Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.compchemeng.2003.08.009
Title: Improving the logistics of multi-compartment chemical tankers
Authors: Jetlund, A.S.
Karimi, I.A. 
Keywords: Chemical shipping
Dynamic scheduling
Maritime transportation
Multi-commodity
Routing
Transshipment
Issue Date: 15-Jul-2004
Source: Jetlund, A.S., Karimi, I.A. (2004-07-15). Improving the logistics of multi-compartment chemical tankers. Computers and Chemical Engineering 28 (8) : 1267-1283. ScholarBank@NUS Repository. https://doi.org/10.1016/j.compchemeng.2003.08.009
Abstract: Ocean transportation is the workhorse for logistics in global chemical supply chains. Often, logistics cost can be as high as 20% of the purchasing cost. Efficient routing and scheduling of multi-parcel chemical tankers to reduce logistics expenditure is important for both chemical and shipping industry. We consider the maximum-profit scheduling of a fleet of multi-parcel tankers engaged in shipping bulk liquid chemicals. For this, we present a mixed-integer linear programming (MILP) formulation using variable-length slots and propose a heuristic decomposition algorithm that obtains the fleet schedule by repeatedly solving the base formulation for a single ship. The formulation is generally applicable to all kinds of carriers engaged in the transportation of multiple commodities, and to transportation systems where frequent schedule updates or a short-term planning horizon is required. We illustrate our approach on a real industrial case study involving 10 tankers, 36 ports and 79 cargos. Our approach showed an increase of 32.7% in profit as compared to the plan actually used by a major chemical shipping company. © 2003 Elsevier Ltd. All rights reserved.
Source Title: Computers and Chemical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/64073
ISSN: 00981354
DOI: 10.1016/j.compchemeng.2003.08.009
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