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Kajian Pemasangan Pipa Air Bersih Melayang dalam Air Laut untuk Mendukung Perkembangan Pariwisata di Nusa Ceningan dan Lembongan Made Suarda; I Gusti Komang Dwijana
Jurnal Energi Dan Manufaktur Vol 13 No 1 (2020)
Publisher : Department of Mechanical Engineering, University of Udayana

ir bersih merupakan kebutuhan dasar untuk kehidupan manusia. Demikian pula aktivitas kehidupan di pulau Nusa Ceningan dan Lembongan membutuhkan air bersih. Mengingat kedua pulau tersebut merupakan destinasi wisata pavorit dan berkembang pesat, maka disamping untuk kehidupan masyarakat sehari-harinya (7153 jiwa), ketersediaan air bersih sangat dibutuhkan untuk hotel dan aktivitas pendukung pariwisata. Namun, di kedua pulau tersebut tidak tersedia sumber air bersih. Oleh sebab itu salah satu alternative solusinya adalah menyalurkan air bersih dari pulau terdekatnya yaitu Nusa Penida. Di Nusa Penida terdapat dua mata air yang cukup besar yaitu mata air Guyangan (78 lt/dt) dan Penida (173 lt/dt). Proyeksi kebutuhan air dengan debit harian maksimum 30 lt/dt. Pada kajian ini, kebutuhan air bersih tersebut akan disuplai dari mata air Penida. Pada umumnya pemasangan pipa menyebrang laut dipasang pada dasar laut (seabed) atau mengapung di permukaan air laut. Namun lautan antara pulau Nusa Penida dan Ceningan merupakan jalur pelayaran kapal, dan lautan tersebut merupakan palung curam dengan kedalaman 200 meter maka kedua metode pemasangan pipa tersebut tidak dapat dilakukan. Oleh sebab itu satu-satunya cara adalah memasang pipa melayang pada kedalaman 20 meter di bawah permukaan air laut. Pipa akan menerima berbagai macam gaya-gaya luar akibat tekanan hidrostatis air laut, hydrodinamik arus dan gelombang. Sesuai hasil kajian, pipa menyeberang lautan dengan bentang 1500 meter terdiri dari tiga pipa HDPE berdiameter 140 mm yang dipasang parallel. Setiap pipa menerima gaya hidrodinamik pada arah vertikal 64.050 Newton arah keatas dan horizontal 71.550 N/m. Oleh sebab itu untuk mengamankan pipa dari beban gaya-gaya tersebut maka pipa diikat pada jembatan sling baja stainless berdiameter 110 mm. Disamping itu pada setiap jarak 6 meter pada sling jembatan pipa tersebut dipasangi beton ballast load 350 kg dengan sling penggantung diameter 6 mm. Metode ini pelaksanaannya rumit dan membutuhkan berbagai peralatan pendukung sehingga dibutuhkan biaya kontruksi yang mahal pula. Namun, hal ini perlu dilakukan untuk menyediakan air bersih di Nusa Ceningan dan Lembongan guna meningkatkan perkembangan pariwisata di daerah tersebut. Clean water is a basic need for human life. Likewise the activities of life on the island of Nusa Ceningan and Lembongan need clean water. Considering that the both islands are favorite tourist destinations and are growing rapidly, in addition to the daily life of the community (7153 people), the availability of clean water is needed for hotels and tourism supporting activities. However, on both islands there are no sources of clean water. Therefore, one alternative solution is to distribute clean water from the nearest island, Nusa Penida. On the Nusa Penida there are two fairly large springs, namely the Guyangan spring (78 lt/sec) and Penida (173 lt/sec). The projection of water demand until 2043 at daily maximum capacity is 30 lt/sec. In this study, the need for clean water will be supplied from the Penida spring. In general, the installation of crossing pipeline is installed on the seabed or floating on the sea water surface. However, the sea between the Nusa Penida and Ceningan islands is a ship's shipping lane, and the sea is a steep trough with a depth of 200 meters, so the both methods of mounting the pipe cannot be performed. Therefore the only way is drifting the pipeline at a depth of 20 meters below sea level. The pipe will receive various external forces due to the hydrostatic pressure of seawater, hydrodynamic of currents and waves. According to the results of the study, the pipeline crossing the ocean with a span of 1500 meters consists of three HDPE pipes with a diameter of 140 mm which are installed parallel. Each pipe receives hydrodynamic forces that are vertical force of 64,050 Newton in upper direction and horizontal force of 71,550 Newton. Therefore to secure the pipeline from the load of these forces, the pipe is tied to a stainless steel sling bridge with a diameter of 110 mm. Besides that, at every distance of 6 meters the pipe bridge sling is fitted with a ballast concrete load of 350 kg with a hanging sling of 6 mm. This method is complicated and requires a variety of supporting equipment, so its construction cost is expensive. However, this should be done to provide clean water in the Nusa Ceningan and Lembongan in order to increase the development of tourism in the area.

