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Post by hollyhiccups on Nov 2, 2011 13:36:38 GMT
At sub surface stations there is a lot of wind - from the piston effect. The forced airflow through the tunnels, caused by the carriages. Does any one know the speed of these winds? What problems these cause? Which areas of the platforms and stations are most affected? Thanks
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Tom
Administrator
Signalfel?
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Post by Tom on Nov 2, 2011 16:15:45 GMT
IIRC the report into a derailment on the Central Line a few years ago (where material was blown from a cross passage into a running tunnel) suggested the cross-winds could be as high as 80mph.
The normal ones on a platform are probably less so, around the speed of a train I would assume.
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Post by chrisvandenkieboom on Nov 2, 2011 16:31:34 GMT
You probably mean deep level stations. If there is lots of wind in a sub surface station, I'd recommend you to go somewhere deeper, as there's a pretty big storm going on on the surface
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rincew1nd
Administrator
Junior Under-wizzard of quiz
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Post by rincew1nd on Nov 2, 2011 19:37:37 GMT
You probably mean deep level stations. If there is lots of wind in a sub surface station, I'd recommend you to go somewhere deeper, as there's a pretty big storm going on on the surface Either that or AI has cooked that delicious Lentil thing again for MRFS.
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Deleted
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Post by Deleted on Nov 23, 2011 17:07:50 GMT
Holly,
Have you recently spent a day on LU?
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Post by hollyhiccups on Jan 22, 2012 10:55:34 GMT
Hi Harry! Sorry I havent logged on here in a while. Yes I did spend a day on LU! Doing all sorts of interested things - the very kind team at Earls Court control room showed me round
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pitdiver
No longer gainfully employed
Posts: 439
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Post by pitdiver on Jan 22, 2012 19:20:25 GMT
Talking of wind. In years gone by we would have "Secret Shoppers" visiting stations with a check list of things to look for, "Secretly" of course. There would be two visits supposedly independent of each other. On one visit one of these "Secret Shoppers" complained that it was very windy on our platform as the trains approached. What did they expect.
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Deleted
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Post by Deleted on Jan 23, 2012 2:10:11 GMT
Ah! I put two and two together regarding your visit to Hell's Caught! I wasn't there on the day but it was mentioned. Anyway I once nearly had an issue with the street level door at Down Street owing to trains coming in both directions meaning that I couldn't hold the large metal door and had to quickly step away!
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Deleted
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Post by Deleted on Feb 3, 2012 8:18:16 GMT
I recall reading that this was a significant factor in the spread of the King's Cross fire in 1987 and I suspect that there are a number of areas where it has to be taken into account when evaluating the system safety. I wonder, however, are there any areas where it can be used positively? For example, has any work ever been carried out to try to use it as a force to expel hot air from the tunnels during the summer?
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Deleted
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Post by Deleted on Feb 5, 2012 23:44:46 GMT
I wonder, however, are there any areas where it can be used positively? For example, has any work ever been carried out to try to use it as a force to expel hot air from the tunnels during the summer? As I understand it, the piston effect is a key part of ventilating the underground. I seem to remember that in the days following the 7/7 incident, the recovery crews at Kings Cross / Russell Square had great difficulties caused by the lack of ventilation.
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Post by trt on Feb 6, 2012 10:14:20 GMT
It the parks are the lungs of London, the underground lines are the bronchi.
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