The effect of excessive penetration of welding on sand erosion pattern due to high speed gas-solid flows in elbows and reducers

Hosseini, Farnaz; Isfahani, Amir Homayoon Meghdadi; Emami, Mohsen Davazdah; Mohseni, Ehsan

doi:10.1016/j.engfailanal.2021.105902

Cited by 9 publications

(2 citation statements)

References 37 publications

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“…One is the mass transfer [17][18][19][20], and the other one is the wall shear stress (WSS). For the former, the non-streamline profile of the weld can destroy the original fluid boundary layer [21,22] and diffusion layer resulting in different driving forces of the mass transfer [23,24]. It is generally considered that the higher the flow velocity, the faster the mass transfer rate and the higher the corrosion rate [11].…”

Section: Introductionmentioning

confidence: 99%

“…Tomarov et al [23] found that local erosion-corrosion was the dominant mechanism causing thinning of the welded connections in the pipelines of a power unit at a nuclear power station. Hosseini et al [24] investigated the effect of excessive penetration of welding on the sand erosion of elbows and reducers. They showed that the erosion rate increased by increasing excessive penetration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Local Fluid Disturbance Induced by Weld Reinforcement Height on the Corrosion of a Low Alloy Steel Weld

Zheng

Wang

et al. 2023

Metals

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Weld corrosion exists widely in the petrochemical industry and attracts great attention. Most research proves that weld corrosion originates from the material factors introduced during the welding process. However, it is noted that local fluid turbulence due to the weld reinforcement height (WRH) plays an important role in the non-uniform corrosion of welds in flowing media. Accordingly, the individual effect of the local flow on the weld corrosion of low alloy steel was analyzed by experiments and simulation in this study. Electrochemical measurements and morphology observation were conducted, combined with flow field analyses. The results showed that local fluid turbulence due to WRH affected the non-uniform corrosion of low alloy steel welds. The upstream surface and the backflow surface had the highest and lowest corrosion rates, respectively. Interestingly, the high flow velocity surface region did not have a high-corrosion rate. This is due to the combined effects of mass transfer, charge transfer, and wall shear stress. The pitting corrosion was also discussed in view of the aspects above.

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