Peningkatan konduktivitas termal lemak sapi sebagai bahan PCM dengan menambahkan arang sekam padi I.M. Astika; I.N.S. Winaya; I.D.G.A. Subagia; I.K.G. Wirawan; I.G.K. Dwijana; I.G.K. Sukadana
Dinamika Teknik Mesin Vol 11, No 1 (2021): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Phase change material (PCM) is a material that can absorb and store energy and can release it based on the principle of latent heat energy storage. Beef tallow is one of the materials that can be used as PCM but its low thermal conductivity is around 0.181 W/mK. Hence, thermal conductivity is considered an important factor in the conduction heat transfer. This further affects kinetic absorption and heat release. However it is possible to increase the values by adding another material that has a high thermal conductivity. The purpose of this study is to elevate the thermal conductivity of beef tallow by adding rice husk char. This research involves direct incorporation method, where beef tallow is thawed and mixed with the rice husk char then stirred with a rotation of 100 rpm until the mixture becomes solid. Addition of rice husk char with weight fractions of 5 and 10% and grain size of 0.045 mm. Subsequently, thermal conductivity test was performed using the TQ Heat Transfer Experiment Base Unit.The results show that with the addition of rice husk can increase the thermal conductivity of PCM beef tallow. The increase obtained in the addition of 10% rice husk char is 37 times compared to the pure sample. Based on this result it is concluded that carbon-based materials such as rice husk char can be used to increase the thermal conductivity of PCM materials.

OPTIMASI MASSA KATUP LIMBAH POMPA HYDRAM TERPASANG DI WILAYAH MUNDUK GUNUNG DESA PETANG M. Suarda; N.M. Suaniti; M. Sucipta; N. Suweden; I.G.K. Dwijana
Buletin Udayana Mengabdi Vol 23 No 1 (2024): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BUM.2024.v23.i01.p14

This paper investigated the effect of the mass of the waste valve of hydraulic ram pump which has been designed and installed to deliver the clean water to the community house in the Munduk Gunung area, Petang Village. Public facilities are still minimal. One of them is the unavailability of clean water service facilities for the community, where people still rely on rainwater or buy water tanks. In accordance with the name of the area, this residential area is located in the highlands (512 m.swl), while the available water sources are in the lowlands (410 m.swl) with an elevation difference of 102 meters. The distance from the spring to the reservoir is 600 meters through a steep cliff. Initial survey results show that the spring has a flow capacity of about 3 liters/second and a potential head of 4.5 meters. The hydraulic ram pump has been designed, built, installed and operated with funding supported through the PNBP service grant from Udayana University, the PUMA scheme. The hydraulic ram pump performance test has been carried out on five variations of the waste valve mass. Performance testing shows that this hydraulic ram pump reaches its optimal performance at a mass of 3.25 kg of waste valve. Under these optimal conditions, this hydraulic ram pump operates at a total efficiency of 95% with a pumping flow of 0.115 lt/sec or 9.94 m3/day) at a pumping elevation of 102 meters, with an economic value of up to Rp. 17,885,000 per month. Therefore, it is with an investment cost of around Rp. 42,500,000 and requires almost no operational costs because it does not require fuel or electrical energy, consequently this hydram pump is very profitable to apply. Keywords: Hydraulic ram pump, waste valve mass, pump performance, Munduk Gunung area, Petang village.

UJI PERFORMANSI POMPA HYDRAM DALAM PENYEDIAAN AIR BERSIH KELOMPOK USAHA BON BELOK KOPI DAN BANJAR ADAT BON DESA BELOK/SIDAN M. Suarda; N.M. Suaniti; M. Sucipta; N. Suweden; I.G.K. Dwijana; I.P. Widiarta
Buletin Udayana Mengabdi Vol 23 No 1 (2024): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BUM.2024.v23.i01.p06

