Jurnal Pendidikan Teknologi Kejuruan
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Risk indentification on superheater pipeline boiler of 600 MW power plants using a risk based inspection (RBI) method
Full text linkSteam power plants are the most efficient type of power generation and can make a significant contribution to the demand for electricity resources. Steam power plants, in general, utilize energy derived from seawater to be process into steam in boilers so that often many pipe failures have occurred due to thinning due to corrosion caused by inappropriate water quality in small units and difficult to detect continuously. In general, inspection planning related to pipe thinning in steam power plants shows a minimal trend compared to inspections in the oil & gas industry. Moreover, it has no basic policy as to how inspection intervals and piping methods will be carry out. In this study, it carried out with the aim of conducting a risk assessment of boiler pipe failure so that it can provide a more optimal overview of the inspection plan. Analysis using Risk Based Inspection (RBI) will be used as a research reference to create the most effective and efficient inspection system as to minimize the impact and expenses cost in pipeline maintenance. After RBI assessment, the inspection plan for superheater pipeline on boiler line will be held every 2 years
Corrosion failure analysis of CuNi 90/10 on seawater fire protection system
Full text linkThe failure analysis of a seawater fire protection system of oil and gas processing facility was observed in this paper. The fire protection pipe line & hull seawater filter were made of CuNi 90/10. Severe deep pits and fracture were observed at bottom of jockey pump spool pipe and hull seawater filter. Visual observation, scanning electron microscope, energy dispersive spectroscopy, x-ray diffractometry were employed in the present failure analysis. The oxygen exposure on CuNi 90/10 of Seawater Fire Protection system had a significant impact on failure and was exacerbated by the presence of chloride exposure
Perceptions of Trans Padang bus drivers on type A terminal location case study: Anak Air type A terminal
Full text linkSince the inactivity of the Bingkuang Regional Terminal in 2009, the city of Padang no longer has a bus terminal, which causes many shadow terminals in the city of Padang. In 2021, the Type A Terminal in Padang City was completed and tested immediately since not October 2021. However, since the trial until now this terminal is still quiet for buses and the public to visit. Then in 2021, the Type A Terminal in Padang City was completed and tested immediately since not October 2021. However, since the trial until now this terminal is still quiet for buses and the public to visit. Anak Air Type A Terminal is still quiet due to its location which is far from the city center, and access to the Anak Air Type A Terminal is considered quite difficult. The formulation of the problem in this study is how the perception of the Trans Padang bus driver on the location of the Anak Air Type A Terminal and the completeness of the facilities it has. The standard used in this study is the Decree of the Director General of Land Transportation No. 31 of 1995 concerning Road Transportation Terminals. The purpose of this study was to find out and provide the opinion of bus drivers on the existence of Anak Air Type A Terminal in Padang City and determine the feasibility of the Anak Aia Terminal based on the facilities it has. The method used in this research is qualitative type. The sample in this study was the Trans Padang bus driver. The data were collected by using interview techniques with Trans Padang bus drivers who enter the Anak Air Type A Terminal every day, observations at the terminal location to record the facilities that this terminal already has and documentation in the form of photographs. The results of the research that has been carried out through interviews with Trans Padang bus drivers found 3 keywords, namely the location of the terminal which is considered appropriate, access to the terminal is difficult to pass and there are still many facilities that are not yet available at Anak Air Type A Terminal
Engineering and economic analysis of sawdust biomass processing as a co-firing fuel in coal-fired power plant boiler pulverized coal type
Full text linkOne type of alternative fuel that has the potential to be developed and can contribute significantly to the NRE mix is biomass. The significance of the energy mix is obtained from the use of the co-firing system at the Coal-Fired Power Plant (CFPP) by mixing coal fuel with biomass such as sawdust. Sawdust biomass as cofiring material for CFPP is very efficient because it has energy content and availability that is easy to manage. The aim of this research is to make technical and economic analysis of sawdust biomass as solid fuel for pulverized coal CFPP Co-firing type boiler. The research stages are mapping the potential of sawdust biomass to determine the availability of potential biomass around the location of the co-firing, analyze the technical side and specifications contained in sawdust biomass raw materials to determine the suitability or feasibility of pulverized coal type CFPP specifications, and analyze the economic feasibility of developing sawdust biomass processing technology to determine the cost of production of sawdust biomass so that later it will not have a technical and financial impact. The results of the economic analysis show that the sawdust biomass production business is feasible with NPV parameters > IDR 5,252,097,371, IRR=11.1% and payback period=7.7 years. Provided that if the PLTU Rembang buys biomass at a price of Rp. 862,730/Ton. Sensitivity analysis is used to determine the steps to optimize the adjustment of the ability to purchase biomass from CFPP Rembang where the reference limit for the highest reference price for biomass is IDR 782,006. Efforts that can be made to adjust the ability to purchase biomass from the CFPP Rembang include increasing the yield by 20% or reducing the price of wood by 20%
