SidangTugasAkhir. Pompa dengan Motor NEWMAN Electric Motor 18030V1/5 1,5 hp; 2850 RPM

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1 SidangTugasAkhir Pompa dengan Motor NEWMAN Electric Motor 18030V1/5 1,5 hp; 2850 RPM

2 Sumber: Sumber: Berperan dalam berbagai sektor industri Parameter penting dalam pemilihan pompa 20% kebutuhan listrik dunia 25% - 50% penggunaan energi operasi industri (US DOE, 2004). Sumber:

3 Reaktivasi Modul Kerja Alat Penambahan Fasilitas Pemahaman mahasiswa

4 Fasilitas analisa perpipaan minim Analisa performa, meliputi: Usia alat sudah tua, perawatan minim Head,efisiensi kerja pompa Head loss perpipaan Karakteristik kerja sistem

5 Mengevaluasi performansi dari sistem Mengevaluasi efisiensi dari kinerja pompa Penambahan fasilitas praktikum di laboratorium Menghasilkan modul praktikum

6 f e/d η f-re

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8 γ + V 2 1 2g + z 1 + H p = p 2 γ + V 2 2 2g + z 2 + H lt p 1 H lt = H L + H m H L = f L D V 2 2g H m = K V2 2g ; H m = f L e D V 2 2g

9 Haaland eq. - Laminar flow: Moody Diagram f = 64 Re Darcy Weisbach eq. - Turbulen flow: 1 f = 1, 8log 10 e D 3, 7 1,11 + 6, 9 Re Fox, et al, 2003

10 Fox, et al, 2003 H e a d l o s s s u d d e n e n l a r g e m e n t : 2 V u.s h ls = k ls 2g H e a d l o s s s u d d e n c o n t r a c t i o n : 2 V d.s h lc = k lc 2g H e a d l o s s e l b o w : 2 V u.s h le = k le 2g Fitting Standard Tee Thru flow 3/4 in 3/2 in Thru branch 3/4 in 3/2 in K L Gate valve, fully open 0.2 3/4 open 1.0 1/2 open 5.6 1/4 open 17.0 Standard Elbow 90 o 0.75 Elbow, 45 o Long radius elbow, 90 o Short radius elbow, 90 o 0.8 Close return bend, 180 o 1.25 Rotary meter 10 Westaway dan Loomis, 1984 Disk or Woble Meter

11 C d = Q A 1 1 β 4 p ρ 1 h v = 10% p v ρg

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14 I II III IV : PVC Pipe D = 3 2 in ; L = 3 m : PVC Pipe D = 3 4 in ; L = 3 m : Pipe with reducer pipe Acrylic pipe D = 1 2 in ; L = 3 m (substitute) : Fitting and restriction flow meter long radius elbow 90 o, short radius elbow 90 o,elbow 45 o, venturimeter, pipa sudden contraction dan pipa sudden enlargement.

15 Sumber:

16 f-re p = SG Hg ρ g h f = 2 D L. p ρv 2 D = 3 2 in; D = 3 4 in; D = 1 2

17 K L -Re/C d - Re p = SG Hg ρ g h H m = K L V 2 2g ; H m = f L e D V 2 2g C d = Q 1 β 4 1 A 1 p ρ

18 Perhitungan Pump Head H p = p 2 p 1 γ + V V 1 2g + h g Perhitungan Head Pipeline H pl = H L + H m + H s

19 η p = W P B P = γqh η. E P = ρgq ph p η. VI cos φ dimana: W P : daya hidrolik B P : daya poros E P : daya listrik ρ : massa jenis air g : percepatan gravitasi bumi Q p : debit pompa H p : head pompa η : efisiensi motor V : tegangan listrik I : arus listrik cos φ : koefisien kerja motor η = P Load ; Load = I V 100% E p I r V r

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21 Fluid = Temperature = Pressure = Density = Viscosity = Fixed speed = Flow = Head = Efficiency = NPSHr = (at least 3 data) Material = Roughness = Int. Diameter = Fittings = properties

22 Parameter Line I Line II Line III Debit Aliran (Q) (Q) min 10 L min (Q) max 70 L min Q 2 L min 10 L min 10 L min 1, m 3 s 1, m 3 s 1, m 3 s 60 L min 50 L min 11, m 3 s 10, m 3 s 8, m 3 s 2 L min 2 L min m 3 s m 3 s m 3 s Panjang pipa (L) 3 m 3 m 1 m Diameter (D) 3 2 in 3 4 in 1 2 in Menentukan friction factor f = 2 D L. p ρ V 2 Menentukan wall roughness e D = 3, ,8 f 6, 9 Re 1 1,11 0, 0381 meter 0, meter 0, 0127 meter SG Hg = 13,6ρ water ; T = 25 o C; ρ water = 997 kg/m 3 ; µ = 8, N.s/m 2

23 1,0 0,12 0,03500 Kurva Hubungan f f - - Re pada Line III I 0,9 0, ,1 0,8 f 0, ,7 0,08 0,6 0, ,5 0,06 0, ,4 0,04 0,3 0,01000 f 0,2 0,02 0, ,1 0, Re Re Re

24 Kurva Hubungan e/d dan Re pada Line I Kurva Hubungan e/d dan Re pada Line II e 1,2 1,0 0,8 0,6 0,4 0,2 0, Re e 0,12 0,10 0,08 0,06 0,04 0,02 0, Re e 0,004 0,003 0,002 0,001 0,000 Kurva Hubungan e/d dan Re pada Line III Re e = e = e = e D D = 0, ,1mm = 0,0427mm e D D = 0,042 19,05mm = 0,80mm e D D = 0, ,7mm = 0,012mm

