Kehilangan Energi pada
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Kehilangan Energi pada
ALIRAN MELALUI PIPA PESAT
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PERSAMAAN BERNAULLI
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Tinggi Kekasaran pipa
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Contoh Soal
• Suatu Pipa pesat dari baja dengan panjang 350 m, diameter 8 inch, mengalirkan debit air sebesar 750 lt/dt. Suhu air 20 o C. Hitung kehilangan energi yang terjadi.
• Suatu pipa dari baja dengan panjang 2000 m, diameter 250 mm, mengalirkan air dengan suhu 20 o C. Jika terjadi kehilangan energi sebesar 2 m, hitung debit aliran.
• Tentukan dimensi pipa baja yang mengalirkan debit 500 lt/dt dan kehilangan energi maks yg diijinkan 5 m/km
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Rumus-rumus empiris
• Pipa di daerah transisi
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Pipa di daerah turbulen
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Kehilangan tenaga Sekunder
• Perbesaran penampang
• Pengecilan penampang
• Belokan Pipa
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Perbesaran penampang
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Perbesaran penampang
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Pengecilan Penampang
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Belokan pipa
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Tinggi kecepatan diabaikan :
Garis tenaga dan garis tekanan berimpit
fs hHH 52
22 8
2 Dg
fLQ
g
V
D
Lfh f
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321 QQQQ
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Dua reservoir A dan B dihubungkan dengan 3 buah pipa yang dihubungkan secara seri dengan urutan sbb: Reservoir A pipa 1 pipa 2 pipa 3 Reservoir B. Data ketiga pipa adalah sebagai berikut:-pipa 1 panjang 1000 m; diameter = 160 mm;-pipa 2 panjang 1600 m; diameter = 200 mm;-pipa 3 panjang 850 m; diameter = 180 mm;Jika debit yang mengalir sebesar Q = 0,02 m3/s dan koefisien kekasaran
Darcy-Weisbach untuk ketiga pipa sama sebesar f = 0,02; • Hitung selisih elevasi muka air antara kedua reservoir
(kehilangan energi primer dan sekunder diperhitungkan)• Gambarkan garis tenaga dan garis tekanan pada pipa seri
tersebut (tinggi tekanan tidak diabaikan)