The corona losses detection analysis at high voltage
Full text linkThe increasing use and use of electricity in Indonesia causes the potential for greater losses in the transmission and distribution system. This causes many problems that arise, one of which is the corona in the transmission and distribution system. Corona mapping can only be detected through several ways, namely sound, light and distinctive smell. In this thesis, the aim is to detect the corona with the characteristics of a distinctive sense of smell, then the results of the detection are compared with the calculated corona losses. This distinctive odor is the smell of ozone which is produced from ionization at high voltage with the surrounding air, namely oxygen to form ozone molecules that are not permanent. The metal electrode to be tested is the copper tip metal. After testing the voltage of the appearance of the corona occurs at 7kV, high voltage when testing the tip of the copper metal point at a voltage of 21 kV is greater than the corona losses. The greater the voltage, the greater the corona losses generated
The effectiveness of the product-based learning model corresponding to Indonesian national standard competency (SKKNI) for the furniture industry in learning applications of wood construction
Full text linkThe industrial revolution era has significantly impacted Indonesian education\u27s development. Education is not only monotonous to study students but also provides opportunities to develop themselves according to their interests and talents. In this lecture, students\u27 practicum products usually only become waste and are not yet suitable for use and even worth selling. The researcher plans to develop a Wood Construction Application learning with a product-based learning approach combined with SKKNI no. 61 of 2021, the wood furniture industry standard. This research is essential to find the most suitable strategy or practice in the Wood Construction Applications lecture. This study aims to develop learning based on the wood furniture industry with a product-based learning approach. The type of research used is research and development with the ADDIE model. The targeted outputs are in the form of books. The experimental and control classes\u27 results of the pretest and post-test obtained an average result of pretest 20 and post-test of 93.31. In the control class, the average results of the pretest were 22.5, and the post-test was 73.38. While the results of the N-Gain value in the experimental and control classes, the experimental class obtained a value of 0.92 with a high category. In the control class, a score of 0.65 is included in the medium category
The effects of leadership style, organizational culture and self-concept on trainers’ performance at the vocational training institutions
Full text linkThe purpose of this study is to understand the influence between leadership style, organizational culture, and self-concept on the trainers’ performance at the Vocational Training Institutions in Batam. These factors are contributing a lot to the successive performance of the students, trainers, and institutions. However, this study only gives framework to the performance of the trainers. Improving trainers’ performance will lead to the improvement of training or educational operation. Some methods such as interviews, observations and questionnaires were used to collect the data. There were 82 trainers selected as respondents to fill the questionnaires, and the data obtained were analyzed using SPSS program. Statistical test methods such as prerequisite analytical tests, t-test, F-test, multiple linear regressions, and coefficients determination. The results give conclusion that there is significant effect and correlation between the leadership styles, organizational cultures, and self-concept on the trainers’ performance at the Vocational Training Institutions in Batam
Implementation of video learning to lmprove student learning outcomes at SMK N 2 Padang
Full text linkDuring the COVID-19 pandemic, the learning process, which was usually carried out face-to-face in front of the class, could no longer be carried out. So that with the spread of the covid-19 virus, the teaching and learning process has turned into distance learning to limit the spread of the covid 19 virus. Online distance learning began in early March 2020. This requires educators to think about what methods and media will be used. used for the teaching and learning process. For this reason, learning videos (Youtube) are used in the classroom teaching process. The purpose of this study was to improve learning outcomes by applying learning videos (Youtube) in Class XII BDP 1 SMK N 2 Padang. Based on the data analysis of the first cycle to the second cycle there is an increase in learning outcomes. The percentage in the first cycle of 72.73% rose to 91.34% in the second cycle. The increase of 18.61% in the percentage result in both cycle I and cycle II has reached the percentage that the author set at the beginning of the study, which is 65%. The average student learning outcome in the first cycle was 82.57 with a percentage of 72.73%. At the end of the second cycle learning outcomes increased to 87.45 with a percentage of 91.34%. The minimum completeness standard in this study is 80 and the research indicator is