Cooling tower is a heat exchanger used to cool water from the condenser. The process is carried out by contacting water with air directly and discharged into the atmosphere using air fluid that is flowed naturally or flowed by a fan. Cooling tower type used in PLTP Kamojang Unit 5 is Induced draft Counter Flow. This equipment more important in increasing turbine efficiency, therefore special treatment is needed by knowing and observing the performance of the Cooling tower so that it can be analyzed in actual conditions and make decision steps in carrying out further repairs and maintenance, this is the basis of research that will be carried out by looking for value and the Cooling tower performance trendline. The calculation method uses the standard ASME PTC 23-2003 and CTI ATC-105 where the results are the calculation baseline and the historical trendline of Cooling tower performance based on the parameters of the 3-cell Cooling tower operating conditions. The parameters tested are by taking 5 valid data on PLTP KMJ Unit 5, then the Tower Capability performance values are obtained as follows, namely in the initial commissioning conditions the performance value is 92,1%, Q1 2021 is 78,8%, Q3 2021 is 74, 3%, Q4 2021 is 84,7%, and Q1 2022 is 83,8%. There was a decrease in Q3 2021. Then there was an increase in the trend in Q4 2021 due to previous overhaul activities on the Cooling tower. Keywords: Cooling tower, trendline, overhaul, tower capability
{"title":"ANALISIS PERFORMANCE COOLING TOWER TIPE INDUCED DRAFT COUNTER FLOW PLTP KAMOJANG UNIT 5","authors":"Hasan Abdurohman, Juli Mrihardjono, S. Darmanto","doi":"10.35308/jmkn.v8i2.6526","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6526","url":null,"abstract":"Cooling tower is a heat exchanger used to cool water from the condenser. The process is carried out by contacting water with air directly and discharged into the atmosphere using air fluid that is flowed naturally or flowed by a fan. Cooling tower type used in PLTP Kamojang Unit 5 is Induced draft Counter Flow. This equipment more important in increasing turbine efficiency, therefore special treatment is needed by knowing and observing the performance of the Cooling tower so that it can be analyzed in actual conditions and make decision steps in carrying out further repairs and maintenance, this is the basis of research that will be carried out by looking for value and the Cooling tower performance trendline. The calculation method uses the standard ASME PTC 23-2003 and CTI ATC-105 where the results are the calculation baseline and the historical trendline of Cooling tower performance based on the parameters of the 3-cell Cooling tower operating conditions. The parameters tested are by taking 5 valid data on PLTP KMJ Unit 5, then the Tower Capability performance values are obtained as follows, namely in the initial commissioning conditions the performance value is 92,1%, Q1 2021 is 78,8%, Q3 2021 is 74, 3%, Q4 2021 is 84,7%, and Q1 2022 is 83,8%. There was a decrease in Q3 2021. Then there was an increase in the trend in Q4 2021 due to previous overhaul activities on the Cooling tower. Keywords: Cooling tower, trendline, overhaul, tower capability","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128223349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aims to obtain information about the flow characteristics of Water-Air Flow, Mixture of Glycerin+Water(G20)-Air, and Mixture of Aquadest+Butanol 4%-Air. The two-phase flow characteristics in mini-sized pipes have significant differences with the two-phase flow characteristics in conventional pipes, so it will affect fluid distribution processes involving two-phase flow such as heat transfer processes. Therefore, it is necessary to conduct further studies on the two-phase flow pattern in mini-sized pipes. This research was conducted in a test section in the form of a glass pipe with a diameter of 1.6 mm in a horizontal position. The liquid fluid used is water which has a surface tension (σ) of 71 mN/m, a mixture of glycerin+water (G20) has a surface tension (σ) of 62.5 mN/m, and a mixture of distilled water+butanol 4% has a surface tension (σ) of 36.50 mN/m. Superficial velocity of gas (JG)=0.033–4.935 m/s, and superficial velocity of liquid (JL)=0.025–66.3 m/s. The results showed that stratified flow was not observed in the mini channel as can be found in conventional pipes. The detected flow patterns are: bubbly, slug, slug-annular, churn, and annular. The results of flow pattern maps compared with flow pattern maps from Triplett et al (1999a), Chung and Kawaji (2004) and Sudarja et al (2014), and Aqli et al (2015) show that the higher the viscosity, the higher the annular churn-slug flow transition line will be. decreases while the annular – slug annular transition line tends to be more sloping.
