Lube oil system

Monitoring should include the usual parameters worthy of surveillance in high-speed turbo machinery the temperature of journal bearings, vibration and axial position of the pinions, inlet and discharge temperatures combined with discharge pressure from the individual compressor stages, and various lube oil system devices. Competent manufacturers make sure all measurement locations are completely prewired on the machine and made available at predefined interfaces or in terminal boxes for connection at the plant site. 

Lube oil level in the reservoir should be monitored by a sensing deviee to indieate low lube oil level. Loeal and panel-mounted pressure gauges are neeessary to monitor operation of the lube oil system and must be ineluded in the manufaeturer s seope of supply. The purehaser must distinguish between eontrol room instrumentation and instruments mounted on a stand-alone (loeal) panel. There is also a tendeney to plaee monitoring instruments on auxiliary equipment and piping. While this may eost less, it often eomplieates tlie operator s surveillanee tasks. 

An important eomponent in the lube oil system is the aeeumulator. It must be periodieally eheeked for proper eharge and bladder or diaphragm integrity. This ean be done at any time. With bladder-type aeeumulators, elose aeeumulator bloek valve, open drain valves, and observe the eharge pressure. If there is no pressure, eharge the bladder to the speeified pressure. If pressure cannot be maintained, the bladder is defective and must be changed. 

Figure 8-2. Block diagram of a pressurized lube oil system.

A dry sump design should be employed. The gear unit for a train with a central lube oil system should be designed for the turbine grade oils of the system. Typically, 150 Saybolt Seconds Universal (SSU) oils at 100°F (ISO 32) with an inlet temperature of 110°F to 120°F are adequate. 

Ancillary systems, such as lube oil systems and couplings... 

Lube oil system from pump discharge to the distribution system should be flushed with lube oil at 160 F-180°F. Oil should flow across a 200 mesh screen and flushing should cease when no more dirt or grit is found on the screen. 

Packing/cylinder lubrication can be provided from a forced feed compressor lube oil system. For very cold installations, immersion heaters and special lube oils must be considered. If the lube oil temperature gets too cold, the oil becomes too viscous and does not flow and lubricate properly. 

Oil is supplied to this system from the frame lube oil system or from an overhead tank. This oil comes in contact with and thus contaminates the gas being compressed. Gas/oil compatibility should be checked. 

In this cycle, approximately 30% of the fuel consumed is available as power output. In addition, approximately 30% is used to drive the air compressors, 30% is contained in the hot exhaust gases, and 10%> is lost to radiation and the lube oil system. 

The final element of the equipment description is the equipment boundary figure. A boundary figure is included with each data cell to define the components and limits of the equipment associated with that cell. For example, the data cell boundary figure (Data cell 3.3.7.2.1.1) in Figure 3.2 shows that the centrifugal pump, seal system, motor, motor control unit, lube oil system, coupling, and transmission are all components of the equipment in the data cell. The equipment boundary is inherently reflected in the taxonomy number. 

Controls. Request diagram of shutdown and alarm for over- or under-pressure, over-speed, high bearing temperature, lube oil system. 

Lube oil system arrangement drawing including size, rating, and location of all customer connections. ... 

Compressors, together with related lube-oil systems. 

When operational characteristics of the oil systems were examined in detail, it was found that the oil supply came from the main turbine lube oil system. The operators said that after a start in cold weather they had trouble maintaining anything but the minimum lube oil temperature of 120°F (49°C) until the turbine was at power. The feed pump hydraulic coupling specifications indicated that a minimum temperature of 140-160°F... 

Figure B.10 — Lube-oil system schematicLube-oil system schematic...

Eventually, the fouling deposits on the rotor will become so thick that they start to break off, especially if you shut the compressor down for a few hours for minor repairs to the lube-oil system. When the compressor is put back on line, bits and pieces of grayish salt break off, and unbalance the rotor. At 8000 rpm, the high-vibration trip cuts off the fuel to the gas turbine, and the machine is taken off line for repair. 

Cooling water failure. The loss of cooling water is one of the more commonly encountered causes of overpressurization. Two examples of the critical consequences of this event are the loss of condensing duty in column overhead systems and the loss of cooling for compressor seals and lube oil systems. Different scenarios should be considered for this event, depending on whether the failure affects a single piece of equipment (or process unit) or is plantwide. 

Information regarding troubleshooting lube oil systems is provided in procedure 01-GEN-34. 

Lube oil system designed for Seismic Category I requirements. 

Wet-rotor reactor coolant pumps to eliminate the systems and maintenance associated with pump seals and lube oil systems. 

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