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Dandy Nugroho
Universitas Gresik
Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering

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MODIFIKASI OUTLET COAL BUNKER DAN OUTLET COAL FEEDER UNTUK MENGATASI PLUGGING BATUBARA DI PLTU TANJUNG AWAR-AWAR TUBAN Dandy Nugroho; Sunarto
Wahana Teknik Vol 6 No 1 (2017): Wahana Teknik
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Pertumbuhan penduduk yang pesat selalu diimbangi dengan tuntutan akan kebutuhan primer dan sekunder, sehingga konsumsi manusia akan sesuatu semakin kompleks mengingat kebutuhan manusia akan listrik semakin bertambah. PT. Perusahaan Listrik Negara (PLN) sebagai satu-satunya perusahaan penyedia energi listrik di indonesia dituntut untuk dapat menyediakan energi listrik yang murah dan handal.Kebutuhan energi listrik di Indonesia mengalami peningkatan yang sangat pesat ditandai dengan pertumbuhan industri yang terus meningkat, Permintaan konsumsi energi tersebut perlu disertai dengan pembangunan pusat-pusat listrik yang nantinya akan dikelola oleh swasta maupun pemerintah, proyek percepatan 10.000 MW  dan proyek 35.000 MW yang diadakan oleh pemerintah merupakan salah satu program usaha memenuhi kebutuhan energi tersebut, Salah satu proyek percepatan 10.000 MW adalah pembangunan PLTU Tanjung Awar-Awar yang terletak di Jl. Tanjung Awar-Awar Kecamatan  Jenu Kabupaten Tuban.PLTU Tanjung Awar-Awar dengan beban maksimal 2 x 350 MW pada bulan Februari 2014 memasuki fase Commercial on Date (COD) maka PLTU Tanjung Awar-awar perlu mengoperasikan unit dengan kehandalan dan kinerja yang memenuhi kontrak kinerja perusahaan. Saat ini PLTU Tanjung Awar-Awar memiliki 6 pulverizer system, dan masing masing pulverizer memiliki tanggungan beban 70 MW. Masing-masing pulverizer system terdiri dari beberapa peralatan utama diantaranya coal bunker, coal feeder dan coal mill.Permasalahan yang terjadi adalah seringnya terjadi plugging batubara. Plugging ini sering sekali terjadi pada outlet coal bunker, outlet coal feeder. Intensitas terjadinya plugging ini ± 4 kali setiap shift atau ± 4 kali dalam setiap 8 jam. Plugging batubara ini apabila tidak segera teratasi dalam 600 detik dapat menyebabkan coal mill trip dan unit derating. Saat ini pada masing-masing coal bunker terdapat dredging yang digunakan untuk mengatasi plugging batubara tersebut, tetapi adanya dredging ini kurang efektif.Berdasarkan hasil analisa, penyebab terjadinya plugging batubara adalah sistem dredging kurang optimal, dan kualitas batubara itu sendiri. Saat ini untuk mengatasi plugging batubara telah dilakukan berbagai cara diantaranya penambahan helper untuk memukul outlet coal bunker, modifikasi dredging, modifikasi inlet coal feeder dan pembuatan tombak plugging. Perbaikan untuk mengatasi plugging batubara tersebut juga dinilai kurang efektif karena plugging batubara tetap masih terjadi dan memunculkan permasalahan baru, yaitu menambah beban kerja operator, membahayakan keselamatan kerja operator dan pengeluaran biaya rutin untuk pembayaran helper plugging.Permasalahan inilah yang melandasi dilakukannya Modifikasi outlet coal bunker dan outlet coal feeder untuk mengatasi plugging batubara dan mencapai daya mampu terbaik PLTU Tanjung Awar-awar.Kata kunci : Coal Bunker, modifikasi, coal feeder
STUDI HARGA AIR PADA BENDUNGAN SELOREJO KECAMATAN NGANTANG KABUPATEN MALANG Dandy Nugroho
Wahana Teknik Vol 2 No 1 (2013): Wahana Teknik
