Hawser Test Report (eBook)

Look Inside

Published Date

January 1982


Also available in other formats:

Hawser Test Report (eBook)

$65.92
(Excludes any applicable taxes)

This book covers the first in-depth tests to determine the actual new and used strengths and rate of strength reduction of large synthetic ropes, such as those used as SBM/SPM mooring hawsers.

Be the first to review this product

This book provides a complete description of the first major large rope testing programme. This was undertaken to determine new and used strengths and the rate of strength reduction for large synthetic ropes, similar to those used as SPM Hawsers. All of the test data and analyses are included, together with conclusions and recommendations.

 


1. INTRODUCTION

2. SUMMARY

TEST NEW PROGRAMME DESCRIPTION

NEW BREAKING STRENGTHS

CYCLES TO FAILURE

ELASTICITY AND OTHER OBSERVATIONS

USED HAWSER TEST RESULTS

PRINCIPAL RECOMMENDATIONS AND CONCLUSIONS

PART 1 TEST DATA

3. GENERAL DESCRIPTION OF ROPE TESTS

TEST SPECIMENS

TEST EQUIPMENT

TEST PLANS AND PROCEDURES

4. SMALL ROPE TEST RESULTS

STRAIGHT BREAK TESTS, SERIES 1A

SPECIAL CYCLIC LOAD TESTS, SERIES 1B

SINGLE LEG CYCLIC LOAD TESTS, SERIES 1C

STROP CYCLIC LOAD TESTS, SERIES 1D

PSEUDO RANDOM CYCLIC LOAD TESTS, SERIES 1E

5. LARGE ROPE TEST RESULTS

STRAIGHT BREAK TESTS, SERIES 2A

SINGLE LEG CYCLIC LOAD TESTS, SERIES 2C

STROP CYCLIC LOAD TESTS, SERIES 2D

PSEUDO RANDOM CYCLIC LOAD TESTS, SERIES 2E

PART 2 DATA ANALYSIS

6. ANALYSIS OF NEW ROPE STRENGTHS

COMPARISON OF NDBS WITH RATED STRENGTH

STATISTICAL VARIATION OF NEW STRENGTH

CHOICE OF 5% AS STANDARD DENATION

CHOICE OF NDBS FOR DATA ANALYSIS

WET STRENGTH FACTOR

STROP EFFICIENCY FACTOR

7. ANALYSIS OF CYCLES TO FAILURE

SMALL SINGLE LEG DATA

LARGE SINGLE LEG DATA

SMALL AND LARGE STROP DATA

INFLUENCE OF ROPE SIZE

CYCLES TO FAILURE OF WET ROPE

STATISTICAL VARIATION

RECOMMENDED CYCLES TO FAILURE LINE

PRECAUTIONS ON USING THIS TECHNIQUE

8. ANALYSIS OF RESIDUAL STRENGTH

RESIDUAL STRENGTH FORMULA

RESIDUAL STRENGTH STATISTICAL VARIATION

SMALL SINGLE LEG DATA

LARGE SINGLE LEG DATA

RESIDUAL STRENGTH SURFACE

9. ANALYSIS OF CUMULATIVE STRENGTH REDUCTION

THE RESIDUAL STRENGTH METHOD

EXAMPLE RESIDUAL STRENGTH CALCULATION

TWO SIMILAR TEST CASES

