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All Journal Infotekmesin Jurnal Mekanik Terapan JURNAL POLI-TEKNOLOGI
Fitri Wijayanti
Politeknik Negeri Jakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Analisis Kebocoran Tube Outlet Header LP Evaporator HRSG dengan Metode RCFA Muhammad Daffa; Arifia Ekayuliana; Fitri Wijayanti
Jurnal Mekanik Terapan Vol 1 No 1 (2020): Mei 2020
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v1i1.3329

Abstract

Ditemukan adanya kebocoran pada tube outlet header LP evaporator HRSG. Kebocoran tersebut terjadi di lokasi pipa masuk ke header sisi keluar dan pada belokan pipa menuju header. Kebocoran pada pipa dapat menyebabkan steam drum tidak mampu memenuhi syarat minimum level air sehingga mengakibatkan sistem proteksi pada HRSG memberikan sinyal untuk trip dan sistem menjadi open cycle yang berdampak pada penurunan daya mampu atau derating. Hal tersebut apabila tidak ditangani maka dapat menyebabkan kerugian, dimana seharusnya gas hasil pembakaran dapat termanfaatkan secara maksimal. Untuk mengatasi hal tersebut, diperlukan metode pemecahan masalah sampai ke akarnya menggunakan Ishikawa Diagram. Penelitian ini bertujuan untuk mengetahui akar penyebab terjadinya kerusakan tube outlet header LP evaporator HRSG dan mengetahui solusi untuk mengatasi kebocoran HRSG agar tidak terulang. Hasil penelitian menunjukkan bahwa dari kajian 5M yang memiliki faktor paling berpengaruh dalam kaitan terjadinya kebocoran adalah karena faktor material; nilai kriteria fleksibilitas pipa melebihi batas yaitu sebesar 0,04, ketebalan pipa telah mendekati batas minimum yaitu sebesar 2,58 mm; pengoperasian fluktuatif, dan management; waktu pemeliharaan melewati batas equivalent operating hour (EOH). Untuk mengatasi kebocoran yang terjadi pada pipa HRSG dapat dilakukan pengecekan terhadap distribusi aliran gas hasil pembakaran, menjaga kualitas air, mengoperasikan HRSG secara base load dan pemeliharaan sesuai EOH.
Root Cause Failure Analysis pada Shutoff Hot Damper Mill Di Pt. Indonesia Power Unit Jasa Pembangkitan Jawa Tengah 2 Adipala Fitri Wijayanti; Nadiyatul Fadhila
Jurnal Mekanik Terapan Vol 3 No 2 (2022): Agustus 2022
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v3i2.4616

Abstract

PT Indonesia Power Unit Power Generation Services Central Java 2 Adipala is one of the suppliers of electrical energy on the islands of Java, Madura and Bali. The main components of PLTU Central Java 2 Adipala are Boilers, Steam Turbines and Generators. The combustion system in the heating process in the boiler requires air, fuel, and heat. Coal as fuel is supplied from coal handling and distributed to the bunker and then through the coal feeder to the Pulvarizer/Mill before going to the combustion chamber. At the time of milling there is a drying, distribution and separation process of coal with foreign objects carried from the mining process so that the coal entering the combustion chamber meets specifications. The milling process is carried out with the help of a Primary Air Fan (PAF) to suck air into the Mill/Pulvarizer. Before entering the Mill/Pulvarizer, the cold primary air and hot primary air are held by the Shut Off Damper, which functions to open and close the PAF airflow to the Mill/Pulvarizer. In the process, there is a possibility of damage/failure from the Shut Off Damper so that the continuity of the process at the Mill/Pulvarizer is disrupted. For this reason, it is necessary to analyze the damage/failure to the Shut Off Damper and solutions
OPTIMALISASI SISTEM PENDINGIN ENGINE CATERPILLAR 3406E MILIK POLITEKNIK NEGERI JAKARTA Fitri Wijayanti; Achmad Fariq; Ali Ardin; Fridho Nova Rianto; Muhammad Zulfadli
Jurnal Poli-Teknologi Vol. 16 No. 3 (2017)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v16i3.973

