The goal of this research was to gather knowledge and to analyze the problem of excessive vibration level of Gas Turbine Generator (GTG) 100 MW system installed in cogeneration power plant in Sumatra Island, Indonesia which supports one of biggest oil and gas industries in Indonesia. The case research related to vibration problem were presented to diagnosis the main causes of excessive vibration that occur in the gas turbine generator during operation. Vibration analysis is one of the most important activities in predictive maintenance. Vibration monitoring system and machinery diagnostic technical specification are presented. The vibration data of this research were collected using online vibration monitoring system Bently Nevada 3500 series and system 1® display software at different bearing locations during transient (shutdown & start-up and steady state (on-line) condition. Assessment on overall vibration levels shall refer to Original Equipment Manufacturer (OEM) alert & danger set points, as well as relevant ISO 20816-2 standard. Finally, recommendation of reducing excessive vibration level is provided to ensure safe and reliable operation of the GTG unit.
A firm’s leverage and profitability are two significant aspects of overall firm management. This study mainly aims at examining and analyzing the determinants of leverage and profitability in Indonesian mining firms listed by including both trade-off theory and pecking order theory approaches. Secondary data as sample has been collected for 26 Indonesian mining firms listed in Indonesian stock exchange (IDX), for the period of 9 years from 2010 to 2018. Firm’s size, asset tangibility, asset growth, and liquidity have been selected as exogenous variables to examine their effect on endogenous variables, i.e., leverage and profitability. Path analysis technique was employed to analyze the research data. The results indicate that leverage exerts negative impact on firm profitability. The finding results of this study provides great insights for Indonesian mining firm management, to integrate the financial leverage models in their financial decision to obtain optimum firm profitability.
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