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Analysis of structural steel renewal weight in ship repairing

Lookup NU author(s): Dr Arun Dev

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Abstract

Structural steel renewal (repair/replacement) is carried out as a part of routine maintenance of a ship during its service life. Structural steel renewal is a result of the structural deficiencies beyond the limit set by the classification societies, either regarding scantling (reduction in thickness) or structural deformations (yielding, buckling, bulging, etc.) or both. Reduction in thickness of steel (mainly caused by corrosion) and distortion (mainly caused by ship motion and damage due to cargo) are due to many particular natural phenomena. Structural steel replacement cost is the highest in a ship repairing invoice for a ship owner, and it also consumes the maximum resources from a shipyard. Hence, prior information about the scope of structural steel replacement might help the ship owner with proper budget allocation and schedule to meet the financial commitment. It may also help the shipyard to prepare a realistic time and berthing plan by optimizing its resource allocation and utilization.Structural steel repair (weight in kg) related information for 123 cargo ships of various ages, deadweight and types were collected from a single shipyard. Structural steel repairing data were then analyzed and presented in both tabular and graphical forms to show the behavior of structural steel repair as a function of age, deadweight, type, cubic number and gross tonnage of ships.In this article, the authors have made an attempt to identify those independent variables that influence structural steel renewal (the dependent variable) and their inter-relationship.


Publication metadata

Author(s): Dev AK, Saha M

Publication type: Article

Publication status: Published

Journal: Journal of Ship Production and Design

Year: 2019

Volume: 35

Issue: 2

Pages: 139-169

Print publication date: 01/05/2019

Online publication date: 16/05/2018

Acceptance date: 16/04/2018

ISSN (print): 2158-2866

ISSN (electronic): 2158-2874

Publisher: The Society of Naval Architects and Marine Engineers (SNAME)

URL: https://doi.org/10.5957/JSPD.170008

DOI: 10.5957/JSPD.170008


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