Auxiliary Components

1. Auxiliary Components BAE 515 � Lecture 15

2. Auxiliary Components Electrical Controls Filters and Strainers Fittings Heat Exchangers Hydraulic Fluids Instrumentation Manifolds Lines Reservoirs

3. Auxiliary Components Reservoirs � Well designed reservoirs store fluid, trap contaminants, separate entrained air, and cools fluid Three classes: Integral � Wasted space within machines is converted to reservoir Remote � Used in stationary or industrial applications where space is not a concern Rectangular � Used as a base to support motor and pump, or other components.

4. Auxiliary Components Design Criteria: Volume � Capacity is typically between and two and three times the pump output capacity for 1 minute, reservoir must have capacity to accept flow from retracted cylinders, and to fill extended cylinders. Lines � Return line and pump inlets should be submerged, pump supply should be 1.5 diameters from bottom of reservoir to avoid ingestion of contaminants resting on the bottom of the tank, tank should de-aerate fluid by providing enough separation time in the reservoir, screens may be added (No. 100 mesh on a 300 to 450 angle) to remove entrained air Baffles � Pump inlet should be separated from return lines to prevent continuous circulation of the same fluid, two baffles provide 1.5 times flow path of single baffles. Cleaning � provisions should be provided to clean reservoirs.

5. Auxiliary Components Design Criteria: Draining � Provisions should be provided for easily draining reservoirs. Level Indicator � Site gauges should be provided for visual monitoring of fluid levels. Sealing � cast reservoir components should be sealed to prevent contamination of fluids Filters/Breathers � As fluid levels rise and fall in the reservoir provisions should be made to filter potential contaminants from entering air. Pressurizing � Reservoirs may be pressurized to provide a flooded pump inlet to avoid cavitation, a relief should be added to prevent over-pressurization

6. Auxiliary Components Design Criteria: Filters Access � Pump inlet filters should be serviced without drain reservoir or �diving� external filters can be serviced easily. Plugs/Separators � Magnetic plugs and separators can be used to reduce ferrous contaminants, plugs should be placed in locations where fluid velocities are low. Filler � Filler opening should be located in an easy to reach location, opening should be fitted with a screen to reduce contamination. Scavenger systems � If overhead tanks are used, pumps must be provided to return drainage fluid to main reservoir.

7. Auxiliary Components