25 0,16 0,14 f - Re (Line III) f - Re (Line II) f - Re (Line I) 0,12 64/Re 0,10 f = 1,8log e D 3,7 1, Re 2 f 0,08 0,06 0,04 0,02 0, Re

26 Parameter Long Standard Sudden Sudden Radius Radius Elbow 45o Enlargement Contraction Elbow 90 o Elbow 90 o Debit minimal L/min [m 3 /s] 1,67 1,67 1,67 1,67 1,67 Debit maksimal [L/min] [m 3 /s] 11,7 11,7 11,7 11,7 11,7 Q [L/min] [m 3 /s] Diameter pipa [in] 3/4 3/4 3/4 - - [m] 0, , , ,01905 (inlet) 0,04808 (inlet) Jumlah fitting (n) Menentukan friction factor K L = 2 p ρ V 2 SG Hg = 13,6ρ water ; T = 25 o C; ρ water = 997 kg/m 3 ; µ = 8, N.s/m 2

27 Hubungan K L-el90 - Re pada Long Rad Elbow 90 o Hubungan K L-S.el90 - Re pada Stand. Rad. Elbow 90 o 1,6 1,2 1,4 1, ,8 K 0,8 0,6 0,4 0,2 K 0,6 0,4 0, Re Re Hubungan K L-el45 - Re pada Elbow 45 o 3 K 2,5 2 1,5 K L-L.el90 = 0,71 K L-S.el90 = 0,60 1 0,5 K L-el45 = 0, Re

28 3 Long rad. Elbow 90 2,5 Standard rad. Elbow 90 2 Elbow 45 K L 1,5 1 0, Re

29 Hubungan K S-enl - Re Suddden Enlargement Pipe Hubungan K S-con - Re Sudden Contraction Pipe K 6 K Re Re K L-sud.enl = 0,76 K L-sud.cont = 26,39

30 C d 0,007 0,006 0,005 0,004 0,003 Kurva Hubungan C d dan Re pada Venturimeter Dimana: Menentukan nilai C d C d = Q A 1 1 β 4 p ρ C d = 0, ,002 0, Re Head loss pada venturimeter C d = 10% p ρg (Miller, 1996)

31 Grafik Karakteristik Kerja Pompa 25 30% 20 25% 20% Head (m) % Debit (L/min) Q-H Hpl I Hpl II Hpl III Efisiensi 15% 10% 5% Efisiensi (η)

32 η p = W p B p B P = ηe P W P = γq p H p η = P r Load E p Load = B P = P r Load E P. E P W P = ρgq p H p I I r V V r B P = P r I I r V V r η p = W p B p = ρgq ph p I I. V r V r P r

33 Fittings Keterangan K Through Tee D = 3/2 in 0,42 D = 3/4 in 0,5 1 buah 3 buah Pipeline I II III buah 2 buah Branch Tee D = 3/2 in 1,26-1 buah 1 buah D = 3/4 in 1,5 1 buah 2 buah 1 buah Standard Elbow 90 o D = 3/4 in 0,75 3 buah 3 buah 4 buah Long Elbow 90 o D = 3/2 in 0,34 1 buah 1 buah 1 buah D = 3/4 in 0,4 2 buah 2 buah 2 buah Return Bend D = 3/4 in 1,25 1 buah 1 buah 1 buah Gate Valve (Fully Open) D = 3/4 in 0,2 3 buah 3 buah 3 buah Rotameter 10 1 buah 1 buah 1 buah Ktot D(3/2 in) = 0,76 D(3/4 in) = 15,65 D(3/2 in) = 1,6 D(3/4 in) = 16,65 D(3/2 in) = 1,6 D(3/4 in) = 18,15 K entrance = 0,2; K exit = 1

34 Pipe Flow Expert v Debit (Q) = 0,0011 m 3 /det = ±66 L/min Head (H) = 17,001 m Efisiensi (%) = 28,4 Analisa Manual Debit (Q) = 0,0011 m 3 /det = 64 L/min Head (H) = 17,100 m Efisiensi (%) = 29,0

35 Pipe Flow Expert v Debit (Q) = 0,0009m 3 /det = ±54 L/min Head (H) = 18,339 m Efisiensi (%) = 26,2 Analisa Manual Debit (Q) = 0,0009 m 3 /det = 54 L/min Head (H) = 18,4 m Efisiensi (%) = 26,0

36 Pipe Flow Expert v Debit (Q) = 0,0008 m 3 /det = ±48 L/min Head (H) = 19,02 m Efisiensi (%) = 23,8 Analisa Manual Debit (Q) = 0,0008 m 3 /det = 48,5 L/min Head (H) = 19,0 m Efisiensi (%) = 25,3

37 f e/d 1 Re K L 1 Re Pada pipa line II (PVC D = 3/4 in),e/d = 0,04193 Pipe line I (PVC D = 3/2 in),bep = 29%,17,1 m Pipe line II (PVC D = 3/4 in), BEP = 26%,18,4 m Pipe line III (PVC D = 1/2 in),bep = 25,3%, 19,0 m

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39 Surface (m) 10-3 Absolute Roughness Coefficient - k - Copper, Lead, Brass, Aluminum (new) PVC and Plastic Pipes Stainless steel Steel commercial pipe Stretched steel Weld steel Galvanized steel Rusted steel (corrosion) New cast iron Worn cast iron Rusty cast iron Sheet or asphalted cast iron Smoothed cement Ordinary concrete Coarse concrete Well planed wood , Ordinary wood (feet)