Abstract

Mohamed N. El-Shaib
Computerized Stability Assessment of Submarine Pipelines
An offshore pipeline has to be stable on the seabed, if it is too light, it will slide away under the forces due to waves and current. On the other hand, it should not be too heavy, otherwise it will be difficult to construct and unnecessarily expensive. The aim of the work is to present a new user friendly computer program (CSOP) to examine the stability of the pipe lines on the seabed. First, this thesis focuses on the researches that were carried out particularly on solving this problem. Then, it shows the steps used in design analysis and the two acceptable methods in the industry for determining the stability of un-trenched submarine pipelines resting on the sea bed. The first method is the DNV recommended practice (RP-305) presented in non-dimensional curves. The second method. Was developed by the American Gas Association and the Pipeline Research Council International, this method is programmed in AGA/PRCI pipeline stability computer program. However, this method is considered to be expensive. A comparison of weight coating calculations using the three design methods, DNV recommended practice, the AGA/PRCI pipeline stability program and (CSOP) program. Case studies will be performed and the results will be analyzed to examine the agreement between the proposed method and the AGA/PRCI method.