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76 results on '"Steam power-plants -- Maintenance and repair"'

1. An algorithm for thermal unit maintenance scheduling through combined use of GA SA and TS

Author

Kim, Hyunchul, Hayashi, Yasuhiro, and Nara, Koichi

Subjects
Steam power-plants -- Maintenance and repair, Plant maintenance -- Planning, Scheduling (Management) -- Methods, Combinatorial optimization -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes a method of solving a large scale long term thermal unit maintenance scheduling problem. In the solution algorithm, the genetic algorithm(GA), the simulated annealing(SA) and the tabu search(TS) are cooperatively used. The solution algorithm keeps the advantages of individual algorithm and shows a reasonable combination of local search and global search. The method takes the maintenance class and several consecutive years scheduling into consideration. Several real scale numerical examples demonstrate the effectiveness of the proposed method.

Published
1997

2. Expansion joint replacement ensures station operability

Author

Youman, Benjamin P. and Scardigno, Peter F.

Subjects
Steam power-plants -- Maintenance and repair, Condensers (Steam) -- Maintenance and repair, Bellows (Mechanical engineering) -- Maintenance and repair, Electric power production, Metal products -- Maintenance and repair, Business, Engineering and manufacturing industries, Petroleum, energy and mining industries, Maintenance and repair
Abstract

Condenser extraction steam line expansion joint (bellows assembly) degradation is an unanticipated roadblock many older stations must pass to ensure their ability to operate reliably and cost effectively. The uncertainty [...]

Published
1998

3. Competition dictates maintenance decisions

Author

Zink, John C.

Subjects
Steam power-plants -- Maintenance and repair, Electric utilities -- Management -- Maintenance and repair, Steam-turbines -- Maintenance and repair, Business, Engineering and manufacturing industries, Petroleum, energy and mining industries, Company business management, Management, Maintenance and repair
Abstract

DETAILED CONDITION MONITORING AND CAREFUL ECONOMIC ANALYSES ARE REPLACING CONSERVATIVE STEAM TURBINE MAINTENANCE PRACTICES. The emerging competitive environment in the electric power business places a premium on minimizing the operation [...]

Published
1998

4. Performance analysis ensures cost-effective maintenance

Author

Kugler, James and Fehr, Stephen L.

Subjects
Delmarva Power & Light Co. -- Management -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Electric utilities -- Management -- Maintenance and repair, Steam-turbines -- Maintenance and repair, Business, Engineering and manufacturing industries, Petroleum, energy and mining industries, Company business management, Management, Maintenance and repair
Abstract

Delmarva power, a conectiv subsidiary, initiated a Performance Improvement Program (PIP) 1986 to identify achievable performance improvements to their fossil steam generating units and then to quantify the benefits of [...]

Published
1998

5. Letting off steam

Author

Delgadillo, Miguel A and Hernandez, Maria A.

Subjects
Steam power-plants -- Production processes, Steam power-plants -- Maintenance and repair, Business, Computers and office automation industries
Abstract

A modified three-element control automated strategy for addressing level control problems in power plant steam generators is presented.

Published
2007

6. Piping retrofit reduces valve-damaging flow vibration

Author

Webb, Mike and Ellenberger, Phil

Subjects
Southwest Research Institute -- Contracts, Public Service Company of Colorado -- Maintenance and repair -- Contracts, Power plants, Steam power-plants -- Maintenance and repair, Electric utilities -- Maintenance and repair -- Contracts, Electric power-plants, Business, Engineering and manufacturing industries, Petroleum, energy and mining industries, Contract agreement, Maintenance and repair, Contracts
Abstract

Public Service Co. of Colorado's (PSCO) Cherokee Station Unit 4 had been experiencing excessive hot and cold reheat safety valve maintenance. From 1990 through 1993, expenditures exceeded $150,000, including a [...]

Published
1995

7. Hybrid Evolutionary Techniques for the Maintenance Scheduling Problem

Author

Burke, E. K. and Smith, A. J.

