Indonesian Journal of Science and Technology最新文献_第10页

Bearing Failure Analysis on Gearbox Forced Draft Fan at LNG Plant LNG厂齿轮箱抽风机轴承失效分析

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12756

Edward Rangga Pratama, A. F. H. Mukhammad

{"title":"Bearing Failure Analysis on Gearbox Forced Draft Fan at LNG Plant","authors":"Edward Rangga Pratama, A. F. H. Mukhammad","doi":"10.17509/IJOST.V3I2.12756","DOIUrl":"https://doi.org/10.17509/IJOST.V3I2.12756","url":null,"abstract":"Boilers Forced Draft Fan has a gearbox reducer to reduce speed from steam turbine as a driver and fan as the driven. Based on Predictive Maintenance Group at Machinery and Heavy Equipment Section, it was found that gearbox has high vibration and noise when boilers load on 195 Ton/Hr (Max Load 295 Ton/hr). Vibration Analysis indicates that the source of vibration comes from bearings with peak value 0.572 in/sec at gearbox high speed outboard vertical and 0.593 in/sec at gearbox high speed outboard horizontal (Max Allowance 0.50 in/sec). Lubrication analysis using X-ray Flourescence method, to see wear particle on lubricating oil showed that Tin(Sn) content is very high 203.62 mg/L (maximum allowance for Tin(Sn) at gearbox is 20mg/L), but wear debris are not found in lubricating oil. Gearbox disassembly found that high speed and low speed bearings suffered severe corrosion. Corrosion at bearings are caused by water contamination on lubrication oil, it comes from steam leak due to carbon ring failure at steam turbine which is steam turbine bearing lubrication and gearbox lubrication get into one lubrication system. After Bearings replaced with a new one, vibration analysis shown improved vibration conditions 0.084 in/sec at gearbox high speed outboard vertical and 0.066 in/sec at gearbox high speed outboard horizontal. In conclucion, high vibration and noise at gearbox reducer were caused by bearings failure due to severe corrosion, and water contamination on lubrication oil for gearbox due to carbon ring failure on steam turbine.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91286079","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}

引用次数: 1

A Review on Phase Change Materials Incorporation in Asphalt Pavement 沥青路面相变材料掺入研究进展

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12762

I. Kumalasari, M. Napiah, M. Sutanto

引用次数: 4

The Effect of Seaweed Extract (Sargassum Sp) Used as Fertilizer on Plant Growth of Capsicum Annum (Chilli) and Lycopersicon Esculentum (Tomato) 海藻提取物(马尾藻Sp)肥对辣椒和番茄植株生长的影响

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12755

S. Fatimah, H. Alimon, N. Daud

{"title":"The Effect of Seaweed Extract (Sargassum Sp) Used as Fertilizer on Plant Growth of Capsicum Annum (Chilli) and Lycopersicon Esculentum (Tomato)","authors":"S. Fatimah, H. Alimon, N. Daud","doi":"10.17509/IJOST.V3I2.12755","DOIUrl":"https://doi.org/10.17509/IJOST.V3I2.12755","url":null,"abstract":"Seaweeds, mainly brown species, have long been used as soil fertilizers and have several advantageous effects of spraying their crude extracts on plant growth. Unlike chemical fertilizer, biofertilizers derived from seaweeds or other organisms are usually biodegradable, non-toxic, non-polluting and non-hazardous to humans, animals and birds which will benefit to agriculture sector. In this study, four different concentrations (0.50; 1.00; 2.50; and 5.00 mg/L) of four different solvents extract (hexane, dichloromethane, methanol and water) were used to determine the effect on in vitro seed germination of Capsicum annum and Lycopersicon esculentum. The results showed that concentration 2.50 mg/L can be classified as optimum concentration for seedling development of Lycopersicon esculentum and this study has proven that DCM is the effective extract solvent that result in promoting hypocotyl and root growth of tomato plant. For Capsicum annum, hexane extracts solvent of Sargassum sp. Was found to be more effective than other extracts in promoting seedlings development. Phytochemical screening of Sargassum sp. exhibited the presence of alkaloids and terpenoids as the dominant compenants in all extract.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85711763","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}

