Dave Dickey Forum Moderator 304 Posts
Re: How fast should the agitator be in a mix tank?2 May 2012 at 1:29pm
For your application in a 72-inch diameter, 120-inch straight-side tank, you should be able to fill it with about 2,000 gallons of a 1.45 specific gravity, 6.2 cp liquid. Mixing with three 27.5 inch diameter pitched-blade turbines, the shaft length looks reasonable and the off-bottom locations for the impellers are helpful. The shaft diameter of 3.5 inches is larger than necessary (1.5 inches), but the extra size is no problem in this case.
The mixer should give you plenty of mixing intensity if it operates at 68 rpm, which will require a 5 hp motor. For somewhat less intensity, 3 hp at 56 rpm should work. If you think you need more intense mixing, then 7.5 hp at 84 rpm would be required.
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I am putting together a mix tank that has an agitator in it and I need some help figuring out how fast it needs to rotate and how big of a motor I need. The tank is round, 120 inches tall and 72 inches wide. The agitator shaft is 3.477 inches in diameter and 117 inches long. There are three impellers on the shaft one at 11 inches from the bottom, the next at 46.75 inches from the bottom and the last at 84.75 inches from the bottom. There are four blades on each impeller at a 45 degree angle; each blade is 27.5 inches long. The solution I am mixing has a specific gravity of 1.45 and a viscosity of 6.2 cP. This is far from my small area of knowledge and I would appreciate any help you could give me.
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