Failure analysis of bolt connections in fired heater of a petrochemical unit

Farrahi, G.H.; Kashyzadeh, Kazem Reza; Mostafazade, A.; Mahmoudi, A.H.; Afshin, Hossein

doi:10.1016/j.engfailanal.2018.06.004

Cited by 11 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Eventually, during the manufacturing and handling of any stainless steel, precautions should be taken to avoid contamination. To analyze failure and identify its main causes in industrial parts, it is necessary to research all the possible causes, and in some cases, in addition to using evidence, the answer can be obtained by rejecting the possible causes [11,[165][166][167][168].…”

Section: Practical Solutionsmentioning

confidence: 99%

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

2023

View full text Add to dashboard Cite

Kaplan turbines, as one of the well-known hydraulic turbines, are generally utilized worldwide for low-head and high-flow conditions. Any failure in each of the turbine components can result in long-term downtime and high repair costs. In a particular case, if other parts are damaged due to the impact of the broken blades (e.g., the main shaft of the turbine), the whole power plant may be shut down. On the other hand, further research on the primary causes of failures in turbines can help improve the present failure evaluation methodologies in power plants. Hence, the main objective of this paper is to present the major causes of Kaplan turbine failures to prevent excessive damage to the equipment and provide practical solutions for them. In general, turbines are mainly subjected to both Internal Object Damage (IOD) and Foreign Object Damage (FOD). Accordingly, this paper presents a state-of-the-art review of Kaplan turbine failures related to material and physical defects, deficiencies in design, deficits in manufacturing and assembly processes, corrosion failures, fatigue failure, cavitation wear, types of cavitation in hydro turbines, hydro-abrasive problems, and hydro-erosion problems. Eventually, the authors have attempted to discuss practical hints (e.g., nanostructured coatings) to prevent damages and improve the performance of Kaplan turbines.

show abstract

Section: Practical Solutionsmentioning

confidence: 99%

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

2023

View full text Add to dashboard Cite

show abstract

“…The use of optimization methods based on the genetic algorithms is very helpful in solving complex problems with many parameters, and fortunately this method is constantly being updated [77,78]. Joints, especially welds, are the most sensitive parts that are prone to failure [79][80][81]. In other words, stress concentration, which is a destructive factor in fatigue life, causes the connection, especially tubular joints (TJ), to fail.…”

Section: Reliability and Failure Probabilitymentioning

confidence: 99%

“…This requires extensive research on this subject, and scholars will pay more attention to it. Joints, especially welds, are the most sensitive parts that are prone to failure [79][80][81]. In other words, stress concentration, which is a destructive factor in fatigue life, causes the connection, especially tubular joints (TJ), to fail.…”

mentioning

confidence: 99%

A Comprehensive Review on Design, Monitoring, and Failure in Fixed Offshore Platforms

Amiri

Shaterabadi

Kashyzadeh

et al. 2021

JMSE

View full text Add to dashboard Cite

Offshore platforms have had diverse applications in the marine industry, for example, oil or gas platforms can provide facilities to store the oil and gas before transport those to refineries. Offshore wind turbines are another well-known use of the offshore platform for generating power. As platforms encounter various strong forces from water and wind currents, the materials used for these structures are mainly steel or concrete. These platforms are classified into different types, according to the depth of water and their applications. In addition, offshore platforms, as artificial reefs may be used for decades at different marine conditions. Consequently, their design and maintenance are very important, otherwise, they can cause irreparable damage to the environment. This paper presents the latest and most significant design and monitoring methods, such as the optimal probabilistic seismic demand model, multi-objective optimization, dynamic response assessment, robust fault-tolerant control, etc., under different environmental and geographical conditions. Moreover, the effective factors on the life and failure of these offshore structures are comprehensively introduced to enhance awareness of them, which can be very helpful to improve the design and construction of more reliable and durable structures.

show abstract

“…In a combined structure of bolt connection, due to structural characteristics of the connection, there are often problems such as stress concentration and uneven load distribution of thread teeth. The stress concentration mainly occurs at the thread root, especially at the first thread root, which affects strength and reliability of the bolt, connection to a certain extent (Chen et al, 2010;Farrahi et al, 2018). Xie et al (2020) observed that when a bolted composite structure works in a high temperature environment, fluctuation of temperature and other environmental factors may affect its structural strength and reliability, resulting in bolt loosening and premature fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

Stress and load distribution analysis in bolt connection with modified thread profile under high temperature conditions

He¹,

Zhang²,

Guo³

et al. 2021

Journal of Theoretical and Applied Mechanics

View full text Add to dashboard Cite

In this paper, the load distribution of a bolt connection structure with a variable thread profile at high temperature is investigated. The parameters of time-hardening creep model of aluminum alloy at high temperature were obtained by fitting the uniaxial creep tensile test data of aluminum alloy at 250 • C. Based on ABAQUS, a two-dimensional axisymmetric model of the bolt connection structure was established, and according to the thread load distribution considering linear elasticity, plasticity and creep characteristics, modification of standard metric thread profile was carried out. The load distribution law of the thread of the modified bolt connection structure were investigted. The results show that the load--bearing ratio of the first thread can be significantly reduced and the load-bearing distribution uniformity of all threads can be improved when the modified thread is applied to the bolt connection structure.

show abstract

Failure analysis of bolt connections in fired heater of a petrochemical unit

Cited by 11 publications

References 14 publications

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

A Comprehensive Review on Design, Monitoring, and Failure in Fixed Offshore Platforms

Stress and load distribution analysis in bolt connection with modified thread profile under high temperature conditions

Contact Info

Product

Resources

About