Causes of failure of brass condenser tubes (CuZn28Sn1) in a thermal power plant in Serbia are analysed. Results of testing by Fourier transformed infrared spectroscopy (FTIR) have indicated the condenser tube failure mechanisms power magazine (PDF) Study of the failure of condenser tube in water condenser tube failure mechanisms power magazineStudy of the failure of condenser tube in water cooled centrifugal chiller To cite this article M A Reshi and M Mursaleen J. Phys. Conf. Ser. 1240
Abstract. Failures occurred in admiralty brass condenser tubes in a nuclear plant cooled by freshwater. About 2500 tubes had to be replaced over a span of six y Article Innovations in Condenser Cleaning Technology condenser tube failure mechanisms power magazineSector Power Generation Published in Energy Tech Magazine , this article examines The Practical Application & Innovation of Cleaning Technology for Condensers with a detailed look a fouling mechanisms , prevention of tube -side fouling, chemical treatment and offline mechanical cleaning options. Aspects of Failure of Condenser tubes and their AKS/Journal/2010 Page 1 of 20 Aspects of Failure of Condenser tubes and their Remedial Measures at Power Plants Ashwini K. Sinha AGM (NETRA), NTPC Limited Abstract The demands placed on the condensers of utility generating units are significant.
Under bending loading, the principal failure mode of those tubes is local buckling (wrinkling) of the tube wall. Bending moment, curvature and ovalization are monitored through the numerical analysis, and compari is conducted with available test data on two 42-inch-diameter tubes , with D/t ratio of 67 and 119, described in detail elsewhere. Condenser Performance Assigning condenser tube failure mechanisms power magazine - Power EngineeringThe Condenser Fouling Event Performance Degradation Realized Conclusions As can be seen in the cleanliness factor (CF%) graph in Figure 1, an event took place at the plant on June 6, 2013. Although the degradation occurred rapidly, it was actually precipitated by a buildup rather than a sharp shift. The event was initially believed to be due to a loss of scale inhibitor, biocide or some other chemistry upset, which was followed by a mechanical cleaning and sharp improvement shift on Aug. 6. Chemistry upsets typically result in gradual degradation See more on power-eng Failure analysis of the condenser brass tube in 150 MW condenser tube failure mechanisms power magazineIn this case study, the failure cause of a condenser brass tube in 150 MW thermal power units was investigated. The features of erosion were observed by macro and micro observations, and the condenser tube failure mechanisms power magazine Condenser Retubing - POWER MagazineSchedule-Driven Processes Managing Processes and Manpower Removing Tubes Tubesheet and Support Plate Hole Preparation Tube Installation and Expanding Vibration Mitigation The condenser is designed to last the life of the power plant and has no moving parts, yet it has tens of thousands of mechanical joints and hundreds of thousands of square feet of very thin surface area. The condenser operates in a strong vacuum while withstanding the impact of millions of pounds of steam each hour on the outside of the tubes and millions of gallons of cold water flowing through the See more on powermag Condenser Tube Life Cycle Economics - Coal PowerA number of potential failure mechanisms are possible in power plant heat exchanger tubing. To compound the condenser tube failure mechanisms power magazine extremely rare for TP 304 and TP 316 tubing to fail from this mechanism . Condenser Tube Life-Cycle Economics Page 4 of 11 condenser tube failure mechanisms power magazine While not explicitly a material failure mechanism , condenser tube fouling is a common cause for increasing heat
Condenser Tube Failures and Some Challenges in Development of Cooling Water Treatment Program for Power Plants Ashwini K Sinha Principal Consultant, CWMC (Ex-Additional General Manager (NETRA), NTPC) Core Member, CII-Avantha Corrosion Management Committee, Member NACE International, Life Fellow Member SAEST [email protected] Condenser Tubes - an overview ScienceDirect TopicsThe material most commonly used when suspended abrasive matter is a problem is the 30% Ni alloy containing 2% each of Fe and Mn. 156,157 A difficult condenser -tube corrosion problem arises from the use of polluted cooling waters from harbors and estuaries, which may be severely contaminated, particularly when warmer climates are involved. 162 Many condenser -tube Cooling Water & Condensers Guidebook- 2nd Edition - Condenser Tube Failure Mechanisms . The operating environment within a condenser is extremely harsh, and in spite of the designers best intentions, sometimes tubes made of the best materials fail. The most important tube failure mechanisms typically result from different forms of corrosion and erosion. When its time to select
This paper explains the discovery of, and background to, the tube failure mechanism . In Increase in manganese concentrations within the cooling DeepDyve - Unlimited Access to Peer-Reviewed JournalsDeepDyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Design Considerations and Operation of Condenser Bypass condenser tube failure mechanisms power magazineAs many Combined Cycle Power Plants have come into operation over the last 10 years, premature condenser tube failures have been experienced at several installations. This paper reviews factors and mechanisms contributing to such failures. The steam turbine condenser must operate under a demanding, wide range of conditions.
