A Case Study: Corrosion Failure of Tube Heat Exchanger

Ghayad, Ibrahim M.; Hamid, Z. Abdel; Gomaa, Nasser

doi:10.14355/me.2015.04.007

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…Current-time curves recorded for the Cu-Ni alloys revealed that decreases both pitting and general corrosion. 4. Electrochemical impedance spectroscopy confirmed the polarization and current-time, where the surface and polarization resistances recorded higher values in NaCl, which indicates that Cu-10 Ni alloy, is more corrosive than Cu-30 Ni alloy.…”

Section: Discussionmentioning

confidence: 64%

“…So, corrosion is expected to occur on the side of the heat exchange tubes which the water contains quite hights chloride levels which are due to the use of desalinated water [4]. Studies were perfect in chloride [5,6], in either natural or synthetic sea water, in the absence or presence of sulfide to understand the corrosion mechanism under different conditions.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of electrochemical Corrosion of Novel Designs of 90/10 and 70/30 Copper-Nickel Alloys in Brine Solutions

Hussein

Ahmed

2019

Egypt. J. Chem.

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C OPPER-NICKEL alloy is a material of choice for condensers and heat exchangers, where seawater is used as a coolant and in desalination plants. In this work, we survey the comparative corroding behavior of novel designs of 90/10 and 70/30 Copper-Nickel alloys under higher salinity (3.5 wt%, 10 wt% and 15 wt% NaCl). The electrochemical corrosion of Cu-Ni alloys in brine solutions was studied using potentiodynamic polarization, chronoamperometric and electrochemical impedance spectroscopy measurements along with scanning electron microscope (SEM) and energy dispersive X-Ray analyzer (EDX) investigations. Polarization data showed that Cu-10 Ni alloy is more corrosive than Cu-30 Ni alloy in 3.5 wt% NaCl solutions. Chronoamperometric curves confirmed the results obtained by polarization measurements that the uniform and pitting corrosion of Cu-Ni alloy were reduced in the Cu-30 Ni alloy in 3.5wt% NaCl solutions. Impedance spectra revealed that the surface and polarization resistances recorded higher values in Cu-30Ni alloy. SEM/EDX investigations indicated that the corrosion of Cu-Ni alloys proceeded by the selective electro-dissolution of nickel, which allowed copper enrichment on the surface of the alloy. The heat exchanger served to heat desalinated water, the water had a high chloride level. Corrosion examination indicated susceptibility towards pitting corrosion, especially at high temperature.

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Section: Discussionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Comparative study of electrochemical Corrosion of Novel Designs of 90/10 and 70/30 Copper-Nickel Alloys in Brine Solutions

Hussein

Ahmed

2019

Egypt. J. Chem.

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“…Additional examples of failure analyses of shell-andtube heat exchangers where pitting was one of the main modes of corrosion-related failure can be found in the following references: Xie et al (2015), Ghayad et al (2015), Qiankun et al (2017), Sanders and Iwand (2013), Ifezue and Tobins (2015), Zheng et al (2014), Song et al (2013), and Abouswa et al (2007). Two papers in which pitting corrosion in plate heat exchangers was observed are described by Crum et al (2007) and Turissini et al (1997).…”

Section: Pitting Corrosionmentioning

confidence: 99%

Corrosion and corrosion prevention in heat exchangers

et al. 2019

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In many industries and processes, heat exchangers are of vital importance as they are used to transfer heat from one fluid to another. These fluids can be corrosive to heat exchangers, which are usually made of metallic materials. This paper illustrates that corrosion is an important problem in the operation of heat exchangers in many environments, for which no straightforward answer exists. Corrosion failures of heat exchangers are common, and corrosion often involves high maintenance or repair costs. In this review, an overview is given of what is known on corrosion in heat exchangers. The different types of corrosion encountered in heat exchangers and the susceptible places in the devices are discussed first. This is combined with an overview of failure analyses for each type of corrosion. Next, the effect of heat transfer on corrosion and the influence of corrosion on the thermohydraulic performances are discussed. Finally, the prevention and control of corrosion is tackled. Prevention goes from general design considerations and operation guidelines to the use of cathodic and anodic protection.

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“…When a temperature difference occurs, energy is transferred in heat, which can either be sensible heat or latent heat in thermal energy storage, which utilizes the latent heat of phase-change materials. Shell and tube heat exchangers are most frequently employed in industrial cooling systems, water power plants, nuclear power plants, lubrication oil coolers, and petrochemical and oil industries (Ghayad et al, 2015;Fathi and Mussa, 2021). Numerous earlier attempts have Increasing the efficiency of heat exchangers has received more attention from researchers.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Heat Transfer Enhancement in a Double Pipe Heat Exchanger Using Compound Technique of Transverse Vibration and Inclination Angle

Lafta¹,

Mohammed²

2023

jcoeng

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Numerous tests are recently conducted to assess vibration's role in accelerating the heat transfer rate in various heat exchangers. In this work, the enhancement of heat transfer by the effect of transfer vibration and inclination angles on the surface of a double pipe heat exchanger experimentally has been investigated. A data acquisition system is applied to record the data of temperatures, flow rates, and frequencies over the tests. A compound technique was adopted, including the application of a set of inclination angles of (0°, 10°, 20°, and 30°) under the effect of frequency of vibration ranging from sub-resonance to over-resonance frequencies. The results showed that the overall heat transfer coefficient enhances by applying the compound technique at all the working fluid's temperatures and flow rate ranges. The maximum increase in overall heat transfer coefficient occurs at an angle of 30° and the resonance frequency. Moreover, the effectiveness of the double pipe heat exchanger gradually expanded when temperature, inclination angles, and vibration amplitude rosed. But the effectiveness value declined as the hot working flow rate increased considerably. Finally, the enhancement factor demonstrated that the combined strategy (vibration frequencies and inclination angles) had been the most effective technique in improving and enhancing heat transfer and was superior to the other ways. Additionally, the extremes improvement in overall heat transfer coefficient, effectiveness, and enhancement factor are 183.4, 191, and 164.4 %. The improvement was situated at the resonance frequency with a 30° inclination angle.

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A Case Study: Corrosion Failure of Tube Heat Exchanger

Cited by 8 publications

References 6 publications

Comparative study of electrochemical Corrosion of Novel Designs of 90/10 and 70/30 Copper-Nickel Alloys in Brine Solutions

Comparative study of electrochemical Corrosion of Novel Designs of 90/10 and 70/30 Copper-Nickel Alloys in Brine Solutions

Corrosion and corrosion prevention in heat exchangers

Experimental Investigation of Heat Transfer Enhancement in a Double Pipe Heat Exchanger Using Compound Technique of Transverse Vibration and Inclination Angle

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