OTHER TEST CASES

RESIDUAL STRENGTH METHOD OF PROMISING BUT NOT PROVEN

FURTHER INVESTIGATION OF THE METHOD IS NECESSARY

10. ANALYSIS OF ELASTICITY

USED ROPE ELASTICITY

CHANGE IN ELASTICITY WITH CYCLING

CHANGE IN ELASTICITY AT VARIOUS LOAD LEVELS

ELONGATION AT FAILURE

OTHER ELONGATION OBSERVATIONS

11. OTHER ANALYSIS AND OBSERVATIONS

LOCATION OF SINGLE LEG BREAKS

LOCATION OF STROP BREAKS

PHYSICAL APPEARANCE OF ROPE BEFORE BREAK

PHYSICAL APPEARANCE AFTER BREAK

NOISES MADE DURING CYCLING

TRAJECTORY OF BROKEN ROPE

RATE OF LOADING

TEMPERATURE MEASUREMENTS

PART III USED HAWSER TESTS

12. USED HAWSER TESTING

SELECTION OF USED HAWSERS FOR TESTING

MOORING LOAD RECORDS

GENERAL TEST PROCEDURES

TEST RESULTS

13. USED HAWSER TEST DETAILS

TEST 3-1 HAWSER DESCRIPTION

TEST 3-1 RESULTS

TEST 3-2 AND 3-4 HAWSER DESCRIPTION

TEST 3-2 AND 3-4 RESULTS

TEST 3-3 HAWSER DESCRIPTION

TEST 3-3 RESULTS

TEST 3-5 HAWSER DESCRIPTION

TEST 3-5 RESULTS

TEST 3-6 HAWSER DESCRIPTION

TEST 3-6 RESULTS

14. ANALYSIS OF USED HAWSER RESULTS

PRETEST INSPECTION

OTHER CAUSES OF FAILURE

CYCLES TO FAILURE ANALYSIS

RESIDUAL STRENGTH

PART IV NEW HAWSER STRENGTH

15. NEW HAWSER STRENGTH

LARGE HAWSER STRENGTH MAY BE LESS THAN 80% OF RATED STRENGTH

STRENGTH OF LARGE HAWSERS CAN BE IMPROVED

STRENGTH OF 6% BELOW AVERAGE HAS 10% PROBABILITY

STANDARD AND INSPECTION PROCEDURES SHOULD BE DEVELOPED

NEW STROP STRENGTH EFFICIENCY FACTOR IS 1.7

NEW WET STRENGTH FACTOR IS 80% FOR NYLON

16. STRENGTH AND LIFE OF USED HAWSERS

CYCLES OF FAILURE MAY BE REPRESENTED AS LOGARITHMIC FUNCTION

BROKEN-IN NYLON ROPES LOSE 10% STRENGTH WHEN WET

STATISTICAL VARIATION OF CYCLES TO FAILURE IS LARGE

RESIDUAL STRENGTH IS NON-LINEAR FUNCTION OF CYCLES

CUMULATIVE STRENGTH REDUCTION MAY BE PREDICTED

LIFE OF STROPS AND SINGLE LEG ROPES MAY BE ABOUT SAME

17. FUTURE INVESTIGATION

EXTENSION OF CTF LINE TO LOW LOAD LEVELS

EFFECT OF SOAKING ON WET STRENGTH AND LIFE

COMPARISON OF VARIOUS NYLONS

COMPARISON OF OTHER MATERIALS AND CONSTRUCTIONS

DEVELOPMENT OF Q.C. AND INSPECTION CRITERIA

FIELD MEASUREMENTS AND HAWSER RESIDUAL STRENGTH TESTS

APPENDICES

A DESCRIPTION OF TEST EQUIPMENT

SHORT ROPE TEST MACHINE (SRTM)

SHORT LARGE ROPE TEST MACHINE (SLRTM)

LONG LARGE ROPE TEST MACHINE (LLRTM)

