I. Data Percobaan Data Pengamatan Pompa Kecepatan Putaran (N) = 1200 rpmPada V = 20 Liter dan t = 8 sH orifice (m Hg)H1 (m Hg)H2 (m Hg)Hs (m w g)Hd (m w g)W (Kg)

0.0150.5400.4470.400.50.6170

0.0400.5640.4250.401.00.9677

0.0350.5680.4320.401.00.8728

0.0400.5850.4500.401.01.0215

Data Pengamatan Pompa Kecepatan Putaran (N) = 1350 rpmPada V = 20 Liter dan t = 7 sH orifice (m Hg)H1 (m Hg)H2 (m Hg)Hs (m w g)Hd (m w g)W (Kg)

0.0250.5250.4630.300.10.7194

0.0330.5400.4550.231.00.6171

0.0280.5700.4150.301.00.7163

0.0400.5900.4000.402.00.7164

Data Pengamatan Pompa Kecepatan Putaran (N) = 1425 rpmPada V = 20 Liter dan t = 5.5 sH orifice (m Hg)H1 (m Hg)H2 (m Hg)Hs (m w g)Hd (m w g)W (Kg)

0.0400.5500.4300.401.00.7705

0.0350.5530.4400.301.00.7960

0.0300.5550.4400.371.00.7705

0.0350.5700.4300.301.50.8187

Data Pengamatan Pompa Kecepatan Putaran (N) = 1575 rpmPada V = 20 Liter dan t = 5.6 sH orifice (m Hg)H1 (m Hg)H2 (m Hg)Hs (m w g)Hd (m w g)W (kg)

0.0380.5750.4330.401.00.8729

0.0380.5700.4400.401.50.8903

0.0400.5900.4500.302.00.9718

0.0400.5650.4400.401.00.8943

Data Pengamatan Pompa Kecepatan Putaran (N) = 1775 rpmPada V = 20 Liter dan t = 5.1 sH orifice (m Hg)H1 (m Hg)H2 (m Hg)Hs (m w g)Hd (m w g)W (Kg)

0.0500.5900.4250.601.51.2346

0.0530.5950.4250.501.81.1319

0.0530.6000.4130.501.51.1319

0.0550.6240.3900.502.31.2346

II. Pengolahan Data Menghitung Laju Alir (Q)

Perhitungan dengan menggunakan cara tak langsung Perhitungan Head Pompa Rumus : H = ( )+ VHC + ZPerhitungan dengan menggunakan cara langsung Perhitungan Head Pompa Rumus : H = (Hd )+ VHC + Z

VHC = Q2 x 21.300Keterangan Hs : Tinggi permukaan air raksa manometer pipa suction (m)Hd : Tinggi permukaan air raksa manometer pipa discharge (m)Z : Perbedaan tinggi pengukuran suction & discharge (0,3 m)VHC : Velocity head correction Ug : Densitas air raksa (13.600 Kg/m3)Uw : Densitas air (1000 Kg/m3)

Perhitungan Daya Dinamometer pompa Rumus : No = W L g n KeteranganW : Beban untuk kesetimbangan dinamometer (kg) L : Panjang lengan torsi = 200mm = 0,2 m n : Kecepatan putaran dinamometer (rad/s) n = N (2 / 60) (rad / s) N : Kecepatan putaran dinamometer (rpm) g : Gaya gravitasi (9,8 m/s2) Perhitungan Efisiensi Pompa Rumus : = [Nh/Np] x 100 %KeteranganNh : Daya hidrolik (watt)Nh = Q w g H Uw : Densitas air (kg/m3)Np : Daya yang dibutuhkan pompa (watt)Np = No - NtNt : Antara 100 150 Watt

III. Hasil PerhitunganA. Hasil Perhitungan1. Secara LangsungN (rpm)BukaanValveQ x 10-3 (m3/s)H PompaNo (watt)Nh (watt)Np (watt) (%)

1200Tap 12.500.5331151.890613.060951.8906690.8362

Tap 21.0331238.224525.3109588.224528.683

Tap 31.0331214.862425.3109564.862439.0225

Tap 41.0331251.468825.31095101.468824.9446

1350Tap 12.860.2742199.23647.6852844.23647.5740

Tap 21.2442170.904634.8724420.9046166.8171

Tap 31.1742198.377932.9104748.377968.0278

Tap 42.0742198.405558.1356848.405558.1250

1425Tap 13.641.1822563.108442.17144413.108410.2083

Tap 21.2822232.697945.7386482.243355.6138

Tap 31.2122225.243343.2416075.243357.4690

Tap 41.7822239.333863.5746489.333371.1657

1575Tap 13.571.1175282.039239.09686132.039229.6100

Tap 21.6175287.661356.58986137.661341.1080

Tap 32.2715313.994479.4707163.994448.4594

Tap 41.1175288.953739.09686138.953728.1366

1775Tap 13.921.5273449.553458.67276299.553419.5881

Tap 21.9273412.157474.03916262.157428.2423

Tap 31.1273412.157443.30636262.157416.5192

Tap 42.6273449.5534100.9304299.553433.6936

2. Secara Tak LangsungN (rpm)BukaanValveQ x 10-3 (m3/s)H PompaNo (watt)Nh (watt)Np (watt) (%)

1200Tap 12.501.6049151.890639.320051.89062079.7657

Tap 22.1845238.224553.5202588.224560.6637

Tap 32.1467214.862452.5941564.862481.0857

Tap 42.1341251.468852.28545101.468851.5286

1350Tap 12.861.2554199.236435.1863544.236434.6770

Tap 21.5452170.904643.3088920.9046207.1740

Tap 32.4272198.377968.0295648.3779140.6212

Tap 42.8682198.405580.3899148.4055166.0760

1425Tap 13.642.0942563.108474.7043413.108418.0834

Tap 22.006232.697971.5580382.243387.0077

Tap 32.0312225.243372.4569775.243396.2969

Tap 42.3462239.333883.6936489.333393.6869

1575Tap 13.572.3607282.039282.59145132.039262.7779

Tap 22.2095287.661377.30157137.661356.1535

Tap 32.3355313.994481.7098163.994449.8248

Tap 42.1465288.953775.09745138.953754.0449

1775Tap 13.922.7063449.5534103.9652299.553434.7067

Tap 22.7693412.1574106.38543262.157440.5807

Tap 32.9835412.1574114.6141262.157443.7196

Tap 43.5757449.5534137.3641299.553445.8563

IV. Hasil Percobaan Grafik Laju Alir (Q) Terhadap Head Pompa (Secara Langsung)

Grafik Laju Alir (Q) Terhadap Head Pompa (Secara Tidak Langsung)

Grafik Laju Alir (Q) Terhadap Daya Dinamometer Pompa (No)

Grafik Laju Alir (Q) Terhadap Efisiensi Pompa () (Secara Langsung)

Grafik Laju Alir (Q) Terhadap Efisiensi Pompa () (Secara Tidak Langsung)

Lampiran Gambar PraktikumNo.Gambar AlatKeterangan

1.Satu Set Alat Pompa Sentrifugal (Dalam keadaan shutdown).

2.Skema aliran alat.

3.Tangki Pompa dengan

4.Beban yang digunakan untuk menyeimbangkan tangki pompa.

5.Pipa Ventutimeter.

6.Rumah pompa yang berisi setengah isian air.

7.

8.Pipa suction yang menghubungkan aliran masukan ke ruang pompa sentrifugal.

9.Pipa discharge yang mengalirkan air keluaran pompa.