A methodology to assess the downtime of a multi-phase offshore floating bulk transshipment operation

Yijun Wang, Alex van Deyzen, Willemijn Pauw, Rene Huijsmans

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

Operators who want to im- or export bulk (coal, iron ore, scrap, etc.) by means of offshore bulk transshipment often want to determine the operability of their bulk transshipment configuration in an early stage to assess if offshore floating bulk transshipment is a feasible option for im- or export of the commodity. The downtime of such offshore (un)loading operations may be unacceptably large. The operational windows may become limited. This implies insufficient im- or export volumes, which may result in large and expensive storage capacity onshore.
In this paper a methodology is proposed to assess the operability of offshore floating bulk transshipment. Offshore bulk transshipment is a multi-phase operation. For offshore operations consisting of multiple phases, persistency of the environmental conditions has to be considered. Persistency analysis allows for multiple operational phases, individual phase duration and shift of sea states during the operation.
The proposed methodology shows that using persistency data of the waves (wind and current are not considered yet), the downtime of an offshore floating bulk transshipment operation can be estimated more accurately. Compared to persistency analysis, scatter analysis (using wave scatter diagrams) resulted in an optimistic estimate of the downtime. Persistency analysis is better in demonstrating the influence due to each consecutive step on the total operability. This methodology could be further extended to other multi-phase offshore operations.
Original languageEnglish
Title of host publicationProceedings of the 35th International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publicationOffshore Technology; Offshore Geotechnics
Place of PublicationNew York, NY, USA
PublisherASME
Number of pages9
Volume1
ISBN (Print)978-0-7918-4992-7
DOIs
Publication statusPublished - 2016
EventASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016 - Busan, Korea, Republic of
Duration: 19 Jun 201624 Jun 2016
Conference number: 35

Publication series

NameASME Conference Proceedings

Conference

ConferenceASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2016
Abbreviated titleOMAE 2016
CountryKorea, Republic of
CityBusan
Period19/06/1624/06/16

Bibliographical note

Paper No. OMAE2016-54774

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