This paper identifies the potential causes of condenser and heat exchanger tube failures and their alternative solutions, the impact of metal transport and provides tools to assign costs to help develop an economic justification for the replacement using a life-cycle analysis. In addition to the cost for treatment chemicals, the paper condenser tube failure mechanisms power magazine Engineering Failure Analysis - ResearchGateFailure investigation of a boiler bank tube from a 77 2 MW coal based thermal power plant in the northwest region of India M. Ananda Rao , T.S.N. Sankara Narayanan Eupora - DOM Tubing Manufacturing Process - Plymouth TubeCondenser Tube Life Cycle Economics Tags Power Generation, Condenser Tubing, Coal Power Magazine . The challenge for plant operations staff is to understand the possible material failure mechanisms and keep an eye on those exchangers beginning to show signs of tube failure . Download Article
This paper presents an analysis of condenser titanium tube leakage in nuclear power plants. Chemical compositions, mechanical properties, metallographic structures, and microscopic morphologies were analyzed. The results show that the titanium tube leakage was mainly caused by fatigue failure on the basis of the fatigue fracture features. Fatigue tests had Failure Analysis on Leakage of Brass Condenser Tube in condenser tube failure mechanisms power magazineThe corrosion failure analysis of the brass tube in a power plant condenser was conducted by the methods of chemical composition analysis, macro morphology inspection of the leakage point, metallurgical examination, scanning electron microscope and Failure analysis on abnormal wall thinning of heat condenser tube failure mechanisms power magazineIn Part I of the failure analysis on abnormal wall thinning of heat-transfer titanium tubes used in condensers in nuclear power plant, we analyzed the causes and mechanisms of abnormal thinning that commonly happened at the contact part between the tubes and the support plates.
Failure and Metallurgical Analyses. Sheppard T. Powell Associates, LLC (STPA) has performed over 6,000 metallurgical jobs for our clients primarily in the power and pulp & paper industries. Typically, metallurgical jobs involve one to eight tube samples, although some of these jobs have involved 30 or more tube samples. Failure of titanium condenser tube - ScienceDirectAfter 15 years of service, a condenser tube made of titanium was found suffering from a large size perforation. The titanium bundle was put in service in August 1995 and the failure was observed during a turnaround in December 2010. The tube material is titanium Grade 2 with the dimensions 25.4 mm outside diameter and 1.24 mm thickness. Failure of titanium condenser tube - ScienceDirectHighlights The present work revealed that the mode of failure of a totally plugged titanium condenser tube could be different from the known dominant modes. During the initial stages of crystallization, the tube suffered from erosioncorrosion due to turbulent flow conditions and suspended solids. When the tube was totally plugged, growth of a brittle oxide scale took