本研究旨在获得水-空气流动、甘油+水(G20)-空气混合物和Aquadest+丁醇4%-空气混合物的流动特性信息。微型管道中的两相流动特性与常规管道中的两相流动特性存在显著差异，因此会影响传热过程等涉及两相流的流体分布过程。因此，有必要对小尺寸管道内的两相流进行进一步的研究。本研究在水平位置采用直径为1.6 mm的玻璃管形式的试验段中进行。所用的液体为水，表面张力(σ)为71 mN/m，甘油+水(G20)的混合物表面张力(σ)为62.5 mN/m，蒸馏水+ 4%丁醇的混合物表面张力(σ)为36.50 mN/m。气体表面速度(JG)= 0.033-4.935 m/s，液体表面速度(JL)= 0.025-66.3 m/s。结果表明，在小通道内没有常规管道中存在的分层流动现象。检测到的流型有:气泡流、段塞流、段塞环空流、搅拌流和环空流。与Triplett et al . (1999a)、Chung and Kawaji(2004)、Sudarja et al .(2014)、Aqli et al .(2015)的流型图比较，流型图的结果表明，粘度越高，环形搅拌段塞流过渡线越高。当环空段塞环空过渡线趋于倾斜时减小。
{"title":"Karakteristik Pola Aliran Air-Udara, Campuran Air+Gliserin (G20)-Udara, dan Campuran Akuades+Butanol 4%-Udara Pada Pipa Horizontal Berukuran Mini","authors":"F. Jayadi, Sudarja Sudarja, Eli Komolosari","doi":"10.35308/jmkn.v8i2.6470","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6470","url":null,"abstract":"This study aims to obtain information about the flow characteristics of Water-Air Flow, Mixture of Glycerin+Water(G20)-Air, and Mixture of Aquadest+Butanol 4%-Air. The two-phase flow characteristics in mini-sized pipes have significant differences with the two-phase flow characteristics in conventional pipes, so it will affect fluid distribution processes involving two-phase flow such as heat transfer processes. Therefore, it is necessary to conduct further studies on the two-phase flow pattern in mini-sized pipes. This research was conducted in a test section in the form of a glass pipe with a diameter of 1.6 mm in a horizontal position. The liquid fluid used is water which has a surface tension (σ) of 71 mN/m, a mixture of glycerin+water (G20) has a surface tension (σ) of 62.5 mN/m, and a mixture of distilled water+butanol 4% has a surface tension (σ) of 36.50 mN/m. Superficial velocity of gas (JG)=0.033–4.935 m/s, and superficial velocity of liquid (JL)=0.025–66.3 m/s. The results showed that stratified flow was not observed in the mini channel as can be found in conventional pipes. The detected flow patterns are: bubbly, slug, slug-annular, churn, and annular. The results of flow pattern maps compared with flow pattern maps from Triplett et al (1999a), Chung and Kawaji (2004) and Sudarja et al (2014), and Aqli et al (2015) show that the higher the viscosity, the higher the annular churn-slug flow transition line will be. decreases while the annular – slug annular transition line tends to be more sloping. ","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122615053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Masykur Masykur, M. Saputra, F. Jayadi, Al Munawir, J. Supardi, Muazar Muazar
This study aims to look at the performance of the solar water heater collector with the addition of a reflector. Reflector is used to increase the absorption of solar radiation. The test was carried out by varying the water flow rate in the pipe, namely 75 l/hour, 150 l/hour and 225 l/hour with a collector tilt angle of 30°. Tests are carried out every one hour, starting at 09.00-16.00 WIB for each variation. Parameters measured in this study included glass temperature, inlet water temperature, outlet water temperature, pipe temperature, absorber temperature, ambient temperature and wind speed. The results showed that the highest efficiency occurred at a flow rate of 225 l/hour, which was 62.44% at IT 3,366 MJ/m2, and the highest ratio of outlet water temperature and inlet water temperature was 1.51 at a flow rate of 75l/h. Adding a reflector to the coverslip can increase collector efficiency.
