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[edit] Good article review
I've reviewed the article, I believe the concerns from the previous review have been addressed with a number of good secondary sources now used and correct PD tags added to the relevant images. Thus, I'm happy to make the article a good article. The Rambling Man 12:35, 14 July 2007 (UTC)
Hello! I have changed the wikilink to priming, which is a dab page, in the "Cylinder design" section so that it links to [[Priming (steam engine)]] instead. Note that this is a redlink. I didn't want to leave the link to the dab page, but there are no suitable targets on the dab page, and I suspected that this topic might be worth its own article. If not, please remove the link entirely. Thanks. --Tkynerd 04:25, 9 September 2007 (UTC)
- Not an expert in the field, however I do know for a fact that priming has nothing to do with cylinder design, but may be traced to water carry-over from the boiler. It is mainly linked to impurities in the water making it foam up, fill the steam space and get drawn down the the steam collector pipe. Bulleid was the only British locomotive engineer to address the problem of water quality, adopting the French TIA (Traitement Intégral Armand) on-board water treatment system, doing so with great success so I am surprised that the subject of priming should come up in article on his work. However the man who really solved the whole problem, including priming, was L.D. Porta in the 1970s in Argentina. Boiler Water quality and treatment method is a huge subject, certainly worth its own article. In the meantime, I suggest you follow these links: [1]; [2]--John of Paris 17:40, 15 September 2007 (UTC)
- Well, to be honest, all I was really interested in was getting the dab link fixed so it points to an appropriate target. I could have simply removed the wikilink, but in this case I decided there was a possibility that the subject might deserve its own article. The further research and any changes should be carried out by someone directly concerned with this article. Just, please, don't restore the link to Priming without a dab! :-) --Tkynerd 01:06, 16 September 2007 (UTC)
- When I wrote the above comment, it hadn't hit me yet that when I'd looked at the "Cylinder design" section again, the link was no longer a redlink. User:Bulleid Pacific has created Priming (steam engine). Excellent, thanks! --Tkynerd 01:09, 16 September 2007 (UTC)
- Going on from my comments above, what is being described in the new article is not generally called "priming" and probably involves greater quantities of water. Of course it also involves water-throwing from the chimney, but that is avoided by opening the drain cocks and with piston valves this is a must, otherwise you run the risk blowing off the cylinder covers. With slide valves the danger is less as they will lift off their faces; even so, I would imagine that repeatedly allowing that to happen would not do the exhaust edges much good. What I think Bulleid was hoping to lessen with his valve design would have been condensation due to pressure drop resulting from expansion in the cylinders and the cooling of the steam as a result of giving up heat due to work? The condensation would take the form of droplets in suspension - or wet steam. This would not lead to priming, but to loss of efficiency. It could be counteracted by high superheat giving a greater temperature gradient and/or in some cases by steam jackets that kept the cylinders hot. Bulleid was obviously hoping for a jacket effect from the encircling sleeve valves, however, I suspect it could be shown that such would not have been the case — but that's another story.--John of Paris 11:30, 17 September 2007 (UTC)
[edit] R.G. Jarvis??
Just one more thing. Surely it is not correct to count R.C Jarvis as one of the designers of this locomotive. He had nothing to to with the design. He simply concluded after tests that it would have needed a complete redesign to have any success.--John of Paris 17:51, 15 September 2007 (UTC)
[edit] Interchangeable bogies?
Just think about it. Any bogie is by definition an interchangeable component. It would be hard to make it otherwise. So I don't see how it could have been "at Bulleid's insistence". He probably recommended keeping a pool of extra bogies in order to save time off the road. That would seem logical. But to say that it proved an "ineffective measure" is patently absurd, as there was never an opportunity to put it into effect! Five locomotives were being built, only one of which actually ran and that never reached full operating order.--John of Paris (talk) 18:41, 12 March 2008 (UTC)
GA
