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Pendugaan Sisa Umur Pakai Kayu Komponen Cooling Tower di Pembangkit Listrik Tenaga Panas Bumi (PLTP) Unit II Kamojang Bahtiar, Effendi Tri; Nugroho, Naresworo; Arinana, Arinana; Darwis, Atmawi
Jurnal Teknik Sipil Vol 19, No 2 (2012)
Publisher : Institut Teknologi Bandung

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Abstrak. Struktur cooling tower di PLTP (Pembangkit Listrik Tenaga Panas Bumi) Unit II Kamojang dibangun pada tahun 1988 dengan kayu sebagai komponen utamanya. Setelah 23 tahun umur pakainya, dirasa perlu dilakukan evaluasi sisa umur pakai sebagai salah satu bahan pertimbangan untuk memutuskan perobohan atau perpanjangan pemakaiannya. Evaluasi dilakukan melalui beberapa tahap yaitu: identifikasi jenis kayu dan keberadaan sisa bahan pengawet, pengukuran kedalaman kerusakan, pengujian sifat fisis mekanis, dan pemodelan matematis yang diturunkan dari uji creep dan pengurangan luas penampang kayu. Identifikasi memperlihatkan bahwa kayu yang dipergunakan untuk komponen utama cooling tower di PLTP Unit II Kamojang adalah redwood (Sequoia sempervirens) yang diawetkan dengan CCA (Chromated Copper Arsenat). Kerusakan telah terjadi sedalam 2,95 mm, namun secara umum masih memiliki tegangan ijin yang lebih tinggi daripada persyaratan NDS2005. Penelitian ini telah menghasilkan model terbaik yang dapat dipergunakan untuk menduga sisa masa pakai kayu komponen cooling tower di PLTP Unit II Kamojang dengan koefisien determinasi sebesar 86,84%. Abstract. Cooling tower in PLTP (Geothermal Power Plant) Unit II Kamojang was built in 1988, using solid wood as its main komponen. It is 23 years old nowadays, and should be evaluated to estimate its remaining lifetime. The evaluation conducted as scientific consideration for the company to decide wheter the cooling tower should be deconstruct or maintain to lenghten their lifetime. Some steps were conducted to estimate the remaining lifetime, namely: identification of wood species and the preservative remaining,measuring the depth of damages, measuring the physical and mechanical properties, and mathematical modelling which construct from creep testing and area reduction. This research show that the cooling tower was built with redwood (Sequoia sempervirens) which were treated with CCA (Chromated Copper Arsenat) preservative. The damage was happened until 2,95 mm depth, but the mechanical properties was commonly still better than NDS 2005 requirement. TheÂ research result mathematical equation which is suitable to predict the remaining lifetime of wood component in PLTP Unit II Kamojang with coefficient of determination 86,84%.

Teknologi umpan berbahan aktif kitosan untuk pengelolaan rayap tanah Cototermes curvignathus Holmgren (Isoptera: Rhinotermitidae) Arinana Arinana
Jurnal Ilmu Pertanian Indonesia Vol. 12 No. 1 (2007): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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The cost of termite Coptotermes curvignathus attack on buildings is enormous. In Indonesia, we know one environmental tolerant method to overcome the attack which is called baiting systems. However, this methods is relatively expensive, because there is only one product available all over the country. Chitosan is known for its bioactive ability as the retardant in mushrooms and fungi growth. Based on these facts, chitosan is assumed had the capability as a substance that could eradicate subterannean termite with baiting system which are environmental tolerant. Chitosan was dissolved in acetatic acid solvent. The concentration of the chitosan solvent used in this research were 0% (control), 0,25%, 0,5%, 1%, 2%, 3%, 4%, and 5%. The samples in this research were filter papers. The responses analyzed were percentage of termite mortality and weight loss percentages. Concentration of 0,5% chitosan gave significant affect on mortality of subterannean termite C. curvignathus. The highest percentage of mortality of subterannean termite C. curvignathus was by 4% concentration, which was 94,2%. While the weight loss percentage of filter papers gave a very significant affect at 1% concentration. The lowest weight loss percentage of filter papers was at 4% concentration of chitosan solvent, which was 7,4%.