{"title":"Performa Solar Water Heater Collector Dengan Menggunakan Reflektor Dan Variasi Laju Aliran Air","authors":"Masykur Masykur, M. Saputra, F. Jayadi, Al Munawir, J. Supardi, Muazar Muazar","doi":"10.35308/jmkn.v8i2.6535","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6535","url":null,"abstract":"This study aims to look at the performance of the solar water heater collector with the addition of a reflector. Reflector is used to increase the absorption of solar radiation. The test was carried out by varying the water flow rate in the pipe, namely 75 l/hour, 150 l/hour and 225 l/hour with a collector tilt angle of 30°. Tests are carried out every one hour, starting at 09.00-16.00 WIB for each variation. Parameters measured in this study included glass temperature, inlet water temperature, outlet water temperature, pipe temperature, absorber temperature, ambient temperature and wind speed. The results showed that the highest efficiency occurred at a flow rate of 225 l/hour, which was 62.44% at IT 3,366 MJ/m2, and the highest ratio of outlet water temperature and inlet water temperature was 1.51 at a flow rate of 75l/h. Adding a reflector to the coverslip can increase collector efficiency.","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129843916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Many tensile tests are carried out to complete the basic design information of the strength of a material and as supporting data for material specifications. In the tensile test, the test object is given a load of tensile force that increases continuously, at the same time observations are made regarding the extension experienced by the test object. This study aims to determine the mechanical properties and their changes from a metal to tensile loading using qualitative methods and data collection methods using literature review. The study is carried out by collecting data through a literature book related to the object of the final project. The test results of the material that has the smallest value, namely Aluminum, are obtained, the value without heat treatment is Voltage = 566 N / mm2, Strain = 7.9 , ME = 72.1 N / mm2) and the value using heat treatment is Voltage = 439 N / mm2), Strain = 3.5, ME = 124.5 N / mm2). While the largest value, namely Iron Concrete TP 280, was obtained, the value without heat treatment was Voltage = 1012 N / mm2, Strain = 6.5 , ME = 156.4 N / mm2). While the values when using heat treatment are Voltage = 729 N / mm2), Strain = 3.7, ME =198.8 N / mm2). It can be concluded that the results of the comparative analysis of the strength of the test material without heat treatment and using heat treatment are known when the material is heated until it is close to its critical point, the material will form a new property that will make it change its properties to be tenacious or brittle.Keywords : Tensile Test, Stress, Strain, ME "Modulus of Elasticity", Heat Treatment
进行许多拉伸试验是为了完成材料强度的基本设计信息，并作为材料规格的支持数据。在拉伸试验中，对被试对象施加持续增加的拉力载荷，同时观察被试对象所经历的拉伸。本研究的目的是确定力学性能及其变化，从金属拉伸载荷采用定性的方法和数据收集的方法，通过文献综述。该研究是通过与最终项目的对象相关的文学书籍收集数据来进行的。得到值最小的材料铝的试验结果，未经热处理的值为电压= 566 N / mm2，应变= 7.9,ME = 72.1 N / mm2)，经过热处理的值为电压= 439 N / mm2，应变= 3.5,ME = 124.5 N / mm2)。其中铁混凝土TP 280最大，未热处理时电压= 1012 N / mm2，应变= 6.5,ME = 156.4 N / mm2。而采用热处理时的值为电压= 729 N / mm2)，应变= 3.7,ME =198.8 N / mm2)。可以得出结论，对未经热处理和使用热处理的试验材料的强度进行对比分析的结果是已知的，当材料被加热到接近其临界点时，材料将形成一种新的性能，这种性能将使其改变其性能为坚韧或脆性。关键词:拉伸试验，应力，应变，弹性模量，热处理
{"title":"ANALISA PERBANDINGAN HASIL UJI TARIK PADA BEBERAPA SPESIMEN DENGAN LOAD CELL BERKAPASITAS 500 KN","authors":"Irfan Al Ayubbi, Seno Darmanto, Didik Ariwibowo","doi":"10.35308/jmkn.v8i2.6418","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6418","url":null,"abstract":"Many tensile tests are carried out to complete the basic design information of the strength of a material and as supporting data for material specifications. In the tensile test, the test object is given a load of tensile force that increases continuously, at the same time observations are made regarding the extension experienced by the test object. This study aims to determine the mechanical properties and their changes from a metal to tensile loading using qualitative methods and data collection methods using literature review. The study is carried out by collecting data through a literature book related to the object of the final project. The test results of the material that has the smallest value, namely Aluminum, are