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4216. Performance analysis of liquid bulk terminals
Invited abstract in session WD-62: Port Performance, stream OR in Port Operations.
Wednesday, 14:30-16:00Room: S12 (building: 101)
Authors (first author is the speaker)
| 1. | Werner Scheinhardt
|
| Applied Mathematics, University of Twente | |
| 2. | Jan-Kees van Ommeren
|
| Applied Mathematics, University of Twente | |
| 3. | Debjit Roy
|
| Production and Quantitative Methods, Indian Institute of Management Ahmedabad |
Abstract
Bulk liquid terminals play a crucial role in timely (un)loading of liquids from tankers and facilitating transport to and from the hinterland via pipelines, trains or trucks. At an import terminal, arriving tankers berth to be unloaded via loading arms and pipelines connected to storage facilities. Whenever the storage is full, the unloading rate essentially decreases to the drain rate of the storage, which increases the sojourn times of tankers considerably. On the other hand, when the storage is empty, the demand on the landside cannot be met and throughput will decrease.
The performance of an import terminal serving a single liquid type can be analyzed using feedback fluid queue models, assuming that tankers arrive according to some random process, carrying random amounts of liquid, and experiencing delay when the berth is in use. Importantly, such models explicitly take into account the interaction between tankers and storage reservoir. In this talk we focus on the more complex case with two types of liquid that cannot be mixed, each with their own storage reservoir and tankers, while sharing the same (single) berth. A straightforward fluid queue model is then no longer applicable, but we apply an iterative approximation scheme that performs remarkably well. We present graphs showing how the various parameters influence the behavior of the main performance measures, viz. the expected sojourn times of both types of tankers and the throughputs of both types of liquid.
Keywords
- Logistics
- Maritime applications
- Queuing Systems
Status: accepted
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