Failure analysis on welded joints of 347H austenitic boiler tubes

Lee, Han-sang; Jung, Jinesung; Kim, Doo-Soo; Yoo, Keun Bong

doi:10.1016/j.engfailanal.2015.08.024

Cited by 32 publications

(14 citation statements)

References 13 publications

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“…Some important reasons of the boiler tube failures are reported as salt deposits, fly ash and quick chemical response among water and tube material (Chaudhuri and Singh, 1997), stress corrosion cracks, pits on boiler tube surfaces, creep and gradual destruction (Dhua, 2010). Microstructure assessment and thermo-mechanical analysis of the boiler welded joints have been conducted (Lee et al, 2015) using the finite element method (FEM) and the electron backscattered diffraction analytic technique.…”

Section: Literature Surveymentioning

confidence: 99%

Reliability analysis of a steam boiler system by expert judgment method and best-fit failure model method: a new approach

Patil¹,

Bewoor

2020

IJQRM

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PurposeIndia's textile industries play a vital role in the Indian economy. These industries consume the highest thermal energy (steam power). The demand of the steam in process industries is increasing rapidly, and this demand can be met by increasing the capacity utilization of steam boilers. The purpose of this paper is to present a new approach for reliability analysis by expert judgment method.Design/methodology/approachA lack of adequate life data is one of the biggest challenge in the reliability analysis of mechanical systems. This research provides an expert judgment approach for assessing the boiler's reliability characteristics. For this purpose, opinions of experts on time to failure and time to repair data were elicited in the form of statistical distributions. In this work, reliability analysis of the boiler system is carried out by expert judgment method and by using best-fit failure model. The system reliability along with preventive maintenance intervals of all components is also evaluated.FindingsIt is observed that the reliability analysis results obtained by expert judgment method and best-fit failure model method indicate that there are no significant differences. Therefore, in case when insufficient data are available, the expert judgment method can be effectively used. The analysis shows that the feedwater tank, feedwater pump, supply water temperature sensor, strainer, return water temperature sensor, condensate filter, mechanical dust collector, coal crusher and fusible plug are identified as critical components from a reliability perspective, and preventive maintenance strategy is suggested for these components.Originality/valueIn this research paper, a system reliability model by the expert judgment method is developed, and it can be effectively used where insufficient failure data are available. This paper is useful for the comparative evaluation of reliability characteristics of a boiler system by expert judgment method and best-fit failure model method.

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Section: Literature Surveymentioning

confidence: 99%

Reliability analysis of a steam boiler system by expert judgment method and best-fit failure model method: a new approach

Patil¹,

Bewoor

2020

IJQRM

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“…, 2017), scanning electron microscopy and energy dispersive spectroscopy method (Liu et al. , 2017), failure mode and effect analysis (FMEA), and stochastic method (Moghanlou and Mohammad, 2017), finite element method (Lee et al. , 2015) are reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers have been written about boiler tube failures, their modes of failure and their causes. Failure analysis of the boiler tubes by using various techniques such as residual stress measurements via X-ray diffraction (XRD) method (Duarte et al, 2017), scanning electron microscopy and energy dispersive spectroscopy method (Liu et al, 2017), failure mode and effect analysis (FMEA), and stochastic method (Moghanlou and Mohammad, 2017), finite element method (Lee et al, 2015) are reported in the literature. Several papers are presented on failure analysis of the components of combustion, ignition (Vandermeer, 1998) and fuel feeding systems (Mariajayaprakash and Senthilvelan, 2013;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimization of maintenance strategies for steam boiler system using reliability-centered maintenance (RCM) model – A case study from Indian textile industries

Patil¹,

Bewoor²

2022

IJQRM

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PurposeThis study focuses on the application of reliability-centered maintenance (RCM) to a textile industry steam boiler. The study aims to demonstrate the development and application of RCM to a steam boiler used in the textile industry.Design/methodology/approachRCM is a structured process that develops maintenance activities needed on physical resources in their operational environment to realize their inherent reliability by logically incorporating an appropriate mixture of reactive, preventive, condition-based and proactive maintenance methods. A detailed analysis of the RCM approach is presented to develop preventive maintenance (PM) program and improve the reliability and availability of the steam boiler system.FindingsThe research reveals that the identification of PM tasks is a good indicator of the PM program's efficiency and can serve as an important maintenance-related downtime source. It is also discovered that the majority of maintenance programs that claim to be proactive are, in fact, reactive. This article also shows how RCM may be successfully implemented to any system, resulting in increased system reliability.Research limitations/implicationsThe paper focuses on a pilot study of the development and implementation of the RCM technique to a textile industry steam boiler. It is suggested that the developed RCM model can be applied to the entire plant.Originality/valueThe paper presents a comprehensive RCM model framework as well as an RCM decision framework, providing maintenance managers and engineers with a step-by-step approach to RCM implementation. The proposed framework is significant in that it may be utilized for both qualitative and quantitative analysis at the same time.

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“…The limited operating temperature of martensitic steels resulted in the introduction of austenitic steels in the power industry [ 2 , 3 , 4 ]. Due to their adverse physical properties and susceptibility to intergranular and stress corrosion, the creep-resistant austenitic steels give rise to a number of operational problems [ 5 , 6 ]. Therefore, research aimed at the development of new types of steel with ferritic matrix capable of operating at above 610 (620) °C is being carried out in numerous research centres.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

et al. 2021

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In addition to good high-temperature creep resistance and adequate heat resistance, steels for the power industry must have, among other things, good weldability. Weldability of such steels is one of the criteria determining whether or not the material is suitable for applications in the power industry. Therefore, when materials such as martensitic steel Thor 115 (T115) are introduced into the modern power industry, the quality and properties of welded joints must be assessed. The paper presents the results of metallographic and mechanical investigations of T115 martensitic steel welded joints. The analysis was carried out on joints welded with two filler metals: WCrMo91 (No. 1) and EPRI P87 (No. 2). The scope of the investigations included: microstructural investigations carried out using optical, scanning and transmission electron microscopy and mechanical testing, i.e., Vickers microhardness and hardness measurement, static tensile test and impact test. The macro- and microstructural investigations revealed correct structure of the weld, without welding imperfections. The microstructural investigations of joint No. 1 revealed a typical structure of this type of joint, i.e., the martensitic structure with numerous precipitates, while in joint No. 2, the so-called Nernst’s layers and δ-ferrite patches were observed in the weld fusion zone as well as the heat affected zone (HAZ). The mechanical properties of the test joints met the requirements for the base material. A slight influence of the δ-ferrite patch on the strength properties of joint No. 2 was observed, and its negative effect on the impact energy of HAZ was visible.

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Failure analysis on welded joints of 347H austenitic boiler tubes

Cited by 32 publications

References 13 publications

Reliability analysis of a steam boiler system by expert judgment method and best-fit failure model method: a new approach

Reliability analysis of a steam boiler system by expert judgment method and best-fit failure model method: a new approach

Optimization of maintenance strategies for steam boiler system using reliability-centered maintenance (RCM) model – A case study from Indian textile industries

Microstructure and Mechanical Properties of Modern 11%Cr Heat-Resistant Steel Weld Joints

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