obtained, the value without heat treatment is Voltage = 566 N / mm2, Strain = 7.9 , ME = 72.1 N / mm2) and the value using heat treatment is Voltage = 439 N / mm2), Strain = 3.5, ME = 124.5 N / mm2). While the largest value, namely Iron Concrete TP 280, was obtained, the value without heat treatment was Voltage = 1012 N / mm2, Strain = 6.5 , ME = 156.4 N / mm2). While the values when using heat treatment are Voltage = 729 N / mm2), Strain = 3.7, ME =198.8 N / mm2). It can be concluded that the results of the comparative analysis of the strength of the test material without heat treatment and using heat treatment are known when the material is heated until it is close to its critical point, the material will form a new property that will make it change its properties to be tenacious or brittle.Keywords : Tensile Test, Stress, Strain, ME \"Modulus of Elasticity\", Heat Treatment","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123679083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Due to the high use of motorized vehicles, air pollution will arise which can interfere with the environment and human health. The results of the combustion of motor vehicle fuels produce pollutants that are harmful to human health, if inhaled by humans, they can cause respiratory tract irritation, eye irritation and skin allergies, which can lead to lung cancer. The purpose of this study was to examine whether copper plates can be used as a substitute for catalytic converters to reduce exhaust gas emissions (CO and HC gases). The test results show that copper plate can be used as a catalytic converter replacement material with a significant reduction in exhaust emissions, with a decrease in the percentage of CO by 29.9% at 5000 rpm using a 10 winding catalyst, and a decrease in the percentage of HC by 33.9% at rotation. 5000 rpm using a 10 winding catalyst. Suggestions from this study are if you use it for daily purposes, you should use a catalyst that has 10 winding.
{"title":"Penambahan Katalik Konverter Plat Tembaga Berbentuk Spiral Terhadap Emisi Gas Buang Motor Bakar Menggunakan Gasboard 5020","authors":"M. Daryono, Seno Darmanto","doi":"10.35308/jmkn.v8i2.6414","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6414","url":null,"abstract":"Due to the high use of motorized vehicles, air pollution will arise which can interfere with the environment and human health. The results of the combustion of motor vehicle fuels produce pollutants that are harmful to human health, if inhaled by humans, they can cause respiratory tract irritation, eye irritation and skin allergies, which can lead to lung cancer. The purpose of this study was to examine whether copper plates can be used as a substitute for catalytic converters to reduce exhaust gas emissions (CO and HC gases). The test results show that copper plate can be used as a catalytic converter replacement material with a significant reduction in exhaust emissions, with a decrease in the percentage of CO by 29.9% at 5000 rpm using a 10 winding catalyst, and a decrease in the percentage of HC by 33.9% at rotation. 5000 rpm using a 10 winding catalyst. Suggestions from this study are if you use it for daily purposes, you should use a catalyst that has 10 winding.","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124782368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bakharuddin Yusuf, Seno Darmanto, S. Handayani, Susastro Susastro
PLTD (Diesel Engine Power Plant) is one generator used by several companies, especially electricity providers. It’s just that PLTD requires a large enough cost to produce electrical energy. Therefore it is necessary to make efforts to reduce operational costs, one of which is by making an alternative to charging the accumulator on the diesel engine. The alternatif is a prototype solar cell that can charge the 200 Ah 12 Volt accumulator so that the accumulator can be used for the starting process diesel engine (PLTD). So, at this writing the author tries to make an experimental study of the use of solar cells as an alternative to charging a 200 Ah 12 Volt accumulator which in this experimental study proceduces a 2 x 80 Wp mobile solar cell prototype that can be used for charging the accumulator of PLTD machines. In addition, from this experimental study, the results of accumulator charging of 1,444.92 Wh are sufficient to be used for the dynamo starter process on diesel diesel engines and the annual savings value is obtained.