Subjects
Steam power-plants -- Maintenance and repair, Maintenance -- Models, Business, Electronics, Electronics and electrical industries
Abstract

The incorporation of local search operators into a genetic algorithm has provided very good results in certain scheduling problems. The resulting algorithm from this hybrid approach has been termed a memetic algorithm. This paper investigates the use of a memetic algorithm for the thermal generator maintenance scheduling problem. The local search operators alone have been found (in earlier work by the authors and others) to produce good quality results. The main purpose of this paper is to discover whether a memetic approach can produce better results. We describe the approach taken and highlight the variety of local search algorithms that were employed. We compare the memetic algorithms with a variety of algorithms that include the local search operators on their own and a range of algorithms that apply the local search operator to randomly generated solutions. We see that, for the problems tested, the memetic algorithms produce better quality solutions (although they do take more time about it). Of course, in practice, for a problem like this, the time taken to produce a solution is not a major issue. What is far more important is the quality of the solution. We conclude that the most effective method (of the ones tested here) is a memetic approach that employs a tabu-search operator. Index Terms--Genetic algorithms, Maintenance scheduling, Memetic algorithms, Simulated annealing, Tabu search.

Published
2000

8. Leak detection: Technology catches up to theory

Author

Yon, Marsha, Leonard, Richard, and Shoop, Alvin

Subjects
Leak detectors -- Installation, Steam power-plants -- Fuel and fuel systems, Steam power-plants -- Maintenance and repair, Steam power-plants -- Equipment and supplies, Petroleum -- Pipe lines, Petroleum -- Maintenance and repair, Technology installation instructions, Business, Engineering and manufacturing industries
Abstract

Marsha Yon, Micro Motion, Richard Leonard, Pro-Tech Solutions, and Alvin Shoop, Expert Systems Group Making sure all the oil that goes in a pipeline comes out the other end is [...]

Published
2009

9. Refurbishment of Weiher 680MWe steam turbine

Author

Ehrier, G. and Kotschenreuther, H.

Subjects
Steam-turbines -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Electric utilities -- Equipment and supplies, Business, Petroleum, energy and mining industries
Abstract

Refurbishment of Weiher 680MWe steam turbine Steam power stations in operation today have a fuel to electricity efficiency of around 38 per cent. Figures in excess of 50 per cent [...]

Published
1990

11. Designing steam cycles to avoid corrosion

Author

Jonas, Otakar

Subjects
Steam power-plants -- Maintenance and repair, Steel -- Corrosion, Steel -- Control, Business, Engineering and manufacturing industries
Abstract

Various reasons for formation of corrosion in boilers, steam turbines, condensers and other water-handling equipment are examined. Few methods to avoid this corrosion are also explained.

Published
2006

12. Cycle chemistry commissioning deserves its own strategy

Author

Jonas, Otakar and Machemer, Lee

Subjects
Corrosion and anti-corrosives -- Analysis, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

Delayed startups and damage to plant equipment due to inadequate steam cycle chemistry commissioning are thought to be a major problem for half of all new generating units, as well as for older units that are upgraded or have had their operation or chemistry changed. Commissioning guidelines have two purposes, such as avoiding delays in commissioning a plant and preventing short- and long-term cycle chemistry and corrosion problems.

Published
2004

13. Take a closer look at steam-cycle chemical cleaning

Author

Barber, Steve and Stevens, W.E.

Subjects
Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

Steam-cycle chemical cleaning for power plants was proven to reduce overall unit-maintenance and capital component-replacement costs. The system is effective for removing waterside scale and corrosion materials. US utilities have spent billions of dollars for increased fuel costs and replacement parts due to solid-particle erosion. Total costs of chemical cleaning for a 500-MW boiler is projected at $5 million.

Published
1996

14. Understanding boiler water treatment

Author

Sendelbach, Michael G.

Subjects
Plant engineering -- Methods, Feed-water purification -- Methods, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

Treating water used in the steam generating process improves both boiler water conditions and steam purity. It increases boiler efficiency, reduces fuel costs, minimizes maintenance, extends equipment service life, and [...]

Published
1989

15. Avoid MIC-related problems in nuclear cooling systems

Author

Borenstein, S.W. and Licina, G.J.