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Banyaknya sedimen dari hulu sungai yang menumpuk pada Bendungan Selorejo Kecamatan Ngantang Kabupaten Malang menjadi masalah yang harus ditanggulangi. Tumpukan sedimen tersebut mengakibatkan tampungan air pada bendungan berkurang, sehingga mengurangi kinerja pasokan pembangkit listrik tenaga air dan irigasi untuk masyarakat. Studi ini dilakukan untuk mengetahui berapa rupiah harga jual air untuk pembangkit listrik yang harus dibayar oleh PJB dan harga jual air untuk irigasi yang nantinya akan ditanggung oleh petani untuk biaya operasional dan pemeliharaan Bendungan Selorejo.Penelitian dimulai dengan menganalisa besar biaya–biaya yang ada, yakni terdiri dari biaya konstruksi awal pembangunan, biaya PLTA, biaya operasional dan pemeliharaan rutin serta biaya echosounding. Setelah itu dilakukan analisa manfaat yang pada akhirnya menghasilkan analisis ekonomi yang terdiri dari B/C, B-C, IRR, dan Analisa sensitivitas dengan tingkat suku bunga 11%.Menurut data yang diperoleh, harga air pada alternatif 1 yaitu berdasarkan Rencana Kerja Operasional Perusahaan (RKOP) pada tahun 2009 secara ekonomi mengalami kerugian, dengan harga PLTA sebesar Rp.72,6 per kWh dan pada kondisi eksisting irigasi tidak dikenakan biaya. Karena harga air pada alternatif 1 (RKOP) secara ekonomi tidak layak, maka dilakukan alternatif 2 untuk menaikkan harga air agar tidak mengalami kerugian (dilihat dari nilai B/C > 1). Dengan mempertimbangkan segi ekonomi konsumen, dimana pada alternatif 2 memiliki nilai IRR dan B/C terbesar dan memberikan manfaat yang maksimal, maka setelah melalui analisis ekonomi, harga air yang layak adalah sebagai berikut: 1) Harga jual air untuk PLTA sebesar Rp. 414,00 per kWh dan harga jual air untuk irigasi sebesar Rp. 200,00/m3 pada kondisi normal atau kondisi yang paling mínimum, dengan nilai B/C > 1, B-C = Rp. 50.794.386.096, IRR = 11,1%.Kata Kunci: harga air, B-C, B/C, IRR, dan Analisa Sensitivitas
ANALISIS EFISIENSI WAKTU PELAKSANAAN PROYEK PEMBANGUNAN RUMAH DINAS KARYAWAN RS. IBNU SINA GRESIK MENGGUNAKAN METODE CPM Dandy Nugroho; Akhmad Andi Saputra; Ervina Selawatin Kurdi
Wahana Teknik Vol 7 No 2 (2018): Wahana Teknik
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Dalam suatu kondisi pemilik proyek menginginkan proyek selesai lebih awal dari rencana semula dikarenakan rumah dinas tersebut akan segera ditempati oleh karyawan RS. Ibnu Sina sebelum pergantian tahun 2018, akan tetapi terdapat keterlambatan pekerjaan, Oleh karena itu diperlukan analisis penjadwalan proyek sehingga dapat diketahui berapa durasi percepatan yang dapat dilakukan agar proyek tersebut dapat diselesaikan tepat waktu. Penelitian ini menggunakan metode CPM (Critical Path Method), percepatan durasi kegiatan hanya dilaksanakan pada pekerjaan yang kritis saja dengan target waktu penyelesaian sesuai kontrak awal pekerjaan. Berdasarkan hasil analisis penjadwalan ulang (rescheduling) dengan metode CPM (Critical Path Method) dihasilkan kesimpulan bahwa waktu yang dapat dipercepat ialah 25 hari kalender dengan durasi total pelaksanaan 66 hari kalender. sedangkan apabila tidak dikendalikan maka waktu penyelesaian sebesar 91 hari kalender. Kata kunci: CPM, percepatan, reschedulling
Pengaruh Campuran Abu Sekam Padi Terhadap Kualitas Bata Merah di Desa Tegalombo, Kecamatan Dukuhseti, Kabupaten Pati Dandy Nugroho; Akhmad Andi Saputra; Kuswoyo Kuswoyo
Wahana Teknik Vol 8 No 2 (2019): Wahana Teknik
