PREPARED FOR PREPARED CHECKED APPROVED More than SEATTLE, WASHINGTON PROVIDENCE, RHODE ISLAND DESIGN. T +1 206.624.7850 GLOSTEN.COM Table of Contents Abstract ...................................................................................................................... ix Section 1 Introduction and Overview .................................................................... 1 1.1 Introduction ................................................................................................................... 1 1.2 Overview ....................................................................................................................... 1 1.2.1 Review the Literature ............................................................................................. 1 1.2.2 Identify Parameters and Create Towing Vessel Inventory .................................... 1 1.2.3 Identify BAT Design Standards and Equipment, .................................................. 2 1.2.4 Downselect Inventory ............................................................................................ 2 1.2.5 Score Candidate Vessels and Perform Gap Analysis ............................................ 2 Section 2 Literature Review .................................................................................... 3 2.1 Introduction ................................................................................................................... 3 2.2 ETV Types .................................................................................................................... 4 2.2.1 Smaller Tugs (under 40m) ..................................................................................... 4 2.2.2 Large Ocean Service Tugs ..................................................................................... 4 2.2.3 Large Multi-Mission Vessels ................................................................................. 4 2.2.4 Summary of Vessel Type Findings ........................................................................ 5 2.3 Summary of Capabilities ............................................................................................... 5 2.4 ETV Equipment and Characteristics ............................................................................. 6 2.4.1 Principal Dimensions ............................................................................................. 7 2.4.2 Installed Power....................................................................................................... 8 2.4.3 Propulsors ............................................................................................................ 10 2.4.4 Hullform and Seakeeping .................................................................................... 11 2.4.5 Range, Endurance, Speed .................................................................................... 12 2.4.6 Deck Machinery and Layout ................................................................................ 12 2.4.7 Towing and Line Handling Gear ......................................................................... 13 2.4.8 Navigation Suite, Bridge Equipment, and Communications ............................... 13 2.4.9 Crewing and Accommodation ............................................................................. 14 2.4.10 Miscellaneous Equipment .................................................................................... 14 Section 3 Hinchinbrook ETV Parameters ............................................................ 16 3.1 Introduction ................................................................................................................. 1 6 3.2 Hinchinbrook Tug Operating Mission ........................................................................ 16 3.3 Design and Performance Parameters ........................................................................... 17 3.3.1 Notes on Bollard Pull ........................................................................................... 19 BAT Assessment for the Hinchinbrook ETV 21 April 2021 Final Report i Job 20099.01, Rev A Section 4 BAT Design Standards and Equipment .............................................. 20 4.1 Methodology ............................................................................................................... 20 4.2 Stage 1: Transit to the Affected Vessel ....................................................................... 20 4.2.1 Major Design Considerations .............................................................................. 21 4.2.2 Optimal Vessel Arrangements and Equipment .................................................... 22 4.3 Stage 2: Intercepting and Surveying the Affected Vessel ........................................... 24 4.3.1 Major Design Considerations .............................................................................. 25 4.3.2 Optimal Vessel Arrangements and Equipment .................................................... 26 4.4 Stage 3: Close-Range Maneuvering & Establishing Towing Connection .................. 29 4.4.1 Major Design Considerations .............................................................................. 30 4.4.2 Optimal Vessel Arrangements and Equipment .................................................... 32 4.5 Stage 4: Towing the Affected Vessel .......................................................................... 33 4.5.1 Major Design Considerations .............................................................................. 35 4.5.2 Optimal Vessel Arrangements and Equipment .................................................... 36 4.6 Stage 5: Cessation/Handoff of the Towing Operation ................................................ 42 4.6.1 Major Design Considerations .............................................................................. 43 4.6.2 Optimal Vessel Arrangements and Equipment .................................................... 44 4.7 Conclusion ................................................................................................................... 4 5 4.7.1 Improved Design Tools........................................................................................ 45 4.7.2 Redundancy and Reliability ................................................................................. 45 4.7.3 Balancing Conflicting Demands .......................................................................... 46 Section 5 Comparison of Presently Used ETVs .................................................. 48 5.1 Methodology ............................................................................................................... 48 5.1.1 Phase 1: Parametric Filtering ............................................................................... 48 5.1.2 Phase 2: Preliminary Scoring ............................................................................... 48 5.2 Candidate Vessels ....................................................................................................... 49 5.3 Emerging Designs ....................................................................................................... 50 5.3.1 New SASEMAR Vessel ...................................................................................... 50 5.3.2 Robert Allan Ltd. RASalvor Series ..................................................................... 51 5.3.3 T-ATS 6 Class...................................................................................................... 53 Section 6 BAT Evaluation and Gap Analysis ...................................................... 54 6.1 Methodology ............................................................................................................... 54 6.1.1 Limitations of This Study .................................................................................... 54 6.1.2 Scoring Parameters .............................................................................................. 54 6.1.3 Cost Parameters ................................................................................................... 57 BAT Assessment for the Hinchinbrook ETV 21 April 2021 Final Report ii Job 20099.01, Rev A 6.1.4 Combining Score and Cost .................................................................................. 57 6.1.5 ADEC Criteria ..................................................................................................... 58 6.2 Results ......................................................................................................................... 59 6.3 Luz De Mar Class Profile ............................................................................................ 60 6.4 Gap Analysis ............................................................................................................... 62 6.4.1 Summary .............................................................................................................. 62 6.4.2 Vessel Particulars ................................................................................................. 63 6.4.3 Detailed Scoring Breakdown ............................................................................... 66 6.4.4 Bollard Pull .......................................................................................................... 68 6.4.5 Seakeeping and Motions ...................................................................................... 68 6.4.6 Structural Crew Protection ..................................................................................