In addition, provisions for manual barring in the event of failure of hydraulic turning. Industrial and aeroderivative gas turbines, steam turbines, and all rotating equipment. Aug 05, 2016 an overspeed failure on a big steam or gas turbine is one of the most frightening of industrial accidents. Maintenance partners is the onestopshop for steam turbine maintenance. Modern large steam turbine plants over 500mw have efficiencies of about 4045%. Heavyduty gas turbine operating and maintenance considerations repairs, and downtime. The steam turbine is just one cost component in a complete chp plant. The best way to ensure the longterm performance of your elliott stg is through a collaborative maintenance agreement. Causes and solutions steam turbine rotors bend during operation, but the bearing and supports are designed to keep the static and dynamic forces under control. Steam system inefficiency causes lost profit in areas such as. The problem could be eliminated by using a working fluid with a very. When properly operated and maintained including proper control of boiler water chemistry, steam turbines are extremely reliable.
We understand the industrys needs and expectations and can usually respond in a timely manner. A look into our broad portfolio of steam capabilities. Turbine steam path maintenance and repair volume 2. We have all the expertise needed for complete overhauls, repairs, reconditioning, upgrades, revamps and relocations of steam turbines, regardless of type or make. The development of steam turbine from the theoretical stage to its present worldwide adoption has three main inputs. Training operation and mechanical maintenance due diligence inspections. Turbine generator rotor vibranon the spinning turbine generator rotods the major source ofpulsating forces. Steam turbines are one of the most versatile and oldest prime mover technologies still in general production used to drive a generator or mechanical machinery. Best practices for steam turbine maintenance and operation.
In case of turbines with cooling water preheating and lowpressure lp bypass, prior to supplying steam the regeneration and dumping systems have to be. Geothermal power plant, steam turbine maintenance, failure mode and. Combined heat and power technology fact sheets series. To determine if your facility could benefit from a steam system maintenance program, make a quick inspection and see if any of these problem areas are in your facility. Steam turbine maintenance is of high importance to keep the steam turbines efficiency high and to conform to safety standards to avoid any unforeseen dangers. The course will cover all aspects of steam turbine maintenance including steam tur bine systems, component maintenance and repair, assembly and disassembly of major items together with steam turbine theory and operations. The first steam turbine used for power generation was invented in 1884. The facility is not required to maintain a pool of steam system experts. Operation and maintenance schedule of a steam turbine.
What are the problems that can occur while running a steam. Maintenance and overhaul considerations need to consider. Troubleshooting bearing and lube oil system problems thomas h. The high cost of an extensive overhaul due to an undetected component failure. Steam turbine maintenance, failure mode and effects analysis fmea utdrattur gufa ur borholum er almennt notu. The steam turbine operates under high steam pressures, and has a number of moving parts. The best way to ensure the longterm performance of your elliott stg is through a collaborative maintenance agreement with elliott field service. This is a combination of the gas turbine and a steam turbine. Common refinery and petrochemical problems and armstrong solutions. Steam turbine training governing system training course. Instruction manual for single stage 350, 500, and 700 frame. Operations and maintenance operating cost assessment report taylorville energy center.
This instruction manual contains installation, operation, and maintenance instructions for the dresserrand turbine identified on the turbine data sheet included with this manual. This paper discusses the basic steam turbine design philosophy used by ge and summarizes some of the key technology programs which will support steam turbine designs for the 90s. Steam turbine repairs our vision is to support the worlds best running steam turbine fleet, and we do this by delivering new capabilities and programs, all of which are driven by a culture of accountability and a commitment to your organizations desired outcomes. Three major steam turbine repair types have become clear as a result of this shift in maintenance focus. May 12, 2011 steam turbine operation and performance require the correct steam pressure at the turbine inlet and high steam quality steam without condensate entrapment to ensure high turbine reliability.
