A basic distinction can be made between uncontrolled and controlled arrival processes. Uncon- trolled arrivals are typically modeled by a Poisson process, a common assumption, for example, in modeling incoming telephone calls in call center simulations. Controlled arrivals concern scheduled arrivals, such as scheduled airline flight arrivals to an airport (Banks, 2000). For our port system we distinguish two types of controlled arrivals. The first type are the so-called stock-controlled arrivals, i.e., ship arrivals are scheduled in such a way, that a base stock level is maintained in the plant’s tanks. The second type is based on equidistant arrivals per ship type and relates to contracts prescribing product supply and pick-up at regular time intervals, e.g., once a month. We compare model outcomes based on four different arrival processes: uncontrolled, stock-controlled, equidistant and a blend of stock controlled arrivals for the larger ships and equidistant arrivals for the smaller ones. Furthermore, for all four types of arrival process, it is investigated to what extent careful allocation of ships to the jetty’s mooring points enhances system performance