Pipeline inspection gauges (PIGs), as a kind of pipeline robot, are very efficient tools for cleaning and inspecting pipelines. However, the occurrence obstructions in PIGs has always been problem. The main cause PIG clogging problem is reduced pressure differential between front rear due to damage cup. In this paper, rigid-flexible coupled multibody dynamic motion system established by importi...

The air-water two-phase flow plays an important role in many applications of industry fields. Usually, a 90-degree bend is used to connect pipes for changing the direction which influences pattern. In this paper, effect under different ranges gas and liquid superficial velocities on patterns horizontal pipe located after was experimentally investigated, then results were presented compared patt...

In Oil & Gas industry, the high internal sound pressure levels in pipe lines often cause significant structural vibrations. Quantification of acoustic pressures is therefore an important step understanding global fluid–structure behaviour such systems. However, direct measurements are not possible since they generally require intrusive access to interior. this paper inverse procedure proposed i...

Aim of this paper is to protect a transmission line section/feeder from internal faults by means of differential protection through a microprocessor. The conventional differential relay operates on the circulating current principle, which involves a direct comparison of the magnitude and phase of the currents entering and leaving the protected equipment or line section. The present scheme is ba...

Studies at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, are being conducted to evaluate nondestructive examinations (NDE) coupled with mechanical testing of butt fusion joints in high-density polyethylene (HDPE) pipe for assessing lack of fusion. The work provides information to the Nuclear Regulatory Commission (NRC) on the effectiveness of volumetric inspection te...

Structural components are subjected to variable thermomechanical loads during use. These can lead fatigue failure therefore it is important detect potential weak points in the structure already early stages of R&D process. Reliable results stress-strain response crucial importance structural analyses. In this paper, a metallic pipe bend load and its investigated. The reach beyond yield stress m...