Calculation for Pressure Drop

CALCULATION OF PUMP HEAD ( ROUGH PIPE ) Ref.- Introduction to Chemical Engg. by Ghosal,Sanyal & Datta Fill data in Blue coloured cell Prepd. by - Dhananjay Thorat Flow req. (m3/hr) 50 RESULTS Flow req. (m3/s) 0.01389 Static Head ( m) Velocity (m/s ) 1.8 Velocity Head (m) Pipe Dia. (m.) 0.099116 Frictional head (m ) Corrected pipe dia. (m.) 0.08 Total head (m.of liq.column) Corrected velocity (m/s) 2.763452 Pump discharge pressure Static Head (m) ( + / - ) 5 in Kg/cm2 ( g) Density of fluid (kg/m3) -

1000

Viscosity of fluid (cp) -

1

Pipe length L (m) -

2

Fittings NRV ( Swing check ) No. of 450 - elbow No. of 900 - elbow No. of 1800 - close return bends No. of Tee used as elbow No. of Gate valve ( open ) No. of Globe valve ( open ) Std. Tee Sudden enlargement ( d/D = 1/4 ) ( d/D = 1/2 ) ( d/D = 3/4 ) Sudden contraction ( d/D = 1/4 ) ( d/D = 1/2 ) ( d/D = 3/4 )

0 0 3 0 1 1 0 0 0 0 0 0 0 0

Equivalent pipe length for fitting(m)-

15.44

Total pipe length L+ Le ( m ) -

17.44

Reynolds No.(NRe) Roughness of pipe 'e' (Micrometer) Friction factor -

221076.2 300 0.007139

Equivalent length 'Le' Data Fittings or valves

450 - elbow 900 - elbow 1800 - close return bends NRV ( Swing check ) Tee used as elbow Gate valve ( open ) Globe valve ( open ) Std. Tee Sudden Enlargement d/D = 1/4 d=Initial Dia. d/D = 1/2 D= Dia. After d/D = 3/4 enlargement Sudden contraction d/D = 1/4 D=Initial Dia. d/D = 1/2 d= Dia. After d/D = 3/4 contraction Where 'd' = Pipe diameter Roughness ' e ' Data Pipe MOC Steel Tube Rivetted Steel Galvanised iron Cast iron Asphalted cast iron Wood ,concrete Drawn Tube

5 -0.39 -2.42 2.19 0.2118

" Le" per fitting 15 x d 32 x d 75 x d 80 x d 90 x d 7xd 300 x d 65 x d 31 x d 19 x d 7xd 15 x d 10 x d 7xd

e micrometer 40 900 - 9000 150 300 120 200 - 2000 2

Suction side press Suction side press head Total suction head

1 10.330 12.52

Kg/cm2(a) mlc mlc

Liq. P0 at pumping Temp Liq. P0 at pumping Temp NPSH(A)

523 7.11 5.409

mmHg (a) mlc mlc

CALCULATION OF PUMP HEAD ( ROUGH PIPE ) Ref.- Introduction to Chemical Engg. by Ghosal,Sanyal & Datta Fill data in Blue coloured cell Prepd. by - Dhananjay Thorat Flow req. (m3/hr) 50 RESULTS Flow req. (m3/s) 0.01389 Static Head ( m) Velocity (m/s ) 2 Velocity Head (m) Pipe Dia. (m.) 0.09403 Frictional head (m ) Corrected pipe dia. (m.) 0.08 Total head (m.of liq.column) Corrected velocity (m/s) 2.763452 Pump discharge pressure Static Head (m) 7 in Kg/cm2 ( g) 3

Density of fluid (kg/m ) -

1000

Viscosity of fluid (cp) -

3

Pipe length L (m) -

70

Fittings NRV ( Swing check ) No. of 450 - elbow No. of 900 - elbow 0 No. of 180 - close return bends No. of Tee used as elbow No. of Gate valve ( open ) No. of Globe valve ( open ) Std. Tee Sudden enlargement ( d/D = 1/4 ) ( d/D = 1/2 ) ( d/D = 3/4 ) Sudden contraction ( d/D = 1/4 ) ( d/D = 1/2 ) ( d/D = 3/4 )

1 0 5 0 1 1 0 0 0 0 0 0 0 0

Equivalent pipe length for fitting(m)-

26.96

Total pipe length L+ Le ( m ) -

96.96

Reynolds No.(NRe) Roughness of pipe 'e' (Micrometer) Friction factor -

73692.05 300 0.00741

Equivalent length 'Le' Data Fittings or valves

450 - elbow 900 - elbow 1800 - close return bends NRV ( Swing check ) Tee used as elbow Gate valve ( open ) Globe valve ( open ) Std. Tee Sudden Enlargement d/D = 1/4 d=Initial Dia. d/D = 1/2 D= Dia. After d/D = 3/4 enlargement Sudden contraction d/D = 1/4 D=Initial Dia. d/D = 1/2 d= Dia. After d/D = 3/4 contraction Where 'd' = Pipe diameter Roughness ' e ' Data Pipe MOC Steel Tube Rivetted Steel Galvanised iron Cast iron Asphalted cast iron Wood ,concrete Drawn Tube

POWER REQUIRED 7

Pump efficiency

70

%

0.39

Pump Power Motor efficiency Motor required

3.7 80 7.2

BKW % HP

Discharge point press Discharge point press ∆p across CV ∆p across FT ∆p across Schenk filter Total Discharge head

1 10.3 0 0

Kg/cm2(a) mlc mlc mlc

31.70

mlc

Total Suction Head

12.52

mlc

Diff Head

19.18

mlc

13.98 21.37 2.0688

" Le" per fitting 15 x d 32 x d 75 x d 80 x d 90 x d 7xd 300 x d 65 x d 31 x d 19 x d 7xd 15 x d 10 x d 7xd

e micrometer 40 900 - 9000 150 300 120 200 - 2000 2

0