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System preparation
Before flushing, it is necessary to make certain preparations to minimize damage to sensitive components and ensure that the flushing process achieves a certain effect. These preparations may vary slightly depending on the steps used and the system design. A dedicated flushing table can be used, or some modifications can be made to the existing system for flushing. In the following explanation, it is assumed that the latter method is used. The flushing of the internal surfaces of pipelines and equipment is carried out when the flushing oil is in a turbulent state. This can be achieved when the flow rate is greater than 0.1413dv (liters/minute), where d is the inner diameter (mm) and v is the viscosity of the flushing oil at the flushing temperature (centistokes). Gently tapping the pipeline before and during flushing can also help loosen dirt and rust.
If the capacity of the main oil pump is not sufficient to generate the required flow, an external auxiliary pump may need to be used.
All components that may be damaged by high flow rates, such as throttle valves, gears, motors, oil cylinders, and relays, should be isolated or removed from the system, and replaced with plugs or bypasses where necessary.
A filter of approximately 100 mesh should be temporarily installed on the suction side of the pump, and an auxiliary or bypass paper filter can also be used to increase filtration speed and control particle size. Filters should be avoided from being used under turbulent conditions. If necessary, the filtering equipment can be left in place and the filter removed.
Installing a vent at the high point of the system (if not previously installed) can ensure that the system is fully charged. Install discharge points at all low points of the system.
It may be necessary to divide the system into several sections or circuits and flush them separately. In this case, each section should have an appropriate flushing interface, and each section should be flushed in an accurate order.
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