TCA Project Guide - Document - MAN Diesel & Turbo

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4 MAN Diesel & Turbo TCA Project Guide TCA Project Guide TCA Lube oil pressure The required lube oil pressure of the turbocharger is adjusted with a pressure reducing valve or an orifice. The oil pressure is checked via a measuring connection positioned in the lube oil feed downstream of the pressure reducing valve and the non-return valve. The lube oil pressure must be selected so that a pressure of 1.2 – 2.2 bar is present at this point at full engine load and with the lube oil at service temperature. The following parameters apply for the monitoring of the lube oil pressure: ▪ The alarm value is to be set for a drop in the lube oil pressure to 1.0 – 1.2 bar. ▪ The limit value for load reduction to half load is 0.8 – 1.0 bar. ▪ At
2011-03-24 - de MAN Diesel & Turbo 4 Indication of the pending alarm and the reaction of the engine control system must occur at the same time. Therefore, the engine control system must conform at least to category 3 in compliance with ISO 13849-1. Pre-Lubrication, Emergency Lubrication and Post-Lubrication of the Turbocharger Pre-Lubrication Before the engine is started, the turbocharger must be pre-lubricated. This is automatically done together with the pre-lubrication of the engine because the lube oil system of the turbocharger is generally connected to that of the engine. Depending on the engine system, pre-lubrication occurs directly before engine start-up or by means of continuous pre-lubrication. Pre-lubrication before start-up: ▪ Max. 10 – 30 minutes with 0.2 – 2.2 bar (6.0) 1) 1) Over 2.2 bar with orifice adapted to the engine pressure. Pressure measurement downstream of orifice for alarm, slow down and shut down (see Chapter [4] - Lube Oil System). Emergency Lubrication The worst-case scenario for the turbocharger bearings is a direct engine shut-down from full load, which can occur in the event of a power failure. In this phase, the turbocharger bearings can easily overheat due to a lack of lube oil. To prevent this, the following minimum requirements must be met. For emergency lubrication, the turbocharger requires an oil pressure in excess of 0.05 bar (reference point: turbocharger centreline) if, in an emergency situation, the engine initially continues to run at full power following failure of the main lube oil supply (see Figure Emergency lubrication diagram). NOTE For differences in height between the pressure measuring point and the centre of the turbocharger, a value of 0.1 bar per metre must be taken into consideration. If the main lube oil pump is not driven by the crankshaft of the engine, the engine must be shut down no more than 10 seconds after a power failure. These 10 seconds must be bridged using a separate lube oil tank or an emergency pump (powered by battery or compressed air). The optional gravitation tank can meet this requirement. The lube oil pressure during emergency lubrication must be above the limit value of 0.05 bar (reference point: turbocharger centreline) until the turbocharger speed has fallen to 20% of the maximum permissible speed indicated on the type plate. Please note that the axial bearing of the turbocharger acts like a pump. For this reason, the turbocharger must be supplied with sufficient lube oil. After this time, the lube oil pressure may fall below this value. The remaining oil in the bearing casing is sufficient to protect the bearings against damage or increased wear until the rotor has come to a standstill. TCA Project Guide TCA Project Guide TCA TCA 4-01 EN 5 (9)
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TCA Project Guide - Document - MAN Diesel & Turbo

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