HYDRAULIC OIL SYSTEM
Description And Function Of Components Of The Hydraulic Oil System
-Function
The hydraulic supply system supplies pressurized hydraulic oil for operation of actuators in the auxiliary systems. All associated parts are mounted on the hydraulic oil skid. Hydraulic oil is stored in a tank which is equipped with measuring instruments that determine status and are used for protection functions. Hydraulic oil is forwarded from the storage tank by one of the two redundant pumps. If the first pump sustains an outage, the standby pump automatically starts up to ensure uninterrupted supply of hydraulic oil. Measuring instruments that monitor system status are locally mounted on the skid.
The cleanliness of the hydraulic oil is of paramount importance to long-term reliable functionality of the system. Cleanness must conform to ISO 4406 Class: 16/14/11. For this reason, the oil supplied is continuously filtered; in addition a primary filtration unit is provided in the condition loop.
Hydraulic oil must be replaced every two or three years to ensure that its lubricant additive content remains at the correct level. Fresh oil must be added via filler valve when the hydraulic system is not in operation. Because fresh oil normally does not conform to the specified purity requirements, it must be circulated in the condition loop for at least four hours after it has been added to the system. Valves must be closed during this phase.
-Oil Storage Tank
Oil storage tank is constructed of steel and equipped with measuring instruments. A level monitor is provided for remote display of the tank oil level. Thermometer and duplex resistance temperature sensor permit local and remote display of the temperature of hydraulic oil in the tank. For indoor locations heating up the oil by means of pumping is sufficient to keep an optimum temperature. This tank is equipped with a venting filter that minimizes the ingress of contaminants into the hydraulic oil tank.
- Hydraulic Oil Pumps
Two pressure-controlled axial piston pumps, which are driven by AC motors, are mounted on top of the hydraulic oil tank. Each of these pumps is capable of meeting the entire system demand on its own. Normally one pump is running and the other on standby. A selector switch allows the operator to specify which of these pumps is used. Adjustable pressure limiting valves control the proportional pumps such that the displacement of the pump that is running is automatically varied in line with system requirements. These valves ensure that the supply pressure is held constant at 160bar. If pressure transducer detects a decline in pump discharge pressure, the standby pump
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