A steam turbine gland seal control system for a steam turbine driving an electrical generator which supplies power to a load after main circuit breakers are closed, and in which the gland is selfsealing by steam in the turbine after said closing, comprising. Under certain conditions the gland is sealed by an auxiliary steam supply, and under other conditions the gland is self sealed by turbine inlet steam. How to improve steam turbine head rate and increase output. The bushing seal is a sleeve that forms a small clearance about a. Likewise during the coldest winter months, where electric heat is the main source of residential home heating, peaking power is often required from simple cycle. A discussion of turbine and compressor sealing devices and. For understanding the gland sealing system first we have to understand why it is required so there are two main reason. Shaft sealing in high output turbines is done with. Trelleborg sealing solutions offers an outstandingly comprehensive sealing portfolio a onestopshop providing the best in elastomer, thermoplastic, ptfe and composite technologies. Steam turbine advanced sealing system mda turbines. Wet seal degassing recovery system for centrifugal compressors 2014 3 routed to a seal oil demister to remove entrained seal oil before routing to beneficial use. Us3574478a sealing system for turbine and compressor. Typical gland box outfitted with conventional carbon rings carbon rings have two sealing surfaces. A steam turbine gland seal control system for a steam turbine driving.
We manufacture wide range of products such as turbine babbited bearings, turbine babbited thrust pads and turbine valve stem. The leakage steam from glands are taken to gland steam condenser thru piping and returned to condensate system. In order to accommodate the range of temperatures experienced throughout the turbine, the system is usually divided into two parts. The roxtec sealing system withstands tough conditions and high temperature environments. A control system is provided to modify the temperature of the auxiliary steam to be more compatible with the self. Steam turbine gland seal control system westinghouse electric corp. In fact, operating experience reveals that sealing practice has a significant impact in three areas. Cable and pipe seals for generators and turbines roxtec. A convergence of technologies and experience from the most trusted names in mechanical seal manufacture and application, our heritage bw, durametallic, pacific wietz and pacseal brands. With handheld data collection terminal, the staff can easily put on, check or remove the smart seals onsite, which can achieve refined management of metering. Turbine sealing ring, turbine packing ring, turbine. When casing pressure is lower than atmospheric, external steam is supplied via a letdown valve and desuperheater. Sealing system for slurry pump us7438519b2 en 20040907.
The cable transit device is available in four sizes to cover cables ranging from 3. Standardize with roxtec seals to achieve a repeatable manufacturing process for volume production. Find gland sealing system steam turbines related suppliers, manufacturers, products and specifications on globalspec a trusted source of gland. Fire resisting fluid acknowledgements glossary bibliography biographical sketch summary steam turbines consist essentially of a casing to which stationary blades are fixed on the. Turbine engine, seal therefor and method of removing a seal from a turbine engine wo2008105831a3 en 20060914. As turbine exhaust is connected to a condenser which is operated below atm pressure so there are chances of air ingres or va. Gland sealing systemgss of a steam turbine the steam turbine inlet pressure will be in hundreds of bar but when the steam exit, the pressure drops to. It seals the narrow gap between the rotating part and stationary part. This system also prevents air leakage into the low pressure turbine glands.
Very tight clearances are generally used for bushing seals. The steam turbine gland steam seal system is designed to keep steam from leaking out of the turbine and to prevent air from leaking into the turbine. This publication is concerned only with the special carbon gland rings for steam turbine applications and similar glands sealing hot or dry gases. Us4541247a steam turbine gland seal control system. This discussion briefly summarizes some of the devices, seal systems, and operating parameters encountered with turbines and compressors, but because of the magnitude of technical information that would be required, the writer has omitted any comments related to some of the more recent developments, such as welded bellows and aspirated circumferential liquid seals. To restore our turbine rotor gland seal system, we applied twin wire arc spray using inconel 625 with arc bond 955 and hvof for the surface coating. Gland steam sealing system for steam turbine youtube. Turbine gland seal steam system turbine steam free 30day. Overlooked gland seal can be big trouble power services. In this case, seal metal to metal, gland to turbine, with the same sealant used on the split line. We also lead the industry in the duplication of parts and assemblies for rotating equipment such as steam turbines, compressors and more. The system is with ejector and currently the gland steam condenser is in bad performance. Annular gas seals and rotordynamics of compressors and turbines 203 designed to be self centering at low llp readings and to lockup at higher llp readings.
