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quote:Originally posted by Frosty 4:My assunptions were correct on the oil filled caps.Heat and a poor voltage rating (lower than or at near the voltage they are subjected to causes failure. I used to double the rating in the circuits I designed and never had issues. (Retred Electrical Engineer).I'm surprised that this happened ,someone did not check the design spec somewhere.Frosty 4
Excuse me, but how do you know that the 'voltage rating' of the concerned capacitor was the problem? Maybe you should also be a bit more careful with assumptions like 'someone did not check the design spec'.
Frosty4
quote:Originally posted by Frosty 4:Are you an electrical engineer with 40+ years of experience??? A MSEE or PHD?One must be careful in designing power supply filter circuits. A little over design always helps.One must ask why the explosion and another cap in bad shape????Frosty4
It is entirely irrelevant but I do indeed hold a PhD in Physics and I am indeed working with similar equipment.
In your comment above you jump to the conclusion that a design flaw was the reason for the explosion. If bother you read the accident report you will see that there is no indication that this was the case.
It might be a surprise for you but other people are also aware of safety margins. Fortunately the people who design such equipment are far more competent than you seem to be based on your rather simple minded comments posted above.
Italianliners
quote:Originally posted by Frosty 4:[...]I'm a perfectionist ! Fortunately never had any problems arise on my designs. I used component ratings far above the need value.I await the report (if we are told) as to what caused the explosion.I stand on my comments from experience.Sorry you don't agree.F4
Look, if you are indeed a perfectionist I wonder why you did not bother to read the report first before making such public (!) statements (see link in article posted above!).
Your unfounded public accusations are entirely based on very amateurish speculations which are certainly not becoming more factual by referring to your experience.
Your designs have nothing to do with what happened aboard QM2 nor does it matter what you think that I am doing for a living. It is simply embarrassing (sorry Italianliners) especially since some of you comments actually indicate a severe lack of knowledge on that matter.
[ 12-05-2010: Message edited by: Ernst ]
Pam
quote:Originally posted by PamM:The real MAIB safety bulletin should perhaps be read. The news reports have re-worded some aspects.Pam
Also the present MAIB Safety Bulletin is just that: a bulletin to cruise ship operators/owners, basically recommending that they should check the capacitors on their ships. It also recounts the facts, but doesn't give causes. There will be a full report in due course which will do that, I expect.
We have to wait for the in depth investigations of causes before discussing whether design specs should have been checked or not. I can't imagine they weren't anyway, but who knows; usage could be over and above what they were designed for, or maintenance not what it should have been - we have no idea and all speculation, not fact. What the specs are would have been more useful as I don't have a clue on such matters
It's a safety bulletin, not a report on the explosion itself. Interesting enough in its own right; I knew she had had a black out at that time, but had heard nothing re an explosion of some sort causing it.
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