Pengujian Efikasi Skala Laboratorium Kayu Hasil Fumigasi Terhadap Serangan Rayap Tanah (Coptotermes curvignathus) Imam Wahyudi; Istie Sekartining Rahayu; . Arinana
Jurnal Ilmu Pertanian Indonesia Vol. 17 No. 3 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Fumigated wood was assumed to retain durability level against wood destroying factors. Due to lack of data, fumigated wood durability against wood destroying factors needs to be investigated, especially toward subterranean termites. The aim of this research was to evaluate fumigated wood durability against subterranean termites attack in laboratory scale (ASTM D 3345-2008). Wood samples used were sengon (Falcataria moluccana), rubberwood (Hevea brasiliensis), and mangium (Acacia mangium). Samples of 2.5 × 2.5 × 0.6 cm were fumigated inside 2 × 1 × 1 m of fumigation chamber using 2, 4, 6, 8, and 10 liters of ammonia solution for 4 days. The samples were then transferred into glass bottle, along with sterile sand and 200 worker and 20 soldier subterranean termites. After 4 weeks, mortality and weight loss percentage were measured. All treatments showed 100% of mortality, while a significant decline in weight loss percentage was varied depends on wood species as well as the volume of ammonia. Therefore, fumigated wood was proven resistant against the attacks of subterranean termites.

Pulai (Alstonia scholaris) was classification as IV-V for strenght class and V for durability class. This means that pulai has a low quality. One effort to improved the quality of pulai wood was densification process. This research aimed to evaluation the physical, mechanical and durability of pulai wood before and after densification process and to evaluated the temperature and pressing time on resulted the best quality of pulai wood. Densification was conducted on 160 °C and 180 °C with thre ARINANA .; Farah DIBA
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 2 (2009): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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Pulai (Alstonia scholaris) was classification as IV-V for strenght class and V for durability class. This means that pulai has a low quality. One effort to improved the quality of pulai wood was densification process. This research aimed to evaluation the physical, mechanical and durability of pulai wood before and after densification process and to evaluated the temperature and pressing time on resulted the best quality of pulai wood. Densification was conducted on 160 °C and 180 °C with three pressing time 40 minute, 50 minute and 60 minute respectively. Densification targetted was 30%. Physical and mechanical process was conducted based on British Standard Methods No. 373 (1957), meanwhile durability test against subterranean termites was conducted with modified wood block test methods. Result of the research showed that densified pulai wood has the highest quality on physical, mechanical and durability properties than pulai wood control. The best densified treatment was on 180 °C with pressing time 60 minute. Densification process has improve the quality of pulai wood on one level class. Keywords : Alstonia sp, densification process, Coptotermes curvignathus

The development of baiting system was very advanced, however it was very expensive thus the use of it was limited on certain community. Based on those conditions, it was needed a researches on local resourches basis or low cost material baiting system in order to be applicated in building protection included simple home. This researches consisted of laboratory and field test. The laboratory test was performed to determine preference baiting media (pulp, sawdust, Pinus merkusii wood, WMD (wood mo Yudi RISMAYADI; ARINANA .
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 1 (2009): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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The development of baiting system was very advanced, however it was very expensive thus the use of it was limited on certain community. Based on those conditions, it was needed a researches on local resourches basis or low cost material baiting system in order to be applicated in building protection included simple home. This researches consisted of laboratory and field test. The laboratory test was performed to determine preference baiting media (pulp, sawdust, Pinus merkusii wood, WMD (wood monitoring devices) from Pinus radiata and reliability tested between disodium borax decahydrate and chitosan against Coptotermes curvignathus. After the determination of baiting system and reliability, field test was performed on termite attacked building. Field test consisted of termite presence detection,observatory station, determination of consumption rate and baiting system resistance. The laboratory results showed the most preference baiting system was WMD with persentage weight loss was 40.5%. The comparation of reliability between disodium borax decahydrate and chitosan showed that termite mortality of disodium borax decahydrate was higher than chitosan, meanwhile reliability results showed oltherwise. Chitosan field test showed eating consumption level was decreasing at 75th days and on 135th days eating consumption level was rached 15 gr/day. It meaned there was a decreasing of termite population cause of termite baiting system. Keywords : Pulp, disodium borax, chitosan, baiting, Coptotermes curvignathus

Pendugaan Sisa Umur Pakai Kayu Komponen Cooling Tower di Pembangkit Listrik Tenaga Panas Bumi (PLTP) Unit II Kamojang Effendi Tri Bahtiar; Naresworo Nugroho; Arinana Arinana; Atmawi Darwis
Jurnal Teknik Sipil Vol 19 No 2 (2012)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2012.19.2.2