Glands are used on turbine to minimise the leakage of steam or air between the rotating and stationary parts components which have a pressure difference across them. Our seals are capable of operating at speeds in excess of 30msec 98ftsec and pressures in excess of 15 bar 220 p. Function and system layout the two functions of the turbine glands and seals are. The roxtec c rs t is a compact entry seal for single cables requiring a rating up to ip 69k.
The turbine gland sealing system tgss prevents the escape of steam from the turbine shaft and casing penetrations and the glands of main steam stop and. The heat rejected to the main condenser is removed by a circulating. Steins bushing seals are the perfect choice for highpressure gas and liquid applications. Gland type flexible metallic packing water packing carbon packing a watersealed glands and labyrinth seals as used on the highpressure end of condensing turbines. Shaft sealing of steam turbines general electric company. When casing pressure is higher than atmospheric the gland sealing steam passes outward toward the gland steam condenser through a spillover valve.
Gland steam condenser mystery cr4 discussion thread. A gland seal system can be as simple as a spray chamber, loop seal and a steam ejector or as complex. Auxiliary steam from turbine auxiliary steam system tas is supplied to the glands to seal them. A high pressure steam turbine having a sealing gland where the turbine rotor penetrates the casing of the turbine. Thus for a gland with a given number of restrictions, there is an associated pressure ratio that produces the maximum leakage through the gland. The face seal prevents steam from going around the carbon ring while the shaft seal, the rings inner bore, controls steam leakage along the turbine. To sealing turbine before pulling condensate vacumn before start up, gland sealing steam is extracted from the live steam system or auxiliary steam systeam and decreased both pressure and temperature pressure.
It is perfect for power generators and attached control systems, such as skidmounted turbinegenerators. We are the leadingedge service provider of engineered mechanical seals and support services. Is the function of ejector alone can provide the vacuum system and we vent all steam trap at gland steam condenser without condense it. The seal is available with nickelplated brass fittings. Overlooked gland seal can be big trouble december 3, 2015 in steam turbine tips by psgweb. The seal oil then flows from the bottom of the seal oil degassing separator to the atmospheric degassing separator where the remaining minimal volume of entraineddissolved gas is. Can a vacuum system for sealing system in steam turbine work if gland steam condenser cannot fully condense the steam. Steam turbine gland seal control system westinghouse. If your steam piping system lacks one or more of these features you. Unique systems designs and manufactures process vacuum systems including condensers, steam jet ejectors, liquid ring vacuum pumps and hybrids along with instrumentation, complete automation and auxiliary equipment. Proven by history since 1955, stein seal company has been a leading provider of custom designed seals and precision components for use in a wide variety of aerospace, marine and industrial applications. Labyrinth packing an overview sciencedirect topics.
Only use a very light coat of sealant on the turbine face. A game changer for gland sealing in general purpose steam. Smart sealing management system every organization or personnel as well as the current and historical state of smart seals so as to realize the wholelife management of smart seals. We supply three types of seals to suit water turbine main shafts, these are. Turbine gland seal steam system free download as word doc. Wet seal degassing recovery system for centrifugal. It is then when simple cycle power stations are brought on line to supply additional power rather than having to purchase power on the open market. Each bushing seal is custom designed to fit the application and is often combined with our other seals to create sealing systems that meet the most stringent operating requirements. The bonding between the rotor and the twin wire arc spray failed last january 19, 2015. To recall, the thermal spray application was done last september 29,2012. The gland sealing system is designed to supply steam to seal the turbine shaft glands at all operating conditions and to extract leakoff steam from the glands. Introduction during the past 50 years the gland ring has become a standard method for sealing medium and large diameter shafts. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Our suppliers operate to quality systems concurrent to iso9002 and have approved procedures. Download the bapco technical writing style guide freeofcharge. When the rotor dynamics of the system are considered, the number of brush seals that can be placed in the turbine without exciting a critical speed can be determined as is discussed in section 5. Frame 5 series egt sensor featuring type k conductor wire with mgo insulation, hermetically sealed in stainless steel for hightemperature oxidation resistance, vibration resistant hermetic terminations and. What is main purpose of putting sealing steam in a turbine.