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IMCA D022 the Diving Supervisor's Manual

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IMCA D022 the Diving Supervisor's Manual AB The International Marine Contractors Association The Diving Supervisor’s Manual IMCA D 022 www.imca-int.com May 2000, incorporating the May 2002 erratum 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 committees 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 022 The Diving Supervisor’s Manual was produced for IMCA, under the direction of its Diving Division Management Committee, by Paul Williams. 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. The Diving Supervisor’s Manual First edition, 2000 Published by The International Marine Contractors Association Carlyle House, 235 Vauxhall Bridge Road, London SW1V 1EJ, UK www.imca-int.com © IMCA 2000 ISBN: 1-903513-00-6 The Diving Supervisor’s Manual Chapter 1 - Introduction.......................................................................................................... 1 1 IMCA ..........................................................................................................................................................................................3 2 The IMCA International Code of Practice for Offshore Diving ..................................................................................3 3 IMCA Certification Schemes.................................................................................................................................................3 4 Qualification of divers.............................................................................................................................................................4 5 The IMCA Competence Assurance and Assessment Scheme ......................................................................................5 Chapter 2 - Diving Physics ....................................................................................................... 7 1 Units of Measurement............................................................................................................................................................9 2 The Metric System ..................................................................................................................................................................9 3 The FPS System........................................................................................................................................................................9 4 Temperature.............................................................................................................................................................................9 5 Parts per million.....................................................................................................................................................................10 6 Calculations and calculators................................................................................................................................................10 7 Gas volumes............................................................................................................................................................................11 8 Available gas............................................................................................................................................................................13 9 How much time is available? ...............................................................................................................................................13 10 Other ways of working ........................................................................................................................................................14 11 Accurate helium volumes ....................................................................................................................................................15 12 Surface supply compressors................................................................................................................................................15 13 Gas use in a an emergency..................................................................................................................................................17 14 The effect of temperature ...................................................................................................................................................17 15 Partial Pressures.....................................................................................................................................................................18 16 Choosing the right mix.........................................................................................................................................................19 17 The US Navy Partial Pressure Tables ...............................................................................................................................20 18 Gas Mixing...............................................................................................................................................................................21 19 Chambers and Bells...............................................................................................................................................................22 20 Calculating the depth of rich mix.......................................................................................................................................23 21 Pressurisation using 2% mix or weaker............................................................................................................................24 22 Gas volumes for pressurisation..........................................................................................................................................24 23 Aborting a pressurisation ....................................................................................................................................................25 24 Daily gas use ...........................................................................................................................................................................27 25 Adding gas to the chamber..................................................................................................................................................27 26 Adding oxygen to the chamber..........................................................................................................................................28 27 How much oxygen is needed?............................................................................................................................................28 28 Oxygen and decompression................................................................................................................................................28 29 Fire............................................................................................................................................................................................30 30 Temperature changes...........................................................................................................................................................30 31 Bleeding the chamber ...........................................................................................................................................................31 32 Joining chambers together...................................................................................................................................................31 33 Soda lime use..........................................................................................................................................................................33 34 Pressurising the bell ..............................................................................................................................................................34 35 Chemical sampling tubes......................................................................................................................................................34 36 PSE and SEP.............................................................................................................................................................................34 37 Total gas volumes..................................................................................................................................................................35
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