Design of Agitator8 Batch Volume V = 46 Vessel Diameter T = 1.56 Agitator diameter D = 0.6

Agitation rpm N = 100 rpm

l = 3 m

No of Agitator n = 2

Properties of reactor contentsDensity = 1200 kg/m3Viscosity = 100 cp

Agitator Data7 Agitator Type

Calculation

Power Requirement

Power Number Np = 4.8Power Required P = 5.637 hpGland Loss (10%) = 0.564 hpTransmission loss (20%) = 1.240Total requirement P = 7.44 hpRounding to P = 7.00 hp

Agitator shaft diameterSelect shaft MOC = SS304Permissible shear stress, fs = 40 N/mm2Elastic limit , f = 260 N/mm2Modulus of Elasticity, E = 210000 N/mm2

Output Torque, Tc = 498917.1975 N-mmMax. torque, Tm = 748375.8 N-mmPolar modulus of section of c/s , Zp = 18709.395

= 95334.496d = 45.68 mm

= 3326 NBending moment, M = 9978344 N-mm

Overhang of agitator between shaft bearing & agitator

mm3(d)3 mm3

Force acting on radius from the axis of agitator shaft, Fm

Equivalent bending moment, Me = 9992356 N-mmElastic limit, f = 1068

Elastic limit is greater than permissible limit,Change agitator diameter, d

d = 95 mmElastic limit, f = 119

Elastic limit is within permissible limit

Deflection of Shaft (D):I = 3996171 mm4D = 36 mm

Critical Speed (Nc):

Nc = 158 rpm

Actual speed as % of critical speed = 63.1 %

Design is SatisfactoryChecked with critical speed.

70 to 130 % of the critical speed.

N/mm2

N/mm2

Note: Actual speed of agitator should be 40 to 65 % of the critical speed and should not be

Enter agitator dia in 'mm'

Actual speed of agitator should be 40 to 65 % of the critical speed and should not be

Enter agitator dia in 'mm'

Data

Drop Down 6: m 3Drop Down 7: m Drop Down 8: m Drop Down 9: Curved blade (P-6)