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Ch.2: Technical Provisions [Table of Contents]

DNV-OS-E304 Offshore Mooring Steel Wire Ropes

[-] 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 and Storage Units  

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

Ch.3 Sec.1 A
201   Mooring steel wire ropes and sockets 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 steel wire ropes and sockets shall be designed according to requirements given in Ch.2 Sec.3. 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   Steel wire ropes and sockets 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 steel wire ropes and sockets shall be based on attending tests and inspections, monitoring manufacturing, and review of records.

Ch.3 Sec.1
B 600   Certification of sockets

Ch.3 Sec.1 B
601   Sockets shall be delivered with DNV certificates giving the following particulars for each test unit which has been accepted:
—purchaser's name, order number and unit identification, where known
—manufacturer's name
—number and dimensions of sockets
—identification marking of sockets
—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 700   Certification of mooring steel wire ropes

Ch.3 Sec.1 B
701   Mooring steel wire ropes shall be delivered with DNV certificates giving the following particulars for each test unit which has been accepted:
—purchaser's name, order number and unit identification, where known
—manufacturer's name
—description of products and dimensions
—type of wire rope construction and method of manufacture
—surface sheathing (if relevant)
—identification marking
—results of break load test and mechanical tests
—confirmation of dimensional measurements and inspections


Ch.3 Sec.1 B
702   Materials for wires shall be delivered with the manufacturer's certificates or test reports.
Sec.8: Identification and Records [Table of Contents]