If the turbine does not have a labyrinth seal at the housing end, while the turbine is in the shop, the housing end may be bored. A hydrogen cooled generator having a system for diagnosing problems associated with a seal oil system. Pipe plugs were installed in place of the spindles. Centrifugal compressor wet seals seal oil degassing and control. The fluid is used for main reduction gear lubrication on all steam and gas turbine powered ships, and in some hydraulic systems. The lube oil system feeds the jacking oil pump from downstream of the lube oil filter. Keep in mind that oilsupply pressure should not be. This will cause sluggish operation and, in extreme cases, disasters due to slow operation of the governing valve.
In many thermal power plants the seal oil system is combined with the lubrication oil system of the turbine. This pump is an axial piston type, which is located on the lube oil tank. The lubrication oil pump provides oil to the seal plates. Oil is not used for sealing purpose in a turbine bearing.
A pressure limiting valve maintains the pressure in the jacking oil system in accordance with the operating data. The fluid being pumped is turbinereduction gear lubricating oil mill17331, 1992, commonly called 2190 tep. In figure 1 the main oil pump is shown on the left, while one governing oil impeller. Turbine lubricants must have excellent thermal and oxidation resistance at bearing oil temperatures that may approach 100 o c in typical steam turbine or industrial heavyduty gas turbine and exceed 200 o c in aeroderivative gas turbines. Turbine lubricants must control the rust and corrosion that could destroy precision surfaces, resist foaming and air entrainment, which could impair lubrication. Nov 15, 1977 in accordance with the present invention, a seal oil system is provided for supplying seal oil to the seal plates of a gastight turbine generator both for normal operation and backup operation. Api 614 indicates an iso 32 turbine oil as the lubrication fluid. Alternative solution seal oil gas separation and recoveryuse simple process of separating seal oil and entrained gas with the gas routed to recovery andor use.
Centrifugal compressor wet seals seal oil degassing and. Thus, a liquid fuel system is frequently a part of the installation. The differential pressure p across the oil seal is the difference between the pressurized air entering the dry. It represents the normal oil consumption of the engine 0. This paper will consider the stateoftheart of two general types of seals in a gas turbine. Function and system layout the two functions of the turbine glands and seals are.
Wet seal degassing recovery system for centrifugal. What is the purpose of a seal oil system on a steam turbine. Lubrication systems are used to remove heat generated in the bearing due to friction while seal systems are used to create a barrier between the. Jun 01, 2011 turbine lubricants must have excellent thermal and oxidation resistance at bearing oil temperatures that may approach 100oc in typical steam turbine or industrial heavyduty gas turbine and exceed 200oc in aeroderivative gas turbines. Act as catalysts that increase the rate of oil oxidation. Since the shaft of the turbine are rotating in high speed the. Re220gv and gx turbine oil tube leaks issue turbine oil pressure and scavenge tubes leaking. How does the steam turbine gland sealing system work.
It drains into the bearing pedestal and flows back to the lube oil. Pump or approved equal, with above ground discharge and furnished with suitable driver and accessories to meet the requirements herein or as shown on the drawings. Turbine lubricants must control the rust and corrosion that could destroy precision surfaces, resist foaming and air entrainment, which could impair. Generator seal oil supply system westinghouse electric. Since the shaft of the turbine are rotating in high speed the environment will be high in temperature. Remove the snap ring, and then you can see the chra and compressor housing. A differential pressure between the seal oil and hydrogen gas must be maintained in order to avoid hydrogen leakage. Fm globals generator mockup, simulates oil spray, pool, and pressurized 3dimensional fires typical components of a turbine lube oil fire scenario.
Blade droop and seal reliability due to manufacturing tolerances and running clearances of machined. Steam turbinegenerator overhaul and inspection guidelines. Much of the worlds energy is produced by turbines that depend on this type of lubrication system to keep them. Much of the worlds energy is produced by turbines that depend on. Gearbox typical failure modes, detection and mitigation methods.
Auxiliary oil pump can meet the requirements of lubrication system under emergency conditions. Combined lube and seal one reservoir one turbine driven main oil pump mop and one motor driven auxiliary oil pump aop duplex coolers and filters. A lube oil system will be required unless, of course, the turboexpander is supplied with active magnetic bearings. Gearbox typical failure modes, detection and mitigation. A steam defector is a metal disc attached to the shaft and located between the carbon box and the seal.
If the turbine does not have a labyrinth seal at the housing end. In accordance with the present invention, a seal oil system is provided for supplying seal oil to the seal plates of a gastight turbine generator both for normal operation and backup operation. Dec 09, 2015 since the hydrogen seal oil system has parallel cartridge filters located downstream of the cuno filter, the cuno filter was returned to service without internal components. Eng, plant engineer, turbine plant engineer, eskom. Flownex allowed the engineers to an improved understanding of their develop systems and to identify the main contributing factors to these failures, thus preventing numerous future outages due to seal oil repairs, which in turn led to a.
