I was talking to gentleman earlier today concerning offshore fuel storage tanks; the requirements called for the ability to lift the tanks off the supply boat to the platforms. MINI ISO tanks are commonly used for offshore chemical shipments and or fuel distribution.
What about size? Well, they are called MINI ISO Tanks for a reason; they happen to be half the physical size of a full ISO tank. 10ft x 8ft x 8ft tall. The options currently available are used carbon steel units, or build new ones to your specific needs.
Note: MINI ISO tanks have the physical properties noted above, regular offshore tanks can vary in frame design, size and orientation.
Here are a few pictures…
Tank Service Inc- ISO Tank Blog 