引用次数: 8

The Influence of Hot Forming on the Microstructure and Corrosion Behaviour of AZ31B Magnesium Alloys 热成形对AZ31B镁合金组织及腐蚀行为的影响

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12758

J. Alias, N. S. Mohamed, M. Ishak, Xiorong Zhou, G. Thompson

引用次数: 0

Working Volume and Milling Time on the Product Size/Morphology, Product Yield, and Electricity Consumption in the Ball-Milling Process of Organic Material 在有机材料球磨过程中，工作量和球磨时间对产品尺寸/形貌、产品成品率和电力消耗的影响

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12752

A. Nandiyanto, Riezqa Andika, Muhammad Aziz, L. Riza

{"title":"Working Volume and Milling Time on the Product Size/Morphology, Product Yield, and Electricity Consumption in the Ball-Milling Process of Organic Material","authors":"A. Nandiyanto, Riezqa Andika, Muhammad Aziz, L. Riza","doi":"10.17509/IJOST.V3I2.12752","DOIUrl":"https://doi.org/10.17509/IJOST.V3I2.12752","url":null,"abstract":"Analysis of ball-milling process under various conditions (i.e. working volume, milling time, and material load) on the material properties (i.e. chemical composition, as well as particle size and morphology), product yield, and electricity consumption was investigated. Turmeric (curcuma longa) was used as a model of size-reduced organic material due to its thermally and chemically stability, and fragile. Thus, clear examination on the size-reduction phenomenon during the milling process can be done without considering any reaction as well as time-consuming process. Results showed that working volume is prospective to control the characteristics of product. Working volume manages the shear stress and the collision phenomena during the process. Specifically, the lower working volume led to the production of particles with blunt-edged morphology and sizes of several micrometers. Although working volume is potentially used for managing the final particle size, this parameter has a direct impact to the product yield and electricity consumption. Adjustment of the milling time is also important due to its relation to breaking material and electrical consumption.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76096611","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}

引用次数: 24

Numerical Simulation of Natural Convection in the Air Gap of a Vertical Flat Plat Thermal Solar Collector with Partitions Attached to Its Glazing 玻璃上附隔板的立式平板太阳能集热器气隙内自然对流数值模拟

Indonesian Journal of Science and Technology Pub Date : 2018-08-30 DOI: 10.17509/IJOST.V3I2.12753

Adel Laaraba, A. Khechekhouche

{"title":"Numerical Simulation of Natural Convection in the Air Gap of a Vertical Flat Plat Thermal Solar Collector with Partitions Attached to Its Glazing","authors":"Adel Laaraba, A. Khechekhouche","doi":"10.17509/IJOST.V3I2.12753","DOIUrl":"https://doi.org/10.17509/IJOST.V3I2.12753","url":null,"abstract":"Heat transfer in the air gap of a vertical flat plat thermal solar collector containing partitions attached to its glazing has been studied numerically. The absorber and the glazing are kept at constant and different temperatures, while the vertical walls (insulation) were kept adiabatically. A conjugate formulation was used for mathematical formulation of the problem and a computer program based on the control volume approach and the simpler algorithm was used. The main aim of the current paper is to study numerically the effects of number of fins and their length on the air pattern and heat transfer. Experimental results showed that interesting phenomena happened, especially in the heat transfer process. It was observed that the heat transfer rate through the air gap is affected greatly and can be controlled by the number of attached fins to the glazing of the solar collector as well as the fin lengths, and the addition of partitions reduces the heat losses by convection by 60%. This study will brings good advantages for further uses, especially related to the heat transfer phenomena in the solar applications.","PeriodicalId":37185,"journal":{"name":"Indonesian Journal of Science and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78514492","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}

引用次数: 13

Third Version of Weak Orlicz–Morrey Spaces and Its In-clusion Properties 第三版弱Orlicz-Morrey空间及其包含性质

Indonesian Journal of Science and Technology Pub Date : 2018-08-05 DOI: 10.17509/IJOST.V4I2.18182

A. Masta, S. Fatimah, M. Taqiyuddin

引用次数: 4