The primary function of the lubrication system is to supply the various journal and thrust bearings with an adequate supply of a suitable lubricant for the formatiom. Approval issue course 234 turbine and auxiliaries module 10 stressed that these consequences. Steam turbine lube oil and control oil system viscosity. In order to ensure that the highpressure lubricant is properly supplied to the. Turbine lube oil system monitoring and control using pic. The system assists in dissipating or settling contaminants, providing for temperature fluctuations and storing oil. Heat thus transmitted is carried away by lube oil, thereby maintaining bearing temperature at a safe level. Tests for varnish predictiongas and steam turbines gas turbine trips or nostarts caused by varnish in system hydraulics have created a demand for inservice lubricant varnish testing. Keep your oil clean maintaining turbine oil cleanliness is important for maximizing equipment and lubricant life.
The only method of protection is to provide a sufficient number of alternate power supply lube oil pumps to insure all lube oil flow is not lost. Transfer barrier accumulators can slim down your lube oil skid and protect the environment by joe cheema lube oil systems provide lubrication and cooling to gas turbines and other industrial equipment. In practice, however, cleaning these systems rarely gets the attention deserved. Lubrication system flushing may be either a displacement flush after a drain and fill, or a high velocity flush for initial turbine oil fills.
This guide is intended to aid the equipment manufacturer, installer, and turbine operator in coordinating their efforts to obtain and maintain clean lubrication and control systems. Gear type pump with separated sections for lube and control oil peripheral speed measured at the outside diameter of the pump gear pinions must not exceed 1011 ms. A gas or steam turbine utilizes two types of hydraulic systems. Along with providing lubrication to the shaft bearings, the lubricant also lubricates the oil pump, and in some systems is used as a turbine control fluid in the hydraulic governing system.
This is a short description about steam turbine generator lube oil system. Steam turbines startups 171 prior to switching on the turning gear, oil system is started up. Depending on the type of installation, this also may include the hydraulic control system, oil. The main purpose of this section is to give all operation personnel a basic understanding of. Steam turbine control valve, governing and lube oil system. A steam turbine package is made up of several components systems including the following. The faults of lube oil system would affect the performance of the whole gas turbine unit, and even lead. Lubricant analysis in steam turbines machinery lubrication.
Chief among the various mechanisms inside a turbine system that can result in degradation of the oil while in service are oxidation and thermal degradation. Pdf simulation of speed steam turbine control system. A lubricant analysis program was applied quarterly, taking two samples from the oil reservoir and sending it. Maintenance and overhaul of steam turbines wgp42 05. Laboratory tests for steam and gas turbine oils mobil. Steam turbine oil challenges lubrication engineers. The ability of the oil to separate from water is especially important in systems where signi. Bottoming cycle the steam turbine, hrsg, condensate, feed water and associated systems. The lube oil system of turbine consists of four pumps auxilary oil pump known as aop, emergency oil pump known as eop, jacking oil pump known as jop and main oil pump known as mop.
Particular problems of steam turbine lubrication 127 figure 3. Astm d2272 standard test method for oxidation stability of steam turbine oils by rotating pressure vessel astm d4378 in service monitoring of mineral turbine oils for steam and gas turbines developing balanced turbine oils. Since the shaft of the turbine are rotating in high speed the environment will be. Gas or steam turbines with a combined or separate lube and control oil system. Cleaning seal and lube oil systems is also often required during a machinery turnaround. The fluid system package can mount separately from the steam turbine generator or be installed integrally with the turbine base. The three areas covered in this guide are the main steam turbine, the steam seal system, and the lube oil system. Acces pdf diagram lubrication system for a diesel engine a chance to film. The auxiliary lube oil pump is normally backed up with a class i dc emergency lube oil pump. Lube oil system is very important to ensure the normal and stable operation of gas turbine. When the turbine is running at a normal speed of 3000rpm, then the desired quantity of oil to the governing systems and the lubrication systems is supplied by this pump. Control of lube oil pressure and temperature, as well as rotor axial displacement and eccentricity is necessary. For both systems the oil is taken from the main oil.
The dry gas may be air such as dehydrated instrument air, or. These systems can be utilized on reservoirs on steam turbines, combustion gas turbines, and hydroelectric turbines. An attempt is made to present difficulties and their successful solutions based on actual operating experience. This usually means protecting the steam turbine from overspeeds, water induction, loss of lube oil, corrosive steam, and sticking valves that could cause major damage to the turbine, and conducting internal inspections of the turbine. Lube and seal oil systems, and steam and process gas piping require a thorough cleaning before. Turbine lube oil system flushing and initial filtration should be addressed in conjunction with the selection of the turbine oil. Pressurized lube oil systems are integral to the reliable. Lube and seal oil systems, and steam and process gas piping require a thorough cleaning before a new machinery train can be commissioned. General industrial steam turbine prefers a steam source of 42 kgcm2 600 psi at 482 oc 900 o f. Control and oil system lubrication system the oil supplied to the lubrication system as noted above passes through the oil cooler and thence to the main bearings, thrust bearings and turning gear. For the purpose of this course, the name turbine lubricating oil system has. They differ in the physical sizes pressure and flow.