determined that 80% of students complete above the SKM. In this study, there were 91.34% of students above the SKM. Based on the results of this study, it is suggested that teachers in the field of online business and marketing skills competency studies can use learning videos for online learning.During the COVID-19 pandemic, the learning process, which was usually carried out face-to-face in front of the class, could no longer be carried out. So that with the spread of the covid-19 virus, the teaching and learning process has turned into distance learning to limit the spread of the covid 19 virus. Online distance learning began in early March 2020. This requires educators to think about what methods and media will be used. used for the teaching and learning process. For this reason, learning videos (Youtube) are used in the classroom teaching process. The purpose of this study was to improve learning outcomes by applying learning videos (Youtube) in Class XII BDP 1 SMK N 2 Padang. Based on the data analysis of the first cycle to the second cycle there is an increase in learning outcomes. The percentage in the first cycle of 72.73% rose to 91.34% in the second cycle. The increase of 18.61% in the percentage result in both cycle I and cycle II has reached the percentage that the author set at the beginning of the study, which is 65%. The average student learning outcome in the first cycle was 82.57 with a percentage of 72.73%. At the end of the second cycle learning outcomes increased to 87.45 with a percentage of 91.34%. The minimum completeness standard in this study is 80 and the research indicator is determined that 80% of students complete above the SKM. In this study, there were 91.34% of students above the SKM. Based on the results of this study, it is suggested that teachers in the field of online business and marketing skills competency studies can use learning videos for online learning
Anticorrosive Epoxy Coatings Enhanced with Rice Husk Derived-Graphene
Full text linkCoatings are the most common corrosion control practice. Therefore, it is very important to discover the most cost-effective and environmentally-friendly coating materials for sustainability. When dispersed in epoxy resin, graphene has barrier properties that improve the anticorrosive performance of the metal significantly. Graphene can be synthesized from agricultural waste. Herein, graphene derived from rice husk and epoxy resin was developed with solution mixing to prepare graphene-epoxy coating composites with enhanced anti-corrosive properties. X-ray diffraction, UV-vis spectroscopy, and scanning electron microscopy were used to characterize the synthesized graphenes. The anticorrosive properties of the coatings were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy, which resulted in the corrosion resistance of synthesized graphene and commercial reduced graphene oxide being better than commercial graphene. The impedance and corrosion rate values of synthesized graphene are 1.77 x 105 Ω and 0.00011 mm/year.Coatings are the most common corrosion control practice. Therefore, it is very important to discover the most cost-effective and environmentally-friendly coating materials for sustainability. When dispersed in epoxy resin, graphene has barrier properties that improve the anticorrosive performance of the metal significantly. Graphene can be synthesized from agricultural waste. Herein, graphene derived from rice husk and epoxy resin was developed with solution mixing to prepare graphene-epoxy coating composites with enhanced anti-corrosive properties. X-ray diffraction, UV-vis spectroscopy, and scanning electron microscopy were used to characterize the synthesized graphenes. The anticorrosive properties of the coatings were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy, which resulted in the corrosion resistance of synthesized graphene and commercial reduced graphene oxide being better than commercial graphene. The impedance and corrosion rate values of synthesized graphene are 1.77 x 105 Ω and 0.00011 mm/year
Level of interest and performance of tourism facilities in the attraction of the peak tourism of Paragliding
Full text linkThis research started from observations, which were seen based on data from Puncak Paragliding tourist visits which decreased from January to September, this occurred due to the outbreak of the Covid - 19 pandemic that entered and resulted in the imposition of a lockdown system or PSBB in almost all regions in Indonesia including the city of Padang. . Where the government prohibits residents from making tourist visits in order to prevent the transmission of the Covid-19 pandemic. Only in the last three months of 2021 has the level of tourist visits coming to the Puncak Paragliding tourist attraction experienced a significant increase, this is of course accompanied by implementing strict health protocols. Researchers also observe other problems, namely as a tourist attraction Puncak Paragliding is faced with the challenge of being able to attract tourists who want to visit. This is certainly important to do because as one of the businesses engaged in services. In addition, facilities are facilities and infrastructure that play an important role in efforts to increase tourist satisfaction. The results showed that there were 6 indicators in quadrant 1 (Concentrate Here, Top Priority) High Importance, Low Performance, there were 2 indicators in quadrant 2 (Keep Up The Good Work, Maintain Performance) High Importance, High Performance, there were 2 indicators that are in quadrant 3 (Low Priority) Low Importance, Low Performance and there are 3 indicators that are in quadrant 4 (Possibly Overkill, Excessive) Low Importance, High Performance.