RT Journal Article T1 A method for obtaining the preventive maintenance interval in the absence of failure time data A1 Sánchez Herguedas, Antonio A1 Mena Nieto, Ángel Isidro A1 Rodrigo Muñoz, Francisco AB One of the ways to reduce greenhouse gas emissions and other polluting gases caused by ships is to improve their maintenance operations through their life cycle. The maintenance manager usually does not modify the preventive intervals that the equipment manufacturer has designed to reduce the failure. Conditions of use and maintenance often change from design conditions. In these cases, continuing using the manufacturer's preventive intervals can lead to non-optimal management situations. This article proposes a new method to calculate the preventive interval when the hours of failure of the assets are unavailable. Two scenarios were created to test the effectiveness and usefulness of this new method, one without the failure hours and the other with the failure hours corresponding to a bypass valve installed in the engine of a maritime transport surveillance vessel. In an easy and fast way, the proposed method allows the maintenance manager to calculate the preventive interval of equipment that does not have installed an instrument for measuring operating hours installed. PB Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne SN 1507-2711 SN 2956-3860 (electrónico) YR 2022 FD 2022 LK https://hdl.handle.net/10272/21962 UL https://hdl.handle.net/10272/21962 LA eng NO Sánchez-Herguedas, A., Mena-Nieto, Á., & Rodrigo-Muñoz, F. (2022). A method for obtaining the preventive maintenance interval in the absence of failure time data. In Eksploatacja i Niezawodność - Maintenance and Reliability (Vol. 24, Issue 3, pp. 564-573). Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne. https://doi.org/10.17531/ein.2022.3.17 NO This research was funded by the “Consejería de Transformación Económica, Industria, Conocimiento y Universidades de la Junta de Andalucía” and by the European Regional Development Fund (FEDER), within the framework of the FEDER of Andalusia 2014-2020 Project Reference UHU-202031, and by the grant Ref. RTI2018-094614-B-I00 (SMASHING Project) into the “Programa Estatal de I+D+i Orientada a los Retos de la Sociedad” funded by MCIN/AEI/ 10.13039/497 501100011033. DS Repositorio Institucional de la Universidad de Huelva RD 14 jul 2026