Abstract

ABSTRACTAn engine can not be separated from the various systems in which is one of them is a cooling system, cooling system is the most important system in supporting the performance of an engine. The cooling system of Caterpillar 3406E engine belonging to Jakarta State Polytechnic is not optimal because the engine uses drum as cooling medium and its maintenance is very minimum; hence it needed optimization process to prevent overheating at the engine.Various solutions can be given such as increasing the amount of water on the drum, adding ice cubes to the drum, or replacing the drum with radiator assy components. Based on experiments and considerations, the solution is to replace the drum component with an assy radiator to prevent overheating of the engine.From the experiment and also analysis to temperature delta value on drum and radiator assy, it can be concluded that by replacing the assy radiator it can be more capable to absorb heat in the cooling water which will absorb heat from the engine combustion than by using the drum. So the 3406E engine owned by State Polytechnic of Jakarta can be operated longer than by using the drum.Keywords: Caterpillar 3406E Engine, Cooling System, Optimization, RadiatorABSTRAKSebuah engine tidak lepas dari berbagai sistem didalamnya salah satunya adalah sistem pendingin, sistem pendingin merupakan sistem yang paling utama dalam menopang kinerja sebuah engine. Engine Caterpillar 3406E milik Politeknik Negeri Jakarta dalam sistem pendinginannya belum optimal karena engine tersebut menggunakan drum sebagai media pendingin dan perawatannya sangat kurang, maka itu diperlukan proses optimalisasi untuk mencegah overheating pada engine tersebut.Berbagai solusi dapat diberikan seperti menambah jumlah air pada drum, menambahkan es batu pada drum tersebut, atau mengganti drum dengan komponen radiator assy. Berdasarkan percobaan serta pertimbangan maka diambil solusi untuk mengganti komponen drum dengan radiator assy untuk mencegah overheating pada engine tersebut.Dari penelitian ini, setelah dilakukan analisis terhadap nilai delta suhu pada drum dan radiator assy maka dapat disimpulkan bahwa dengan penggantian radiator assy dapat lebih mampu dalam menyerap panas pada air pendingin yang telah menyerap panas dari pembakaran engine dibandingkan dengan menggunakan drum. Oleh karena itu, engine 3406E milik Politeknik Negeri Jakarta dapat beroperasi lebih lama dibandingkan menggunakan drum.Kata kunci: Engine Caterpillar 3406E, Optimalisasi, Radiator, Sistem Pendingin
PENGEMBANGAN PERANGKAT PEMBELAJARAN BERBASIS COURSELAB PADA PRINSIP KERJA ENGINE BIDANG KEAHLIAN KENDARAAN RINGAN Imam Wahyudi; Fitri Wijayanti
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2347

Abstract

Development research focused on developing Courselab-based learning aids on the principle of Light Vehicle Engine Expertise which includes Student Books, Student Activity Sheets and Lesson Plans for grade XI SMK students. The model of development used in this research refers to the model of learning aids development of Dick & Carey which consists of three phases, namely (1) identification phase; at this stage the writing of goals and analysis of instructional learning is conducted, identifying initial behaviors and characteristics of the students, (2) development phase; at this stage the Courselab-based learning tools is developed by formulating the goals and the standard reference tests, as well as developing the strategies and the learning aids, (3) testing and evaluation phase. The developed Courselab-based learning aids has been validated by two experts with revision to obtain a result which is fit to use. The tests carried out in three stages, namely one-on-one testing, small group testing conducted at SMK Nasional Makassar to evaluate the practicality of the learning aids and limited testing conducted at SMK Darussalam Makassar to evaluate the practicality and the effectiveness of the learning aids. The research results show that the developed learning aids, after the validation, was declared valid. The learning aids is attributed practical as the students responded positively to the learning aids they used. The learning aids is considered effective as the students responded positively to the learning aids used. It has met the criteria of effectiveness, with the results: (1) student activities have met the predetermined tolerance limits, (2) the teacher activities have fulfilled the observed aspects, and (3) the student learning outcomes on the working engine principle materials have achieved completeness.
KAJIAN KUALITAS PEMBAKARAN TERHADAP PENGGUNAAN FILTER BBM PADA MESIN DIESEL Tatun Hayatun Nufus; Ariek Sulistyowati; Asep Yana; Fitri Wijayanti
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2413

