3- Advice Mixing: How to choose your agitator VD

How to choose your agitator VD - VR ? The selection table allows you to choose an agitator according to two criterias: • Type of mixing • Volume of th...

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3- Advice

Mixing: How to choose your agitator VD - VR ? The selection table allows you to choose an agitator according to two criterias: • Type of mixing • Volume of the tank

Choice of agitators VD et VR

The choice between two sizes of agitator

The selection table shows 6 common types of water treatment mixing which correspond to an increasing level of difficulty from 1 to 6.

Below are some considerations when choosing the propeller/tank diameter ratio.

By analogy, they can be used as a base for the definition of agitators for other common applications in other industries. Within each level of difficulty are found sizes for 5 standard families of agitators : VDA, VLA, VRP, VRG, VRT.

Typical ratio values are between 0.2 and 0.6.

• VDA, VLA : Direct drive high speed agitators for 750 to 1500 rpm motors.

High values favour improved mixing action, notably in the vicinity of the walls (cleaning, heat transfer).

• VRP : Slow speed agitators with a propeller with 4 plane blades. • VRT, VRG : Slow speed agitators with Sabre® profiled propeller blades. For each type of appliance the detailed technical characteristics (motor power, absorbed intensity in water, speed, propeller diameter, max. shaft length and forces transmitted to the support) are presented in the technical data sheets. MILTON ROY MIXING staff are available to help you with the selection of your agitator.

These can drop below 0.2 for high speed VD, VL type appliances. The most common value for slow speed VR type appliances is 0.3.

Catalogue agitators selection table (without flocculation)

Tank capacity m3

1Storage denitrification

23Homogeneization Neutralization reagent preparing

0,30

VLA 2210

VRG 0020

0,50

VDA 2210

VRG 0020

0,80 1,40 2,00 3,0 5 6 9 12 16 21 27 34 40 50 70 100 130 170 200 270

VDA 2530 VRG 0020 VLA 3530 VRG 0020 VRP 1050 VRG 1040 VRG 3060

VRT 1080

VLA 3530

4Lime milk < 200 g/L Polyelectrolyte < 10g/L

VLA 5630 VLA 4630 VRG 0020

VRG 0020

VLA 4630 VRP 1050

VLA3530

5Sludge suspension < 20 g/l

VRG 0020 VLA 4630 VRP 1050 VRP1050

VLA 5630 VRG 0030

VLA 5630 VRG 2030

VRP 1050

VRP1050

VRG 1040

VRG 1040

VRG 1040 VRG 3060 VRP 2060

VRG1040 VRG3060 VRP2060

VRG 3060 VRP 2060

VRG 3060 VRP 2060

VRT 1080

VRT 1080

VRT1080

VRT1080

VRT 2080 VRT 2100

VRT 3080 VRT 2100

VRT 3120

VRT 3120

VRT 5140 VRT 6180 VRT 5180 VRT 6180 VRT 7200

VRT 8140 VRT 6180 VRT 5200 VRT 7200

6Flash mixing

VRP 1050 VLA 5630 VRG 0030 VLA 5630 VRG 2030 VRG 1040 VRG 3060 VRT 2080 VRT 3100 VRT 3120 VRT 4120 VRT 3140 VRT 8140

VRT 3120

VRT 3120

VRT 2160

VRT 2160

VRT 3140 VRT 2160 VRT 5180 VRT 5200

VRT 3140 VRT 5160 VRT 5180 VRT 5200

VRT3120

VRT2160 VRT5160 VRT5180 VRT5200

VRT 6180 VRT 7200 VRG 9160 VRG 9180

• For other criteria in the choice of type of mixing element, refer to the Advice data-sheet "Mixing : How to choose a mixing element ?". • If you do not find a suitable mixer, consult us.

Recommendations :

In the case of tanks with a height much greater than the diameter, or tanks of larger capacity, consult Milton Roy Mixing specialists. (1) VDA, VLA range • The appliances in this range are simple and economic for small capacity tanks (approx. 5 m3). • They must operate under load (respect the min. levels indicated on the technical data sheets. • The appliances in this range are not recommended for: - the agitation of shear sensitive products, - the agitation of fluids with a viscosity above 5 poise. • We especially recommend a VR range agitator for the preparation of polyelectrolytes .

(2) VRP range • The appliances of this range are economic for small and medium capacity tanks. • They can operate with the tank empty. (3) VRT, VRG range • The appliances of this range are well adapted for most applications and have a low energy consumption. • They can operate with the tank empty. (4) The selection is not suitable for flash mixing when the average time of stay in the tank is less than 2 minutes. Consult Milton Roy Mixing specialists.

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Advice - Mixing: How to choose your agitator VD- VR ? - 07/03 - All rights reserved for modification without prior notice - SIREN 331 253 625 - RCS MONTEREAU

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