Abstrak. Struktur cooling tower di PLTP (Pembangkit Listrik Tenaga Panas Bumi) Unit II Kamojang dibangun pada tahun 1988 dengan kayu sebagai komponen utamanya. Setelah 23 tahun umur pakainya, dirasa perlu dilakukan evaluasi sisa umur pakai sebagai salah satu bahan pertimbangan untuk memutuskan perobohan atau perpanjangan pemakaiannya. Evaluasi dilakukan melalui beberapa tahap yaitu: identifikasi jenis kayu dan keberadaan sisa bahan pengawet, pengukuran kedalaman kerusakan, pengujian sifat fisis mekanis, dan pemodelan matematis yang diturunkan dari uji creep dan pengurangan luas penampang kayu. Identifikasi memperlihatkan bahwa kayu yang dipergunakan untuk komponen utama cooling tower di PLTP Unit II Kamojang adalah redwood (Sequoia sempervirens) yang diawetkan dengan CCA (Chromated Copper Arsenat). Kerusakan telah terjadi sedalam 2,95 mm, namun secara umum masih memiliki tegangan ijin yang lebih tinggi daripada persyaratan NDS2005. Penelitian ini telah menghasilkan model terbaik yang dapat dipergunakan untuk menduga sisa masa pakai kayu komponen cooling tower di PLTP Unit II Kamojang dengan koefisien determinasi sebesar 86,84%. Abstract. Cooling tower in PLTP (Geothermal Power Plant) Unit II Kamojang was built in 1988, using solid wood as its main komponen. It is 23 years old nowadays, and should be evaluated to estimate its remaining lifetime. The evaluation conducted as scientific consideration for the company to decide wheter the cooling tower should be deconstruct or maintain to lenghten their lifetime. Some steps were conducted to estimate the remaining lifetime, namely: identification of wood species and the preservative remaining,measuring the depth of damages, measuring the physical and mechanical properties, and mathematical modelling which construct from creep testing and area reduction. This research show that the cooling tower was built with redwood (Sequoia sempervirens) which were treated with CCA (Chromated Copper Arsenat) preservative. The damage was happened until 2,95 mm depth, but the mechanical properties was commonly still better than NDS 2005 requirement. The research result mathematical equation which is suitable to predict the remaining lifetime of wood component in PLTP Unit II Kamojang with coefficient of determination 86,84%.

Steaming Effect on Natural Durability of Bamboo Oriented Strand Board against Termites and Powder Post Beetle Fauzi Febrianto; Intan Purnamasari; Arinana Arinana; Adiyantara Gumilang; Nam H Kim
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 2 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objective of this research was to evaluate the resistance of bamboo oriented strand board (BOSB) prepared from steamed and non-steamed strands of five (5) bamboo species against subterranean termite (Coptotermes curvignathus), dry wood termite (Cryptotermes cynocephalus), and powder post beetle. The five bamboo species were betung, andong, ampel, hitam, and tali. In steaming treatment, bamboo strands were steamed in autoclave at 126 °C and 1.4 kg cm-2 pressure for 1 h prior mixing with adhesive. Strands were bonded into BOSB by the use of commercial Phenol formaldehyde (PF) adhesive at 10% (w/w) of oven dried strands. The resistance of BOSB against termite was done based on SNI 01.7207-2006 procedures and requirement. The results indicated that the resistance of BOSB against termites was significantly affected by bamboo species and steam treatment. The resistance of BOSB prepared from steamed bamboo strands against C. curvignathus and C. cynocephalus was higher than that of non-steamed bamboo strands particularly that of ampel bamboo strands. The powder post beetle was identified as Anobium sp. Bamboo species and strands steaming did not significantly influence the resistance of BOSBs against Anobium sp.Key words: bamboo, dry wood termite, oriented strand board, powder post beetles, subterranean termite

