The pipelines and cable trays location problem in naval design Blanco Izquierdo, Víctor González Domínguez, Gabriel Pipeline routing Cable trays location Network design Matheuristics Naval engineering The authors of this research acknowledge financial support by the Spanish Ministerio de Ciencia y Tecnología, Agencia Estatal de Investigación, and Fondos Europeos de Desarrollo Regional (FEDER) via project PID2020-114594GB-C21. The authors also acknowledge partial support from projects: FEDER-US-1256951; Junta de Andalucía, Spain P18-FR-1422; CEI-3-FQM331; B-FQM-322-UGR20; AT 21_00032; NetmeetData: Ayudas Fundación BBVA a equipos de investigación científica 2019; Contratación de Personal Investigador Doctor (Convocatoria 2019) 43 Contratos Capital Humano Línea 2. Paidi 2020, supported by the European Social Fund and Junta de Andalucía; UE-NextGenerationEU (ayudas de movilidad para la recualificación del profesorado universitario); VII PPIT-US (Ayudas Estancias Breves, Modalidad A); and the IMAG-Maria de Maeztu grant CEX2020-001105-M /AEI /10.13039/501100011033. This paper deals with the determination of optimal locations for pipelines and cable trays in naval design. The problem consists of finding the number and types of cable tray routes to be created between various devices in order to minimize a user defined cost function. We reduce the problem to an ad hoc min-cost multicommodity flow problem with additional constraints imposed by technical requirements. This problem is solved for small-sized instances by using off-the-shelf optimization solvers. We also develop an exact relax-and-cut strategy that allows to handle medium-sized instances. For larger instances, we propose a family of heuristic algorithms consisting on the combination of two phases: (I) Construction of initial cable trays paths; and (II) Transformation to feasible cable trays verifying the technical requirements. For each of them, we also propose different strategies which give rise to several algorithms. These algorithms are compared on a computational experience using two types of instances: the first one based on random instances of different sizes and the second one based on instances with well-defined corridors to asses the availability of our methodology to enforce the creation of cable trays. Finally, we also analyze a real size case study provided by our industrial partner, Ghenova, a leading Naval Engineering company, validating our proposal to find solutions for this problem. 2023-09-06T11:31:38Z 2023-09-06T11:31:38Z 2023 journal article V. Blanco et al. The pipelines and cable trays location problem in naval design. Ocean Engineering 286 (2023) 115525. [https://doi.org/10.1016/j.oceaneng.2023.115525] https://hdl.handle.net/10481/84298 10.1016/j.oceaneng.2023.115525 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Elsevier