PLTD(柴油发动机发电厂)是一种由几家公司，特别是电力供应商使用的发电机。只是PLTD需要足够大的成本来产生电能。因此，有必要努力降低运营成本，其中之一就是在柴油发动机上制造一种替代蓄电池充电的方法。该替代方案是一个原型太阳能电池，可以为200 Ah的12伏蓄电池充电，这样蓄电池就可以用于启动过程柴油发动机(PLTD)。因此，在撰写本文时，作者试图对使用太阳能电池作为充电200 Ah 12伏蓄电池的替代方案进行实验研究，在该实验研究中制作了一个2 x 80 Wp移动太阳能电池原型，可用于为PLTD机器的蓄电池充电。另外，从本实验研究中可知，蓄能器充电14444.92 Wh的结果足以用于柴油机的发电机起动过程，并获得了全年的节约值。
{"title":"KAJIAN EKSPERIMEN PENGGUNAAN SOLAR CELL SEBAGAI ALTERNATIF PENGISIAN AKUMULATOR 200Ah 12 Volt MESIN DIESEL PLTD","authors":"Bakharuddin Yusuf, Seno Darmanto, S. Handayani, Susastro Susastro","doi":"10.35308/jmkn.v8i2.6413","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6413","url":null,"abstract":"PLTD (Diesel Engine Power Plant) is one generator used by several companies, especially electricity providers. It’s just that PLTD requires a large enough cost to produce electrical energy. Therefore it is necessary to make efforts to reduce operational costs, one of which is by making an alternative to charging the accumulator on the diesel engine. The alternatif is a prototype solar cell that can charge the 200 Ah 12 Volt accumulator so that the accumulator can be used for the starting process diesel engine (PLTD). So, at this writing the author tries to make an experimental study of the use of solar cells as an alternative to charging a 200 Ah 12 Volt accumulator which in this experimental study proceduces a 2 x 80 Wp mobile solar cell prototype that can be used for charging the accumulator of PLTD machines. In addition, from this experimental study, the results of accumulator charging of 1,444.92 Wh are sufficient to be used for the dynamo starter process on diesel diesel engines and the annual savings value is obtained.","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"29 15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122919862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arief Prakoso Hardyanto, Wiji Mangestiyono, Seno Darmanto, Murni Murni
In the operation of the Bukit Asam power plant, in all generating units there are many disturbances that can cause derating the units. Derating of the unit can occur due to decrease in the performance of the steam turbine, decrease in the reliability of the pulverizer, and also disturbances in the coal supply system and various factors. Based on the performance data of the Bukit Asam Generation Sector (Monthly disturbance report) in January 2014, there were 54 derating disturbances recorded. One of the causes of the derating was a broken Pulverizer Shaft with a loss of operating hours for 196.78 [hours] which caused an unallocated electricity loss of 12,422 [GWh]. With the realization of AFI (Action For Improvement) in this final project creation assignment, it aims to redesign the shaft pulverizer, as well as analyze the causes of the pulverizer shaft break. By redesigning the pulverizer shaft and analyzing the cause of the pulverizer shaft breaking, it was found that the cause of the fracture of the shaft made from AISI 1045 with the old design was from calculating the shear stress value of 48.44 x 107 [N/m2], this result exceeded the value of the material permit voltage of 31.8 x 107 [N/m2], so it was not safe to use and the service life was not long. The results of the redesign shaft changed the dimensions of the diameter of the shaft head which was previously 0.174 [m] in diameter to a dwelling of 0.25 [m]. The results of calculating the redesign shaft made from AISI 1045 obtained a shear stress value of 16.33 x 107 [N/m2], this result is smaller than the material clearance voltage value of 31.8 x 107 [N/m2], so it is safer with a relatively longer service life.Keywords: Derating, Pulverizer Shaft, material, Redesign, Shear Stress
{"title":"REDESIGN PULVERIZER SHAFT UNIT 2 DI PLTU SEKTOR BUKIT ASAM 4 X 65 MW","authors":"Arief Prakoso Hardyanto, Wiji Mangestiyono, Seno Darmanto, Murni Murni","doi":"10.35308/jmkn.v8i2.6412","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6412","url":null,"abstract":"In the operation of the Bukit Asam power plant, in all generating units there are many disturbances that can cause derating the units. Derating of the unit can occur due to decrease in the performance of the steam turbine, decrease in the reliability of the pulverizer, and also disturbances in the coal supply system and various factors. Based on the performance data of the Bukit Asam Generation Sector (Monthly disturbance report) in January 2014, there were 54 derating disturbances recorded. One of the causes of the derating was a broken Pulverizer Shaft with a loss of operating hours for 196.78 [hours] which caused an unallocated electricity loss of 12,422 [GWh]. With the realization of AFI (Action For Improvement) in this final project creation assignment, it aims to redesign the shaft pulverizer, as well as analyze the causes of the pulverizer shaft break. By redesigning the pulverizer shaft and analyzing the cause of the pulverizer shaft breaking, it was found that the cause of the fracture of the shaft made from AISI 1045 with the old design was from calculating the shear stress value of 48.44 x 107 [N/m2], this result exceeded the value of the material permit voltage of 31.8 x 107 [N/m2], so it was not safe to use and the service life was not long. The results of the redesign shaft changed the dimensions of the diameter of the shaft head which was previously 0.174 [m] in diameter to a dwelling of 0.25 [m]. The results of calculating the redesign shaft made from AISI 1045 obtained a shear stress value of 16.33 x 107 [N/m2], this result is smaller than the material clearance voltage value of 31.8 x 107 [N/m2], so it is safer with a relatively longer service life.Keywords: Derating, Pulverizer Shaft, material, Redesign, Shear Stress","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121930960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alaya Fadllu Hadi Mukhamad, Seno Darmanto, Firdaus Kurniawan Haqni
