TECHNICAL POLICY BOARD
GUIDELINES FOR FLOAT-OVER INSTALLATIONS
0031/ND
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Plea check the website below for the current version.
6 Dec 10
0 RJP Technical Policy Board Date Revision Prepared by Authorid by
PREFACE
This document has been drawn with care to address what are likely to be the main concerns bad on
the experience of the GL Noble Denton organisation. This should not, however, be taken to mean that this document deals comprehensively with all of the concerns which will need to be addresd or even, where a particular matter is addresd, that this document ts out the definitive view of the organisation for all situations. In using this document, it should be treated as giving guidelines for sound and prudent practice on which our advice should be bad, but guidelines should be reviewed in each particular ca by the responsible person in each project to ensure that the particular circumstances of that project are addresd in a way which is adequate and appropriate to ensure that the overall advice given is sound and comprehensive.
文章演的电影Whilst great care and reasonable precaution has been taken in the preparation of this document to ensure that the content is correct and error free, no responsibility or liability can be accepted by GL Noble Denton for any damage or loss incurred resulting from the u of the information contained herein.当归有什么作用
© 2010 Noble Denton Group Limited, who will allow:
∙the document to be freely reproduced,
∙the smallest extract to be a complete page including headers and footers but smaller extracts may b
e reproduced in technical reports and papers, provided their origin is clearly referenced.
CONTENTS
SECTION PAGE NO. 1SUMMARY 5 2INTRODUCTION 6
2.1General 6
2.2Start and completion of operations 6
2.3Other GL Noble Denton guideline documents 6
2.4Codes and legislation 6
2.5Downloads 7 3DEFINITIONS AND ABBREVIATIONS 8 4THE APPROVAL PROCESS 10
4.1General 10
4.2GL Noble Denton approval 10
4.3Certificate of approval 10
4.4Scope of work leading to an approval 10男孩的英语单词
4.5Limitation of approval 10
4.6Safety during float-over 11 5LOADOUT AND TRANSPORTATION 12 6DESIGN ENVIRONMENTAL CONDITIONS 13
6.1Principles 13
6.2Operational reference period 13
6.3Weather-restricted operations 13
6.4Weather unrestricted operation 14
6.5“Adjusted” design extremes, unrestricted operations 14
6.6Operational feasibility 14 7WEIGHT CONTROL 15 8CONSIDERATIONS INFLUENCING BARGE SELECTION CRITERIA FOR LOADOUT AND TRANSPORTATION AND THE FLOAT-OVER 16 9FLOAT-OVER ENGINEERING 17
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9.1General 17
9.2Barge load conditions 17
9.3Stability during installation 17
9.4Motions and mating stages 17
9.5Clearances 18
9.6Barge mooring and positioning overview 19
9.7Barge mooring and stand-off moorings 19
9.8Clearances around mooring lines and anchors 19
9.9Position keeping during mating with tethers 19
9.10Barge positioning using a tug(s) with mooring lines 20
9.11Barge positioning using a DP system 20
9.12Host structure – structural considerations 20
9.13Floating host structure – additional structural considerations 20
9.14Floating host structure – freeboard, stability and rerve buoyancy 21 10STRUCTURAL STRENGTH 22
10.1Codes 22
10.2Seafastenings 22
10.3Fenders and guides 23 11PUMPING AND BALLASTING 24
11.1Principles 24
11.2Host structure ballasting equipment 24
11.3Tidal limitations 24
11.4Pumping capacity 25
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11.5Ballasting and gauging systems 26 12MARINE EQUIPMENT 27
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12.1General 27
12.2Installation vesl control systems 27
12.3Leg mating units 27 13ASSIST TUGS AND SUPPORT VESSELS 28 14FLOAT-OVER INSTALLATION MONITORING EQUIPMENT 29
14.1Leg markings / leg access 29
14.2Motions / clearance monitoring 29
14.3Environmental monitoring 29 15MARINE OPERATIONS PROCEDURES 30
15.1Principles 30
15.2Weather forecasting 30
15.3Installation manual 30 16MANAGEMENT AND ORGANISATION 32 REFERENCES 33
TABLES
Table 6-1 Design Seastate Reduction Factor 14 Table 10-1Load Factors 22 Table 11-1Installation Class 24 Table 11-2Required Pumping Capacity 25
1SUMMARY如何提高步频
1.1This document has been developed to provide guidelines for the float-over installation of structures
onto:
nba第一中锋∙Offshore pre-installed structures, e.g. jackets and concrete units, or
∙Offshore or inshore floating structures, e.g. TLPs, concrete units and mi-submersibles.
1.2The guidelines are intended to lead to an approval by GL Noble Denton, which may be sought
where an operation is the subject of an insurance warranty, or where an independent third party review
is required.
1.3 A description of the Approval Process is included, for tho projects which are the subject of an
insurance warranty.
1.4The document includes the requirements for consideration, intended to reprent good practice, for the
following phas :
∙Engineering
∙Barge lection
∙Positioning and manoeuvring
∙Set down
∙Barge removal
∙Operational considerations.
1.5Check lists are appended, to act as a guide to information required.
