[01] Felippe Thurler Schimidt, Electrical Engineering Department, Fluminense Federal University, Niterói, Brazil. [02] Marcio Zamboti Fortes, Electrical Engineering Department, Fluminense Federal University, Niterói, Brazil.

In offshore operations, the installation of flexible lines and umbilicals in producing wells at high water depths is a critical step, since these lines and the installation vessel are subjected to high loads during this operation. As a result, the installation operation must be studied and evaluated before its viability can be determined according to the characteristics of the field and the characteristics of a particular installation ship. During the installation, a series of hydrostatic, pneumatic, and electrical tests need to be made on the installation ship in order to validate and condition the flexible line and umbilical to be used in the offshore field. The main objective of this paper is to present the most common operational failures that occur during installation of flexible and umbilical lines and, the consequences of the damage caused by these failures to the components. These critical failures are explained to determine whether they could cause lose in components functionality in the offshore field and if these failures can cause injury to the workers. The more critical operating faults during the loading, handling, and installation are described and a brief description of each of these failures is presented. The result of this article is a text with illustrations that can serve as a query to interest in the issues related to installations engineering.

Maintenance, Security, Risk Assessment

[01] Bai Y, Lu Y, Cheng P. Analytical prediction of umbilical behavior under combined tension and internal pressure. Ocean Eng 2015; 109: 135-144. doi: 10.1016/ j.oceaneng.2015.08.067. [02] Zhao Y, Liu H. Numerical implementation of the installation/mooring line and application to analyzing comprehensive anchor behaviors. Applied Ocean Research 2016; 54: 101-104. doi: 10.1016/j.apor.2015.10.007. [03] Liu H, Liu C, Zhao Y, Wang C. Reverse catenary equation of the embedded installation line and application to the kinematic model for drag anchors. Applied Ocean Research 2013; 43: 80-87. doi: 10.1016/j.apor.2013.08.002. [04] Shiri H. Response of Steel catenary risers on hysteretic non-linear seabed. Applied Ocean Research 2014; 44: 20-28. doi: 10.1016/j.apor.2013.10.006. [05] Liu H, Liu C, Zhao Y, Wang C. Comparative study of reverse catenary properties of the installation line of drag anchors. Applied Ocean Research 2014; 48: 42-54. doi: 10.1016/j.apor.2014.07.011. [06] Patel MH, Vaz MA. The transient behavior of marine cables being laid – the two-dimensional problem. Applied Ocean Research 1995; 17: 245-258. doi: 10.1016/0141-1187(95)00016-X. [07] Zhu DS, Cheung YK. Optimization of buoyancy of an articulated stinger on submerged pipelines laid with a barge. Ocean Engineering 1997; 24: 301-311. doi: 10.1016/S0029-8018(96)00012-1. [08] Wang W, Chen G. Analytical and Numerical Modeling for Flexible Pipes. China Ocean Engineering 2011; 25: 737-746. doi: 10.1007/s13344-011-0059-9. [09] Croll JGA. Bending boundary layers in tensioned cables and rods. Applied Ocean Research 2000; 22: 241-253. doi: 10.1016/S0141-1187(00)00007-9. [10] Custódio AB, Vaz MA. A nonlinear formulation for the axisymmetric response of umbilical cables and flexible pipes. Applied Ocean Research 2002; 24: 21-29. doi: 10.1016/S0141-1187(02)00007-X. [11] Orsic JP, Nabergoj R. Nonlinear dynamics of an elastic cable during laying operating in rough sea. Applied Ocean Research 2005; 27: 255-265. doi: 10.1016/j.apor.2006.03.002. [12] Song LJ, Fu SH, Li M, Gao Y, Ma LX. Tension and Drag Forces of Flexible Risers undergoing Vortex-Induced Vibration. China Ocean Engineering 2017; 31: 1-10. doi: 10.1007/s13344-0001-x. [13] Bai Y, Bai Q. Subsea Engineering Handbook. Gulf Professional Publishing, 2012. [14] American Petroleum Institute. API RP 17B - Recommended Practice for Flexible Pipe, 2002. [15] Schimidt FT. Instalação de Linhas Flexíveis e Umbilicais: Testes de Condicionamento e Falhas Operacionais. Master Dissertation, Fluminense Federal University, Niteroi, 2016. (in Portuguese). doi: 10.13140/RG.2.1.1813.0806). [16] Feld G, Owen DG. Mechanical behavior of the metallic elements of submarine cables as a function of cable loading. Engineering Structures 1995; 17: 240-253. doi: 10.1016/0141-0296(95)00023-Z. [17] Yan SW, Jia ZL, Feng XW, Li ST. Umbilical Cable Recovery Load Analysis. China Ocean Engineering 2013; 27: 351-358. doi: 10.1007/s13344-013-0030-z. [18] Tayama H, Fukuda O, Yamamoto K, Inoue Y, Koike Y. 6.6 kV XLPE Submarine cable with Optical Fiber Sensors to detect Anchor Damage and Defacement of Wire Armor. IEEE Trans on Power Delivery 1995; 10: 1718-1723. doi: 10.1109/61.473389. [19] IEEE Power Engineering Society. IEEE Std. 1120-2004 – IEEE Guide for Planning, Design, Installation, and Repair of Submarine Power Cable Systems, 2004. [20] Wald D, Orton H, Svoma R. Requirements for different components in cables for offshore application. Proc 9th Int Conf Properties and applications of Dielectric Materials, Harbin, China 2009. [21] Choi JK, Nishida S, Yokobiki T, Kawaguchi K. Automated Cable-Laying System for Thin Optical-Fiber Submarine Cable Installation. IEEE Journal of Oceanic Engineering 2015; 40: 981-992. doi: 10.1109/JOE.2014.2363785. [22] Jin Y, Wan B, Liu D, Peng Y, Guo Y. Dynamic analysis of launch & recovery system of seafloor drill under irregular waves. 2016; 117: 321-331. doi: 10.1016/ j.oceaneng.2016.03.056. [23] Bawart M, Marzinotto M, Mazzanti G. Diagnosis and location of faults in submarine power cables. IEEE Electrical Insulation Magazine 2016; 32: 24-37. doi: 10.1109/MEI.2016.7528987. [24] Malcorps A, Felix-Henry A. Validations of a computer model for flexible pipe crushing resistance calculations. Proc ASME 2008 27th Int Conf on Offshore Mechanics and Arctic Engineering. Estoril, Portugal 2008. doi: 10.1115/OMAE2008-57381.