Subjects
Corrosion and anti-corrosives -- Prevention, Nuclear power plants, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1990

16. How to monitor performance of steam-plant demineralizers

Author

Selby, K. Anthony

Subjects
Hydraulic engineering -- Equipment and supplies, Feed-water purification -- Methods, Ion exchange resins -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1990

18. Keeping condensers clean

Author

Wicker, Ken

Subjects
Conco Systems Inc. -- Technology application, Conco Systems Inc. -- Production management, Energy industry -- Production management, Energy industry -- Technology application, Condensers (Steam) -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Technology application, Business, Engineering and manufacturing industries
Abstract

A clean condenser can improve the efficiency of a steam power plant. A method followed by Conco Systems Inc., Verona based condenser tube cleaning company, is described.

Published
2006

19. Monitor 'volatiles' on-line continuously, automatically

Author

Gokeler, Ulrich K.

Subjects
Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

A system capable of automatic on-line monitoring of contaminants in water used in steam powerplants is required to comply with regulations that require the analysis of volatile organic compounds in such systems. The system should involve the determination of specific volatiles, automatic sample preparation and analysis, alarms to trigger actions and a short analysis time. The analytical system would be more reliable if the operators are committed to personnel training and preventive maintenance.

Published
1996

20. Stop repeat failures of turbine blades

Author

Babson, Paul

Subjects
Blades -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Steam-turbines -- Maintenance and repair, Business, Electronics and electrical industries
Published
1989

21. Upgrading makes plants better than new

Author

Terhune, R.M.

Subjects
Gas-turbine power-plants -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Turbines -- Maintenance and repair, Business, Petroleum, energy and mining industries
Published
1989

22. Cycling demands close watch on water chemistry

Author

Gilbert, Warren D.

Subjects
Detroit Edison Co. -- Maintenance and repair, Water-supply, Industrial -- Composition, Steam-boiler inspection -- Methods, Steam power-plants -- Maintenance and repair, Business, Electronics and electrical industries
Published
1986

23. Steam turbines-maintenance to upgrade performance

Author

Werner, H.G.A.

Subjects
Power plants -- Maintenance and repair, Steam power-plants -- Maintenance and repair, Steam-turbines -- Maintenance and repair, Business, Petroleum, energy and mining industries
Published
1986

25. Chemical cleaning steam turbine restores output, slashes cost

Author

Fridley, E.S., Foster, C.D., and Shomo, D.J.

Subjects
Steam power-plants -- Maintenance and repair, Copper oxide -- Maintenance and repair, Steam-turbines -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1990

27. Redistribute steam to extend boiler-tube life

Author

Clark, Kimble, Lee, Clayton, Hara, Kevin, and Lefton, Steve

Subjects
Steam power-plants -- Maintenance and repair, Steam-pipes, Business, Engineering and manufacturing industries
Published
1990

28. Reinspection of deaerator welds is key to safe operation

Author

Knarr, Nancy and Thielsch, Helmut

Subjects
Deaerators -- Maintenance and repair, Welded joints -- Inspection, Steam power-plants -- Maintenance and repair, Steam-boilers -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1990

29. Philippines power plant life assessment contract

Subjects
ERA Technology Ltd. -- Contracts, Kephilco -- Contracts, Business consultants -- Contracts, Steam power-plants -- Maintenance and repair, Electric utilities -- Contracts, Consulting services -- Contracts, Contract agreement, Business, Business, international, Petroleum, energy and mining industries
Abstract

ERA Technology Limited of Leatherhead, Surrey, has been awarded a US $1.2m contract by Kephilco for life assessment of 300 and 350MW units at the Malaya Thermal Plant in the [...]

Published
1996

30. Check 50 ft without moving the probe

Subjects
Industrial equipment and supplies industry -- Innovations, Steam power-plants -- Maintenance and repair, Probes (Electronic instruments) -- Innovations
Abstract

A NEW INSPECTION DEVICE PROMISES to simplify the detection of cracks and other defects in power-plant steam tubing. Called a guided wave bore probe, the device can inspect 50 ft […]

Published
1995

31. Hydraulic bolt tensioning gains acceptance

Author

Swanekamp, Robert

Subjects
Steam power-plants -- Methods, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

Steam plants are turning to hydraulic bolt tensioning technology to reduce outage time related to maintenance and life-extension projects. Methods of this technique are discussed.

