Investigation on Time of Scour Depth Below the Pipeline with Spoiler and piggyback line Under Steady Current

Abbas Ebrahimi¹ Azam Ronaghi² Mojtaba Damroudi³ Behzad Behzadi fard⁴

1) Head of Basic Water Resources Studies Management, North Khorasan Regional Water Company, Bojnourd, Iran,
2) Head of Water Resources Studies Group , North Khorasan Regional Water Company, Bojnourd, Iran,
3) Director of Design Department consulting engineering of haft pargar sayal jam, Bojnourd, Iran,
4) Director of Project Management Office (PMO) at haft pargar sayal jam consulting engineering, Bojnourd, Iran,

Publication : 3rd International Congress On Engineering, Technology and Innovation(eticong.com/3rd)
Abstract :
Changes in the external geometry of the pipeline laid on the erodible beds may affect the local scour around pipe. In this study, the effect of changes in the external geometry of the pipe duo to attached spoiler and piggyback line on the main pipe under unidirectional flow on the erodible bed is investigated. The results showed, At the angles of 180, 135 and 225°, the Spoiler and piggyback reduced the time scale of scouring process but increased the scour depths. At angles of 90 and 270°, the scale time of scour processes are increased. It can be concluded that the performance of piggyback is similar to the spoiler, therefore, they are of similar application and could be a suitable alternative for the spoiler
Keywords : Local Scour Pipeline Spoiler Piggyback line River offshore