Condensate entrapment in the steam supply increases turbine steam rates, reduces the steam turbine efficiency, and causes erosion of steam turbine components governor valves, blading, and nozzles. Steam turbine generator maintenance programs elliott group. Steam turbines are made in a variety of sizes ranging fromsteam turbines are made in a variety of sizes ranging from small turbine is turned by steam turbine shaft turns due to high pressure of steam pushing against series of giant turbine blades. In an extracting type turbine, steam is released from variousin an extracting type turbine, steam is released from various stages of the turbine, and used for industrial process needs or sentstages of the turbine, and used for industrial process needs or sent to boiler feed water heater to. By understanding what causes a problem to occur, it should be possible to. This expertise can be used to restore equipment to maximum performance, making your steam turbine. We have had the opportunity to work on a variety of.
Should further information be desired, or should particular problems arise, the matter should be referred to dresserrand. For some old and small steam turbines, the stop valve may be a manual valve with a large handwheel. 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. Ethosenergy provides an extensive range of onsite services including project management, seasoned technicians, labor supervision, health and safety training and millwright work to assist with regular steam turbine inspections, various maintenance activities, major or minor overhauls and complex repairs. Reduction in cooling requirements because cooling is required to be carried out only on the steam turbine portion of the cycle. Discuss the purpose of the materials used in engine field cleaning. Implementing a steam system maintenance program can save time, reduce costs, and improve operating efficiency and product. Superheated steam area of the plant common problems encountered armstrong solutions and best practices utilities steam superheated steam trap distribution lines wet steam to turbines superheat series sh.
Our staff of experienced and highly skilled engineers, managers and technicians is adept at precision installation, machining and welding processes. The myr produces more power without additional steam, and can be installed in many areas where singlestage steam turbines currently are operating. Right, here a piece of stainless steel is being welded over the side of the casing seat. Our innovative and meticulous approach will minimize lost production time and provide unparalleled customer satisfaction. Operators guide to general purpose steam turbines wiley. How to start a steam system maintenance program by field data specialists, inc. This is why the machine vendors specify a particular range of pr. This manual is intended for use by personnel with a general knowledge of proper operation and maintenance of steam turbines. Feb 26, 2017 lecture series on steam and gas power systems by prof. The owners operating mode and practices will determine how each factor is weighted. There are steam turbines that have been in service for over 50 years. There are instances where utilities and other owners have spare 309 turbine steam path troubleshooting and repairvolume two rotors or replacement.
We also provide services between major overhauls, such as endoscopic inspections, vibration measurements and troubleshooting based on operating data from the control. He received the asme george westinghouse gold medal in 1995 and. Gte gas turbines fundamentals, maintenance, inspection and. Thus you tend to get lower than predicted power output to a certain pressure provided the steam remains superheated at that pressure. Recent trends in repair and refurbishing of steam turbine.
Steam turbine plants generally have a history of achieving up to 95% availability and can operate for more than a year between shutdowns for maintenance and inspections. Sanders is one of the foremost steam turbine experts in the field. Hp products turbine powerhead and hand held turbine powerhead instruction manual 10 pages. The same valve may also be used for starting the unit. A major steam turbine repair can cost ten or more times that of a garden variety centrifugal pump repair. Diakont is a trusted supplier of industryleading electric servo actuators and control systems for the energy industry.
The following addresses best practices for optimal steam system turbine maintenance and operation. The steam turbine generator is the primary power conversion component of the power. The above picture is just a screen shot, click to see demo. Steam turbine repair services steam turbine repairs our vision is to support the worlds best running steam turbine fleet, and we do this by delivering new capabilities and programs, all of which are driven by a culture of accountability and a commitment to your organizations desired outcomes.
