Maritime inventory shipping problems

These decisions are made based on the inventory and production constraints as well as the cost rates offered for different types of ships by the ship operators. 

Due to the great variety of ship types available for chemical transports (in particular among gas tankers) it seems reasonable to reflect this option by modelling a heterogeneous 

Ethylene can be transported efficiently under super-cooled conditions only. For most other basic chemicals also liquefaction by pressure is possible. See Stopftjrd (2009). 

Thble 3.17 Sets, parameters, variables, and decision variables for the MISP-STA 

Since it is assumed that tankers are chartered for a specific transport order, it is reasonable to assume that a time-dependent charter rate is charged when a tanker is booked. Hence, the charter costs on Unk (j, j) e X are calculated by a charter rate per period multiplied by the trip s duration Furthermore, port fees are to be expected de- 

---