[BITList] EMMA MAERSK - E/R Flooding

Mon Apr 1 02:05:30 BST 2013

Colin
Mainly via routing, Cable specs and gland types and packing procedures, 
Rolls-Royce of late don't seem to be as hot as given credit for in the 
past with their poor  workmanship on the 380 engines,  at Austel I had 
one case of the mechanical section running their Hydraulic lines for the 
lifeboat auto lunch system though one of my cable gland plates and at 
first refusing to reroute them until I explained that in the event of a 
fire the lifeboat system wouldn't work as the electrical gland plate 
packing is designed to expand under fire conditions and squeeze shut the 
opening and consequently their hydraulic lines would be crushed
frank
On 4/1/2013 8:41 AM, COLIN TAYLOR wrote:
> 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 <mailto:franka at iinet.net.au>
>     *Sent:* Sunday, March 31, 2013 4:18 AM
>     *To:* BitList <mailto:bitlist at lists.bcn.mythic-beasts.com>
>     *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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