Abstract
Composite pipeline can drastically reduce losses caused by corrosion that occurs in carbon steel pipes in the industry. Multiple numerical testing has been conducted to determine maximum stress and strain a Reinforced Thermoplastic Pipe (RTP) can withstand before hitting failure. Not many studies were done to find the maximum stress intensity a defected RTP can resist before failing. Objectives are to validate the numerical model for Reinforced Thermoplastic Pipeline (RTP) to industry standard and to analyze the maximum stress intensity of Reinforced Thermoplastic Pipes (RTP) can withstand with various size of defects under constant pressure and incremental internal pressure with constant crack defect. Results were, under constant internal pressure of 6 MPa, the pipe will fail with a defect length of 2.05mm and at constant design pressure of 10 MPa, the pipe will fail with a defect length of 0.3mm. At constant crack depth and width, crack tip propagation (failure) is more dependent on internal pressure rather than crack length. However, when comparing the severity of crack depth to internal pressure, crack depth is the major cause of failure.
Highlights
Background of studyThe oil and gas companies are suffering major losses from carbon manufactured type of pipelines due corrosion that occurs internally and externally
The controlled Reinforced Thermoplastic Pipe (RTP) was able to meet industry specifications of the ultimate yield strength being under 40 MPa
This research has shown that the inner section of the High density polyethylene (HDPE) suffers higher stress intensity (MPa mm0.5) compared to the outer HDPE because the primary loading is from the internal direction like the research done by [5]
Summary
The oil and gas companies are suffering major losses from carbon manufactured type of pipelines due corrosion that occurs internally and externally. A company, which is based in the Netherlands, says that an estimated 50% of leakage issues are caused by corrosion [1]. The main cause of corrosion is because of the presence of sea water and the fluid or gas that is transported using the inner liner of the pipe. Studies that were done shows that the cost of corrosion is estimated to be USD0.40 for each barrel produced and an estimate amount of USD1.4billion is annually attributed to corrosion in the US oil and gas industry [2]. Another study done by [3] states that 50% of all pipeline cost are always related to corrosion.
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