- n. Water added to a boiler to replace that lost during operation
“They did this with the manual control valves on the main emergency feedwater system, putting stuff around them so thickly that during the TMI accident an operator had to literally hang by his knees from an overhead pipe and attempt to open them (these are hatch-size wheels) sans leverage.”
“Recall that 6 POUNDS of uranium fuel clogging a resin line in the standby demineralizer caused the accident, that lousy core had done an incurable job on the plant well before water got sucked into the stupidly designed instrumentation air supply (tripping both main and emergency feedwater supplies).”
“Small-break LOCA [and pressure leak], total loss of feedwater (heat exchange) for 8 minutes (steam generators boiled dry at 2 minutes), scram failure at core central, hot leg's off the scale.”
“I think there is a bit of a nomenclature issue: feedwater is essentially condensate.”
“You are talking about feedwater for steam engines and the assumptions seems to be that seawater would be used.”
“What I am getting out of this is that it is there was a significant motivation for steamship engineers to measure feedwater temperatures for boilers and condensers from very early on and to scrupulously record it in order to learn from experience.”
“For a normal steam engine, the feed water is not where you measure sea water temps. you measure it at the inlet to the main condenser on the seawater side, not the feedwater side.”
“Given that the feedwater was pre-heated, presumably to a desired temperature, it seems reasonable to assume that fixed thermometers could have been used to measure the temperature of feed water from quite early on.”
“My point still stands, I think: there could have been all kinds of arrangements tried for measuring feedwater temperature; and it is far from clear when this started – it could have been many decades before the date of 1941 quoted.”
“But a normal Rankine cycle condenses feedwater with seawater doing the cooling.”
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