Nov 19, 2016 function of gland steaming in turbine operation. We routinely deliver packaged systems such as gas turbine fuel forwarding manifold assemblies, integrated lube and seal oil systems, dry gas seal and buffer gas seal packages, and steam turbine generator sets. Linkediesinger 2010 an air oil separator also called a deaerator figure 9 is a component in a gas turbine lubrication system in which air is removed from scavenged oil before its return to the oil tank. The conventional lube oil system consists of a reservoir, electric cartridge or steam coil heater, lube oil pumps, one and preferably two switchable lube oil coolers. Vented h2 to allow for securing h2 seal oil system 59 58. Recovery system that separates gas from the exiting seal oil before routing to the degassing tank recovered gas sent to various outlets. Lubrication, seal and piping systems for turbomachinery.
To provide dry, superheated steam to the low pressure turbines to reduce moisture erosion and to increase plant efficiency. Centrifugal compressor wet seals high pressure seal oil circulates between rings around the compressor shaft oil absorbs the gas on the inboard side little gas leaks through the oil seal seal oil degassing typically vents methane to the atmosphere seal oil degassing may vent 40 to 200 scfminute. Wet seal degassing recovery system for centrifugal compressors 2014 2 one partner has reduced methane emissions from centrifugal compressor seal oil degassing by separating gas from seal oil in a small separatordisengagement vessel and routing it back into the compressor suction, to high pressure turbine fuel gas, or to low pressure fuel. Hydrosele total sealing systems for water turbine shafts. 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. Contaminated oil in the lubricating system of an engine can be disastrous to engine operation. Product application bulletin under turbine lube oil. Innovative rotary sealing cartridge systems that offer. Many industrial machines are delivered suitable to burn either gaseous fuel or liquid fuels. Elliott first began to manufacture oil consoles for its own turbomachinery nearly 80 years ago. A common ac motor drives both the jacking oil and turning gear pump.
Vibration data helps to identify a steam turbine seal rub. Alternative solution sealoilgas separation and recoveryuse simple process of separating sealoil and entrained gas with the gas routed to recovery andor use. The jacking oil pump supplies the jacking oil system. The seal oil system prevents gas from leaking out of the compressor case. Oct 21, 2017 in this video we demonstrate turbine lube oil system design,steam turbine lube oil system diagram, turbine lube oil system,steam turbine lube oil system,steam turbine lube oil system diagram,steam. Improving the reliability of turbine lube oil supply. Wet seal degassing recovery system for centrifugal compressors. The oil that flows across the outboard ring mixes with the bearing lube oil and returns to a lube oil tank. The lubricant oil will form a protective film coating around the shaft only if it is sprayed at a pressure of 1. Five years ago, san onofre nuclear generating stations unit 3 turbine experienced substantial damage after the supply of oil to its bearings failed. Included is a shaft having a turbine end and a collector end. The oil that flows across the outboard ring mixes with the. It is important to avoid oil leaks due to too low p through the oil seals.
To provide turbine generator lubricating oil and autostop oil for the turbine trip system, and 4. These systems require auxiliary equipment such as pumps, regulators, filters, and so on for proper operation. Seal oil system in large turbo generator sets hydrogen cooling system is introduced for effective cooling of the machine now the problem is to maintain the hydrogen gas parameters inside the generator casing at all regimes hydrogen seals are provided on both the sides to overcome this problem seal oil system basically the function of hydrogen seal oil system is to prevent. Get entrained into the small clearances of the governing system. The most common fuels for these machines are natural gas and distillate fuel oil. Bloch, claire soares, in turboexpanders and process applications, 2001. Linkediesinger 2010 an airoil separator also called a deaerator figure 9 is a component in a gas turbine lubrication system in which air is removed from scavenged oil before its return to the oil tank. The installation of a dry gas purge into a bearing housing seal usually requires some planning, but is not particularly difficult. Seal oil system of generator in thermal power plant pump. Us20110231111a1 turbinegenerator hydrogen seal oil. Engineers modelled the hydrogen seal systems and used the simulated results to identify the case of their system trips.
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. National renewable energy laboratory national wind technology center. Operation of seal oil system the seal oil is kept at a higher pressure than the gas pressure in the generator by specified differential 0. We fabricate piping assemblies and spool pieces in our iso 9001 certified, stateoftheart facility in belle vernon, pennsylvania, usa. O148 milprf7808 three centistoke turbine engine synthetic lubricating oil. Since the hydrogen seal oil system has parallel cartridge filters located downstream of the cuno filter, the cuno filter was returned to service without internal components. Failure mode location different than previous service bulletin corrective action can cause high oil consumption hoc andor low oil pressure lop impacting all re220 apu installations action improved tube design status. We also provide accessory skids for water wash, fire suppression, denox and water injection. O156 milprf23699 five centistoke turbine engine and gearbox oil. Approval issue course 234 turbine and auxiliaries module 10 stressed that these consequences. Gas turbines are normally supplied with a lube oil package mounted in the bedplate of the turbine. Three oil impellers or pumps are mounted on the turbine shaft. It is coupled to the turbine rotor through a gear coupling.
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