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Penelitian ini bertujuan untuk mengetahui pengaruh komposisi terbaik abu sekam padi terhadap pandangan luar, porositas, susut bakar, kadar garam, daya serap air dan kuat tekan batu bata merah.Metode penelitian ini dilakukan dengan penambahan abu sekam dengan komposisi 5%, 10% dan 15% dengan pencampuran tanah liat dari persawahan. Hasil campuran tanah liat, abu sekam padi dan air dicetak dan dikeringkan secara alami selama 2 hari 1 malam, dan dilanjutkan pembakaran selama 3 x 24 jam. Pengujian dilakukan sesuai SNI 15-2094-2000 tentang bata merah.Hasil penelitian dengan campuran komposisi 5%, 10% dan 15 dapat menunjukkan perubahan dari segi pandangan luar, porositas, susut bakar, daya serap, dan kuat tekan batu bata. Pada komposisi 15%, dari segi pandangan luar terjadi keretakan 8%, dan daya serap air sebesar 20,2% yang melebihi dari standart SNI 15-2094-2000. Pada penelitian kuat tekan dari ketiga sampel dengan komposisi 5%, 10%, dan 15% dengan hasil 2,08%, 1,80%, dan 1,68% menyimpulkan tidak sesuai dengan SNI 15-2094-2000. Dari keseluruhan penelitian ini didapatkan komposisi terbaik untuk campuran abu sekam padi ialah pada komposisi 5%-10%.Kata Kunci: Batu Bata, Abu Sekam Padi, Visual, Susut Bakar, Porositas, Kadar Garam, Daya Serap Air, Kuat Tekan
Perencanaan Perkerasan Lentur Jalan Raya Dengan Metode Analisis Komponen Bina Marga 1987 (Studi Kasus Ruas Jl. Raya Banjarsari-Cerme Kabupaten Gresik) Dandy Nugroho; Akhmad Andi Saputra; Muchammad Dian Nurdianto
Wahana Teknik Vol 9 No 1 (2020): Wahana Teknik
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Banjarsari Highway is an arterial road in the primary road network system that connects Surabaya, Krian, Sidoarjo, Mojokerto and Lamongan areas. Banjarsari-Cerme Highway uses flexible pavement consisting of basic soil layer, bottom foundation layer, top foundation layer and surface layer. The arrangement of these layers is generally used on roads that have a fairly high volume of traffic. Over time, the number of vehicles passing is increasing and eventually causing road damage in a relatively short period of time. Therefore, it is very important to make road improvements in accordance with the Average Daily Traffic Volume (VLHR) and the composition of passing vehicles. This study will calculate and plan the type of pavement that is feasible according to the age of the planned plan. To supporting this study, several data are needed such as: traffic volume data, rainfall data, CBR data, and secondary data obtained from the Public Works Office and Gresik Regency Transportation Office. From the data obtained, it is then processed and analyzed on the calculation of pavement bending new roads with Bina Marga standards. Planning in this study uses flexible pavement analysis in accordance with the Guidelines for Thick Planning of Pavement Pavement with Component Analysis Method (SKBI-2.3.26.1987) and combined with AASHTO method 1993. The results of this study are: (1) The average daily traffic (LHR) based on the age of the 10-year plan on Banjarsari-Cerme road is 29,418 vehicles per day. (2) The thickness of the planned bending pavement on Banjarsari-Cerme road in Gresik regency based on the analysis method of the 1987 Bina Marga SKBI component of 97.50 cm with the following details: a) Surface layer (surface course) used Laston MS-744 with a thickness of 17.50 cm with details of a wear layer AC-WC 7.50 cm thick and foundation layer AC-BC as thick as 10 cm. b) The base course is used 100% CBR 100% grade with a thickness of 35 cm. c) The bottom foundation layer (subbase course) is used sirtu (class B) CBR 50% with a thickness of 45 cm. Keywords: Average Daily Traffic, Bending Pavement Layer, Component Analysis and AASHTO Method.
