Fluid velocity has the potential to cause severe erosion damage to oil & gas production infrastructure. In order to avoid or alleviate damage due to erosion, the American Petroleum Institute Recommended Practice (API RP) 14E recommends a threshold fluid velocity for production tubing and pipelines. However, field and laboratory data have proven that the applied empirical constants, known as C-f...

number of NDE applications. To excite Lamb waves, Ultrasonic Lamb wave techniques are widely used in a mode conversion of bulk waves or photo acoustic excitation are often used. Both of these approaches suffer from the need for liquid couplant or ablation of materials to reach good signal to noise ratio. In this paper, we propose a novel technique that utilizes point source excitation and detec...

Hydrogen corrosion of main gas and oil pipelines often leads to accidents. It is necessary assess the life hydrogen-weakened pipes. An inner layer with deteriorated mechanical characteristics formed in them under pressure hydrogen-containing medium. In paper calculation free vibrations such a tube taking into account degradation its material performed. The modeled as bilayer cylindrical shell a...

The structural response and failure mechanisms of 35 used concrete sewer pipes are investigated by means a combined experimental–numerical approach, whereby specific attention focuses on determining the effect biochemical attack. Accordingly, degree degradation inner outer surfaces is carefully analysed visual inspection, subsequently categorized in 6 different surface condition classes. type a...