The fluid-conveying pipe is a fundamental dynamical problem in the field of fluid– structure interactions. In recent years considerable attention has been given to the lateral vibrations of pipes containing by a moving fluid. In this paper, the vibration analysis of composite natural gas pipeline in the thermal and humidity environment is studied. The effect of the non-uniform magnetic field is...

To compare the effect of various pipe materials on biofilm formation, surface water was used as the test water source; plastic-based pipe materials (polyvinyl chloride-PVC, unplasticised polyvinyl chloride-UPVC, medium density polyethylene-MDPE) and cement-based pipe materials (cement and asbestos cement) are commonly used in drinking water distribution systems in South Africa as test pipe mate...

Virtual prototype of pipe wagon articulating (PWA) system has been developed and simulated based on the kinematics and dynamics of machinery and Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software. It has been integrated with real-time three dimensional (3-D) system simulations for detailed and responsive interaction with dynamic virtual environments. By using this virtual model, ...

This paper discusses the accuracy of a finite element model of a coupled piping system subjected to earthquake loads, as well as the differences in seismic behavior between coupled and welded piping system models. The test setup of a Victaulic coupled piping system tested at Lehigh University was modeled and analyzed with finite element methods. Two models were developed: (1) a welded pipe mode...

The aim of this paper is to present a kinetic numerical scheme for the computations of transient pressurised flows in closed water pipe with non uniform sections. Firstly, we detail the derivation of the mathematical model in curvilinear coordinates and we performe a formal asymptotic analysis. The obtained system is written as a conservative hyperbolic partial differential system of equations....

MFL (Magnetic Flux Leakage) inspection is one of the most commonly used methods for detecting corrosion defects in pipelines. Normally, an MFL system is divided into three parts: in-pipe inspector, out-of-pipe locating system and data analyzing system, and AGM (Above Ground Marker) is a crucial device to locate the corrosion. With the fact that most currently existing AGM devices lack flexibili...

A new model for the design of the city gas distribution network has been presented. On the basis of mass flow rates and pressure balances a nonlinear system of equation is obtained. A method for solving the latter is outlined which gives accurate results. Also, this method, when compared to the other accessible ones, takes less computer time. Finally in this method the actual length of netw...

As a result of the progressive implantation of the Industry 4.0 paradigm, many industries are experimenting a revolution that shipyards cannot ignore. Therefore, the application of the principles of Industry 4.0 to shipyards are leading to the creation of Shipyards 4.0. Due to this, Navantia, one of the 10 largest shipbuilders in the world, is updating its whole inner workings to keep up with t...

This paper addresses the problem of navigation of an autonomous robot when it moves in a modern concrete sewer. The robot must keep its orientation within mostly cylindrical sewer pipes. This implies a geometrical constraint on the environment in which the robot operates. We present a hybrid vision system that consists of (a) an optical camera and (b) a laser crosshair projector generating a cr...

In this paper, we describe the vision system for the DeWaLoP (Developing Water Loss Prevention) robot. The robot working environment is inside a pipe (a cylinder), which fits perfectly to the vision system, based on omni-directional cameras. By unrolling the omni-directional camera image to a panoramic image, the circular features of the pipe become linear and by adding a line tracking algorith...