months out of exploitation. The failure of brass condenser tubes was also observed in previous years during overhauls, but in lesser quantity. The power plant has most condenser tubes made of brass CuZn28Sn1. Other tubes are made of a copper nickel alloy (CuNi90-10). Fracture is observed only in condenser tubes of brass CuZn28Sn1 (admiralty brass). How is the impact of condenser tube leakage assessed?How is the impact of condenser tube leakage assessed?The impact of condenser tube leakage can be assessed from the following data Values of different constituents' ingressing in the boiler water in case of condenser tube leak S.No Parameter Water quality Amount of different constituent in 1% tube leak g/hr Increase of constituent in boiler water (ppb) Aspects of Failure of Condenser tubes and their Remedial Measures at condenser tube failure mechanisms power magazine M The Seventh Meeting of the EHF Final Programme U R HRSG tube failures (HTF) (FAC, thermal fatigue, creep-fatigue, under-deposit corrosion) Pressure part failure mechanisms related to condensate, drains, and attemperator systems Identifying and avoiding damaging thermal transients in pressure parts Water treatment and cycle chemistry for HRSGs
Failure Analysis on Leakage of Brass Condenser Tube in Thermal Power Plant Yunan Wang1*-2, Tianpeng Wang1 and Mingcheng Sun1 1 State Grid Liaoning Electric Power Research Institute, Shenyang 110006, China 2Liaoning Dongke Electric Power Co.Ltd. , Shenyang 110179 ,China *Corresponding authors e-mail [email protected] Abstract. PLYMOUTH TUBE CO USAIn Condenser Tube Failure Mechanisms , Janikowski reviews the erosion and corrosion implications of specific critical tubing environments such as cooling water attacks, steam-side failure mechanisms , and hydrogen embrittlement. Dan Janikowski is a featured speaker at the upcoming Condenser Life Cycle Seminar (CLCS) in San Antonio. For Power Store - POWER MagazineTaming Condenser Tube Leaks, Part I. Taming Condenser Tube Leaks, Part II. Titanium Tubing Still Going Strong After 40 Years. Acceptable alternatives to titanium tubing. Improving Condenser O&M Practices. Condenser Tube Failure Mechanisms . Condenser Retubing Optimizing Condenser Tube Selection. CWA 316(b) Update Fish Guidance and Protection condenser tube failure mechanisms power magazine
(2018). Power station condensers their design and failure modes. Energy Materials Vol. 13, No. 2, pp. 407-414. Preventing Condenser Tube Failures Through Effective condenser tube failure mechanisms power magazineIn fact, the Condenser Tube Failure Control Program of Electric Power Research Institute (EPRI, Matthews, J.) disclosed that condenser tube failures contributed to almost 25,000 outages nationwide during a recent four year period and continue to be one of the most pressing issues related to plant output and availability. Protecting Your Steam Turbine from Corrosion - Power condenser tube failure mechanisms power magazineHow Do Impurities Enter Steam? How Impurities, Even at Trace Levels, Can Damage The Turbine Information from The Electric Utility Chemistry Workshop DonT Forget About Shutdowns and Layups Because steam generating power plants, both conventional units and heat recovery steam generators (HRSGs), operate at high temperatures and pressures, very pure makeup water is a requirement to prevent corrosion and scaling. The core treatment process at many plants for high-purity water production is, following suitable pretreatment methods, two-pass reverse osmosis with either mixed-bed ion exchange or electrodeionization polishing of the RO effluent. Regardl See more on power-eng Design Considerations and Operation of Condenser Bypass condenser tube failure mechanisms power magazinePremature condenser tube failures in combined cycle power plants have been experienced at several installations related to fatigue and erosion of the condenser tubes . The admission of high energy steam into the condenser poses design challenges with respect to the compact design of the condenser in the combined cycle power plant.
