[BITList] passenger ships -FMEA

[FS]

Colin
The power available was summed from each gen and compared with the 
demand signals from the Drilling equipment the resultant output was then 
fed to all the SCR bays in such away that it became a feed forward 
signal rather than the usual feedback system. This setup prevented the 
overload occurring in the first place rather than trying to correct an 
overload after the event which is what all the other systems do some 
even trying to generate a phaseback signal from the main Buss voltage 
which was in the process of collapsing due to the overload. With the 
feed forward setup as I said even with one genny on the board all the 
drilling equipment could be run admittedly the pumps, drawworks etc, 
could only run as fast as the amount of power available,the power limit 
was seamless in operation and was a pleasure to have especially when 
they where stuck in the hole and couldn't understand that a stalled DC 
motor was seen as a short circuit on the system
frank

On 10/19/2012 12:58 AM, x50type at cox.net wrote:
> tks, Frank
> do you know how ross hill managed to achieve the almost impossible?
> I wonder if cruise companies have,or are pursuing, not only fail safe 
> systems but systems that ensure total black outs are impossible.
> could it be that the costs to cruise lines when power fails is a small 
> part of their overall costs and therefore hardly worth bothering about?
> particularly in view of the maximum pittance in compensation [not to 
> mention the logistic difficulty in suing] that, by law. cruise lines 
> offer inconvenienced passengers.
> colin
> *From:* FS <mailto:franka at iinet.net.au>
> *Sent:* Thursday, October 18, 2012 9:52 AM
> *To:* BitList <mailto:bitlist at lists.bcn.mythic-beasts.com>
> *Subject:* Re: [BITList] passenger ships -FMEA
> Colin
> Never came across a power limit system in the merchant ships but in 
> the oil field once SCR systems came on line there where various 
> attempts by different manufactures to protect the equipment from the 
> idiots that operate it but the only one that managed it was Ross Hill 
> (Australian of course) and his system worked brilliantly in preventing 
> the drilling system from overloading the system even when only one 
> genny was on line
> frank
> On 10/18/2012 10:36 PM, x50type at cox.net wrote:
>> As per the recent find ings of the UK P&I Club mention was made of a 
>> number of passenger ships having lost all power for days on end.
>> The cause is usually human error, but as they have multiple 
>> generators and the load is fairly constant I don’t understand how the 
>> electrical logic system fails to prevent total black outs.
>> I have never heard or witnessed Failure Mode and Effect Analysis 
>> [FMEA] surveys being carried out on ships of any type, it appears 
>> passenger ships are in need of such surveys but I don’t think they 
>> are required by classification societies.
>> I understand FMEA’s are carried out from time to on offshore oil rigs 
>> where, as on a passenger ship, loss of all power would be disastrous.
>> Anyone have any info/comment on the above?
>> ct
>>
>>
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