Material shredders are used in construction projects to move materials from the starting point to the intended point. This trimming machine uses a type or system of crane pulley. In the world of construction, it can rarely be used in various terrains, whether flat terrain, valley terrain, or hilly terrain. Therefore, this paper aims to ensure that the process of upgrading / transferring the construction material of the 150 kV transmission tower can run well on flat terrain to difficult terrain such as valleys and hills based on several consideration factors. The design process of the material shredder consists of three stages, namely design, tool making, and tool testing. The design process consists of several stages, namely field review and the availability of supporting systems and raw materials. The fabrication process, carries out the assembly of materials that are already available by the predetermined design. The process of testing the tool, using the test method directly in the field so that the data presented is real loading data. The material drill engine can be used well in the field with a maximum carrying capacity of 250 kg with the highest effective tool capacity of 12,424kg/hour and fuel sed as much as 0.91 liters/hourKeywords : Design and Construction, Solidworks, Material Transfer Tool, Shifting Machine, Material Mover
{"title":"Rancang Bangun Mesin Pelangsiran Material Konstruksi Tower Transmisi Sistem Crane Pulley dengan Kapasitas Maksimal 250 kg","authors":"Alaya Fadllu Hadi Mukhamad, Seno Darmanto, Firdaus Kurniawan Haqni","doi":"10.35308/jmkn.v8i2.6409","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6409","url":null,"abstract":"Material shredders are used in construction projects to move materials from the starting point to the intended point. This trimming machine uses a type or system of crane pulley. In the world of construction, it can rarely be used in various terrains, whether flat terrain, valley terrain, or hilly terrain. Therefore, this paper aims to ensure that the process of upgrading / transferring the construction material of the 150 kV transmission tower can run well on flat terrain to difficult terrain such as valleys and hills based on several consideration factors. The design process of the material shredder consists of three stages, namely design, tool making, and tool testing. The design process consists of several stages, namely field review and the availability of supporting systems and raw materials. The fabrication process, carries out the assembly of materials that are already available by the predetermined design. The process of testing the tool, using the test method directly in the field so that the data presented is real loading data. The material drill engine can be used well in the field with a maximum carrying capacity of 250 kg with the highest effective tool capacity of 12,424kg/hour and fuel sed as much as 0.91 liters/hourKeywords : Design and Construction, Solidworks, Material Transfer Tool, Shifting Machine, Material Mover","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132923829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dedi Afandi, Ahmad Syuhada, Ratna Sary, Z. Zulfan, Asra Yufandi
Cooling towers are widely applied in industries such as power plants and oil refineries, where the equipment produces excess heat that needs to be removed. The effect of baffles configuration on the performance of the novel cooling tower prototype was studied experimentally. The configuration of the baffles used is the baffle section without holes, the baffle section with 15 holes, the baffle section with 25 holes, and the baffle section with 35 holes. The water inlet temperature was varied, namely 55⁰C, 75⁰C, and 90⁰C. water is flowed from the main reservoir to the upper reservoir of the cooling tower using a pump, and water from the upper reservoir falls on the baffles of the cooling tower. Inlet water temperature, outlet water temperature, and water temperature at each baffle were measured using a thermocouple. The results showed that the cooling tower with a baffle of 35 holes produced the most optimal performance. The heat transfer rate produced by the cooling tower with a 35-hole baffle at an inlet temperature of 55⁰C is 624.64 Watts. At the water inlet temperature of 75⁰C, the average heat transfer rate produced by the cooling tower with a 35-hole baffle increased by 42.6%. The average heat transfer rate produced by a cooling tower with a 35-hole baffle at a water inlet temperature of 90⁰C increased by 62.6%. This is because the cooling tower with a baffle of 35 holes causes the water droplets that pass through the baffle to split into more and more so that the heat transfer rate is higher.
