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Safety - Hazmat - New Member

Join Date: Jun 2007
Posts: 19

CALCULATION OF AGITATOR

06/23/2007 1:11 AM

Dear sir,

I want to design a agitator drive with tank dia 3.6m and 6m ht.Tank blade is 2m dia.RPM is 36.Material inside tank is cement slurry with 1.65 specific gravity and 65%consistency.slurry level is 4m.How can i calculate the power of motor?

SANKAR

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Active Contributor

Join Date: Apr 2007
Posts: 16
#1

Re: CALCULATION OF AGITATOR

06/23/2007 10:23 AM

Well you can the power of motor = (total power/90%), and aproximate it to next comercial motor.


to calculate the total power than your agitator needs you must to calcule the work of the blade over time, so you need determinate a velocity and the geometry of the blade, to find the real work.

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Power-User

Join Date: Jan 2007
Location: Berlin (Germany)
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Good Answers: 1
#2
In reply to #1

Re: CALCULATION OF AGITATOR

06/24/2007 3:49 AM

I don`t think its possible to say less with so much words ...

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Associate

Join Date: Nov 2006
Location: michigan
Posts: 54
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#3

Re: CALCULATION OF AGITATOR

06/24/2007 1:00 PM

Power consumption is a function of fluid density, viscosity, rotational speed, and impeller diameter. Since the power required for a given system cannot be predicted theoretically, empirical correlations have been developed to predict the power consumption.

Do you know the viscosity of the slurry? From here one can calculate the Reynolds number and use power correlation diagrams to determine the power consumption.

Also one would need to know what kind of impeller is being used. For example there are flat six-blade turbine with disk impellers, propellers, and so on with or without baffles.

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Guru
Engineering Fields - Environmental Engineering - New Member APIX Pilot Plant Design Project - Member - New Member

Join Date: May 2007
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#4

Re: CALCULATION OF AGITATOR

06/24/2007 11:59 PM

Easiest way to do it would be to submit your requirements and parameters to your supplier's sales engineer and let him do the sizing for you. In this way, if he were to undersize it, the supplier would be liable for it, not you.

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Active Contributor

Join Date: Mar 2007
Location: US
Posts: 18
#5
In reply to #4

Re: CALCULATION OF AGITATOR

06/25/2007 6:43 AM

DVader1000, as an experienced electro mechanical designer, I must strongly disagree with this advice. That is a CYA (Cover Your A _ _ ) or managers mentality, not an engineers. If you rely totally on your supplier, and get bad advice, nobody wins. You might not get stuck with mixer that doesn't work, but you won't have one that works either (the original task). Failure!

Take the time to understand what is going on and check everything.

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Power-User
Popular Science - Weaponology - New Member United States - Member - New Member Engineering Fields - Automotive Engineering - ChemE in a ME world

Join Date: Mar 2007
Location: Detroit, MI USA
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#6
In reply to #4

Re: CALCULATION OF AGITATOR

06/25/2007 12:23 PM

A good (greedy) supplier will NEVER under size his design since cost would be directly proportional to size and to profit.

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Associate

Join Date: Nov 2006
Location: michigan
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#7

Re: CALCULATION OF AGITATOR

06/25/2007 2:15 PM

If you can supply the viscosity and type of agitator blade, i will figure out the power consumption for you and post it as well as how i got it.

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Alvin (1); ChemE119 (2); DVader1000 (1); NILOBA (1); uweka (1); Yani (1)

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