Evaluasi Kondisi Komponen Pengaku pada Menara Pendingin dan Perkiraan Sisa Masa Pakainya Effendi T. Bahtiar; Wilis Wiryawan; Kholiyah Kholiyah; Rita K. Sari; Arinana Arinana; Naresworo Nugroho
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 14, No 1 (2016): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Menara pendingin merupakan sistem pendinginan yang melepaskan panas ke udara untuk menurunkan suhu air melalui mekanisme penguapan. Air panas ditumpahkan dari puncak ke dasar menara, melewati sirip-sirip sehingga air terpencar dan kontak dengan angin dingin. Penelitian ini ditujukan untuk mengukur degradasi komponen pengaku pada bangunan menara pendingin yang telah berumur 15 tahun, serta menduga sisa umur pakainya. Beberapa pengujian dilakukan antara lain identifikasi jenis kayu, uji sisaan bahan pengawet, pengukuran degradasi kerapatan, uji mekanis statis, dan uji rangkak. Kayu diidentifikasi sebagai Douglas fir (Pseudotsuga menziesii). Hasil pengujian menunjukkan bahwa dinding sel kayu telah terdegradasi, kerapatan kayu di lapisan luar telah menurun di banding kontrol, dan sifat-sifat mekanis kayu telah terdegradasi sehingga nilainya menjadi lebih rendah daripada spesifikasi NDS 2005. Uji creep juga menunjukkan bahwa kekuatan kayu terus menurun seiring dengan semakin lamanya jangka waktu pembebanan. Berdasarkan laju deteriorasi kayu dan penurunan kekuatan selama jangka waktu pembebanan, sebuah model matematika dibangun untuk menduga sisa masa pakai kayu. Model yang dibangun menghasilkan dugaan sisa masa pakai komponen pengaku yaitu 7 tahun lagi.

Natural Durability of Nine Woods Species Grown in Dramaga Campus Bogor Agricultural University against Termite Attacked fauzi Febrianto; Andi Z Pranata; Arinana Arinana; Adiyantara Gumilang
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 1 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objective of this research was to evaluate the natural durability of nine Indonesia lesser known species against subterranean termite (Coptotermes curvignathus Holmgren) and dry wood termite (Cryptotermes cynocephalus Light) attacked grown in Dramaga campus, Bogor Agricultural University. Sap and hearth wood parts of mangium, durian, nangka, angsana, afrika, rukam, trembesi, bisbul, and ki sampang woods with diameter around 13-30 cm were used in this experiment. Evaluation of natural durability of wood referred to SNI 01-7207-2006. The hearth wood of nangka wood was the most durable wood against C. curvignathus attacked and it was classified into 2nd class. Bisbul, rukam and trembesi woods both sap and herath wood and heart wood of angsana wood were classified into 3rd class. Mangium and afrika woods both sap and hearth woods were classified into 4th class. Ki sampang and durian woods both sap and hearth woods and sap wood of nangka and angsana woods were classified into 5th class. All the 9 woods species (i.e. rukam, bisbul, mangium, ki sampang, afrika, nangka, durian, angsana and trembesi woods) both sap and hearth wood parts were moderately resistance to C. cynocephalus and they were classified into 3rd class.Key words: dry wood termite, hearth wood, lesser known species, natural durability, sap wood, subterranean termite

Antioxidant Activity of Fungus Comb Extracts Isolated from Indo-Malayan Termite Macrotermes gilvus Hagen (Isoptera: Termitidae) Yanti Rachmayanti; Dikhi Firmansyah; Reza Ro'isatul Umma; Decsa Medika Hertanto; I Ketut Sudiana; Djoko Santoso; Dodi Nandika; Lina Karlinasari; Arinana Arinana; Irmanida Batubara; Lucia Dhiantika Witasari
Indonesian Journal of Chemistry Vol 22, No 6 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.77227

Indonesian termites are one of the wealthiest biological resources considering their very high species diversity (300 species) and extensive geographical distribution in the Indonesian mainland. However, its potential as a source of bioactive compounds has not been fully explored. One of the endemic termite sub-families of Indonesian, Macrotermitinae (Isoptera: Termitidae), has a food source in the form of fungal nodules that grow and spread in a particular structure in the termite nest that is shaped like a mammalian brain called a fungus comb, which likely serves as a source of bioactive compounds. This study aims to analyze the potential of fungus comb from an Indonesian Macrotermitinae sub-family species as a source of antioxidants. Antioxidant activity was tested on four different extracts of fungus comb (EFC), namely hexane extract, ethyl acetate extract, methanol extract and water extract, using DPPH• (1,1-diphenyl-2-picrylhydrazyl) and ABTS•+ (2,2′-azino-di-[3-ethylbenzthiazolinesulphonate]) radicals. The results showed that the highest antioxidant activity was found in methanol extract, followed by ethyl acetate extract with IC50 values of 0.6 mg/mL and 0.75 mg/mL, respectively. TEAC (Trolox equivalent antioxidant capacity) analysis confirmed the high antioxidant activity of methanol extract.

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