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Supply vessel (boat/ ship) thrust impact on persons in water
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#1 Posted : 26 December 2005 13:06:00(UTC)
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Posted By Joseph Bryce
I'm needing some information on what impact the thrusters of a supply vessel would have in the surrounding water while holding station of a structure in up to a 3m sea, i.e. turbulence, aeration, movement. What impact would this have on the survival of a person (falling) in the water, what would be considered a safe distance without compromising safety?

Any marine specialists out there?


Regards
Joe
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#2 Posted : 31 December 2005 12:37:00(UTC)
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Posted By Patrick Burns CMIOSH, - SpDipEM - MIQA
Hi Joe

I work in the Marine Industry and we operate several small vessels with different propulsion systems some conventional propellers and others with water jets, aqua masters etc. You don't give too much information with regards to type, location on hull, or designed operating limits. Some thrusters can push the person away from the ship, whilst others can drag them in.

The marine safety forum specialise in off shore supply vessels and you can find them at http://www.marinesafetyforum.org/ I am sure if you contact them through the website with as much background information as you can they will be able to advise you on this matter.
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#3 Posted : 02 January 2006 22:06:00(UTC)
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Posted By Ian Waldram
A conservative approach would be to follow IMCA (International Marine Constructors Assoc.) Guidance for air diving, which says "The length of the working diver’s umbilical must be restrained in such a way that it cannot reach to within 5 metres of any physical hazards (such as thrusters, propellers etc.)" IMCA Document D 010 Rev. 2, July 2000 - Diving: operations from vessels operating in dynamically positioned mode.

Sorry it has taken me a few days to consult with my diving specialist contact and get the exact details!
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