Int. J. of Marine Engineering Innovation and Research, Vol. 1(1), Dec. 2016. 1-5 (ISSN: 2541-5972) 1 Analysis of the Suppression Device as Vortex Induced Vibration (VIV) Reducer on Free Span using Finite Element Method Dwi Priyanta 1 , Anang Abdullah 2 Abstract – subsea pipeline is a transportation infrastructure of oil and gas as an alternative for ship tanker. The uneven topography surface of the sea floor resulting the pipe undergoes free span. The free span is a condition endured by the pipe where the pipe position has distance or gap with the seabed supported by two pivot. The free span is at risk of experiencing a vibration caused by the presence of dynamic load that is current and the wave. The vibration that occurs is the impact of the presence of the phenomenon of Vortex Induced Vibration (VIV). The Phenomenon Of VIV occur on a cylindrical component caused by ocean currents, causing the occurrence of vibration by the movement of fluid on the pipe so that it raises the vortex at the rear of the direction of oncoming flow. One way to dampen or reduce the impact of VIV is by adding suppresion device. VIV suppression device is a tool that is installed on the pipeline on offshore piping installationcthat serves to dampen or reduce the impact of VIV. One of the simulations used to know the characteristics of a fluid is to use (CFD) Computational Fluid Dynamic. With the addition of suppression device can add the rest of the operating time on a free span of affected VIV, on the condition of free span critical exposed VIV (Vortex Induced Vibration value) has a life time on plain pipe 44.21 years, on pipe with 53.09 years and Fairing on the pipe with the Helical strike 52.95 year. Keywords - pipelines, free span, VIV, suppression device,life time. I. INTRODUCTION 1 Subsea pipeline is a transportation infrastructure of oil and gas as an alternative for ship tanker. The uneven topography surface of the sea floor resulting the pipe undergoes free span. Figure 1 illustrates the phenomenon of free span [1]. The free span is a condition endured by the pipe where the pipe position has distance or gap with the seabed supported by two pivot [2]. Moreover the free span is also at risk of experiencing a vibration caused by the presence of dynamic load that is current and the wave. The vibration that occurs is the impact of the the existence of the phenomenon of Vortex Induced Vibration (VIV) [3]. One of the pipeline in Indonesia is the EJGP (East Java Gas Pipeline) which starts from Pulai Pagerungan Great to Gresik 350 Kilometers along the PKG with diameter of 28 inches. (Figure 2). There are three Gas producers Dwi Priyanta is with Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia. E-mail: priyanta@its.ac.id Anang Abdullah is with Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia. use the EJGP to transmit the results of their gas, is KEI (Kangean Energi Indonesia) in Pagerungan and Terang Sirasun Batur, PGN (Santos) on the Maleo MOPU PJU (Petrogas Jatim Utama). Kangean Energi Indonesia send 15 MMscfd from Pagerungan and 250 MMscfd from Terang Sirasun Batur and PGN (Santos) sent 85 MMscfd of gas from Maleo field. Every day approximately 350 MMscfd on distributed using the EJGP [3-4]. Kangen Energy Indonesia uses the EJGP to send gas to the Petro Kimia Gresik and Java Bali Poitrplant (PJB) in the area of Gresik. PGN (Santos) send gas to the customer in Porong Sidoarjo [5]. From the underwater data survey conducted on Maleo Field line to the EJGP 7353 km along on December 25, 2012 up to January 21, 2013 obtained data free span as many as 179 with different characteristics [5]. Figure. 1. Free Span Ilustration