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Thread: Destroyers - Fletcher Class

  1. #3586
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    Quote Originally Posted by FlankDestroyer View Post
    Can you give me a run down of when the Fuel Oil heaters were used in the Fuel Tanks? Were they used when it was quite cold ….. like in the North Atlantic?
    FlankDestroyer. Tank heaters were run off 150lb Aux steam, with the manifolds in the firerooms and they were run by the Oil King I believe. Although NSFO was easier to pump than bunker "C" as it was lighter "High Test Black Oil" therefore did not require a temp higher than 100 Degree F. to pump. Usually pumped at a temp of 80-90 Degrees. The tank heaters would generally be cut in at least on low most if not all of the time depending what the injection temp was (injection temp is the temp of the seawater entering the main condensers). So you are correct the North Atlantic they would cut in the tank heating coils most likely all the way. If you were going to the South Pacific not so much, however most ships tried to keep a constant temp about 90 degrees, as the oil itself expanded and contracted with heat and cold. Unless the oil was a mean temp of about 90 it was difficult to ascertain just how much fuel you had or if you were receiving fuel from a tanker it was difficult to reconcile the tankers gallon figures with yours, unless the temp was constant.
    So the short answer is most ships kept the heaters at least on low most of the time, if not all the time.

    Note: never fill a storage/bunker tank full to the top with black oil. if the oil became hotter than when pumped the oil in the tank increased in temp, it would expand and go out the tank vents, the oil king and BT's would have a mess on their hands! All tanks were vented to the outside with 2" or larger diameter pipes with a gooseneck and a vent check valve and fire screen. These may be seen along the main deck and some on the 01 level exterior bulkhead at various locations all around the house on the fletchers. They look like inverted U with one side cut off 3/4 way from the deck and a bell attached. A form of the same apparatus is still in use today.

  2. #3587
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    Thanks again!

    One of my first "stations" was on the 01 forward fueling station. With the pigtail and trunk fueling it was "sometimes" not a perfect evolution so more than a few drops of NSFO reached our young bodies. Just don't remember the fuel being that hot but we were off Long Beach/San Diego. Fueling to the brim was kind of important with the Fletchers and Sumners as we did not have the legs sometimes especially when racing around near 30 knots. So we cut if very close sometimes. Too close on occasion! I seem to remember potential water in the fuel issues as well and securing the tank heaters.

    Frankly the gas gages on these ships were kind of primitive kinda like a dip stick or a sounding tape.

  3. #3588
    Senior Contributor blidgepump's Avatar
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    Fuel Tank Vent ....

    Quote Originally Posted by Boilermaker9 View Post
    FlankDestroyer.

    ......... " All tanks were vented to the outside with 2" or larger diameter pipes with a gooseneck and a vent check valve and fire screen. These may be seen along the main deck and some on the 01 level exterior bulkhead at various locations all around the house on the fletchers. They look like inverted U with one side cut off 3/4 way from the deck and a bell attached. A form of the same apparatus is still in use today.
    This may be what you're referring in addressing the "VENT"?
    Attached Images Attached Images   
    Last edited by blidgepump; Today at 04:02.

  4. #3589
    Senior Contributor blidgepump's Avatar
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    ... and on the starboard side...

    Here are a couple of pictures from the starboard side of a Fletcher Class - DD illustrating the fueling port and rigging points.
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  5. #3590
    Senior Contributor blidgepump's Avatar
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    Fuel Oil Pressure....

    Quote Originally Posted by Boilermaker9 View Post
    FlankDestroyer. Tank heaters were run off 150lb Aux steam, with the manifolds in the firerooms and they were run by the Oil King I believe. Although NSFO was easier to pump than bunker "C" as it was lighter "High Test Black Oil" therefore did not require a temp higher than 100 Degree F. to pump. Usually pumped at a temp of 80-90 Degrees. .
    It appears the fuel oil pressure was redlined at 350 # psi ? this gauge remains attached to fire box # 2. Note the label gun sticker, too.
    The second picture captures the remains of a cooling water and feed pressure gauge?
    Seems I recall that DD's operating in the south Pacific did not fire as well due to the warm ocean temps?
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