Witherbys.com
Guidelines for the Purchasing and Testing of SPM Hawsers - Second Edition 2025
£85.00
This publication provides detailed guidance on the specification, purchasing, testing and design particulars of mooring hawsers.
The second edition includes rope design particulars and documents including the Offer of Hawser Form and the OCIMF Compliance Certificate ensuring rope manufacturers, purchasers and inspectors have the latest guidance and information.
The second edition includes key purchaser information, such as rope size, rope performance and hawser assembly instructions. The packing of hawsers and rope dimensions are illustrated through detailed technical drawings. Each inspection process step is fully explained and supported by checklists and reports. The Appendices include new electronic checklists and forms which cover key definitions for rope design and quality assurance terminology.
This edition of the Guidelines for the Purchasing and Testing of SPM Hawsers has been rewritten by an OCIMF working group. Sections that were previously indicated by a letter are now indicated by a number. (Part A has become section 1, Part B has become section 2 and so on.) In section 1 the actions and expectations on both purchaser and manufacturer have been sorted to group them together for the purchaser and to group them together for the manufacturer.
The working group compiled a questionnaire that was sent to manufacturers through The Cordage Institute, an international association of rope, twine, and related manufacturers, their suppliers, and affiliated industries. The replies received were used to update the relevant parts of this 2nd edition.
New figures have been added to help visualise and clarify what is meant in the corresponding text and all formulas, while still valid, were recalculated.
Section 7 - Manufacturer?s Record Book is a new addition that describes the minimum level of information and guidance that the purchaser should expect to receive from the manufacturer about storage, operations, inspection and maintenance of a hawser throughout its lifecycle. Instructions about post-lifecycle testing should be included.
The checklists found in the previous edition have been restyled and have also been made available in electronic format.
It is important to note that the word 'shall' used in the previous edition of the guidelines has been replaced by 'should'. The purchaser, and in particular their purchasing department, should be made aware that when the procedures laid down and recommended in this edition are to be applied, this should be clearly communicated to the manufacturer.
Introduction
Contents
Purpose and scope
Glossary
Abbreviations
Bibliography
List of figures
Section one
General practices and procedures
1.1 General procedures
1.2 Purchasing and testing - process overview
1.3 Compliance with OCIMF Guidelines for the Purchasing and Testing of SPM Hawsers
1.4 OCIMF Compliance Certificate
1.5 Other practices
Section two
Procedure for specifying hawsers
2.1 General procedures
2.2 Rope size
2.3 Rope performance
2.4 Rope construction
2.5 Rope fibre material
2.6 Hawser assembly
2.7 Eyes and thimbles
2.8 Chafe protection
2.9 Auxiliary gear
2.10 Hawser length
2.11 Marking of hawsers
2.12 Packing of hawsers
Section three
Procedure for offering hawsers
3.1 General procedures
3.2 Rope size
3.3 Rope performance
3.4 Rope construction
3.5 Rope fibre material
3.6 Hawser assembly
3.7 Marking and packing
Section four
Production of hawsers
4.1 General procedures
4.2 Product design documentation
4.3 Rope fibre material quality
4.4 Material control
4.5 Material testing
4.6 Rope production
4.7 Splice quality
4.8 Hawser assembly, eyes, thimbles, chafe protection and auxiliary gear
4.9 Identification and labelling of rope
4.10 Packing
Section five
Inspection of finished hawsers
5.1 General procedures
5.2 Establishment of inspection criteria
5.3 Manufacturing quality
5.4 Application of reference load
5.5 Inspection of sample of rope section
5.6 Verification of rope strength
5.7 Fibre material identification testing
5.8 Inspection at reference load
5.9 Inspection of splices
5.10 Rope quality
5.11 Eyes, thimbles, chafe protection and auxiliary gear
5.12 Markings
5.13 Packing
Section six
Production of prototype ropes
6.1 General procedures
6.2 Intent of prototype testing
6.3 Inspection by Independent Inspector
6.4 Number of tests
6.5 Prototype rope description
6.6 Test machine
6.7 New Dry Breaking Strength Test
6.8 New Wet Breaking Strength Test
6.9 Breaking strength calculations
6.10 Cyclic Load Test
6.11 Elongation measurements and extension calculation
6.12 Auxiliary gear - reserve buoyancy test
6.13 Reporting of results
Section seven
Manufacturer's Record Book
7.1 General
7.2 Detailed rope information
7.3 Requirements for hawser Residual Strength testing
Appendices
Appendix A: Forms
Form A OCIMF Guidelines for the Purchasing and Testing of SPM Hawsers Compliance Certificate
Form B Purchase Specification Form
Form C Offer of Hawser Form
Form D-1 Yarn Specification Form
Form D-2 Rope Quality Control Checklist
Form E Inspection Checklist and Report
Form F Prototype Test Checklist and Report
Appendix B: Basic yarn testing
B1 Yarn strength and elongation
B2 Yarn shrinkage and creep
B3 Yarn-on-yarn abrasion test
B4 Fibre material identification tests
Appendix C: Example calculations
C1 Introduction
C2 Rope Size Number (section 5.5.4)
C3 Verification of rope strength (section 5.6.4)
C4 Standard Deviation (section 6.9.3)
C5 Wet Strength Ratio (section 6.9.4)
C6 Rope Strength/Size Scale Power (section 6.9.5)
C7 Determination of strengths of other rope sizes (section 6.9.6)
C8 Determination of Rope/Yarn Strength Ratio (section 6.9.7)
C9 Determination of Thousand Cycle Load Level (section 6.10.8)
The Oil Companies International Marine Forum (OCIMF) is a voluntary association of oil companies with an interest in the shipment and terminalling of crude oil, oil products, petrochemicals and gas. OCIMF focuses exclusively on preventing harm to people and the environment by promoting best practice in the design, construction and operation of tankers, barges and offshore vessels and their interfaces with terminals. Learn more at: www.ocimf.org
- Number of Pages:
- 118
- Published Date:
- March 2025
- Book Height:
- 303 mm
- Book Width:
- 230 mm
- Publication Date:
- March 2025
- Author:
Oil Companies International Marine Forum (OCIMF)
- Weight:
- 1.1 kg
- ISBN:
- 9781917308335
