ABSTRACT

The paper describes the design considerations and construction engineering of a bundled submarine pipeline for a curved route as based on the completed pipeline prOject in May 1999 in Dang-jin, Korea. The pipeline consists of two 30" gas lines with 17.5 mm wall thickness and 70 nun weight coating. In the 3,007 m entire offshore mute, around 1,000 m was curved with 1,400 m radius. The maximum water depth reaches up to 34 meter from mean sea water level. The conslruction area is characterized with 7.5 meter tidal range with more than 4 knots current. The horizontal stability against strong current was gained in the trench, however the vertical stability was secured with specially engineered buoy tanks. To advance through the curved mute, 18 subsea guide milers were designed and installed at various spaces which satisfied the allowable stress of pipeline. The location of subsea piles were decided with FEM analysis. The reaction force for each pile from the analysis was applied in the design of subsea piles. Detailed investigations on the subsea pile space and quantity were conducted in the engineering phase. The diameter and penetration depth of each pile were carefully designed. The engineering and design of bundled pipelines with key aspects on curved section are discussed with the applied installation method.

INTRODUCTION

Since the first bundled pipeline installation by bottom pull took plat in Singapore in 1981, there have been a number of single and bundled pipelines installed by bottom pull technique in Asian region. (Ngiarn and etc. 1998) As the oil and gas import and oil products expert increase there are number of pipelines are constructed recently in the region. (Jo, 1999)

This content is only available via PDF.
You can access this article if you purchase or spend a download.