Talk:Chimney (locomotive)

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stovepipe chimney[edit]

What were/are the advantages of a stovepipe chimney81.132.121.238 (talk) 09:42, 29 February 2012 (UTC)[reply]

Cheap manufacture mostly. The aesthetics of the outside don't affect the draughting of the inside. Many engineers changed both at the same time, so some stovepipes (particularly Bulleid's) represented considerable invisible internal development too, but it wasn't the casing that was responsible. Andy Dingley (talk) 21:31, 29 February 2012 (UTC)[reply]

Blastpipe back pressure[edit]

"Pressure drop through the blastpipe nozzle was subtracted from the boiler pressure available to the steam pistons. Robert Stephenson estimated some locomotives lost half their power through blastpipe back pressure.[2]"

Think this sentence should read, "Pressure increase in the blastpipe was subtracted.." If the pressure dropped in the blast pipe, would this not assist the exhaust cyle and add to the pressure (differential) available from the boiler? Nickrz (talk) 03:37, 8 January 2017 (UTC)[reply]

It should be "drop", although I agree that it's unclear.

Exhaust pressure drops through the blastpipe. It can't do much else - where would the energy come from to increase it? Nor is it a divergent nozzle, thus using Bernoulli to increase the static pressure. There is a pressure at the inlet to the blastpipe equal to the exhaust pressure at the cylinders, and the outlet of the blastpipe is at atmospheric pressure.

"Pressure drop through the blastpipe nozzle was subtracted from the boiler pressure available to the steam pistons", is true, but unclear. It means that there's a pressure drop through the blastpipe, and that a pressure difference equal to that drop is thus not available for expansion in the cylinders. There might need to be a better way of wording this (ideas welcome), but it's not an increase in pressure. Andy Dingley (talk) 22:04, 8 January 2017 (UTC)[reply]

W.F.M. Goss[edit]

Shouldn't William_Freeman_Myrick_Goss be mentioned as per double Chimneys? Churchward built on Goss' work. 212.159.44.170 (talk) 12:20, 9 August 2019 (UTC)[reply]