[BITList] EMMA MAERSK - E/R Flooding

[FS]

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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