This paper examined the performance of the hydraulic ram pump that has been designed and installed to meet the clean water needs of the 'Bon Belok Kopi' Business Group and several families of Bon traditional community in Belok/Sidan Village, Petang District, Badung Regency, Bali Province. This business group is shortage to clean water in the process of processing their coffee production so that the community relies on rainwater and buys water from tank cars at a price of sixty thousand rupiah per cubic meter. Likewise, the Bon traditional community experienced the same problem, especially for their traditional activities. This problem has an impact on the capacity, quality and cost of coffee production of the business group, as well as the cleanliness, health and economy of the Bon traditional community. In the Bon area, there is a spring in the garden area belonging to the head of the business group with a flow rate of 3 liters/second at an elevation of 1024 m.swl, while residential areas are located at an elevation of 1135 m.swl. The hydraulic ram pump has been designed, built, installed and operated. The hydraulic ram pump performance test has been carried out on five variations of the pumping head. At a pumping head of 70 m, at the location of coffee processing, it produces a pumping flow of 8.84 m3/day with the pump efficiency of 71%. Meanwhile, at the highest pumping head of 110 m, at Puncak Bon Temple, it produces a pumping discharge of 5.04 m3/day with the pump efficiency of 59%. Keywords: Hydram pump, pump performance, Bon Belok Kopi, Bon traditional community.

APLIKASI DESULFURIZER METODE ADSORPSI DENGAN KARBON AKTIF D.N.K.P. Negara; T.G.T. Nindhia; I.M. Widiyarta; T.S. Nindhia; I.G.K. Dwijana; I.W.A.R. Dana; I.B.P. Purwadnyana; I.G.N.W. Gunawan
Buletin Udayana Mengabdi Vol 23 No 1 (2024): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BUM.2024.v23.i01.p01

Biogas produced from cow dung at the Tulus Nadi Livestock Farmer Group in Banjar Gambih, Buahan Village, Payangan District, has been used as cooking fuel. However, the high sulfuric acid (H2S) content of biogas can reduce fuel quality and shorten the life of the biogas stove because H2S causes the components of the biogas stove to rust. This service aims to reduce the H2S content of biogas through the adsorption method, which employs activated carbon as an adsorbent. The service includes practice and instruction in desulfurizer installation, maintenance, and activated carbon regeneration. The test results show that the breeder understands and can use the desulfurizer tool effectively. The desulfurizer can reduce the H2S content to 95.9%, allowing the biogas produced to be used optimally for daily cooking purposes. Keywords: Biogas, adsorption, activated carbon, livestock waste

KARAKTERSTIK SERAPAN SUARA KOMPOSIT POLYESTER BERPENGUAT SERAT TAPIS KELAPA Astika, I Made; Dwijana, I Gusti Komang
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 6, No 1 (2016): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

The purpose of this study is to investigate of sound absorption of coconut filter fiber composites. The research material made with coconut filter fiber as reinforcement and matrix resin unsaturated polyester (UPRs) type Yukalac BQTN 157 with 1% hardener types MEKPO (Methyl Ethyl Ketone Peroxide) and fiber treatment by 0,5% KMnO4. Production methods is poltrusion and the variations of fiber volume fraction are 20, 25 and 30% and fiber length are 5, 10 and 15 mm. Testing of sound absorption frequency are 250, 500, 1000, 2000 and 4000 Hz. The results of research show that the highest value of sound absorption coefficient is on the composites with composition of 10 mm fiber length and 30% fiber volume fraction, that is 0.550828. The values are included in the class “Sound Absorption Coefficient Class D (Extremely absorbing)” with the range 0.40 – 0.60 based on ISO standard 11654:1997.

KARAKTERSTIK SERAPAN SUARA KOMPOSIT POLYESTER BERPENGUAT SERAT TAPIS KELAPA Astika, I Made; Dwijana, I Gusti Komang
Dinamika Teknik Mesin Vol 6, No 1 (2016): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v6i1.19

The purpose of this study is to investigate of sound absorption of coconut filter fiber composites. The research material made with coconut filter fiber as reinforcement and matrix resin unsaturated polyester (UPRs) type Yukalac BQTN 157 with 1% hardener types MEKPO (Methyl Ethyl Ketone Peroxide) and fiber treatment by 0,5% KMnO4. Production methods is poltrusion and the variations of fiber volume fraction are 20, 25 and 30% and fiber length are 5, 10 and 15 mm. Testing of sound absorption frequency are 250, 500, 1000, 2000 and 4000 Hz. The results of research show that the highest value of sound absorption coefficient is on the composites with composition of 10 mm fiber length and 30% fiber volume fraction, that is 0.550828. The values are included in the class “Sound Absorption Coefficient Class D (Extremely absorbing)” with the range 0.40 – 0.60 based on ISO standard 11654:1997.

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