Failure analysis of pipes used in a hydrodesulfuration system of a petrochemical plant

Tungsten inert gas welding is one of the established joining processes for stainless steel. But hitherto very little has been reported on induced residual stresses in circular thin pipe joints during tungsten inert gas welding of SS 304. This paper reports the effect of welding parameters such as welding speed, welding current and shielding gas flow rate of tungsten inert gas welding on micro-hardness, width of the heat-affected zone, residual stresses and microstructural properties of SS 304 thin pipe joints. The results indicate that the welding current and the welding speed have a significant effect on micro-hardness of weld bead and width of the heat-affected zone. Further changes in the microstructure of the joints were studied in terms of dendrite formation. It has been observed that there is proportional increase in depth/width of the heat-affected zone with the heat input during the joining process, resulting in a decrease of micro-hardness. The results are also supported by radiographic analysis and X-ray diffraction data to understand the nature of residual stresses which was observed as compressive at the weld bead and tensile along the axis of thin welded pipe joints. Finally, the process capability analysis based on Cp and Cpk values of ≥1 suggests that the process can be gainfully used for mass production.

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“…Hereby, welding current is 60-90 A and welding speed is 2-3 mm/s. The welding heat input was calculated as follows 14 Welding heat input(kJ=mm)…”

Section: Welding Processmentioning

confidence: 99%

On mechanical and morphological investigations of tungsten inert gas welded SS 304 thin pipe joints

Arora

Singh

Brar

2020

Measurement and Control

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“…Hydrogen-induced cracking (HIC), sulfide-stress cracking (SSC), stress-oriented hydrogeninduced cracking (SOHIC) or stress corrosion cracking (SCC), are highly important issues in oil and gas transmission pipelines used in petroleum industries, because always the leakage, rupture and failure of the pipelines can pose a potential threat to humans and environment [21][22][23][24][25][26]. Thus, corrosion and defects detection of pipelines is essential.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical investigations and corrosion behavior of failed weld joint in AISI 1518 low carbon steel pipeline

Shirinzadeh-Dastgiri

Mohammadi

Behnamian

et al. 2015

Engineering Failure Analysis

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“…Forensic engineering can be considered as a failure analysis for the investigation of materials, structures and products which can cause the loss of property and personal injuries. The main goal of this field is to identify the sequence of events leading to fatal failure in terms of the law of product liability 1–4 . Unfortunately, most of the products’ failures and corresponding case studies are not easily accessible in academic literature since manufacturers try not to publicize the drawbacks of their products.…”

Section: Introductionmentioning

confidence: 99%

“…E-mail: schoi@me.gatech.edu of the law of product liability. [1][2][3][4] Unfortunately, most of the products' failures and corresponding case studies are not easily accessible in academic literature since manufacturers try not to publicize the drawbacks of their products. However, it is critical to share the previous experiences or case studies in order to prevent similar accidents and to improve the current designs.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of connecting bolts in collapsed tower crane

Kim

Choi

2012

Fatigue Fract Eng Mat Struct

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The use of tower cranes can cause critical accidents during large building construction projects. Failure of the tower crane results in critical injuries to crane operators and other workers at the construction site. Issues that often cause the fatal collapse of tower cranes include the damage and fracture of the mast (or tower) and turntable parts, and the tower crane slewing‐unit‐support fleeing. Without systematic investigations and proper prevention procedures in place, this type of crane accident, which often leads to worker fatalities, will continue to occur. Therefore, more proactive, specialized and systematic research needs to be performed in terms of forensic engineering to minimize the occurrence of similar disasters. In this research, the tower crane collapse accidents are thoroughly investigated and the exact cause of the damaged crane parts is also identified using fractography and mechanical/chemical characterizations techniques, including visual inspections, field research, scanning electron microscopes and optical microscopes. Specifically, instrumented indentation technique is employed to evaluate the material properties, and energy spectrum analysis is used to determine the chemical characteristics. Based on thorough investigations, it has been identified that the connecting bolts of the tower crane are very vulnerable. It is recommended to improve the reliability of the bolts and to implement additional regulations to check their maintenance and safety. This research clearly provides guidance for investigating crane collapse accidents and contributes to the prevention of similar types of accidents. Several corrective actions and recommendations are suggested to reduce the risk of the tower crane failures.

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Failure analysis of pipes used in a hydrodesulfuration system of a petrochemical plant

Cited by 17 publications

References 4 publications

On mechanical and morphological investigations of tungsten inert gas welded SS 304 thin pipe joints

On mechanical and morphological investigations of tungsten inert gas welded SS 304 thin pipe joints

Metallurgical investigations and corrosion behavior of failed weld joint in AISI 1518 low carbon steel pipeline

Failure analysis of connecting bolts in collapsed tower crane

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