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The term priming applies to the carry-over from the boiler, and the water in the cylinder is the effect of this. The more common cause of water in the cylinder, however, is condensation when steam is first admitted to a cold cylinder: thus the cocks are always open when the loco is starting. When they are opened at the end of a run it's because it's good practice to have them so while the loco is stationary: it prevents any build-up of pressure in the cylinders if there's a bit of a leak past the regulator—many a loco has run away with itself for this reason. This comes from personal knowledge (no, not the running away!) which isn't allowed here of course, but I'm confident that I have sound sources to insert when I can find a couple of minutes. -- Old Moonraker ( talk) 20:31, 3 October 2008 (UTC)
The whole subject of engine damage due to water in the cylinder seems ridiculous, and the solution obvious. Install two pressure relief valves on opposite ends of the cylinder head, which only trigger at pressures slightly beyond normal operation... such as if liquid is being compressed in the cylinder head. Problem solved. This would also solve hydrolock on gas and diesel engines. DMahalko ( talk) 02:05, 12 December 2011 (UTC)
So non-locomotives never suffer from priming? Why is it that discussing page moves beforehand is never done these days? 8-( Andy Dingley ( talk) 00:23, 10 November 2013 (UTC)
![]() | This article is rated C-class on Wikipedia's
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The term priming applies to the carry-over from the boiler, and the water in the cylinder is the effect of this. The more common cause of water in the cylinder, however, is condensation when steam is first admitted to a cold cylinder: thus the cocks are always open when the loco is starting. When they are opened at the end of a run it's because it's good practice to have them so while the loco is stationary: it prevents any build-up of pressure in the cylinders if there's a bit of a leak past the regulator—many a loco has run away with itself for this reason. This comes from personal knowledge (no, not the running away!) which isn't allowed here of course, but I'm confident that I have sound sources to insert when I can find a couple of minutes. -- Old Moonraker ( talk) 20:31, 3 October 2008 (UTC)
The whole subject of engine damage due to water in the cylinder seems ridiculous, and the solution obvious. Install two pressure relief valves on opposite ends of the cylinder head, which only trigger at pressures slightly beyond normal operation... such as if liquid is being compressed in the cylinder head. Problem solved. This would also solve hydrolock on gas and diesel engines. DMahalko ( talk) 02:05, 12 December 2011 (UTC)
So non-locomotives never suffer from priming? Why is it that discussing page moves beforehand is never done these days? 8-( Andy Dingley ( talk) 00:23, 10 November 2013 (UTC)