Perbandingan Estimasi Anggaran Biaya Antara Harga SNI Dengan Harga Kontraktor Pada Proyek Pembangunan Pagar di Kandangan Surabaya Akhmad Andi Saputra; Dandy Nugroho; Feri Sukmana
Wahana Teknik Vol 9 No 1 (2020): Wahana Teknik
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The implementation of a construction project is a mechanical series of activities or works that are complex, multi-layered and interdependent. Building construction activities in the field of construction, we need a basic means of calculation of Principal Unit Price Analysis (AHSPK). Contractors are more likely to calculate the price of the work unit based on their own analysis based on previous experience in completing a construction work, although it is inseparable from SNI analysis (Indonesian National Standardization). The research method in analyzing the Budget Plan (RAB), namely the SNI and Contractor Calculation Methods. From the calculation of each analysis of the existing budget plan, the results obtained are a comparison of the budget plan between the SNI method with the Contractor Method. A more economical cost budget plan using the Contractor Method is IDR 548,564,455.00 while the results of the analysis of the SNI cost budget plan is IDR 1,151,860,112.11. Keywords: Budget, Comparison, Contractor, Cost, Estimation, Price, SNI.
Analisis Balok dan Kolom Struktur Beton (Studi kasus café di Jl. Manunggal, Desa Gedongombo, Kecamatan Semanding, Kabupaten Tuban) Dandy Nugroho; Akhmad Andi Saputra; Dedi Agung Cahyono
Wahana Teknik Vol 9 No 2 (2020): Wahana Teknik
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Structural design is an important element in the construction of a building in order to produce a strong, safe and economical building. Overall, the building structure consists of two parts, namely the upper structure (in the form of floors, beams, columns, walls and roofs) and the lower structure (in the form of foundations and sloof beams). Columns and beams are the structure of the building frame, therefore it is very important, so that dimensions and use of reinforcement that are safe and economical must be planned. Changing the function of an office building into a café building needs to recalculate the beam and column structure. In the load regulation, the live load value of café buildings is greater than that of office buildings, so it is necessary to recalculate the dimensions of the beam and column structures so that they are able to withstand the existing loads in the cafe building. This study analyzes the beams and columns of concrete structures using a load-bearing frame system with tools from the STAADPro program according to SNI-2847-2013 regarding structural concrete requirements for buildings. The conclusion of this research is that the beam section uses a size of 300 x200mm and the column section uses a size of 300 x 300mm. Column section uses 8 Ø12 bending reinforcement, the support beam uses 2 Ø12 upper reinforcement 3 Ø12 lower reinforcement, field beam uses 7 Ø12 upper reinforcement 4 Ø12. Keywords: Analysis, Beams, Columns, Concrete, Structure.
Analisis Struktur dan Perencanaan Ketahanan Gempa (SNI 1726:2012) Warehouse PT. X di Gresik Akhmad Andi Saputra; Dandy Nugroho; Ahmad Muwafiqudinulhaq
Wahana Teknik Vol 9 No 2 (2020): Wahana Teknik
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Warehouse is a building to store a variety of necessary products for a company, it could be said that warehouse is collection point and starting point of the goods that will be distributed to the retailer or directly to the consumer. In cases that took place at the warehouse in PT.X is a building which had height of 26 meters and span of 25 meters that has earthquake-prone and wind loads. This makes researcher need to do structure analysis and planning of warehouse resilience of PT.X in Gresik.This study uses SNI 1726:2012 for planning earthquake resistance of building and non-building structures. The step of structure analysis of rafters, gordings, beams and columns as follows: 1. Input data into STAAD pro (structure modelling), 2. Control the strength of rafter structures, gordings, beams and columns using the largest external force data based on calculations from STAAD pro.The results of this study are: 1. The structural resistance to combined loads according to SNI 1726:2012 shows an indication of the inability of the steel profile on the H 350 x 175 rafter and on the H 250 x 125 beam with the actual value of the allowable ratio more than 1.00, 2. The rafter profile is replaced with I 450 x 175 x 11 profile which has a ratio value of 0.7818 and the beam profile is replaced with H 250 x 250 x 9 x 14 which has a ratio value of 0.1996, both steel profiles have indicated pass result. Keywords: Analysis, STAAD Pro, Steel, Structure.