{"title":"Studi Eksperimental Pengaruh Konfigurasi Penampang Sekat Terhadap Kinerja Novel Cooling Tower Prototype","authors":"Dedi Afandi, Ahmad Syuhada, Ratna Sary, Z. Zulfan, Asra Yufandi","doi":"10.35308/jmkn.v8i2.6190","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6190","url":null,"abstract":"Cooling towers are widely applied in industries such as power plants and oil refineries, where the equipment produces excess heat that needs to be removed. The effect of baffles configuration on the performance of the novel cooling tower prototype was studied experimentally. The configuration of the baffles used is the baffle section without holes, the baffle section with 15 holes, the baffle section with 25 holes, and the baffle section with 35 holes. The water inlet temperature was varied, namely 55⁰C, 75⁰C, and 90⁰C. water is flowed from the main reservoir to the upper reservoir of the cooling tower using a pump, and water from the upper reservoir falls on the baffles of the cooling tower. Inlet water temperature, outlet water temperature, and water temperature at each baffle were measured using a thermocouple. The results showed that the cooling tower with a baffle of 35 holes produced the most optimal performance. The heat transfer rate produced by the cooling tower with a 35-hole baffle at an inlet temperature of 55⁰C is 624.64 Watts. At the water inlet temperature of 75⁰C, the average heat transfer rate produced by the cooling tower with a 35-hole baffle increased by 42.6%. The average heat transfer rate produced by a cooling tower with a 35-hole baffle at a water inlet temperature of 90⁰C increased by 62.6%. This is because the cooling tower with a baffle of 35 holes causes the water droplets that pass through the baffle to split into more and more so that the heat transfer rate is higher.","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128674795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuniar Anis Budiharja, Seno Darmanto, W. Mangestiyono
Fix the Steering Roller, Where the purpose of making this tool is to prevent mistracking on the Belt Conveyor. The manufacture of this tool was carried out considering the need for PLTU Nagan Raya 2 x 110 MW. PLTU itself is a coal-fired power plant where all coal needs from the Jetty to the Bunker are transported using a Belt Conveyor. In fact, when transporting coal using a Belt Conveyor, there are a lot of coal spills on the Belt side so that it really interferes with the work process of the conveyor belt itself. The spill was caused by a tilted conveyor belt or it could be called mistracking. Therefore, the manufacture of this tool is a solution to prevent mistracking where the installation of this tool is very easy and does not interfere with the existence of the Belt Conveyor equipment itself.
固定转向辊，制作此工具的目的是防止带式输送机上的错误跟踪。该工具的制造是考虑PLTU Nagan Raya 2 x 110 MW的需求而进行的。PLTU本身是一个燃煤电厂，从码头到煤仓所需的所有煤炭都使用带式输送机运输。事实上，在使用带式输送机运输煤炭时，输送带一侧会有大量的溢煤，以至于它确实干扰了输送带本身的工作过程。泄漏是由倾斜的传送带引起的，或者可以称为误运。因此，该工具的制造是一种解决方案，以防止错轨，其中该工具的安装是非常容易的，不干扰存在的带式输送机设备本身。
{"title":"RANCANG BANGUN ALAT FIXED STEERING ROLLER UNTUK MENCEGAH MISTRACKING PADA BELT CONVENER","authors":"Yuniar Anis Budiharja, Seno Darmanto, W. Mangestiyono","doi":"10.35308/jmkn.v8i2.6303","DOIUrl":"https://doi.org/10.35308/jmkn.v8i2.6303","url":null,"abstract":"Fix the Steering Roller, Where the purpose of making this tool is to prevent mistracking on the Belt Conveyor. The manufacture of this tool was carried out considering the need for PLTU Nagan Raya 2 x 110 MW. PLTU itself is a coal-fired power plant where all coal needs from the Jetty to the Bunker are transported using a Belt Conveyor. In fact, when transporting coal using a Belt Conveyor, there are a lot of coal spills on the Belt side so that it really interferes with the work process of the conveyor belt itself. The spill was caused by a tilted conveyor belt or it could be called mistracking. Therefore, the manufacture of this tool is a solution to prevent mistracking where the installation of this tool is very easy and does not interfere with the existence of the Belt Conveyor equipment itself.","PeriodicalId":166109,"journal":{"name":"Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125412594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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