This publication provides practical guidance on marine operations of jack-up type barges and jack-up towing and positioning. It examines each stage of the operation and identifies best practice and potential hazards.

 

The Oilfield Seamanship series describes and explains standard techniques used in marine operations in offshore oilfields. The series concentrates on towing, anchor handling, barge mooring and moving, the operation of jack-up vessels afloat, the practice of stability control on semi-submersibles and ballast control techniques.

CONTENTS – SECTION ONE

Marine Operations of Jack-up Type Barges

 

PART 1. General comments on moving Jack-ups

PART 2. Sequence of events – with examples of General Checklists

PART 3. Jacking Down and Getting Afloat – with examples of Pre-move Checklists

PART 4. Jacking Down, Leg Cord Loadings

PART 5. Pulling Legs, Deep Penetration – Cautions

PART 6. Pulling Legs, Deep Penetration – Freeing Methods

PART 7. Transit Afloat

PART 8. Leg Wedges and Rack Chocks – use of

PART 9. Daily Checklist for Afloat Operations – with example of Standing Orders

PART 10. Transit Operations Afloat – Heavy Weather Seamanship

PART 11. Transit Operations Afloat – Extreme Storm Conditions. Preparations and Planning

PART 12. Transit Operations Afloat – Damage Control. Flooding

PART 13. Criteria for Field and Inter Field Moves

PART 14. Decision Making Process. Moving Operations, Jacking Criteria

PART 15. Notes on the Towage – with example of Poor Planning

PART 16. Preparations for Ocean Tow

PART 17. Arrival at New Location – with example of Positioning Procedure

PART 18. Manoeuvring Diagrams and Tug Deployment

PART 19. Going onto Location - Open Location, 2 Tugs

PART 20. Calculation of Leg Footing Position – example
PART 21. Rig Positioning – Leg Torque and Tension

PART 22. Pre-loading and Associated Operations

PART 23. Pre-load Methods

PART 24. Pre-loading 4 Leg Jack-ups

PART 25. Pre-loading 4 Leg Jack-ups – Notes on Hydraulic Jacking Systems

PART 26. Pre-loading in Areas of Extreme Tidal Ranges

PART 27. Pre-loading – Cautions, Notes and Examples

PART 28. Punch Through

PART 29. Testing an Unknown Bottom – Pre-loading Methods

PART 30. Leg Footing’s Strength – Hard Bottoms

PART 31. Soil Classification – Tables and Tests

PART 32. Site Investigation. Hazards and Evaluation

PART 33. Elevated Operations – Calculating Leg Reactions

PART 34. Leg Foundation Stability

PART 35. Monitoring Sea Bed Conditions – and recommending Corrective Actions. Scour and Associated Problems

PART 36. Locating Alongside Platforms – General Procedures

PART 37. Locating onto Jackets – Post Hole Problems

PART 38. Correction of Misalignment. Elevated Operations

PART 39. Locating onto Sub-Sea Templates/Well Heads

PART 40. Working in areas of Large Tidal Range

PART 41. Jacking Machinery – General Notes

PART 42. Rig Movers Equipment

PART 43. Warranty Surveyor’s Role and Duties – with examples of typical recommendations

PART 44. Motion Limits – Diagrams and their Use

PART 45. Guidelines for Moving in a series of Field Moves

PART 46. Operations Manual – Extracts from examples of Afloat Operations Instructions

PART 47. Pre-move Checklist – examples

PART 48. Matt Supported Units

PART 49. Positioning

 

CONTENTS – SECTION TWO

Jack-up Towing and Positioning

 

PART 1. General – Use of Tugs

PART 2. Gear Make Up and Strength Calculations

PART 3. Making Fast Main Tow Gear

PART 4. Towing Positions

PART 5. Leaving Open Location – 2 Boats

PART 6. Going onto Open Location – 2 Boats

PART 7. Going onto Open Location – 2 Boats – Sequence of Events

PART 8. Going onto Location – 2 Boats. Using a Stern Bridle

PART 9. Going onto Open Location – 3 Boats

PART 10. Positioning Alongside Platforms

PART 11. Positioning onto a Platform – Basic Procedure

PART 12. Positioning around a Platform Complex

PART 13. Walking onto a Platform

PART 14. Positioning onto Platforms – Alternative Methods of Control

PART 15. Positioning Using Harbour Tugs

 

Appendix 1. PED 4-16/90. Jack-up Towing/Moving

Appendix 2. Method of Calculating Tow Forces

Appendix 3. Use of Jack-up. Heavy Lift Operations

Appendix 4. Selecting Tugs for Jack-up Operations

The purpose of this book is to give practical advice on the management of jack-up barges afloat and during positioning and elevating operations.

 

It is not written for particular types of jack-up unit and all types have slightly different methods of operating systems such as jacking equipment.

 

Jack-up barges are essentially land based work platforms which can be moved from place to place by floating the platforms.

 

To assume that a jack-up barge is a seagoing vessel is most unwise. The loss rate of jack-ups under tow, compared to other similar specialised craft, is high and reflects their vulnerability to the normal perils of the sea.

 

An examination of the reports of numerous losses or cases of severe damage shows that the basic causes were, in general, bad judgement, lack of proper planning and poor voyage management.

 

It is not often appreciated that the crews of a jack-up may spend many months operating their vessel far divorced from the forces of the sea, elevated many metres above the surface. The transition to afloat operations is rapid and in the alien environment of the sea, habits acceptable when elevated are very difficult to change in a matter of a few hours

 

For more detailed information on jack-up stability and ocean towing refer to other volumes in this series, Volume 5 covering Stability and Ballast Control and Volume 3 covering Anchor Handling and Towing.

 

The majority of this text refers to independent leg jack-up units. Matt jack-ups share most of the characteristics of independent leg types and the main differences are dealt with in a separate section (part 48).

Witherbys titles are developed using scripts developed by technical experts that are peer reviewed within work groups. Typically, they seek to improve understanding of the regulations, recommendations and guidelines issued by Industry.

Witherbys staff have significant expertise in the fields of navigation and hazardous cargoes as well as in the presentation of complex subjects in a graphic and easy to understand manner.

Title: Jack-Up Moving (Oilfield Seamanship Series Volume 2)
Number of Pages: 326
Product Code: CL1065K
ISBN: ISBN 13: 978-1-870945-41-7 (9781870945417), ISBN 10: 1-870945-41-7 (1870945417)
Published Date: January 1994
Binding Format: Paperback
Book Height: 300 mm
Book Width: 210 mm
Book Spine: 20 mm
Weight: 1.00 kg
Author: Witherby Publishing Group

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