RECORDING SYSTEM

B BALANCE OF LOADS BETWEEN CORE AND COVER

INTRODUCTION – TWO SOURCES OF UNBALANCED LOADS

SUMMARY- UNBALANCED LOAD MUCH MORE SIGNIFICANT IN SHORT ROPES

UNEQUAL LENGTHS, LINEAR STRENGTHS

UNEQUAL LENGTHS, NONLINEAR SPRINGS

POTENTIAL FORCE IMBALANCE IS GREATER FOR SHORTER ROPES

UNBALANCED LOAD DUE TO CHANGE IN STIFFNESS, LINEAR SPRINGS

UNEQUAL ELASTICITIES DUE TO STIFFNESS OF SPLICE, NONLINEAR SPRINGS

LOAD IMBALANCE DUE TO STIFFENING IS INDEPENDENT OF LOAD LEVEL

RELATIVE MOVEMENT AT TRANSITION OF STIFFNESS

MOVEMENT AT JUNCTION ESSENTIALLY INDEPENDENT OF LENGTH OF ROPE

C ANALYSIS OF THE WERTH SMALL ROPE TEST RESULTS

TEST SPECIMENS

TEST PROCEDURES AND PROGRAM DESCRIPTION

ANALYSIS OF DOUBLE-BRAID ROPE DATA

ANALYSIS OF EIGHT-STRAND ROPE DATA

COMPARISON OF EIGHT-STRAND POLYESTER AND DOUBLE-BRAID NYLON

OTHER ANALYSIS OF WERTHS STROP DATA

D OTHER RESEARCH ON STRENGTH REDUCTION OF SYNTHETIC ROPES

COMPARISON OF “WET” AND DRY CYCLIC LOAD TESTS

DISCUSSION OF VAN LEEUWEN TEST RESULTS

DISCUSSION OF BITTING ROPE TEST RESULTS

BUNSELL TYPE FIBER FATIGUE

THE NYLON ROPE CTF CURVE MAY BE S SHAPED

APPENDIX D REFERENCES

OCIMF was formed in April 1970 in response to the growing public concern about marine pollution, particularly by oil, after the Torrey Canyon incident in 1967. In the early 1970s, a variety of anti-pollution initiatives were starting to emerge nationally, regionally and internationally, but with little coordination. Through OCIMF, the oil industry was able to play a stronger, coordinating role in response to these initiatives, making its professional expertise widely available through cooperation with governments and intergovernmental bodies.

OCIMF was granted consultative status at the IMO in 1971 and continues to present oil industry views at IMO meetings. Since then, its role has broadened to take account the changing maritime activities of its membership. Its remit now covers tankers, barges, offshore support vessels and terminals and its advice extends to issues like shipping in ice and large-scale piracy, which rarely troubled the oil industry when OCIMF was first created in the 1970s.

The current membership of OCIMF comprises 112 companies worldwide.

Today, OCIMF is widely recognised as the voice of the oil industry providing expertise in the safe and environmentally responsible transport and handling of hydrocarbons in ships and terminals and setting standards for continuous improvement. Membership is extensive and includes every oil major in the world along with the majority of National Oil Companies.

OCIMF has much to be proud of. Not only has it contributed to a substantial quantity of regulation at the IMO aimed at improving the safety of tankers and protecting the environment, but it has introduced important new guidance on pressing current issues such as piracy and Arctic shipping. With the process of introducing new Internationally-accepted regulation necessarily slow as it crosses many individual countries and jurisdictions, OCIMF is in the unique position of being able to leverage the expertise of its membership to press ahead with much needed guidance on important industry issues. This provides the means to improve practices in the membership and in the wider industry, and serves as a valuable reference for developing regulation.

Title: Hawser Test Report (eBook)
Number of Pages: 200
Product Code: WS1167EA
ISBN: ISBN 13: 978-0-900886-68-3 (9780900886683), ISBN 10: 0-900886-68-4 (0900886684)
Published Date: January 1982

Write Your Own Review

Only registered users can write reviews. Please, log in or register

Windows eBooks:

 

To access the eBook, you need to install our free Windows eBook Reader.

The application can be downloaded from:

www.seamanship.eu/download/freedownload.aspx?file=viewer.

 

Standalone eBooks are supplied with 1 licence + 1 backup and are not transferable between platforms.

 

Remote Desktop Services (Terminal Services) and virtual environments are not supported.

 

The Windows eBook Reader works with Windows XP or later OS (but not Windows RT).

See more details.

 

Cloud (online) eBooks:

 

The Cloud (online) eBooks use Microsoft Silverlight browser plugin to deliver the best possible reading experience with the ability to work in offline mode.

 

It is an annual subscription service (i.e. each eBook is purchased for 1 year of use).

Online licences are not transferrable to Windows or iPad (or vice-versa).

 

Silverlight is compatible with the major web browsers used on Windows and Mac OS X operating systems.

However it is not supported on Linux, Android, Windows RT and iPad devices and therefore the Cloud eBooks use an HTML site in these instances.

The HTML site is more restricted than the Silverlight version.

 

See https://www.microsoft.com/silverlight/what-is-silverlight and more details.

 

Note for Mac Users:

 

Mac users can read Windows eBooks with Boot Camp or using virtual machines such as Parallels Desktop, Virtual Box, ...

Alternatively, Cloud (online) eBooks are accessible on Mac, including the Silverlight plugin with offline mode.

 

Note for Linux Users:

 

Linux users can read Windows eBooks using a virtual PC.

Alternatively, the HTML version of the Cloud (online) eBooks is accessible.

 

Note for Tablet Users:

 

Tablets owners can use the HTML version of the Cloud (online) eBooks.

Look Inside Text