bars
—heat number and chemical composition
—results of mechanical tests
—details of heat treatment of test material
—results of any supplementary and additional test requirements specified.


Ch.3 Sec.1 B
602   Semi-finished steels such as billets, blooms and forged bars intended for chain cable accessories shall be delivered with the manufacturer's certificates giving the following particulars for each test unit which has been accepted:
—purchaser's name, order number and vessel identification, where known
—manufacturer's name
—number and dimensions of semi-finished products and steel grade
—identification marking of products
—heat number and chemical composition
—details of heat treatment
—results of any supplementary and additional test requirements specified.


Ch.3 Sec.1 B
603   Materials for studs shall be delivered with the manufacturer's certificates or test reports.

Ch.3 Sec.1
B 700   Certification of mooring chain and accessories

Ch.3 Sec.1 B
701   Mooring chain and accessories shall be delivered with DNV certificates giving the following particulars for each test unit which has been accepted:
—purchaser's name, order number and vessel identification, where known
—manufacturer's name
—description of products and dimensions
—grade of chain, method of manufacture, condition of supply and reference to material certificate
—identification marking
—results of proof load test, breaking load test and mechanical tests
—confirmation of dimensional measurements and inspections.

Ch.3

APPENDIX A
Scope of Survey for Mooring Chain

Ch.3 App.A (0)
Activity or item Ref in OS Survey Description 
Pre-production meeting NA H - Scope of delivery
- Schedule
- Inspection and test plan
- Works approval status
- Design approval status
- Procedures approval status
- Test machines calibration status 
Materials Ch.2 Sec.1 M/R - Certificates and traceability 
Manufacture Ch.2 Sec.2 B300 M/R - Procedure compliance
- Records 
Welding of studs Ch.2 Sec.2 B400 M/R - Procedure compliance
- Records 
Heat treatment Ch.2 Sec.2 B500 M/R - Procedure compliance
- Records 
Proof load testing Ch.2 Sec.2 B600 W/R - Witness in beginning, then monitoring
- Procedure compliance
- Records 
Breaking load testing Ch.2 Sec.2 B700 H/R - Witness
- Procedure compliance
- Records 
Mechanical testing Ch.2 Sec.2 B800 H/R - Witness
- Procedure compliance
- Records 
Dimensional measurements  Ch.2 Sec.2 B900 M/R - Procedure compliance
- Records 
Inspection Ch.2 Sec.2 B1000 M/R - Procedure compliance
- Records 
Repair Ch.2 Sec.2 B1100 H/M/R - Witness splice link set-up and testing
- Procedure compliance
- Records 
Identification Ch.2 Sec.2 B1200 M/R  
Records (Data book) Ch.2 Sec.2 A500 H/R  

Definitions
Hold point (H) A point where DNV shall be present for supervision or survey. Advance notification to DNV shall be given in writing or any other agreed system of notification. Work shall not proceed beyond a hold point without DNV present or, in exceptional cases where presence is waived, without first obtaining written authorisation from DNV. 
Witness point (W) A point where DNV may be present for supervision or survey, at their discretion. Advance notification to DNV shall be given in writing or any other agreed system of notification. Work may proceed beyond a witness point with or without DNV present.  
Monitoring (M) Intermittent monitoring or surveillance of any stage of the work in progress including, but not limited to, checking compliance with procedures/instructions for manufacture, testing and inspection, observing workmanship, traceability, etc. 
Review (R) Examination of records of activities performed or results achieved.  

Ch.3

APPENDIX B
Scope of Survey for Mooring Chain Accessories

Ch.3 App.B (0)
Activity or item Ref in OS Survey Description 
Pre-production meeting NA H - Scope of delivery
- Schedule
- Inspection and test plan
- Works approval status
- Design approval status
- Procedures approval status
- Test machines calibration status 
Materials Ch.2 Sec.1 M/R - Certificates and traceability 
Manufacture Ch.2 Sec.1  M/R - Procedure compliance
- Records 
Heat treatment Ch.2 Sec.1  M/R - Procedure compliance
- Records 
Proof load testing Ch.2 Sec.2 C300 W/R - Witness in beginning, then monitoring
- Procedure compliance
- Records 
Breaking load testing Ch.2 Sec.2 C400 H/R - Witness
- Procedure compliance
- Records 
Mechanical testing Ch.2 Sec.2 C500 H/R - Witness
- Procedure compliance
- Records 
Dimensional measurements  Ch.2 Sec.2 C600 M/R - Procedure compliance
- Records 
Inspection Ch.2 Sec.2 C700 M/R - Procedure compliance
- Records 
Repair Ch.2 Sec.2 C800 M/R - Procedure compliance
- Records 
Identification Ch.2 Sec.2 C900 M/R  
Records (Data book) Ch.2 Sec.2 A500 H/R  

Definitions
Hold point (H) A point where DNV shall be present for supervision or survey. Advance notification to DNV shall be given in writing or any other agreed system of notification. Work shall not proceed beyond a hold point without DNV present or, in exceptional cases where presence is waived, without first obtaining written authorisation from DNV. 
Witness point (W) A point where DNV may be present for supervision or survey, at their discretion. Advance notification to DNV shall be given in writing or any other agreed system of notification. Work may proceed beyond a witness point with or without DNV present.  
Monitoring (M) Intermittent monitoring or surveillance of any stage of the work in progress including, but not limited to, checking compliance with procedures/instructions for manufacture, testing and inspection, observing workmanship, traceability, etc. 
Review (R) Examination of records of activities performed or results achieved.  

Sec.2: Mooring Chain Cables and Accessories [Table of Contents]