Last set of BR or older era boiler tubes?

pete2hogs · 27 мар 2018

Jkelsh сказал(а): ↑

Andrew does refer to rumours about it being low on water when it stopped, leading to a surge when it moved again, but he didn't feel this was really credible: "There is a theory being widely discussed that the engine was low on water when it stopped moving at the showground. This may have allowed part of the tube plate to become excessively hot such that when the engine next moved water surged and covered the heated area, which suddenly created a large volume of steam thus precipitating the collapse of the crown. However this overheated area would be adjacent to the fusible plug and since the tin filling has a relatively low melt point it is difficult to imagine how this could occur without the filler melting. I understand that the showground area where the explosion occurred is relatively flat.". Again no suggestion the fusible plug was in any way rendered incapable of operating. Obviously Andrew isn't/wasn't an official investigator, but the other references to official reports don't seem to support this theory either.

Across the different accounts there are minor differences: Was the safety valve tested up to 200psi, or 250psi without it lifting? Should it have been set at 125psi, or 160psi? But the general points do agree with each other, and with the greatest of respect, don't seem to confirm the details you've stated.
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In the book regarding Boiler Explosions by Hewison, it dismisses the 'water flashing to steam' theory as not being what really happens in a boiler, though commonly raised throughout the early history of boiler explosions in the UK. Apparently tests were carried out which disproved the theory.

Eightpot · 28 мар 2018

Have George Stephenson's original 'Rocket' or any of the other surviving locos of that period still got tubes in them?

Jamessquared · 28 мар 2018

Eightpot сказал(а): ↑

Have George Stephenson's original 'Rocket' or any of the other surviving locos of that period still got tubes in them?
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Rocket definitely hasn't. Most of the valuable metals were stripped before it was preserved, so no copper tubes. The firebox still has the back plate (which was iron) but the water jacket (copper) is long gone.

(Some photos here: http://www.victorianweb.org/technology/railways/95.html)

Tom

pete2hogs · 29 мар 2018

Has Derwent got any tubes in it? I can't off hand remember which version of Hackworth's boiler designs it has - some had a single outward flue but return tubes.

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Last set of BR or older era boiler tubes?

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