Extra Storage Tanks: Steel Storage Tank
A continuation of the beautiful mod, Extra Storage Tank by Aurora & Moonlight (publishing under the username of Anicha). It has been ported to Factorio 2.0 and also expanded/improved upon in various ways, according to my preference.
Features: The mod adds the Steel Storage Tank. It has a 7x3 footprint with two eccentric pipe connections, and may be rotated before placement. Capacity has been raised from 75k to 125k units (estimated from its visuals), the amount now being configurable as well! Tech research cost was reduced, because it felt too high for just a bigger tank (you still need to research Concrete). Recipe ingredient cost was modified and decreased overall as well, for the sake of balance, to more accurately reflect the physical dimensions, and to make the steel tank more steely.
Graphics & Sounds: New circuit connectors were created and properly fitted to the tank, while some very basic, custom remnants and a custom "death" animation of appropriate size and color were created for it. New inventory item sounds were applied as well.
Note on space efficiency: Compared to the Storage Tank, a single Steel Storage Tank holds the same volume within 45% of the space, while larger arrangements will have a rectangular footprint of 55-72% (depending on layout), due to the odd pipe connections. They are a noticeable improvement in any case.
Check out the related mod, Extra Storage Tanks: Tiny Storage Tanks, as well!