Published
2002

32. Automated control enhances cooling-water treatment

Author

Thompson, Michael, Karlovich, David, and Behrend, Greg

Subjects
Steam power-plants -- Maintenance and repair, Cooling towers -- Technology application, Feed-water -- Quality management, Business, Engineering and manufacturing industries
Published
1989

33. Optimize cogeneration retrofits with correct water treatment

Author

Sendelbach, Michael G.

Subjects
Cogeneration of electric power and heat -- Management, Feed-water heaters -- Management, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1989

36. Water-treatment control and instrumentation

Author

Strauss, Sheldon D.

Subjects
Feed-water purification -- Management, Steam power-plants -- Maintenance and repair, Corrosion and anti-corrosives -- Management, Nuclear power plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1988

37. Feedwater-heater life extension: let economics be your guide

Author

Rose, David M. and Andreone, Carl F.

Subjects
Steam power-plants -- Maintenance and repair, Steam-boilers -- Maintenance and repair, Feed-water heaters -- Maintenance and repair, Steam-boiler inspection -- Methods, Business, Engineering and manufacturing industries
Published
1986

38. Bromine replaces chlorine in cooling-water treatment

Author

Fellers, B.D., Flock, E.L., and Conley, J.C.

Subjects
Water reuse -- Equipment and supplies, Bromine -- Usage, Corrosion and anti-corrosives -- Prevention, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1988

40. Handling ion-exchange systems for top performance

Author

Lefevre, Leonard J. and Strauss, Sheldon D.

Subjects
Ion exchange resins -- Usage, Water treatment plants -- Maintenance and repair, Chemical engineering -- Methods, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1982

41. Progress in fighting BWR pipe cracks

Author

Fox, Michael

Subjects
Steam power-plants -- Maintenance and repair, Electric power-plants -- Maintenance and repair, Nuclear power plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1981

42. Use amines to control system corrosion

Author

Beecher, Jesse

Subjects
Corrosion and anti-corrosives -- Usage, Amines -- Usage, Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1981

45. Plant alert: don't let erosion/corrosion compromise safety

Author

Jonas, Otakar

Subjects
Steam power-plants -- Maintenance and repair, Business, Engineering and manufacturing industries
Abstract

Preventive measures should be taken in addressing the problems posed by the erosion/corrosion of pipes and other components of steam powerplants. The slow damage caused by flow-assisted corrosion can cause pipe rupture before detection. The walls of carbon steel piping and other components should be inspected with focus on components with low chromium content. Wall thinning could be measured using ultrasonic techniques or radiography. Water chemistry could be optimized to resolve erosion/corrosion thinning.

Published
1996

46. Mill redesign stretches time between overhauls

Author

Pachalag, Shailendra

Subjects
Combustion Engineering Inc. -- Product information, Texas Utilities Electric Co. -- Equipment and supplies, Steam power-plants -- Maintenance and repair, Coal, Pulverized -- Equipment and supplies, Business, Electronics and electrical industries
Published
1989

47. High-purity water monitoring gets better

Author

Gray, David M.

Subjects
Feed-water purification -- Control, Steam power-plants -- Maintenance and repair, Water purification equipment and supplies industry -- Innovations, Business, Electronics and electrical industries, Petroleum, energy and mining industries
Published
1989

48. Water chemistry: two utilities solve a tough problem

Author

Romaine, Scott

Subjects
Electric utilities -- Maintenance and repair, Feed-water purification -- Methods, Steam power-plants -- Maintenance and repair, Business, Electronics and electrical industries
Published
1987

49. Unit feedwater system has advantages

Author

Chady, Daniel and Gilg, Donald

Subjects
Steam power-plants -- Maintenance and repair, Hydrothermal electric power systems -- Maintenance and repair, Business, Electronics and electrical industries
Published
1983

50. Follow cleaning guidelines for high-temperature boiler parts

Author

Siegmund, J.W., Yorgiadis, S., and Dooley, Barry

Subjects
Steam power-plants -- Maintenance and repair, Corrosion and anti-corrosives -- Prevention, Boilers -- Maintenance and repair, Business, Engineering and manufacturing industries
Published
1989

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