Title QUIZ Taming Condenser Tube Leaks Common Condenser Tube Failure Mechanisms Subject Publication Created Date 12/16/2013 12:47:00 PM Qualification of Laser Welded High Performance S44660 condenser tube failure mechanisms power magazineThe laser tube welding process has for the first time been used to produce power plant steam condenser tubing in the high performance ferritic stainless steel grade UNS S44660. This material has traditionally been produced as welded tubing by the gas tungsten-arc welding process for use in seawater and other severe cooling water environments. Taming Condenser Tube Leaks, Part II - POWER MagazineCurrent POWER Magazine Issue. condenser tube failure mechanisms power magazine Common Condenser Tube Failure Mechanisms . In our experience, the most common causes of condenser tube failure are related to erosion, corrosion, or some form of condenser tube failure mechanisms power magazine
Fac in Conventional Boilers Fac in HRSGs Inspecting For Fac References Author Classical steam generation chemistry teaches that when a boiler is first fired, and where the feedwater and boiler water contain little or no dissolved oxygen, carbon steel feedwater piping and boiler tubes develop a protective layer of magnetite (Fe3O4), while copper alloy heat exchanger tubes develop a protective layer containing cuprous oxide (Cu2O). Throughout much of the last century, utility chemists were taught to completely remove oxygen from feedwater to prevent oxi See more on power-eng Failure analysis of the condenser brass tube in 150 MW condenser tube failure mechanisms power magazineIn the present paper, a failed condenser brass tube used in 150 MW thermal power units was investigated to find out its failure cause. In the end, a conclusion was reached after performing chemical analysis, macroscopic inspections, SEM observations, EDS analysis, and metallographic examinations. 2. Backgrounds. Tube Side Corrosion in Heat Exchangers A Case Study condenser tube failure mechanisms power magazineTube side corrosion in heat exchangers is a major concern in the design and operation of these equipment. This paper describes a particularly serious occurrence of what was interpreted to be Microbiologically Increased Corrosion (MIC) in a carbon steel condenser that lead to premature failure of the tubes by perforated corrosion pits. What causes a condenser to have a pitting problem?What causes a condenser to have a pitting problem?Indirect attacks can be caused by several factors, including accumulation of deposits that form a barrier between the cooling water and tube material, allowing a corrosion cell to form underneath, or by microbiologically influenced corrosion (MIC). Pitting is often a result, which can cause tube failure well before the materials life expectancy.Improving Condenser O&M Practices - POWER Mag
Because the total concentration of all contaminants in the steam cycle water chemistry is usually measured in parts per billion, steam cycle water chemistry is normally considered nonaggressive to most alloys. However, by actively condensing the steam, the condenser will concentrate gases that dont condense at the same temperature as the steam. The most common contaminates include gases like oxy Cooling Water Attacks The Effect of Material Properties Hydrogen Embrittlement In addition to general corrosion, many condenser tubes are susceptible to galvanic-driven mechanisms such as pitting and crevice corrosion. These failure mechanisms usually have two stages an incubation or initiation period and a propagation mode. The time of initiation is rarely determinable. It could be as short as in a few weeks or may take years. Once initiated, the propagation mode can proceed rapidly, driven by the electropotential between the depassivate See more on powermag 9 mins Improving Condenser O&M Practices - POWER MagazineCurrent POWER Magazine Issue. condenser tube failure mechanisms power magazine Condenser Tube Failure Mechanisms . by POWER . O&M. condenser tube failure mechanisms power magazine or a condenser tube leak or failure occurs, the tube must be plugged, so you must have the right tube plugs condenser tube failure mechanisms power magazine 10 mins Condenser Tube Fouling and Failures Cause and Mitigation condenser tube failure mechanisms power magazineThe two most common condenser tube problems faced by chemists are internal tube fouling and tube failure . Fouling can have a major impact on power station generating efficiency and capacity, and tube leaks can seriously impact unit availability and reliability. Fundamental understanding of the root cause (s) of these issues, and their condenser tube failure mechanisms power magazine
Current POWER Magazine Issue. condenser tube failure mechanisms power magazine While not explicitly a material failure mechanism , condenser tube fouling is a common cause for increasing heat rates and can be expensive to repair. Fouling can condenser tube failure mechanisms power magazine 8 mins What causes the tubes in a condenser to fail?What causes the tubes in a condenser to fail?The operating environment within a condenser is extremely harsh, and in spite of the designers best intentions, sometimes tubes made of the best materials fail. The most important tube failure mechanisms typically result from different forms of corrosion and erosion.Condenser Tube Failure Mechanisms - POWER MagazineFile Size 1MB Page Count 20 Failure of Titanium Condenser Tubes After 24 Years Power condenser tube failure mechanisms power magazineThe titanium condenser has been in operation for 24 years at Amager unit 3 power plant. In February 2012, the plant was contaminated by seawater due to a failed condenser tube and some tubes were plugged. A month later, the plant tripped again. Small leaks were found again and finally approx. 200 tubes were plugged before the condenser
Condenser Tube - TIMET Report October, 2011 18. Schumerth, D.J., Valtimet, Inc. - Titanium Powerplant Surface Condenser Tubing 40 Years and 600,000,000 ft later, EnergyTech Magazine (ASME Publication) June, 2011, Titanium Still Going Strong After 40 Years, Power Magazine July, 2011 19.
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