[modeleng] Re: FW: Rail Accident Investigation alert: RAIB investigation - Kirklees

>
> On another serious note.
>
> Fusible plugs have the same chances of failing as RCD's and all other 
> safety
> devices. Right now, I am trying to think of one that is completely 
> failsafe,
> and can't. ( If anyone can think of one, then please tell me what it 
> is!! )
> What can make it hard for fusible plugs to work, is if they get a 
> thick
> enough scale build up over the top of them...... This, while under 
> test, has
> been found to hold back the steam in some circumstances. There is a 
> very
> simple cure for this, and that is to replace the plug at every 
> testing of
> the boiler as the minimum frequency. That seems to nail it for the 
> hobby
> boiler very nicely. For the commercial boiler, they have to be 
> replaced
> according to the relevant standard. Over here (West Aust.) it is 
> annually at
> a minimum frequency. In the marine world, I believe it's at every
> inspection, which is (I believe) every 2 years.......? I can't 
> remember
> now.....
> Regardless, they are the best safety device known to man so far...... 
> I
> suppose we could invent a infer-red temp scanner that will read the 
> temp's
> of all the firebox plates and set of an alarm if the plates get too 
> hot.....
> And the best bit is that you need to measure the fire side of the 
> sheets as
> they are much hotter than the water side...... So now it must 
> withstand
> 1500°C, and would need to be calibrated annually to ensure that it is
> actually working... at the time of calibration......
> Nothing is perfect, so we just have to do the best we can.
>
>
> Have a great weekend.
>
>
> Cheers,
>
> Phill.
>
>
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