Abstract: Warship integrated refrigerant systems may provide security for the cooling of electronic equip-ment, overcoming the problems of low reliability, short lifetime, and high costs etc. It may also reduce the resource consumption, optimize the system design, and realize the comprehensive utilization of cooling re-sources. Therefore, damage detection and management of this element is of vital importance to the warship damage control system. Based on the introduction and analysis of integration of warship refrigerant systems and warship damage control systems, this paper presents the damage detection and diagnosis of sensors of a refrigerant system by using Principal Component Analysis (PCA), which is further validated on the simula-tion platform of a water system. Particularly, the PCA model is established based on the normal operation data measured by pressure sensors of the water system. This model explains the systematic variance above 95%, and the confidence limit is 1.639 4. When one pressure sensor is damaged (i.e. fault), the Q-statistic of the operation data exceeds the confidence limit, indicating that some pressure sensor could be in fault. The Q-contribution shows that the measurement from the faulty sensor has the highest contribution from 45% to 75%. In addition, the faulty sensor can be isolated based on the Q-contribution plot. This paper fur-ther proposes the ways for damage detection and diagnosis of the pipe network of the warship integrated with refrigerant systems by considering the case under normal time and wartime together.