Vol. 19 No. 2 (2004)

Inspection is an activity to detect and evaluate the possibility of damage or degradation of operating equipment. Risk Based Inspection (RBI) Method is one of management inspection methods based on risk level of an equipment or a work unit. The RBI Method uses a combination of two parameters (category of failure possibility and category of failure consequence) for determining the level of risk for industrial equipment. The method was applied to several chemical reactors in a petrochemical industry such as Hydrotreater, Secondary Reformer, Shift Converter, Ammonia Synthesis Converter,…

One of the methods for increasing separation efficiency of a cyclone is to implement a fabric filter at its inner tube. The combination of cyclone separator and fabric filter in commonly called as cyclo-dust filter. This paper presents an experimental study of the performance test of cyclo-dust filter and CFD numerical simulation of the flow inside this apparatus. The experiment was conducted for some variation of filter area. The results show that the separation efficiency of more than 99% was observed. This value is normally very difficult to reach with a normal cyclone separator. The…

This paper explores the study of numerical determination of roller bearing stiffness as a result of wear increment by using contact Hertzian method. This study is part of the research on the determination of roller bearing vibration response as a result of wear increment. In this paper, wear is assumed as diametral clearance, Cd, and force work in radial direction. Computational method shows that increasing wear causes the decrease of stiffness. The relationship between deflection and stiffness, radial load and stiffness as a function of Cd can be determined.

Horizontal Axis Wind Energy Conversion System (HAWECS) is more efficient than other Wind Energy Conversion Systems at the same condition [2,3]. Rotating cylindrical blade is taken as the substitute alternative to the airfoil blade considering that presence of lift force and its simple manufacturing production. The lift force generated by the rotating cylinder is known as the Magnus Effect [1,7,9]. The savonius rotor in this research is employed to propel the cylinder. This research conducted an experiment to optimize the energy conversion of a HAWECS which its blades consist of the…

Application of biogas generated from palm oil mill effluent for producing electricity has been proven as an ecological alternative to naphtha and fossil fuels. In the first part of this article, the process of making oil from fresh fruit bunches is briefly described together with amounts of waste gained. After that, different types of treatment of palm oil mill effluent (POME) as one of results of the process are examined, resulting in a suggestion of anaerobic digestion under thermophilic conditions as the best way to treat POME. Finally, attention is also paid to the emission reduction…