[BITList] EMMA MAERSK - E/R Flooding

Mon Apr 1 01:41:54 BST 2013

thanks Frank, there is tons of stuff on line referring to cables and cable glands also class specs.as rolls-royce supplied the thruster things it is inconceivable that they are not well aware of the requirement for cabling and cable glands.it appears the trite reason for the flooding via cable 'holes' given by owner's rep is suspect or has lost something in the reporting and/or translation. how was the cable problem avoided at Austel? ct
 Date: Mon, 1 Apr 2013 07:40:51 +0800
From: franka at iinet.net.au
To: bitlist at lists.bcn.mythic-beasts.com
Subject: Re: [BITList] EMMA MAERSK - E/R Flooding

    Colin

    The fillers in a lot of cables are cotton tapes and hemp strands
    which are hygroscopic plus when Armoured cable is used with a
    protective sheath over it water as is its want will make its way
    along  the spacing between the outer and inner sheaths by capillary
    action. American military cables are designed not to do this whereas
    the British navy never had the same specifications also the glanding
    of the cables at each end are designed not to allow ingress of fluid
    or Gas into the cable which makes them a pain to terminate I know
    meeting DNV specs at Austals on their ships this problem was avoided
    and the Danes are old time seafarers but there again so are the
    brits so its all in the specs called for by the owners and
    classification bodies API worried about transporting gas from one
    compartment to another

    frank

    On 4/1/2013 12:32 AM, x50type wrote:

          Frank

          I know nothing about shipboard electrical
              cables; what specifically in the cable materials will
              cause such serious wicking?
          do you think it is possible for this
              particular flooding [allegedly due to cables thro the
              bulkhead] to have been caused by something that escaped
              the ship builder, the owner’s reps on the job and the
              classification surveyors?

          and talking of class, there must be reams
              of regs as far as electical cables are concerned

          enquiring minds want to know.

          ct

                From: FA 
                Sent: Sunday, March 31, 2013 4:18 AM
                To: BitList

                Subject: Re: [BITList] EMMA MAERSK - E/R
                  Flooding

            Hugh 

              if non hygroscopic non wicking cables are not specified
              once capillary action sets in its really surprising the
              amount of fluid that can  be transported along a bundle of
              cables enough to flood a compartment in a relatively
              short  time its almost like having a fire hose running

              frank

              On 3/31/2013 3:28 PM, HUGH wrote:

              Mike,

              While I
                  often specified the runs for major cables in ERs as a
                  service to the electrical dept, and to make it easier
                  to determine pipe and vent runs, I treated the cables
                  as objects belonging to somone else, so
                  filled/unfilled was never an issue for me - your
                  mention of it is the first I've ever seen. Whether it
                  mattered to the electricians, I cannot recall. On the
                  Newton, de-gaussing influenced cable runs, and other
                  requirements to do with her main role as a vehicle for
                  underwater noise, etc, detection made it necessary to
                  run the phases in certain configurations. Changes of
                  direction were tricky, so we used a 1:5 model with
                  coloured wire roughly to scale.

              Going
                  back to the point, I cannot see any self respecting
                  water queueing up to get along a cable via the few
                  small points of access when there are better, and more
                  direct routes to freedom. The more I read about the
                  Maersk ship in question, the more I'm surprised she
                  ever floated.

              Hugh. 

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