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Agitator Design

This document provides design considerations and thumb rules for agitator design. It lists 10 thumb rules for agitator design, such as the degree of agitation increasing with revolutions and impeller diameter. It also lists design parameters for a specific agitator design, including the vessel dimensions, agitator shaft length, liquid viscosity, and Reynolds number range. The goal is to mix the contents of a vertical cylindrical vessel that is 1000mm in diameter and 3000mm high, using a radial flow marine propeller agitator with a diameter of 333.3mm.

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Smruti
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522 views3 pages

Agitator Design

This document provides design considerations and thumb rules for agitator design. It lists 10 thumb rules for agitator design, such as the degree of agitation increasing with revolutions and impeller diameter. It also lists design parameters for a specific agitator design, including the vessel dimensions, agitator shaft length, liquid viscosity, and Reynolds number range. The goal is to mix the contents of a vertical cylindrical vessel that is 1000mm in diameter and 3000mm high, using a radial flow marine propeller agitator with a diameter of 333.3mm.

Uploaded by

Smruti
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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Signassure Services (India) Ltd.

27-11-2017
Agitator Design.xls

AGITATOR DESIGN
Thumb Rules

Sr No. Description
1 Degree of agitation increases with increase in number of revolutions of agitator and increase in impeller diameter.

2 For very large diameter storage tanks, the agitator is side entering.

3 When vessel is heated or cooled by coil or jacket, axial flow is prefered.

4 When the contents are to be mixed, radial circulation is prefered.

5 When both patterns of circulation are required, radual flow impeller is installed at the bottom of agitator shaft, while
radial flow impeller is installed at the center of agitator shaft.

6 Generally located centrally for better flow pattern. It is located off-centre if some part of vessel is occupied by internal
coil or some other pattern.

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Signassure Services (India) Ltd.
27-11-2017
Agitator Design.xls

AGITATOR DESIGN
Design Considerations

Sr No. Description Symbol Unit Value Remark


1 Type of Agitator Radial
2 Sub Type Marine Propeller Select from Radial sub-type
3 Diameter of Tank D mm 1000
mm 1
4 Diameter of Agitator d mm 0.3333333333
5 Baffles - - Baffles
6
7
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9
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Process and Mechanical Design of Agitator


Vessel Dimensions:
Vessel Orientation - - Vertical
Vessel Diameter ID/ L mm 1000
m 1
Vessel Height H mm 3000
m 3
Vessel Breadth B mm 2000
m 2
Vessel Volume Vv m3 2.4
Agitator Shaft Length La m 3.25
Process Data:
Specific Gravity of Liquid 1
Viscosity of Liquid µL cP 0.5
Pa.s 0.0005
Reynolds Number Range Re > 10000 Laminar Zone
Type
Axial Radial Slow-speed
Marine Propeller Disc blade turbine Paddle
Axial flow turbine Flat blade turbine Anchor
Turbo Propeller Backward blade turbine Anchor Paddle
Gate

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