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Analysis of Hull Coating Renewal in Ship Repairing

Lookup NU author(s): Dr Arun DevORCiD



This is the final published version of an article that has been published in its final definitive form by The Society of Naval Architects and Marine Engineers, USA, 2017.

For re-use rights please refer to the publisher's terms and conditions.


Hull-coating (blasting and painting) renewal (repair) of a ship is a part of the routine maintenance works of a ship. It is carried out only when the ship is in a dock (graving dock, floating dock or slipway). For a routine maintenance schedule, hull coating repairing works dictate the duration of stay of a ship in the dock. Therefore, it is very vital to get the correct information about the hull coating repairing scope of works, prior to docking, to maintain the dock operation schedule; dry-docking duration. Presently, the scope of hull coating repairing works is decided on the spot after the ship’s bottom inspection jointly carried out by the representatives of the owner, the shipyard and the paint manufacturer/supplier. Most of the time, the inspection result does not match with the pre-planned dock operation schedule. Hence, the overall dock operation schedule gets affected due to delay or early undocking of a ship.Coating repair and related information for 149 cargo ships were collected from a single shipyard. Coating repair data were analyzed and presented in both tabular and graphical forms to show the behavior of quantity of coating repair on age, deadweight and type of ships. The physical size of a ship has a great influence on the hull blasting and painting repairing works irrespective of design parameters of the ship. An approach for preliminary estimation of blasting and painting prior docking is proposed based on ships’ dimensions and the actual area of hull and the various hull locations. In this paper, the authors have made an attempt to identify the independent variables that influence the coating repairing scope (the dependent variable) and their inter-relationship.Data analysis of 149 cargo ships of various ages, deadweights, and types suggest that all these items (independent variables) have influences on the scope of hull coating repairing works, and those are linearly associated.

Publication metadata

Author(s): Dev AK, Saha M

Publication type: Article

Publication status: Published

Journal: Journal of Ship Production and Design

Year: 2017

Volume: 33

Issue: 3

Pages: 197-211

Print publication date: 01/08/2017

Online publication date: 23/08/2016

Acceptance date: 25/07/2016

Date deposited: 14/01/2019

ISSN (print): 2158-2866

ISSN (electronic): 2158-2874

Publisher: The Society of Naval Architects and Marine Engineers, USA


DOI: 10.5957/JSPD.33.3.150037


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