Thx, guys.
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Am I correct in assuming that the large pipe on the fantail is the main fueling point and these ships would pass fuel only while stationary, or by floating/dragging the hose behind them?
Not exactly. At the end of that pipe is a "Y" shaped fitting for attaching a UNREP hose. If you look at the overhead, you'll see that there are seven such end fittings. Refueling was conducted both side by side as well as fore and aft. There are photos of ships being refueled in all these positions. It is true that the hoses were floated/dragged for fore and aft refueling. Not the side by side.
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I seem to recall from "Shattered Sword" that underway refueling was the one thing the Japanese were very deficient at, and never really sorted out during the war.
There is some truth in that, but I think it a bit more nuanced. The IJN was well acquainted with UNREP; they'd been doing it since the 1920s with their Erimo and Shiretoko class oilers (USN Kanawha class tanker was their contemporary in most aspects). The IJN recognized the need for a larger and faster ship, which resulted in the Kawasaki type. These ships were owned and operated by private Japanese shipping companies until requisitioned and re-equipped with UNREP equipment by the IJN right before the war. So, it was just a matter of the learning curve, which was ramped up significantly in the months leading up to Pearl Harbor.
Most of these ships were assigned to the fleet train/supply force for UNREP throughout the war. However, the IJN did not conduct ongoing fleet operations, so many were the times that the Kawasakis anchored and acted as fuel depot ships for the fleet, or even were used in a regular tanker capacity, merely to convoy oil from oil fields to Japan.
The USN Cimarron class tanker was the US response to the same need. The difference between the USN and the IJN is that some of the Cimarron ships were dedicated from the outset as UNREP ships, so the experience reservoir for the USN was larger at the outset of the war. IIRC, the problem for the USN was that they had a very limited number of these vessels at their disposal for the first year or so, fewer than the Japanese.