Question about Chinese steam locos

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muggins
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Question about Chinese steam locos

Postby muggins » Thu Jan 31, 2019 5:22 pm

Been watching a couple of Youchoob videos about the steam locos still working in Chinese opencast coal mines, which have reminded me to ask about something which has always puzzled me. Most/a lot of them seem to have a "box" round the chimney. What's that in aid of?

Bigmet
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Re: Question about Chinese steam locos

Postby Bigmet » Thu Jan 31, 2019 5:59 pm

I think that's probably the exhaust deflection system based on North American practise (the final designs of large Chinese steam borrow very heavily from North American concepts) often extended in the USA to form a 'Skyline' casing running the length of the boiler top to conceal all the tackle such as sandboxes, dome, steam manifold, safety valves...

muggins
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Re: Question about Chinese steam locos

Postby muggins » Thu Jan 31, 2019 7:11 pm

Cheers Bigmet. One of the videos I was watching is this one https://www.youtube.com/watch?v=iZMnAvss89o and there's a good view of this box thing at 9' 25". I must admit I'm struggling to see how that works as a smoke deflector, but maybe it does with Chinese smoke ...

21C1
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Re: Question about Chinese steam locos

Postby 21C1 » Thu Jan 31, 2019 7:48 pm

Could enclose a spark arrester, with all that coal about they won't want a spark to set it alight.

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End2end
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Re: Question about Chinese steam locos

Postby End2end » Thu Jan 31, 2019 10:05 pm

21C1 wrote:Could enclose a spark arrester, with all that coal about they won't want a spark to set it alight.

I see what you mean! :o
Thanks
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Kindling
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Re: Question about Chinese steam locos

Postby Kindling » Sun Feb 03, 2019 7:55 pm

21C1 wrote:Could enclose a spark arrester, with all that coal about they won't want a spark to set it alight.


Looking at 2:10 et seq, I don't there is much spark arresting going on!

Byegad
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Re: Question about Chinese steam locos

Postby Byegad » Wed Feb 06, 2019 9:12 am

I suspect it's for smoke deflection. Sparks are not such a problem with coal.

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Lysander
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Re: Question about Chinese steam locos

Postby Lysander » Wed Feb 06, 2019 10:26 am

Sand box ?

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Bigmet
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Re: Question about Chinese steam locos

Postby Bigmet » Wed Feb 06, 2019 11:21 am

muggins wrote:... there's a good view of this box thing at 9' 25". I must admit I'm struggling to see how that works as a smoke deflector, but maybe it does with Chinese smoke ...

Also North American smoke. There was a louvred 'air guide' at the front - and doubtless concealed gubbins inside - intended to create an updraft around the chimney and thus prevent the exhaust being entrained in the low pressure layer caused by airflow around the boiler. 'They' wouldn't let me climb up and inspect directly the one preserved specimen I have seen with this type of kit on it.

muggins
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Re: Question about Chinese steam locos

Postby muggins » Wed Feb 06, 2019 12:21 pm

Now that I can understand.

But I still think it's ugly :)


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