0030/ND Guidelines for Marine Transportations
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TECHNICAL STANDARDS COMMITTEE GUIDELINES FOR MARIN E TRANSPORTATIONS 0030/ND This document has been replaced by the standard DNVGL-ST-N001 which may be accessed through https://my.dnvgl.com/ This document may still be valid for some existing projects. This Guideline was updated as part of the first stage of the harmonisation between the GL Noble Denton and DNV heritage marine services requirements. Refer also to DNVGL-SE-0080 Noble Denton marine services – Marine Warranty Survey for further details. All references to GL Noble Denton apply to the legal entity trading under the DNV GL or GL Noble Denton name which is contracted to carry out the scope of work and issues a Certificate of Approval, or provides a marine related advisory or assurance service. Once downloaded this document becomes UNCONTROLLED. 28 Jun 16 6.1 RLJ Replaced by DNVGL-ST-N001 14 Dec 15 6 RJP Technical Standards Committee 22 Jun 13 5 RJP Technical Policy Board 31 Mar 10 4 RLJ Technical Policy Board 15 Apr 09 3 RLJ Technical Policy Board 1 Apr 05 2 JR Technical Policy Board 22 Sep 04 1 JR Technical Policy Board 18 May 04 0 JR Technical Policy Board Date Revision Prepared by Authorised by http://www.dnvgl.com/ GUIDELINES FOR MARINE TRANSPORTATIONS PREFACE This document has been drawn with care to address what are considered to be the primary issues in relation to the contents based on the experience of the GL Noble Denton Group of Companies (“the Group”). This should not, however, be taken to mean that this document deals comprehensively with all of the issues which will need to be addressed or even, where a particular matter is addressed, that this document sets out a definitive view for all situations. In using this document, it should be treated as giving guidelines for sound and prudent practice, but guidelines must be reviewed in each particular case by the responsible organisation in each project to ensure that the particular circumstances of that project are addressed in a way which is adequate and appropriate to ensure that the overall guidance given is sound and comprehensive. Reasonable precaution has been taken in the preparation of this document to seek to ensure that the content is correct and error free. However, no company in the Group shall be liable for any loss or damage incurred resulting from the use of the information contained herein or shall voluntarily assume a responsibility in tort to any party or shall owe a duty of care to any party other than to its contracting customer entity (subject always to the terms of contract between such Group company and subcontracting customer entity). This document must be read in its entirety and is subject to any assumptions and qualifications expressed therein as well as in any other relevant communications by the Group in connection with it. Elements of this document contain detailed technical data which is intended for analysis only by persons possessing requisite expertise in its subject matter. © 2015 Noble Denton Group Limited. The content of this document is the copyright of Noble Denton Group Limited. All rights reserved. Any reproduction in other material must have written permission. Extracts may be reproduced provided that their origin is clearly referenced. 0030/ND Rev 6 Page 2 of 131 GUIDELINES FOR MARINE TRANSPORTATIONS CONTENTS SECTION PAGE NO. 1 SUMMARY 8 1.1 Content and Scope 8 1.2 The Approval Process 8 1.3 Documentation 8 1.4 Meteorological Conditions, Vessel Motions & Loadings, & Seafastening Design 8 1.5 Stability 8 1.6 Barge, Transport Vessel & Tug Selection, Towing Equipment, Manned Tows 8 1.7 Planning & Conduct of the Towage or Voyage 9 1.8 Multiple Towages 9 1.9 Special Considerations 9 2 INTRODUCTION 10 3 DEFINITIONS & ABBREVIATIONS 13 4 THE APPROVAL PROCESS 22 4.1 GL Noble Denton Approval 22 4.2 Scope of Work Leading to an Approval 22 4.3 Limitation of Approval 23 4.4 Approval Flowchart 24 5 CERTIFICATION AND DOCUMENTATION 25 5.1 General 25 5.2 Ice class 25 5.3 Transportation or Towing Manual 25 5.4 Required Documentation 26 6 DESIGN ENVIRONMENTAL CONDITIONS 27 6.1 Introduction 27 6.2 Operational Reference Period 27 6.3 Weather Restricted & Unrestricted Transportations 27 6.4 Calculation of “Adjusted” Design Extremes, Unrestricted Transportations 27 6.5 Calculation of Exposure 28 6.6 Calculation of Voyage Speed 28 6.7 Calculation of Extremes 28 6.8 Comparison with Percentage Exceedance 29 6.9 Criteria from Transport Simulations 29 6.10 Metocean Database Bias 30 6.11 Design Wave Height 30 6.12 Design Wind Speed 30 6.13 Metocean Data for Bollard Pull Requirements 30 7 MOTION RESPONSE 31 7.1 General 31 7.2 Seastate 31 7.3 Periods 31 7.4 Vessel Heading and Speed 31 7.5 The Effects of Free Surfaces 31 7.6 The