The lubricant oil will form a protective film coating around the shaft only if it is sprayed at a pressure of 1. The main design code or standard shall be stated on the relevant data sheets. Oil problems are estimated to be the cause of nearly onefifth of all forced turbine outages, according to a comprehensive guide to industrial turbine lubricants, by afton chemical corp. There are many considerations to be taken when choosing a controller. Most often lube oil fire occur as the result of other turbine damage. Turbine lube analysis programs oil analysis, oil sample. To provide turbine generator lubricating oil and autostop oil for the turbine trip system, and 4. When a gland seal is leaking steam, the humidity of the sunounding air is increased.
How engine cooling system works this video demonstrate how an internal. The fls package includes a hydraulically separate lubrication and lubricating oil dehydration system, a hydraulic fluid supply and conditioning system and common control console in a single. During start up and shut down periods, the steam turbine lube oil is supplied by the auxiliary pump and when the turbine is at rated speed the main oil pump supplies the oil. Steam turbine control systems are being designed with todays technology to operate a turbine in a safe and reliable manner. Figure 1 is a simple illustration of the general components and travel route of turbine oil in a steam turbine lubrication system. How is the lube oil system of steam turbine designed in. The appearance under the microscope of various forms of contaminants. It is always necessary to check whether lube oil pumps has started and whether all bearings are supplied with oil. We also provide accessory skids for water wash, fire suppression, denox and water injection.
Steam turbine lube oil system is usually required to provide oil for tripandthrottle valve, governor system, power cylinder or similar accessories combined pressure lubrication and control oil unit. In turbomachinery, they are important for hydrodynamic bearing performance. The major concern caused by too high pressure oflubricating orjack ing oil is that it,increases the risk of system overpressure failure if the reliefvalves failed to operate. A steam turbogenerator at a cellulose industry plant turbine oil analysis. Steam turbine lube oil system is usually required to provide oil for tripandthrottle valve, governor system, power cylinder or similar accessories. Wcecs 2010, october 2022, 2010, san francisco, usa oil. Tutorial on troubleshooting bearing and lube oil system problems 149 figure 2. This steam turbine oil system is a low pressure oil supply system mainly composed of main oil pump, is generally used to provide lubrication oil to all bearing shafts of steam turbine generator and provide pressure oil to conditioning and protection system it generally includes main oil pump, grease injector, assistant oil pump ac and dc lube. To provide dry, superheated steam to the low pressure turbines to reduce moisture erosion and to increase plant efficiency. The modern large type steam turbine may have thousands of gallons of lubricating oil in its circulation system but the role of this lubricant may well be onetenth.
Water and particulate contamination in steam turbine lube oil reservoir location. How to select and service turbine oils lubrication. Water contamination of steam turbine lube oilshow to avoid it 53 in the writers opinion, the best way of coping with this problem is to install a dry gas purge at the bearing housing seals. Auxiliary oil pump an overview sciencedirect topics. Steam turbine lubricants must readily shed the water. Nevertheless, a close monitoring of the oil condition was ensured by analyzing the turbine oil periodically. A fixed orifice bypassed with a valve giving a variable orifice effect, is. Pumps, compressors, gas turbines, reciprocating combustion engines, transmissions, expanders, steam turbines, lubrication and seal oil systems, baseplates, centrifuges, cyclones, pressure retaining equipment incl. One stage vertical centrifugal pump driven by an a. Emergency lube oil pump this cuts in if the turbine. Steam turbine lube oil system protections using scada.
A steam turbine oil s most important functions are to. As steam turbine lube oil fires are the highest probability fire event, and the damage is always severe, it is essential that plant owneroperators have proper protective systems, procedures, training, and plans in place to mitigate this risk. Depending on the size and type of the steam turbine and also on their age the lubrication systems of steam turbines vary widely and may fall into either one or a combination of a ring oiling and circulating pressure or gravity system. Jet engine lube system a look at the components of a typical jet engine lube system, and a. Auxiliary oil pump can meet the requirements of lubrication system under emergency conditions. The lubricating oil system has three separate pumps which supply the bearings and hydraulic system with oil.
Many steam turbines have an isolated governing system that contains its own fluid. Particular problems of steam turbine lubrication by. Steam turbine lube oil and control oil system free download as powerpoint presentation. Much of the worlds energy is produced by turbines that depend on this type of lubrication system. Gear type oil pump driven off the turbine main shaft. Forced lubrication steam turbines, single stage steam. Apart from that barring arrangement is giving between lp and ip tu. Lubrication, seal and piping systems for turbomachinery. Schofield ge company schenectady, ny introduction the need to provide stateoftheart products for a diverse and everchanging market is the chal lenge facing steam turbinegenerator manufactur ers in the 90s.
36 1456 111 295 1216 1523 1009 871 118 209 126 624 932 1110 650 1113 779 1546 501 1546 1514 1397 1316 1067 509 148 567 882 1099 1437