Hammer impact test applied for fouling detection in pipelines

Abstract

RESUMOTeste de Impacto do Martelo aplicado na Deteccão de Incrustação em Tubulações A detecção da incrustação em sistemas de dutosé um problema persistente e requer uma demanda pertinente para as indústrias químicas, petrolíferas, alimentícias e farmacêuticas. A incrustaçãoé um processo de deposicão de materiais sólidos dissolvidos orgânicos e outros materiais pesados nos fluidos transportados ou em suspensão sobre as superfícies das paredes internas em sistemas de transporte de fluidos. Este trabalho apresenta resultados da pesquisa de excitação do teste do martelo para análise de vibrações utilizando testes não-invasivos para detecção de incrustação em tubulações. Dados da vibração foram analizados na presença de uma camada de incrustação no interior dos tubos usando um acelerometro e um microfone para detecção. Com a aná-lise dos resultados obtidosé possível detectar o processo de incrustação, nas tubulações monitoradas, com e sem condições de carga, utilizando um microfone e um acelerômetro como sensores. ABSTRACTThe fouling detection in duct systems is a persistent problem and remains a relevant demand for the chemical, oil, food and pharmaceutical industries. The fouling is a deposition process of heavy organic and other dissolved solid materials in the transported fluids or suspensions onto inner wall surfaces in fluid transport systems. This work presents research results of hammer test for vibration analysis using non-invasive tests to fouling detection in pipelines. Data were taken from the vibration in presence of an inner pipe fouling layer using an accelerometer and a microphone for detection. With the analysis of the obtained results is possible to detect the fouling process, in the monitored pipelines, with and without load conditions, using a microphone and an accelerometer as sensors.

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

“…The relationship between pipe thickness and the natural frequency evaluated using experimental values, theory, and FEM analysis is shown in Figure 6. The red lines are theoretical values obtained from Equation (9). The black markers are values obtained from finite-element simulations, the settings of which are given in Section 4.1.…”

“…However, the leakage field is small, and the inspection target (piping) requires magnetization with a permanent magnet or yoke, and that requirement makes the inspection equipment larger. Another method for inspecting piping is the hammer test (HT), in which the pipe is struck directly, and the resulting vibration is analyzed [ 9 , 10 ]. The HT has a relatively low resolution, but it is speedy and simple.…”

Impact of Fouling on Flow-Induced Vibration Characteristics in Fluid-Conveying Pipelines

“…Silva [7], [8] presented preliminary research results of vibrational hammer excitation for easy to use external noninvasive, non-destructive fouling detection in pipelines. The proposed method could detect the inner pipe layer formation, and thickness estimation of the adsorbed material.…”