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Agitator Calculation. - SPL

This document provides calculations to size the power and shaft for a pump. It details the vessel dimensions, fluid properties, turbine dimensions, and calculates the power using equations that factor in Reynolds number, power number, and service factors. It then calculates the continuous and maximum torque on the shaft, equivalent bending moment, and stress in the shaft to determine the proper shaft diameter.

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Abarajithan Rajendran
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655 views2 pages

Agitator Calculation. - SPL

This document provides calculations to size the power and shaft for a pump. It details the vessel dimensions, fluid properties, turbine dimensions, and calculates the power using equations that factor in Reynolds number, power number, and service factors. It then calculates the continuous and maximum torque on the shaft, equivalent bending moment, and stress in the shaft to determine the proper shaft diameter.

Uploaded by

Abarajithan Rajendran
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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POWER CALCULATION & SHAFT SIZING

1 MOC SS 316L
Vessel Details
Working Volume
Capacity
Tank Diameter D
Tank Height H
H/D
Working volume height
Density ρ
Viscocity µ
Tip speed
Speed of rotation n
Rotation in rpm
Turbine Dimensions

Turbine dia,0.3D Da
Blade Width,0.2Da w
Reynolds Number,da²xnxρ / µ NRE
Power Number, Np
C/(NRE)m, or from graph
For Steady Flow
Pa,Npxn³xρxDa5
Service Factor
Power Power = Service Factor x Pa
Pstart Pstart =2 x Power
Pinstalled Pinstalled = Pstart x (1.2/0.95)
Total
Proposed

Shaft diameter
Continuos Torque,Pinstalled*75*60/(2ΠN) Tc

Max Torque,(1.5 to 2.5)Tc Tm


the eq. bending moment of the shaft,1/2(M+√(M +Tm )
2 2
Me
The force resisting the max torque,Tm/0.75Rb Fm
The max bending moment occurs at the bearing,FmxL M
Length of Shaft from impeller to Bearing L
The stress developed due to equivalent bending moment,Me/Z
Z
ds
L 2.5 KL
L
m 1.3
m 1.5
1.2 : 1
m
kg/m3 1000
kg/ms 0.013
m/s 17
rps 12
rpm 750

m 0.433
m 0.087
180467

0.380
Propeller
11324
1.25
er = Service Factor x Pa 14154.5
rt =2 x Power 14154.5
talled = Pstart x (1.2/0.95) 17879.4
HP 47.68
HP 50.00 non gassed system

Kgf-m 45.6 446.6 Nm

Kgf-m 114 1117 Nm


Kgf-m 706
Kgf 701
Kgf-m 701
1.00
Kgf-m 1.73E+07
4.07E-05
0.0609 m
65 mm

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