Comments by "Gregory Wright" (@gregorywright4918) on "A ship that refused to die - USS Marblehead, her crew and a voyage around the world" video.
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I believe Norman Friedman's book on US Cruisers gives detail on fuel load and "projected" range, but that depends heavily on what speeds she makes. The Omaha class was designed for high speed (>30kts), and at that speed she will eat through her fuel very quickly. They actually had a higher "cruising" speed than others due to the design of the high speed turbines, so they were a little less efficient at cruising speeds that other ships preferred. As to refueling underway, that is also a "depending on speeds made" and also depending on what she was doing. Cruising across the Pacific would require planned stops or underway refueling, but cruising from port to port in the South Atlantic would usually not.
Drach has addressed the light-off boilers question in several places, from his video on boilers to a few Drydocks. The basic issue is what state they are in to begin, since most ships keep at least one lit to provide steam for generators for the "house load" when in port. If she is tied to dock doing maintenance (with shore electrical supply) or in drydock, she will douse all boilers, but then she is hardly likely to get an emergency sortie order there. In general it takes several hours to get a cold boiler ready to provide steam, but a smaller ship like an Omaha may be able to get underway on a single boiler as the others are being lit off.
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