Analisa Hidrolika Sistem Irigasi Perpipaan

Asid, Nurul Jannah (2018) Analisa Hidrolika Sistem Irigasi Perpipaan. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Agropolitan Poncokusumo berada di Kecamatan Poncokusumo Kabupaten Malang menggunakan irigasi perpipaan untuk mengairi tanaman sayur dan buah seluas 670 ha. Penggunaan irigasi perpipaan untuk efisiensi penggunaan air dan pemanfaatan air hingga lahan terjauh.. Setelah beroperasi selama tiga tahun terjadi kehilangan energi di jaringan irigasi tersebut. Kehilangan energi mempengaruhi kinerja irigasi yang ada. Saat ini belum diketahui penyebab kehilangan energi serta letak permasalahan yang diperkirakan menyebabkan kehilangan energi. Sehingga perlu adanya penelitian untuk melihat kondisi pipa setelah beroperasi selama tiga tahun. Tujuan dari penelitian ini adalah analisa kondisi pipa setelah beroperasi selama tiga tahun dengan membandingkan nilai koefisien gesek pipa (f) simulasi dengan teori. Penelitian ini akan dilakukan pada jaringan pipa yang ada. Jaringan pipa yang ada dibagi menjadi 5 rangkaian, tiap rangkaian akan mengalirkan air dari reservoir ke satu titik pengambilan dengan melewati satu hingga tiga pipa dengan diameter berbeda. Menggunakan data elevasi, debit lapangan, diameter pipa, dan panjang pipa. Tiap rangkaian dilakukan simulasi dengan tiga variasi ketinggian air di reservoir. Hasil simulasi akan diketahui besar tekanan yang tersisa diujung pengambilan. Dari output tersebut kemudian dilakukan perhitungan kehilangan energi pada tiap rangkaian. Dari nilai kehilangan energi dilakukan perhitungan analitik untuk mendapatkan Nilai f simulasi. Nilai f simulasi dibandingkan dengan f teori yang didapat dengan rumus Blasius dan Grafik Moody. Jika selisih nilai lebih dari 10% maka kondisi pipa bermasalah, jika kurang dari 10% maka kondisi pipa masih baik. Hasil dari penelitian didapatkan besar kehilangan energi pada masing-masing rangkaian tiga variasi ketinggian air di reservoir, Yaitu : Rangkaian R-B = 0,02 m dengan debit 2,5 l/dtk, Rangkaian R-C= 5,89 m dengan debit 14,5 l/dtk. Rangkaian R-F= 3,09 m dengan debit 12 l/dtk, Rangkaian R-H=7,5 m dengan debit 4 l/dtk, Rangkaian R-D = 6,82 m dengan debit 9 l/dtk. Nilai f hasil simulasi pada lima rangkaian pipa mendapatkan nilai f simulasi adalah Pipa 1 ø8 Inch = 0,019, pipa 2 ø6 Inch = 0,019, Pipa 3 ø3 Inch = 0,022, Pipa 4 ø4 Inch = 0,019. Nilai f teori menurut Rumus Blasius adalah Pipa 1 ø8Inch = 0,020, pipa 2 ø6Inch = 0,018, Pipa 3 ø3 Inch = 0,020, Pipa 4 ø4 Inch = 0,017. Menurut Grafik Moody adalah Pipa 1 ø8 Inch = 0,020, pipa 2 ø6 Inch = 0,018, Pipa 3 ø3 Inch = 0,020, Pipa 4 ø4 Inch = 0,018.Selisih f simulasi dan f teori kurang dari 10%. Dari nilai selisih antara f teori dan simulasi tersebut dapat disimpulkan jika kondisi pipa masih baik setelah beroperasi selama tiga tahun, dan pipa tidak perlu dilakukan pergantian karena masih kondisi bagus. ======================================================================================== Poncokusumo Agropolitan is located in Poncokusumo District, Malang Regency using piping irrigation to irrigate 670 ha of vegetables and fruits. The use of piping irrigation is for the efficiency of the use of water and the utilization of water to the farest land. In addition, the condition of soil in Poncokusumo is sandy, so when using open irrigation, the water will absorb so that water will not come to the farest land. After operating for three years, there is an head loss in the irrigation network. Head loss affects existing irrigation performance. Currently, the cause of head loss and the problem estimated to cause head loss are unknown. Therefore it is necessary to research to see the condition of the pipe after operating for three years. The purpose of this research is pipeline condition analysis after three years operation by comparing the coefficient of friction pipe (f) simulation with theory. In this research will be analyzed on existing pipelines. The existing pipe network is divided into 5 pipeline, each series will drain the water from the reservoir to a single point of retrieval by passing through one to three pipes of different diameter. This uses elevation data, field debit, pipe diameter, and pipe length. Each series is simulated with three variations of water level in the reservoir. In the simulation results, it will be known the amount of pressure remaining at the end of the retrieval. From the output, the calculation of the head loss in each pipeline will be carried out. From the head loss value, it will find the value of f simulation. The value of f simulation is compared with the f theory obtained by the formula of Blasius and Moody Graph. If the difference in value is more than 10%, then the condition of the pipe is problematic, if less than 10% then the condition of pipe is still good. From the results of the research, it obtains the amount of head loss in each series of three water height variations in the reservoir, they are: Pipeline R-B = 0.02 m with with 2,5 l/s discharge, Pipeline R-C = 5,01 m with 14,5 l/s discharge, Pipeline R-F = 2.82 m with 12 l/s discharge, Pipeline R-H = 6.21 m with 4 l/s discharge, Pipeline R-D = 5.8 m with 9 l/s discharge. The value of f simulation in five pipe networks obtaining the value of f simulation is Pipe 1 ø8 Inch = 0.019, Pipe 2 ø6 Inch = 0.018, Pipe 3 ø3 Inch = 0.022, Pipe 4 ø4 Inch = 0.019. The f theoretical value according to Blasius Formula is Pipe 1 ø8 Inch = 0.020, Pipe 2 ø6 Inch = 0.018, Pipe 3 ø3 Inch = 0.020, Pipe 4 ø4 Inch = 0.017. According to Moody Graph is Pipe 1 ø8 Inch = 0.020, pipe 2 ø6 Inch = 0.018, Pipe 3 ø3 Inch = 0.020, Pipe 4 ø4 Inch = 0.018. Dispute of f simulation and f theory is less than 10%. Of these values, it can be concluded if the pipe condition is still good after operating for three years. There is no need to change the pipes.

Item Type: Thesis (Masters)
Additional Information: RTS 627.13 Asi a-1 3100018074359
Uncontrolled Keywords: Hydraulic Analysis; Darcy Weisbach f friction coefficient; Analisa Hidrolika; Koefisien gesek; Darcy Weisbach f
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics.
Divisions: Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22101-(S2) Master Theses
Depositing User: Nurul Jannah Asid
Date Deposited: 15 Feb 2018 07:54
Last Modified: 11 Jun 2020 14:12
URI: https://repository.its.ac.id/id/eprint/49564

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