Created on:2021-08-30 14:11

Fault diagnosis and maintenance of marine hydraulic equipment_ Measures to reduce faults of marine hydraulic equipment

Fault diagnosis and maintenance of marine hydraulic equipment_ Measures to reduce faults of marine hydraulic equipment

Hydraulic system is a complex system composed of many equipment components and pipelines. With the extension of service time, the probability of failure of hydraulic equipment is shown in Figure B, including three stages: early failure period, accidental failure period and wear failure period. The maintenance personnel shall take different measures according to the different characteristics of the three failure periods to ensure the good use of hydraulic equipment. The failure of hydraulic equipment is closely related to the maintenance of marine engineers and the correct operation and use of operators, in addition to the failure of design, manufacturing and installation to meet the specification requirements and the normal wear of equipment parts.

① Regular and scientific maintenance of marine hydraulic equipment and systems is the key to reduce their failures


Most of the hydraulic equipment on board are located on the open deck and are often affected by wind, sun, rain, marine climate and natural conditions. Once there is a fault, it is bound to affect the normal production and safety of the ship. Therefore, scientific regular maintenance is of great significance to improve the reliability of hydraulic equipment.

Avoiding and reducing the pollution of hydraulic oil is the key to reduce the failure of hydraulic equipment. According to statistics, 70% ~ 80% of ship hydraulic equipment failures are related to hydraulic turbid pollution, which is the main cause of hydraulic equipment failures. Figure C shows the causes of hydraulic oil pollution.


It can be clearly seen from the figure that the hydraulic oil pollution is largely related to the maintenance of management personnel. Therefore, improving the management level of managers and scientific and regular maintenance can effectively reduce the pollution of hydraulic oil and reduce the failure of hydraulic equipment. One of the reasons for the above two failures is that the hydraulic oil has not been replaced for a long time, resulting in deterioration, oil pollution and equipment failure. The following measures can be taken to strengthen the management of hydraulic oil.

a. Correctly manage the new oil, avoid the exposure of the unsealed new oil to the atmosphere, reduce the contact with air, moisture and other impurities, and be sure to pass through the fine filter when adding hydraulic oil to prevent impurities from entering the system.

b. Test the quality of hydraulic oil in strict accordance with the requirements of the manual, and replace all exceeding the specified requirements;

c. Wash the coarse and fine filters frequently, strengthen the maintenance of the system, reduce the leakage of the system and prevent air from entering the system. Pay attention to cleaning during maintenance to prevent foreign matters and impurities from entering the system.

d. Adjust the cooling water volume in time according to the changes of ambient temperature and seawater temperature to prevent excessive oil temperature and oil deterioration.

Daily inspection and regular maintenance is an important guarantee to reduce the failure of hydraulic equipment. Due to the particularity of the ship itself, the ship's hydraulic equipment is often in the midst of vibration and swing and seawater corrosion. Through daily inspection and regular maintenance, a system is formed, which is conducive to reducing the loss of hydraulic equipment, avoiding faults and improving the safety of the ship. Maintenance can be carried out in the following aspects.

a. Check the hydraulic system before operation. Check the oil level and quantity of the system, whether the joint valve parts leak and whether the moving parts are blocked, so as to ensure that all equipment in the system is in good condition.

b. Inspection during system operation. During operation, check the operation status of all equipment of the system by looking, smelling, listening and touching. In case of abnormal phenomena such as noise, pressure fluctuation, leakage and vibration, immediately analyze and find out the causes, eliminate potential safety hazards and ensure the operation safety of the system.

c. Regular maintenance of hydraulic equipment and system. Reduce pipeline leakage, check and replace rubber bands of vulnerable parts that are easy to age, and maintain the transmission and moving parts of the actuator to prevent rust and reduce operation resistance.

② Improving the quality of maintenance managers and operators is an effective way to reduce faults.

Strengthen the combination of theoretical learning and practical training to improve the ability of maintenance managers to analyze and solve faults.

Maintenance personnel often prepare some books on hydraulic technology during their stay on board, and use the spare time of cabin personnel to discuss and learn in combination with the relevant instructions of hydraulic equipment on board, so as to enhance the managers' understanding of the principle of hydraulic system and the structure of hydraulic equipment, so as to facilitate maintenance and management; At the same time, each fault is analyzed in detail and experience is exchanged to improve the ability of managers to judge and deal with hydraulic equipment faults. Through the above learning and experience exchange, the ability of management personnel to manage, analyze and solve faults is improved to ensure the safe operation of hydraulic equipment. The above failure of "too slow action speed of windlass" is largely due to the lack of knowledge and experience of maintenance personnel.

Improve the operating level of operators, urge them to operate in strict accordance with the specified operating procedures, and eliminate illegal operations. The hydraulic equipment and systems on the ship are generally maintained by the personnel in the engine room, and the operation is the responsibility of the personnel in the deck department. In this way, because the operation and maintenance belong to different departments, there is bound to be such a misunderstanding: the operator will think that he does not need to repair the equipment if it fails anyway. If the ship owner investigates the responsibility, it is also the responsibility of the engine room maintenance personnel. Therefore, they may operate in violation of regulations or do not operate according to the operating procedures, which will bring serious potential safety hazards to the hydraulic system and equipment.


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