Abstract

The price of oil fuel continues to rise, decreased supplies oil at the other side, those two factors motivate researchers to conduct research related to the efficient use of fuel. Have been made three types of fuel oil which the principle of an electromagnet used a filter, all three made of the coil with a convolution wire as many as 5000 a convolution and diameter of the nucleus of a coil 44.5 mm, 28.5 mm and 17.5 mm, a filter tested in a diesel engine. Testing done in the rpm the ignition is started 1100 until 1700 rpm, by opening throttle % to 60 % from 30%. Testing first one was done by making constant round of 1500 rpm and openings throttle vary from 30 % to 60%, next testing done with the variation of rpm start 1100 rpm until 1700 rpm by making constant valve as 40 % and of 60 % . The purpose of the variations to obtain optimum result against consumption of material fuel ( sfc ) the most little uses. Testing was done in a laboratory material.
Optimalisasi Aliran Turbin Aksial yang Menghasilkan Daya dalam Sistem Siklus Rankine Organik Berdasarkan Studi Numerik Haolia Rahman; Fitri Wijayanti Wijayanti; Gun Gun Ramdlan Gunadi; Albait Malikul Izzat
Infotekmesin Vol 17 No 2 (2026): Infotekmesin: Juli 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/

Abstract

Low-capacity Organic Rankine Cycle (ORC) turbines play an important role in utilizing low- to medium-temperature heat sources. This study aims to investigate the effects of working-fluid inlet temperature and turbine rotational speed on the power output and efficiency of an axial ORC turbine, as well as to determine the operating conditions that provide optimal performance. A Computational Fluid Dynamics (CFD)-based numerical simulation was conducted using SolidWorks Flow Simulation. The turbine analyzed in this study was a single-stage axial turbine equipped with eight half-round blades and operated with R134a as the working fluid. Simulations were performed at an inlet pressure of 2 MPa with inlet temperatures of 80°C, 90°C, and 100°C, and rotational speeds of 1500 rpm and 3000 rpm. The evaluated parameters included mass flow rate, enthalpy change, torque, input power, output power, and turbine efficiency. The simulation results showed that increasing the rotational speed from 1500 rpm to 3000 rpm improved the turbine power output. The highest output power of 14,064 W was achieved at 100°C and 3000 rpm, while the highest efficiency of 10.68% was obtained at 80°C and 3000 rpm. These findings indicate that rotational speed has a significant influence on turbine performance, whereas higher inlet temperatures do not necessarily result in the highest efficiency. The results of this study provide a useful basis for optimizing the design and operating conditions of axial ORC turbines for low-temperature heat recovery applications.
Evaluation of Cooling Tower Performance Based on Range, Approach and Effectiveness Parameters on Geothermal Power Plant Turbine Performance Fitri Wijayanti; Muhammad Ridho Kurnia; Paulus Sukusno
Jurnal Mekanik Terapan Vol 7 No 2 (2026): August 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v7i2.8724

Abstract

This study evaluates the thermal performance of the cooling tower at PT. Geo Dipa Energi Unit Patuha, a 60 MW single-flash geothermal power plant, using cooling-water temperature range, approach, and effectiveness, and examines their statistical relationships with condenser pressure and turbine output power. Operational data were obtained from the plant Distributed Control System (DCS) at two-hour intervals during January–June 2026. After validation, 1,090 of 1,104 records (98.8%) were retained. The cooling-water temperature range, defined as the difference between return and supply temperatures, remained relatively stable (mean 24.65°C, SD 0.24°C). Because range is a temperature difference, it is not itself a measure of heat-rejection rate; the latter requires cooling-water mass flow rate and specific heat according to Q̇ = ṁCp(T1−T2). The approach ranged from 2.38°C to 12.33°C and effectiveness from 66.43% to 91.15%. Wet-bulb temperature was positively associated with cooling-water supply temperature (r = 0.704). Cooling-water supply temperature showed a very strong association with condenser pressure (r = 0.975, R² = 0.951; Vacuum = 5.76T2 − 20.33), while condenser pressure was negatively associated with turbine output power (r = −0.716, R² = 0.512), with an estimated 0.0723 MW decrease per 1 mbara increase. These observational results indicate that absolute cooling-water supply temperature is more directly associated with turbine output than effectiveness alone. The findings should be interpreted as statistical associations rather than causal effects because steam flow, inlet steam conditions, plant load, humidity, fouling, and other operational factors were not simultaneously controlled in the simple regression models.
Co-Authors Achmad Fariq Albait Malikul Izzat Ali Ardin Ariek Sulistyowati Arifia Ekayuliana Asep Yana Fridho Nova Rianto Gunadi, Gun Gun Ramdlan Imam Wahyudi Muhammad Daffa Muhammad Ridho Kurnia Muhammad Zulfadli Nadiyatul Fadhila Paulus Sukusno Rahman, Haolia Tatun Hayatun Nufus