Nearly all ship sizes can be unloaded/loaded pneumatically.  From Post-Panamax size to little barges and all other kinds of ships.   Even tankers with small hatches - as there is only space needed in the diameter of the conveying pipeline.

Capesize ~ 80.000 dwt and greater ~ 42 m width
Panamax ~ 60.000 to 80.000 dwt ~ 32 m width
Handymax ~ 40.000 to 60.000 dwt ~ 30 m width
Handysize up to 40.000 dwt ~ 23 m width
Barges all sizes ~ all sizes

Of course, all kinds of other containers, bins, trucks, railcars, stores etcetera can be unloaded and/or loaded.

More details about ship sizes (pdf)

NEUERO    Technology    Ship Sizes