International Journal of Marine Engineering Innovation and Research, Vol. 1(4), Sept. 2017. 250-260 (pISSN: 2541-5972, eISSN: 2548-1479) 250 Damage Analysis of Elbow Fitting at Condenser Air Conditioning Cooling System Hari Prastowo 1 , Irfan Syarief 2 , Hamzah Fansyuri 3 Abstract elbow fittings is one type of fitting on the piping installation that serves to change the flow direction. With the sudden flow of changes, it will affect the physical condition of the elbow. The flow changes in the elbow will result in changes of flow velocity that affect wall of elbow, the condition will cause erosion corrosion phenomenon. Erosion corrotion is a type of corrosion that uses a mechanical process through the relative movement of the flow and metal. Corrosion erosion can also be caused by impingment corrotion or very rapid flow movement. This study aims to determine the cause of damage elbow by using a CFD simulation and troubleshooting by adding a Vortex Generator or a installed disturber system in the pipeline installation and simulating it again. From the results of research conducted that elbow damage caused by high flow velocity that concerns the outer elbow. The addition of Vortex Generator is proven to be used to reduce excessive flow velocity on erosion-corroded parts. According to the results of the investigation the placement of the most efficient vortex generator if placed at a distance of 0.1 R from elbow inlet. Keywords computational fluid dynamic (CFD), erosion corrotion, flow velocity, vortex generator. I. INTRODUCTION 1 Piping system is a system that serves to flow a fluid from a lower place to a desired destination with the machinery either a pump or a compressor. For example, piping systems used to move fuel or lubricants from tanks to engines, seawater supply systems as coolants, as well as systems for ballast system, and many more examples of piping systems on board Supporting safety operations, as well as support systems for crew activities on board In planning of piping installation system is expected to produce efficient pipeline installation which in terms of laying and safety aspect in operation must be considered according to the classification rules and from the installation guide specification of machinery support system [1-9]. With the availability of limited space in the vessel, the installation system is expected to run as efficiently as possible. The piping installation system in the vessel use fittings or adding more installations to allow the flowing fluid to reach the desired destination with very minimum space [2, 10-16]. The fittings in a piping system installation serve to change direction of flow, spread the flow, increase or Hari Prastowo, Departmen of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia, Email : hariprastowo@gmail.com Irfan Syarief, Departmen of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia, Email : Irfansya@gmail.com Hamzah Fansyuri, Departmen of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia, Email : hamzah.fansyuri13@mhs.ne.its.ac.id decrease the flow. Related to elbow fitting in this research will be disscuded about damage of Elbow fittings (bend) on condenser air conditioning cooling system in ship of Indonesian Navy. The condenser is a part of the refrigeration that receives the vapor from high pressure and hight temperature refrigerant from the compressor and removes the heat condensat by cooling the high pressure and hight temperature refrigerant vapor to its dew point by removing its sensible heat [3]. In this case the type of condenser used is a double pipe type with a sea water as a refrigerant cooler. Elbow fittings is a fitting that serves as a flow change in a piping system installation. The damage demage of elbow fitting is due to the hight flow velocity affecting thewall of elbow. It is commonly known by the corrosion erosion or corrosion due to the very rapid fluid flow affecting the metal wall [4, 17-20]. Based on the existing problems, in this research will be discussed about flow analysis that occurred in the fitting and problem solving method to solve the problem. II. METHOD The methodology used in this study is a simulation based method, which will be tested using software according to the specification of the existing system which then the results of the simulation will be used as a reference for solving a problems. This methodology covers all activities that will be carried out to solve the problem or do the analysis process in this problem. For more details will be described as follows: A. Problem Identification This thesis writing begins with identifying and formulating problems regarding the work to be done as well as the limitations of the problem. This is to simplify the problem so as to facilitate the work and completion of this research.