Effects of Cargo Immersion 31 7.7 Motion Response Computer Programs 31 7.8 Results of Model Tests 32 7.9 Default Motion Criteria 33 7.10 Directionality and Heading Control 34 8 LOADINGS 36 8.1 Introduction 36 8.2 Loadcases 36 8.3 Default Motion Criteria 37 0030/ND Rev 6 Page 3 of 131 GUIDELINES FOR MARINE TRANSPORTATIONS 8.4 Longitudinal Bending 37 8.5 Cargo Overhangs, Buoyancy and Wave Slam /Green water 37 8.6 One Compartment Damaged 37 9 DESIGN AND STRENGTH 38 9.1 Computation of Loads 38 9.2 Friction 39 9.3 Seafastening Design 41 9.4 Seafastenings to be Removed Offshore 42 9.5 Cribbing 43 9.6 Stress Levels in Cargo, Grillage & Seafastenings 43 9.7 Securing of Pipe and Other Tubular Goods 43 9.8 Inspection of Welding and Seafastenings 45 9.9 Fatigue 46 9.10 Vortex Shedding 46 9.11 Use of Second Hand Steel Seafastenings 46 10 STABILITY 47 10.1 General 47 10.2 Intact Stability 47 10.3 Wind Overturning (Intact Condition - All Units) 48 10.4 Damage Stability (All Units except for Column-Stabilised) 48 10.5 Damage Stability for Jack-Ups 49 10.6 Damage Stability for Column Stabilised Units 50 10.7 Damage Stability (apart from Jack-Ups & Column Stabilised) 51 10.8 Compartmentation and Watertight Integrity 52 10.9 Draught and Trim 53 11 TRANSPORT VESSEL SELECTION 54 11.1 General 54 11.2 Suitability and On-Hire Surveys 54 12 TOWING VESSEL SELECTION AND APPROVAL 55 12.1 General 55 12.2 Bollard Pull Requirements 56 12.3 Tailgates / Stern Rails 59 12.4 Towline Control & Seabed Clearance 59 12.5 Workboat 59 12.6 Communication Equipment 59 12.7 Navigational Equipment 59 12.8 Searchlight 59 12.9 Pump 59 12.10 Additional Equipment 60 12.11 Bunkers & Other Consumables 60 12.12 Towing Vessel Manning 60 13 TOWING & MISCELLANEOUS EQUIPMENT ON TOW 61 13.1 Towing Equipment & Arrangements – General 61 13.2 Strength of Towline & Towline Connections (Outside Ice Areas) 62 13.3 Relationship Between Towline Length and Strength 63 13.4 Towline Connection Points 64 13.5 Bridle Legs 64 13.6 Bridle Apex 64 13.7 Shackles 64 13.8 Intermediate Pennant or Surge Chains 64 13.9 Synthetic Springs 65 13.10 Bridle Recovery System 65 13.11 Emergency Towing Gear 65 13.12 Certification & Inspection 66 13.13 Navigation Lights & Shapes 67 0030/ND Rev 6 Page 4 of 131 GUIDELINES FOR MARINE TRANSPORTATIONS 13.14 Access to Tows 67 13.15 Anchoring & Mooring Equipment 68 13.16 Damage Control & Emergency Equipment 68 14 VOYAGE PLANNING 69 14.1 General 69 14.2 Planning & Sea Room 69 14.3 Routeing & Piracy 70 14.4 Weather Routeing & Forecasting 71 14.5 Departure 71 14.6 Ports of Shelter, Shelter Areas, Holding Areas 72 14.7 Bunkering 72 14.8 Assisting Tugs 72 14.9 Pilotage 72 14.10 Log 72 14.11 Inspections During the Towage or Voyage 72 14.12 Reducing Excessive Movement & the Shipping of Water 73 14.13 Notification of Unusual or Abnormal Events 73 14.14 Diversions 73 14.15 Responsibility 73 14.16 Tug Change 73 14.17 Hazardous Materials 73 14.18 Ballast Water 73 14.19 Restricted Depths, Heights & Manoeuvrability 74 14.20 Under-Keel Clearances 74 14.21 Air Draught 75 14.22 Channel Width & Restricted Manoeuvrability 75 15 PUMPING AND SOUNDING 76 15.1 General 76 15.2 Purpose of Pumps 76 15.3 Pumping System 77 15.4 Pump Type 77 15.5 Pump Capacity 77 15.6 Watertight Manholes 77 15.7 Sounding Plugs and Tapes 78 15.8 Vents 78 16 ANCHORS AND MOORING ARRANGEMENTS 79 16.1 Emergency Anchors 79 16.2 Size and Type of Anchor 79 16.3 Anchor Cable Length 79 16.4 Anchor Cable Strength 79 16.5 Attachment of Cable 79 16.6 Anchor Mounting and Release 79 16.7 Mooring Arrangements 80 17 MANNED TOWS AND TRANSPORTATIONS 81 17.1 General 81 17.2 International Regulations 81 17.3 Riding Crew Carried on the Cargo 81 17.4 Safety and Emergency Equipment 82 17.5 Manned Routine 82 18 MULTIPLE TOWAGES 83 18.1 Definitions 83 18.2 General 83 18.3 Double Tows 84 18.4 Tandem Tows 84 18.5 BIFURCATED Tow 84 0030/ND Rev 6 Page 5 of 131 GUIDELINES FOR MARINE TRANSPORTATIONS 18.6 Two Tugs (in series) Towing One Tow 85 18.7 Multiple Tugs to One Tow 85 19 SPECIAL CONSIDERATIONS FOR THE TRANSPORT OF JACK-UPS 86 19.1 General 86 19.2 Motion Responses 86 19.3 Loadings 86 19.4 Seafastenings for Dry Towages and Transportations 86 19.5 Hull Strength 86 19.6 Stress Levels 87 19.7 Stability and Watertight Integrity 87 19.8 Tugs, Towlines and Towing Connections 88 19.9 Securing of Legs 88 19.10 Drilling Derrick, Substructure and Cantilever 88 19.11 Helideck 89 19.12 Securing of Equipment and Solid Variable Load 89 19.13 Spudcans 89 19.14 Pumping Arrangements 89 19.15 Manning 90 19.16 Protection of Machinery 90 19.17 Anchors 90 19.18 Safety Equipment 90 19.19 Contingency Stand-By Locations 90 20 SPECIAL CONSIDERATIONS FOR THE TOWAGE OF SHIPS 91 20.1 General Considerations 91 20.2 Tug Selection 92 20.3 Towlines and Towing Connections 92 20.4 Stability, Draught, Trim.