Investigation on scour protection of submarine piggyback pipeline

OCEAN ENGINEERING

卷:182

Article

Yang, Shaopeng¹  Shi, Bing¹  Guo, Yakun²  Yang, Lipeng³ 

[1] Ocean Univ China, Coll Engn, Qingdao 266100, Shandong, Peoples R China

[2] Univ Bradford, Fac Engn & Informat, Bradford BD7 1DP, W Yorkshire, England

[3] Adm Comm Qingdao Dongjiakou Econ Zone, Qingdao 266400, Shandong, Peoples R China

关键词: Piggyback pipeline;    Stead current;    Diameter ratio;    Scour hole;    Scour protection;   

DOI  :  10.1016/j.oceaneng.2019.04.090

来源: Elsevier

【 摘 要 】

This paper presents the results of laboratory experiments and numerical simulations to investigate the effect of different piggyback pipeline configuration on the morphology of local seabed scour subject to steady currents. Piggyback pipeline configuration investigated includes the commonly used piggyback pipeline, namely a small pipe attached on the top of large pipe and new form of piggyback pipeline proposed in this study in which a small pipe is attached to the large pipe on the upstream and downstream side, respectively. Pressure gradient, drag coefficient, lift coefficient and scour extent around pipelines are measured and analyzed for a range of pipelines and current conditions. Results show that the vortex strength downstream of the commonly used piggyback pipeline is larger than that for a single as well as the new piggyback pipeline under the same condition. This new type piggyback pipeline can effectively reduce the depth and width of the scour hole. In particular, when the ratio of the small pipe diameter over the large pipe diameter is greater than 0.3, little scour under this new type piggyback pipeline occurs for the test conditions. The bed topography downstream of the pipe has also been altered to favor the backfill.

【 授权许可】

Free