Wrtsil Land & Sea AcademyPage1Chapter 202-Dec-08 RT-flex Comp. & Systems RT-flex Training Mech. Components & Hydraulic systems (RT-flex Specific Parts only) Chapter 20 Wrtsil Land & Sea AcademyPage2Chapter 202-Dec-08 RT-flex Comp. & SystemsRT-flex specific parts only Wrtsil Land & Sea AcademyPage3Chapter 202-Dec-08 RT-flex Comp. & SystemsOverview, RT-flex50 (Size 0) WECS-9520, E 95 Cylinder Electronic Unit Terminal boxes Supply unit Rail Unit(s) Automatic filter WECS-9520, E 90 Shipyard Interface Box (SIB) on the free end Wrtsil Land & Sea AcademyPage4Chapter 202-Dec-08 RT-flex Comp. & SystemsOverview, RT-flex58/60C (Size 1) WECS-9520, E 95 Cylinder Electronic Unit Terminal boxes Supply unit Rail Unit(s) Automatic filter WECS-9520, E 90 Shipyard Interface Box (SIB) on the free end Wrtsil Land & Sea AcademyPage5Chapter 202-Dec-08 RT-flex Comp. & SystemsOverview, RT-flex82C/82T (Size 3) WECS-9520, E 95 Cylinder Electronic Unit Terminal boxes Supply unit Rail Unit(s) Automatic filter WECS-9520, E 90 Shipyard Interface Box (SIB) on the free end Wrtsil Land & Sea AcademyPage6Chapter 202-Dec-08 RT-flex Comp. & SystemsOverview, RT-flex84 and 96 (Size 4) WECS-9520, E95 Cylinder Electronic Unit Terminal boxes Supply unit Rail Unit(s) Control oil Pumps Automatic filter WECS-9520, E90 Shipyard Interface Box (SIB) or at the free end (smaller engines) Wrtsil Land & Sea AcademyPage7Chapter 202-Dec-08 RT-flex Comp. & SystemsAutomatic Filter For the servo- and control oil systems normal system oil is used instead of a separate hydraulic system for simplified installation. One branch of the main lube oil pipe is connected to the automatic filter. The automatic filter has cartridges of nominal 6 m where the by-pass filter has a mesh size of 36 ?m. The filter “sludge“ goes back to the crankcase. Wrtsil Land & Sea AcademyPage8Chapter 202-Dec-08 RT-flex Comp. & SystemsAutomatic Filter The back flushing is automatically initiated by the control box either A) standard: Time controlled (after 1 hour) B) or: if the differential pressure across the filter becomes too high (0.35 bar) The filter “sludge“ goes back to the crankcase. It is filtered system oil which is clean enough for normal use. In the filter control box the back flushing is initiated either by time or differential pressure. Flushing cycles are counted. Failure messages are generated if necessary (Overcurrent, differential pressure high etc) There are switches/buttons to switch from “Operation” to “Adjust”. For detailed information please consult filter makers manuals. Wrtsil Land & Sea AcademyPage9Chapter 202-Dec-08 RT-flex Comp. & SystemsSupply Unit Drive, Size 0 Single lobe drive The supply unit is direct driven by the crankshaft. The servo oil pumps are driven by individual pinions, having a mechanical fuse“ (reduced diameter in pinion), in order to protect the gear-drive in case of a pump seizure. Since the supply unit, i.e. fuel pumps and servo oil pumps have no timing, means they just supply fuel or oil, the camshaft does not have to have a determined position compared to crankshaft. However the position of the cams relative to each other must be respected. Wrtsil Land & Sea AcademyPage10Chapter 202-Dec-08 RT-flex Comp. & SystemsSupply Unit Drive, Size 1 RT-flex58T-BRT-flex60C Wrtsil Land & Sea AcademyPage11Chapter 202-Dec-08 RT-flex Comp. & SystemsSupply Unit Drive, Size 2 Wrtsil Land & Sea AcademyPage12Chapter 202-Dec-08 RT-flex Comp. & SystemsSupply Unit Drive, Size 3 Wrtsil Land & Sea AcademyPage13Chapter 202-Dec-08 RT-flex Comp. & Systems The supply unit is driven by the crankshaft, via two intermediate gearwheels. 3-lobe cams are mounted to the camshaft. The servo oil pumps are driven by individual pinions, having a mechanical fuse“ (reduced diameter in pinion), in order to protect the gear- drive in case of a pump seizure. The servo oil pump gearwheel is hydraulically fitted as well. Since the supply unit, i.e. fuel pumps and servo oil pumps have no timing, means they just supply fuel or oil, the camshaft does not have to have a determined position compared to crankshaft. However the position of the cams relative to each other must be respected. 3-lobe cams Supply unit gearwheel Servo oil pump drive gearwheel and pinions 2ndintermediate gearwheel Camshaft bearing covers Supply Unit Drive Drawn for Size 4 Wrtsil Land & Sea AcademyPage14Chapter 202-Dec-08 RT-flex Comp. & SystemsSupply Unit, Size 0 Fuel side: The jerk-type“ fuel oil pumps deliver fuel to the fuel rail. To keep the rail pressure (600 - 900 bar), the pump flow rate is regulated via electric actuators, by pressure set point signals from WECS- 9520. Servo oil side: The Dynex servo oil pumps deliver oil to the servo oil rail with a pressure of 100 - 200 bar via rising pipes. The number of fuel- and servo oil pumps depends on the number of cylinders. Servo oil Pumps Fuel Pumps El. Actuators Wrtsil Land & Sea AcademyPage15Chapter 20