Estimation of the residual life of steam-turbine condensers based on statistical models

Murmansky, B. E.; Aronson, K. E.; Brodov, Yu. M.

doi:10.1134/s0040601515110051

Cited by 5 publications

(6 citation statements)

References 1 publication

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“…n o ^4, 299, 1:33 f g determine the estimate of the value of the number of pipes n e,i in a given time. Enabling the cooling water flow through the minimum number of pipes n e,i = 2100 pipes enables the use of a reliability structure with the number of pipes constituting the maximum excess in a specific reliability structuremodel (17). Enabling the cooling water flow through the maximum number of pipes n e,i = 12,000 requires the use of a series structure model (18).…”

Section: Discussionmentioning

confidence: 99%

“…The performed simulation refers to the empirical research on damages to the condenser pipes included in publications, 16,17 on the basis of which a normal distri-bution was assumed. The parameters of this distribu-tion m = 15.7 and s = 6,2 refer to 100 condenser pipes.…”

Section: Mathematical Model Of Pipe Subsystem Reliability: Heat Trans...mentioning

confidence: 99%

“…The next Figures 8 and 9 show the development of the block named 2100 pipes. Figure 8 shows a block diagram of the reliability structure of the pipe subsys-tem R ps, r (t)2 formula (17), status: Table 1, day 1, hour 3, that is, t i = 3 (h), where the sub-diagram R, i-100 of 2000 expresses 20 systems (R R, 1, i (t) = ½R 4, i (t) 100 ) pipes in the threshold structure k out of n and sub-diagrams NR, 1-NR, 5 pipe systems (R NR, 1, i (t) = ½R 4, i (t) 2000 ) in the structure of k out of n. Figure 9 shows a block diagram of the reliability structure of the pipe subsystem R R (t)formula (14), where blocks R, 1 to R, 20 express 20 systems (R R, 1, i (t) = ½R 4, i (t) 100 ) pipes in the threshold structure k out of n. Example (18) of estimating the reliability of R ps, r of the pipe subsystem in time t = 3 h under specific oper-ating conditions…”

Section: A Set Of Models Of Reliability Structures Used For Simulationmentioning

confidence: 99%

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Computer simulation of the reliability of the heat exchange surface of the steam turbine condenser

Łukaszewski

2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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The aim of the article is to demonstrate the relationship between the adaptive regulation of the heat exchange surface to specific operating conditions of a steam turbine condenser and the reliability and availability of this surface in a specific period of time. The article exemplifies the relationship between the settings of the condenser heat exchange surface and the resulting changes in the reliability structures of this surface. The method of creating a mathematical model of reliability estimation, which is characterized by the variability of the reliability structures of the heat exchange surface in relation to specific operating conditions in a specific period of time, was indicated. Then, exemplary simulations of the adaptation of reliability structures of specific pipe systems constituting the condenser’s heat exchange surface to specific processes of operation of this condenser are presented. The simulations refer to the time-varying thermal loads of the condenser, the time-varying mean thickness of the sediments, and changes in the temperature of the cooling water at the point of its intake over time. The adaptation of certain reliability structures consists in the adaptation of specific systems of pipes through which the cooling water flows to the currently existing operating conditions of the condenser in order to maintain the desired reliability of the heat exchange surface for a specified time. This is done by enabling or disabling the flow of cooling water through a given number of pipes in specific systems under given operating conditions. On the basis of computer simulations, the reliability functions, and the availability functions of the subsystem under consideration were estimated.

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Section: Discussionmentioning

confidence: 99%

Section: Mathematical Model Of Pipe Subsystem Reliability: Heat Trans...mentioning

confidence: 99%

Section: A Set Of Models Of Reliability Structures Used For Simulationmentioning

confidence: 99%

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Computer simulation of the reliability of the heat exchange surface of the steam turbine condenser

Łukaszewski

2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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“…al. [5] proposed two model that can be implemented based on tubes data availability. The first model can be used when the comprehensive information about the initial period and normal operating period of condenser tubes before their first failure is available (tubes are plugged).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Condensor Tube Thinning Distribution and their Failure Modes Based on Eddy Current Data

Rozaq

Mubarok

2020

KEM

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The condenser in Steam Power Plant is critical equipment to convert steam from the steam output of the low-pressure turbine to become liquid. Thus, maintaining the reliability of the condenser will prevent progressive failure to other equipment. One of the methods to investigate their reliability is using eddy current test on the pure titanium grade 2 condenser tubes to measure their wall thinning level in comparison to their original thickness of 0.5 mm. Based on the measurement, any tubes having 0.05 mm in thickness (wall thinning level of 90%) and below are plugged to prevent potential leakage. In 2018, the condenser in unit 2 of Labuan steam power plant in Banten province, Indonesia was tested by eddy current on all tubes. Results indicate that condenser tube with wall tube thinning ≥ 90% were totaling 733 tubes (± 5% of the total tubes). The location and distribution of the highest probability of tubes leaking due to wall thinning problems were generated after statistical analysis. The data obtained in this unit can be used as a reference for maintenance strategy on other units working in the same condition. In order to understand the tube thinning mechanism, one tube at A-side inlet that has 97% of wall thinning level was cut and submitted to metallography and hardness testing. The results point out that no crack or corrosion product was found and the microstructure of the tubes did not alter as compared to their original tubes. This indicates that pure erosion mechanism takes place causing the thinning of the tubes.

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“…The calculation example pertains to empirical studies of the damage to the condenser pipes, included in publication [1,15], on the basis of which, normal distribution has been assumed. The parameters of the distribution m=15,7, and σ=6,2 as for 100 pieces of condenser pipes were included into the calculation on the basis of studies of damages to condenser pipes of power units 225MW (publication [15]).…”

Section: Exemplification Of the Adaptive Characteristic Of The Heat Ementioning

confidence: 99%

Adaptive reliability structures of heat exchange surface in turbine condenser

Łukaszewski¹

2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl IntroductionThe aim of the paper is to prove adaptive reliability structures of heat exchange surface, which stems from the matter of regulating the surface in order to maintain effective process of heat exchange by sustaining the requested pressure of steam condensation in variable exploitation conditions, which determines changes in the pipe system of the condenser and involves assessment of reliability of its surface of heat exchange.Adaptive reliability structures of surface of heat exchange (pipe subsystem) are the reliability structures, which are altered in the course of adjusting the pipe system to the actual exploitation conditions of the condenser in the power system.Having delved into the current state of the art with IT data bases (Science Direct, Knovel, Nauka Polska, BazTech, google) it was concluded that there has been no algorithm for assessing reliability of surface of heat exchange of steam turbine condenser which would include regulation of the surface in order to exchange the heat effectively and sustain the requested pressure of steam condensation in variable exploitation conditions, which has a significant influence on the quality of the technical power system exploitation, in which the condenser is a part.Publication [10] shows that sustaining given pressure of steam condensation in the condenser in variable conditions is vital for maintaining requested power efficiency of the technical power system. The aforementioned publication puts forward a particular technical solu-

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Estimation of the residual life of steam-turbine condensers based on statistical models

Cited by 5 publications

References 1 publication

Computer simulation of the reliability of the heat exchange surface of the steam turbine condenser

Computer simulation of the reliability of the heat exchange surface of the steam turbine condenser

Analysis of Condensor Tube Thinning Distribution and their Failure Modes Based on Eddy Current Data

Adaptive reliability structures of heat exchange surface in turbine condenser

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