Maintenance and overhaul of steam turbines imia, the. Pdf troubleshooting turbine steam path damage mechanisms. Diakont has extensive experience in supplying actuators and control modules for steam, gas and hydro turbine control valves for turbine manufacturers and automation companies worldwide. Open bypastracing leaks poor energy rating eiipacking leaks if these prreduced life of turbine nozzle block, carbon, and shaft manual adjustment of steam. Downtime can be expensive and unplanned downtime can be extremely disruptive. Discuss the purpose and types of borescopes used today. Independent turbine consulting turbine generator experts. The turbine shaft is connected to the generator shaft, where electricity is produced when magnets spin within wire coils. If these prreduced life of turbine nozzle block, carbon, and shaft manual adjustment of steam. This article will outline the necessary steps to take while managing major. Itc was started in 2010 and has quickly filled an urgent industry need for qualified, experienced turbine generator field engineers to provide technical direction, consulting, and. Noles references module 23414 turbine operational problems.
Their unplanned or forced outage rates are typically less than 2% or less than one week per year. Prior to supplying steam to the turbine, the steam supply pipelines have to be drained and heated up. Left, wear in a casing seat, the side of the seat has been milled down. In addition, a control system is needed and emission reduction hardware may be required depending on local air quality requirements. Operation and maintenance schedule of a steam turbine plant, 99 pages, 2. The large, high flow compressors are practically all driven by steam turbines.
Many maintenance managers are now faced with developing significant steam turbine repairs plans vs. Hundreds of years combined experience in all aspects of steam turbine generator, systems, maintenance, engineering,rerates, applications, and design. The primary factors that affect the maintenance planning process are shown in figure 1. The design of reliable, efficient steam turbines requires the application of many diverse areas of technology. Minimum of 3 years of steam turbine maintenance experience with stationary and rotating components understanding of steam turbine thermodynamics highly energized selfstarter who can work independently masters degree in mechanical engineering or related discipline training or proficiency in steam turbine design andor thermodynamics. Rail king 686 steam turbine engine operating instructions manual 32 pages. Mccloskey has over 25 years experience in the design, operation, maintenance and troubleshooting of steam turbines, pumps, and related auxiliaries, and holds six patents in mechanical engineering and steam turbine design. Instruction manual for single stage 350, 500, and 700. Ethosenergy provides both field and shop services focused on reliability and efficiency. Figures 1 and 2 depict some very early turbine steam path failures showing. Steam turbines drive boiler fans, process and chiller.
All aircraft maintenance activities are plagued by repeat. Steam is reconverted to water when its work on the turbine is done, the steam is drawn into. Identify the types of troubleshooting drawings and diagrams 6. Aug 01, 2017 this video show you understanding how to assembly the steam turbine. The duties include maintenance, repair and overhaul of a variety of steam plant equipment. Predictive maintenance of rotating plant is vital to the budgetary success of the operations organisation. Independent turbine consulting itc is a group of turbine engineers specializing in gas and steam turbine consulting, maintenance, repairs, projects, and outages. Operation and maintenance schedule of a steam turbine plant. For turbines supplied with options such as forced or circulating lubrication systems, alternative speed control systems, accessories, instrumentation, speed reducers or other special configurations, refer to the appropriate accessory manuals and turbine certified drawing package included in appendix a and appendix b following this manual.
Turbines a turbine is a rotary engine that exerts energy from a fluid flow and converts it into useful work. An overspeed failure on a big steam or gas turbine is one of the most frightening of industrial accidents. Causes and solutions steam turbine rotors bend during operation, but the bearing and supports are designed to. Steam quality steam must be of the highest quality. A properly maintained elliott steam turbine generator stg can operate reliably and efficiently for decades. Khalil department of mechanical power engineering, cairo university, cairo, egypt. Steam turbine services can help execute your outage, forced or planned, from full load to full load. Our steam turbine services cover repairs and overhauls, including the engineering and supply of spare parts and building andor programming control systems. Since 1982, he has been a private consultant with turbotechnic services, inc. There are two basic types of turbines according to the mode of steam. Ger3705 ge steam turbine design philosophy and technology. The increase in the size and complexity of steam turbines has resulted in maintenance being accepted as an important mainstream function in such companies. Codes and regulations on repair welding among the various codes and regulations that have been used to lay down guidelines and procedures for repair welding, those from the us nuclear regulatory commission are the most.