Optimasi Waktu Pelaksanaan Pembangunan Ruang Praktik Siswa SMK Negeri 1 Duduksampeyan dengan Metode PERT Bowo Leksono; Dandy Nugroho; Eva Indah Yanti
Wahana Teknik Vol 9 No 2 (2020): Wahana Teknik
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Implementation of work on a project requires not only reliable human resources, but also a good management. A construction project can be said to be successful if it is able to meet its objectives that is completed at the specified time, in accordance with the allocated costs and meet the required quality. Or failure of the implementation is often caused by lack of planned project is not effective and efficient, this will cause delays, lack of quality work, and too large funding is not in accordance with initial planning. In this paper the author uses planning techniques with network planning as one of the models that will be used in the implementation of the student practice room development project at SMK Negeri 1 Duduksampeyan. The planning technique used by the author is PERT. This technique is used to optimize the construction project construction where the author examines issues related to time. By comparing the actual situation and the plan, it can be seen whether the progress of the relevant project is on schedule or delayed. From the research that has been done, it is obtained using a time schedule. Based on the analysis using the PERT method the result is the opportunity to achieve the target time for completion of the project from 90 days to 72 days is 99.75% and the project cost increased to Rp 423,380,476.82 from the original planned cost of Rp 422,066,726.74. There was a reduction in project time for 18 days and an increase in costs of Rp 1,313,750.08. Keywords: network, optimation, PERT, planning.
Perencanaan Ulang Sistem Saluran Drainase di Kecamatan Menganti Kabupaten Gresik Dandy Nugroho; Bowo Leksono; Irani Sholikhah
Wahana Teknik Vol 10 No 1 (2021): Wahana Teknik
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Sub district Menganti is one of sub districts of the district of Gresik. The region during the rainy season is often suffered flooding. The flooding problem is likely to arise as result of inadequate channels capacity, changes in land use, drainage network system which is not connected properly, and the lack of public awareness of the importance of maintaining the drainage channels, as well. The final project aims to design the drainage system in the sub district of Menganti-Gresik. Drainage is also interpreted as an effort to control groundwater quality in relation to salinity. The purpose of this study is to plan drainage channels in the Menganti District, Gresik Regency. Data or information used is secondary data obtained from the Public Works Department and primary data obtained from direct surveys in the field. The data processing method uses manual calculation in accordance with the rational method for calculating rain discharges, and the manning formula for channel discharges. The conclusions that can be drawn from this research are: 1) Floods that occur are caused by many areas that do not have a well-integrated drainage network system. 2) The design flow velocity for secondary drainage is 1.93–3.19 m/s. The dimensions of the secondary drainage channel are rectangular with variations in width 0.94–2.28 m and channel height 0.47–1.14 m. 3) The design flow velocity for primary drainage is 2.4–4.5 m/s. The dimensions of the primary drainage channel are rectangular with variations in width of 0.91–1.62 m and channel height 0.5–0.8 m. Keywords: drainage, gresik, menganti, re-planning
Co-Authors Ahmad Muwafiqudinulhaq Akhmad Andi Saputra Bana Ervadius Bowo Leksono Dedi Agung Cahyono Ervina Selawatin Kurdi Eva Indah Yanti Feri Sukmana Irani Sholikhah Kuswoyo Kuswoyo Muchammad Dian Nurdianto Sunarto Titik Suhartatik