Abstract
This research aims to build a finite element model of oil or gas steel pipelines transmission. The model has been developed in that crack propagation in pipes can be reduced as possible to avoid the failure. The suggestion that is taken into consideration for this purposeis to stopping crack propagation as possibly, is by using ribs as arresters. Different thicknesses have been tested for the ribs used in this study. The first one was of 0.02 m, while as the second thickness was of 0.05 m. The dimensions of pipe are of 0.01 m thickness, and diameter of 0.5 m. The model of pipe consists of three parts. The first part has two different lengths 2 m and 3 m. The second, which is the rib, is of length of 0.15 m. The third part of pipe has the length of 1 m. So all the three parts are made up the case study that was studied in this work. The value of stress intensity factor K1 for different lengths of cracks has been calculated by the finite element model deve-loped by using ANSYS package. These calculations were applied with and without ribs. The results showed that when using the ribs, the stress intensity factor would be reduced significantly. This leads to reduce the possibility of failure.
Highlights
Natural gas and petroleum transmission pipeline system is one of the most important infrastructures and is considered as economic and safe way, that is used worldwide efficiently of transporting a large volume of natural gas or crude oil over a long distance [1,2,3]
Dynamic analysis relating to rapid crack propagation (RCP) and arrest in gas pipelines were considered by [8], based on a fluid/structure/fracture interaction package, PFRAC to simulate the behavior of the fractured pipes
The use of steel rings as crack arrestor devices in steel gas transmission pipelines is to prevent the possibility of long running axial cracks wasdone by [10]
Summary
Natural gas and petroleum transmission pipeline system is one of the most important infrastructures and is considered as economic and safe way, that is used worldwide efficiently of transporting a large volume of natural gas or crude oil over a long distance [1,2,3]. In this study the efficiency of the numerical-analytic approach to the evaluation of the kinetics and changes in the shapes of corrosion fatigue defects in the course of their propagation in the wall of the pipeline was experimentally demonstrated They determined the conditions under which the catastrophic failures of pipes become possible after long-operation. 3. Opportunity to use ribs for crack arrest The rib method has suggested to use for stopping or reducing possibility of the failure of long crack propagation in oil or gas pipelines. Opportunity to use ribs for crack arrest The rib method has suggested to use for stopping or reducing possibility of the failure of long crack propagation in oil or gas pipelines For this purpose FEM (Finite element method) is used. In other words it can be used ribs with long distances of each other
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