IMCA D010 Diving Operations from DP Vessels
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ABF Diving Operations from Vessels Operating in Dynamically Positioned Mode International Marine Contractors Association IMCA D 010 Rev. 3 May 2008 www.imca-int.com AB The International Marine Contractors Association (IMCA) is the international trade association representing offshore, marine and underwater engineering companies. IMCA promotes improvements in quality, health, safety, environmental and technical standards through the publication of information notes, codes of practice and by other appropriate means. Members are self-regulating through the adoption of IMCA guidelines as appropriate. They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients. There are two core activities that relate to all members: Safety, Environment & Legislation Training, Certification & Personnel Competence The Association is organised through four distinct divisions, each covering a specific area of members’ interests: Diving, Marine, Offshore Survey, Remote Systems & ROV. There are also four regional sections which facilitate work on issues affecting members in their local geographic area – Americas Deepwater, Asia-Pacific, Europe & Africa and Middle East & India. IMCA D 010 Rev. 3 This guidance has been produced under the direction of the IMCA Diving Division Management Committee. This document supersedes all previous versions of IMCA D 010 published since January 1998, with are now withdrawn. www.imca-int.com/diving The information contained herein is given for guidance only and endeavours to reflect best industry practice. For the avoidance of doubt no legal liability shall attach to any guidance and/or recommendation and/or statement herein contained. Diving Operations from Vessels Operating in Dynamically Positioned Mode IMCA D 010 Rev. 3 – May 2008 Since the 1970s it has been common practice to carry out diving operations from vessels operating in dynamic positioning (DP) mode. During this time several documents have been published which give guidance on ways of achieving safe operations using this system (see bibliography). Accidents and incidents have occurred world-wide resulting in injury and death of divers and IMCA considers that a comprehensive document is required giving guidance on aspects of diving operations from DP vessels. This guidance note, which supersedes earlier versions issued since 1998, gives advice which is applicable anywhere in the world and to any type of diving operation. In certain countries there may be regulatory requirements which should always be complied with first, followed by the advice in this document. 1 Introduction ........................................................................................................... 1 1.1 Scope.................................................................................................................................................................... 1 1.2 Objectives............................................................................................................................................................ 1 1.3 Application .......................................................................................................................................................... 1 1.4 Variations............................................................................................................................................................. 1 1.5 This Revision....................................................................................................................................................... 1 2 Responsibility and Authority of Personnel ......................................................... 2 2.1 Vessel Masters.................................................................................................................................................... 2 2.2 DP Operators..................................................................................................................................................... 2 2.3 Senior Diving Supervisors and Diving Superintendents............................................................................. 2 2.4 Diving Supervisors and Life Support Supervisors ....................................................................................... 2 2.5 Client’s Representative..................................................................................................................................... 2 3 Safety Management............................................................................................... 3 4 Marine Interface .................................................................................................... 4 4.1 General Principles.............................................................................................................................................. 4 4.2 Isolation of Thrusters or Propellers.............................................................................................................. 4 4.3 Resumption of Diving Activities...................................................................................................................... 4 4.4 Vessels in Close Proximity............................................................................................................................... 4 5 DP Alert Responses............................................................................................... 5 5.1 Green – Normal Operational Status............................................................................................................. 5 5.2 Yellow – Degraded Operational Status ........................................................................................................ 5 5.3 Red – Emergency Status................................................................................................................................... 5 6 Vessel Movement Limitations.............................................................................. 6 7 Umbilicals ............................................................................................................... 7 7.1 Safety Principles.................................................................................................................................................. 7 7.2 Identification of Hazards................................................................................................................................... 7 7.3 Main Services Umbilical Safety ........................................................................................................................ 7 7.4 Excursion Umbilical Safety............................................................................................................................... 8 7.5 Deployment of the Excursion Umbilical ....................................................................................................... 9 7.6 Use of Negatively Buoyant Umbilicals........................................................................................................... 9 7.7 Deployment of Divers Using In-Water Tending Points ............................................................................ 9 8 Shallow Water ..................................................................................................... 13 8.1 Limitations.........................................................................................................................................................13 8.2 Vessel Draught .................................................................................................................................................13 8.3 Vessel Capability ..............................................................................................................................................13 8.4 Position References.........................................................................................................................................13 8.5 Environmental Conditions .............................................................................................................................14 9 Diving Within an Anchor Pattern...................................................................... 15 9.1 Safety Principles................................................................................................................................................15 9.2 Mooring Line Identification............................................................................................................................15 9.3 Mooring Line Adjustments.............................................................................................................................15 9.4 Permit-to-Work and Reporting Procedures..............................................................................................15 9.5 Minimum Operating Clearance.....................................................................................................................15 9.6 Position References.........................................................................................................................................16 9.7 Operational Plots.............................................................................................................................................16 10 Subsea Structures and Wellheads ..................................................................... 17 11 References ...........................................................................................................