ABSTRACT

The objective of this research is to design an air chamber that can encompass a submarine pipeline while replacing the water inside with air, thereby creating an air environment underwater. This chamber enables easy implementation of 3D scanning, repair, and welding technologies, which is crucial for enhancing the pipeline's longevity. A simulation approach is developed to forecast the tensile strain limit for a hexagonal prism pressure chamber underwater, which includes optimizing the pressure resistance and stability of the chamber under both water and air states. Furthermore, this research introduces a novel method for dynamically balancing gravity and buoyancy.

INTRODUCTION

Given the escalating global demand for energy, safety incidents resulting from the corrosion and wear of submarine pipelines have become a pressing concern. Consequently, pipeline detection has become a vital area of focus. Presently, underwater pipeline detection comprises two distinct aspects, namely, internal and external inspections. Internal inspection primarily involves assessing the internal conditions and identifying any existing defects within the pipeline. This process enables the collection of relevant data regarding internal corrosion, cracks, and other defects, thereby facilitating the calculation of the defect corrosion growth rate, evaluation of the residual strength of the pipeline, and prediction of the second inspection cycle. On the other hand, external detection is conducted outside the pipeline to evaluate its external condition and to identify any external force or wall damage. This is especially crucial for pipelines that have suffered severe mechanical damage due to natural calamities such as earthquakes or typhoons during operation. External inspection technology, therefore, represents the most critical means of comprehending the operational status of underwater pipelines that cannot undergo internal inspections, and detecting pipeline defects. By conducting internal and external inspections of pipelines, it is possible to obtain timely and pertinent pipeline information, as well as accurately assess the condition of the pipelines.

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