Agitator Cal

AGITATOR CALCULATIONS

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AGITATOR CALCULATIONS (PROCESS DESIGN ) Reynolds Number = (D2 N p) / u where D dia . Of agitator D= D1= D=

600 mm 1.9686 feet 23.6232 inches

N = Speed of agitator in rpm N= N1=

150 RPM 9000 RPH

3

p= density of fluid in lb/ft

p= p= u= u1=

Viscosity

963 60.1875 450 1089

Reynolds Number = (D12N1*p) / u1 Nre=

1927.684235

HORSE POWER CALCULATIONS

H.P. = (Np*N3*D5*S)/(1.524*1013) where Np= POWER NUMBER from Handbook of chemical engg. calculations by chopey or Ludwing vol.1 Or Practical process engg by Sandler density = 1 gm/cm3 density = 62.5 lb/ft3 Np= 1.7 S=Specific Gravity S= 1 D = Dia of agitator in inches D= 23.6232 23.6232 inch N= 150 RPM no.of blades n= 2 Power=

5.539382585 H.P.

H.P.=

7.913403692 H.P.

Considering 30% losses

Selected H.P.=

Sr.no

3

kg/m lb/ft3 cp lb/h.ft

IMPELLER TYPE

POWER NO:

1 2 3 4 5 6 7 8 9 10 11 12

Notes: 1 2 3

propeller(pitch=dia),no baffles propeller(pitch=dia),4 baffles propeller(pitch=2dia),no baffles propeller(pitch=2dia),4 baffles Flat 6 blade turbine,no baffles Flat 6 blade turbine,4 baffles Curved 6 blade turbine,4baffles Arrowhead 6 blade turbine,4 baffles 8 blade from turbine,4 baffles 2 blade flat paddle,4 baffles shrouded 6 blade turbine,4 baffles shrouded 6 blade turbine&stator ring

0.3 0.4 0.5 1 1.2 7 4.5 4 1.95 1.9 1.2 1.2

Add 10% for gland losses & find power input Add 20% transmission losses to power input & final total HP select nearest higher size motor model.