Corrosion failure of superheat steam pipes of an ammonia production plant

Sabouri, M.; Hoseiny, Hamed; Faridi, H.R.

doi:10.1016/j.vacuum.2015.07.022

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…The CTEs of GaPO4 is a second-rank tensor with only two independent coefficients and . The temperature coefficients for CTEs and elastic properties were used to compute their respective HT values for the model using Equation (8). The HT material properties are presented in Figure 5.…”

Section: Modelling Of the Gapo 4 Transducermentioning

confidence: 99%

“…The HT dimensions were calculated by applying Equation (8), and the density at each temperature was calculated using Equations (10). Each of these properties was calculated at several temperatures, and their temperature coefficients were found using curve fitting and the relation defined in Equation (8). The properties and their temperature coefficients were averaged for five samples.…”

Section: Electromechanical Impedance Characterisationmentioning

confidence: 99%

“…The TS-mode coefficients were derived from the EMI measurements using Equations (6)- (8). The calculated coefficients were compared with those reported in the literature, and the relative errors are listed in Table 2.…”

Section: Ts-mode Coefficients Of Gapo4mentioning

confidence: 99%

“…HTPs are operating at extreme temperatures up to around 600 • C [6], high pressures and subjected to continuous cyclic loadings. This can lead to the development of creep-fatigue- [7], corrosion- [8] and stress corrosion cracking-type [9] defects. Currently, they undergo periodic inspections during maintenance outages, but new technologies are being sought after for in situ monitoring and early warnings of material degradation [10].…”

Section: Introductionmentioning

confidence: 99%

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Development of Ultrasonic Guided Wave Transducer for Monitoring of High Temperature Pipelines

Dhutti

Tumin

Balachandran

et al. 2019

Sensors

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High-temperature (HT) ultrasonic transducers are of increasing interest for structural health monitoring (SHM) of structures operating in harsh environments. This article focuses on the development of an HT piezoelectric wafer active sensor (HT-PWAS) for SHM of HT pipelines using ultrasonic guided waves. The PWAS was fabricated using Y-cut gallium phosphate (GaPO4) to produce a torsional guided wave mode on pipes operating at temperatures up to 600 °C. A number of confidence-building tests on the PWAS were carried out. HT electromechanical impedance (EMI) spectroscopy was performed to characterise piezoelectric properties at elevated temperatures and over long periods of time (>1000 h). Laser Doppler vibrometry (LDV) was used to verify the modes of vibration. A finite element model of GaPO4 PWAS was developed to model the electromechanical behaviour of the PWAS and the effect of increasing temperatures, and it was validated using EMI and LDV experimental data. This study demonstrates the application of GaPO4 for guided-wave SHM of pipelines and presents a model that can be used to evaluate different transducer designs for HT applications.

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Section: Modelling Of the Gapo 4 Transducermentioning

confidence: 99%

Section: Electromechanical Impedance Characterisationmentioning

confidence: 99%

Section: Ts-mode Coefficients Of Gapo4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Ultrasonic Guided Wave Transducer for Monitoring of High Temperature Pipelines

Dhutti

Tumin

Balachandran

et al. 2019

Sensors

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show abstract

“…At present, the majority of TPPs have an average operating age of over 30 years and HTP failure is listed among the major causes of ageing TPP outages. HTPs suffer continuous cyclic loading and extreme temperature and pressures, and are known to develop defects through a range of mechanisms-creep, fatigue [2], creep-fatigue [3] and thermal fatigue [4], and corrosion [5]. Root-cause analyses of super-heated boiler-tube failure [6] indicate thermal shock and differential thermal expansion are also responsible for defect development.…”

Section: Introductionmentioning

confidence: 99%

Pipeline Health Monitoring to Optimise Plant Efficiency

Dhutti¹,

Gan²

2019

Power Plants in the Industry

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This chapter presents technological innovations that support asset integrity management-a crucial activity for optimising plant efficiency. In ageing thermal and geothermal power plants, critical assets such as steam piping are subject to high pressures and temperatures that accelerate damage mechanisms. Traditionally, the critical locations of these assets undergo routine inspection which is both costly and time consuming and affects the plant reliability and energy availability. There is an increasing trend in the application of non-destructive testing (NDT) and information technologies to in-service monitoring of these assets. The aim of this chapter is to provide a comprehensive overview of the state-of-the-art monitoring technologies for steamlines, with a focus on high temperature ultrasonic guided wave techniques. The enabling technologies, which include high temperature sensors, diagnostic data analysis algorithms and their monitoring performances, are reviewed. These technological advancements enable inspection without interruption of plant operations, and provide diagnosis and prognosis data for condition-based maintenance, increasing plant safety and its operational efficiency.

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Passive Layer Stability of 2205 Duplex Stainless Steel in Oilfield-Produced Water: Potentiostatic Critical Pitting Temperature Test and Wavelet Analysis

Sabouri¹,

Hoseiny²

2017

Metall Mater Trans B

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Corrosion failure of superheat steam pipes of an ammonia production plant

Cited by 5 publications

References 12 publications

Development of Ultrasonic Guided Wave Transducer for Monitoring of High Temperature Pipelines

Development of Ultrasonic Guided Wave Transducer for Monitoring of High Temperature Pipelines

Pipeline Health Monitoring to Optimise Plant Efficiency

Passive Layer Stability of 2205 Duplex Stainless Steel in Oilfield-Produced Water: Potentiostatic Critical Pitting Temperature Test and Wavelet Analysis

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