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A MANUAL
FOR MARINE
SURVEYORS
and
SHIP'S OFFICERS
Publishedby MID-C Consultancy
All rights reserved.No part of this publication,otherthanthe enclosedUN
Forms,may be reproduced,storedin a retrieval systemor transmitted,in
any form or by any means, electronic, mechanical, photocopying,
recordingor otherwise,withoutthe written consentof the Publisher.
Copyright @ MID-C Consultancy
Firstprinted 1993
Revisededition 1999
ISBN 095211642 1
Authors: Jim Dibble, PeterMitchell
Printedandboundin the UK
This publicationis intendedto provide guidancein conductinga Draught
Survey. While every effort has been made to ensure practical and
reasonable recommendations,the Authors are not liable for the
consequencesof implementing or attempting to implement these
recommendations.
and
SHIP'S OFFICERS
DIBBLE
Master Mariner B.Sc MIIMS
MNI
MRIN
MITCHELL
Master Mariner B.Sc MIIMS
MNI
P.
W.J.
ACKNOWLEDGEMENTS
Our gratitudeto the InternationalInstitute of Marine Surveyorsfor their continued
supportandencouragement.Our gratitudealsoto CaptainErik Hammarstromfor his
knowledgeand experienceof draughtsurveyingin sub-zeroconditions. We would
alsolike to thank Arthur Chadwick,for his editorial assistance,and CaptainEvagelos
Taliatoudasfor his meticulouswork onthe original script.
We hopethis publicationwill providethe beginnerwith all the necessary
information
to successfullycompletea draughtsurvey,and also help to remind and clarify the
basicprinciplesandtheoryfor the moreexperiencedsurveyor.
Jim Dibble
PeterMitchell
To conductan accuratedraughtsurveyis an art that mustbe backedup with science.
This book lays out the scienceand correctprocedures
in a mannerthat will provide a
backgroundto the practiceof draughtsurveying. The book is intendedfor mariners
and non-marinersentering the professionof Marine Surveying. There can be no
substitutefor practical experiencein this field, but the experienceshouldbe soundly
baseduponcorrectscientificprinciples.
ii
MID-C
CONTENTS
INTRODUCTION
V
STABILITY
INFORMATION
1
STABILITYINFORMATIONBOOK ...'.'...'...'.'.'.'.'.'.'.'.'.'.'."'.'.'..""""'
1
HYDROSTATICDATA (HYDROSTATICPARncULARs)
2
DATA MANUALFORDRAUGHTSURVEYS
10
DEADWEIGHTORDISPLACEMENTSCALE
12
CAPACITYPLAN ANDTABLES
12
PLANs
15
BONJEANCURVES
15
LIGHTSHIP
15
ASSESSMENT OF UNDERWATER VOLUME
17
DRAUGHTMEASUREMENT
17
CORRECnONOFDRAUGHTS
24
CORRECnONSFORTRIM
37
ASSESSMENT
SUMMARY
42
THE BASIC PHYSICS
44
DENSITY
46
RELATIVEDENSITY
48
HYDROMETERS
53
SAMPLING
58
DEDUCTIBLES
59
SOUNDINGSANDULLAGES
60
SAMPLING
61
TRIMCoRREcnoNs
62
ADDITIONALFACTORS
66
PRACTICAL
PROCEDURE
-~-,,~~-
70
APPENDICES
,
76
ICEAND SNOW
76
CHECKLISTS
81
GLOSSARY
84
METRIC/IMPERIALCONVERSIONS
89
U.N. ECE DRAUGHTSURVEYCODEFORMS
90
INDEX
97
MID-C
III
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