Comprehensive practical knowledge of hydraulic systems to 15,000 psi operating pressure including: pressure testing and recording, hydraulic flushing and cleanliness testing, instrument tube and pipe fitting, systems operation, troubleshooting, fault finding and repair to component level (including pumps accumulators, regulators, relief valves, directional control valves, pressure switches and transmitters), and testing etc. Sound mechanical knowledge including threads and thread forms, limits and fits, measuring units and conversions, basic math and mechanics, and properties of materials.