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ProTips Education Center

Single-Source Resource for Industrial Water Treatment

New educational center dedicated to providing you with resources, best practices and product information for the industrial water treatment market.

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Neptune Markets

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Neptune delivers pump systems for use in the reliable and safe handling of chemical fluids used for water treatment applications in municipalities, general industries and agriculture.

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ProTips Education Center

Single-Source Resource for Industrial Water Treatment

New educational center dedicated to providing you with resources, best practices and product information for the industrial water treatment market.

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Mixer Selection Guides

Like any piece of industrial equipment, portable mixers are most efficient, effective and reliable when the proper model and style is used for a particular mixing or blending task. That’s why it’s imperative to consider several operational variables when specifying portable mixers.

To help you select the proper Neptune mixer for your application, we have developed the following guides to provide you with valuable information such as specifications, dimensions and dimensional drawings.

The charts and information below are intended to provide some basic guidelines for selecting the proper Neptune mixer(s) that offers mild blending of various viscosity liquids in different size tanks.

The information provided is based on an approximate mix/blend time of two liquids for 30 minutes, with both liquids already in the tank. Mixing times will be shorter if one liquid is added to a second liquid while the mixer is operating. Powders should always be added while the mixer is running.

These charts also apply to the suspension of solids with settling velocities of less than one foot per minute.

For more rapid or vigorous mixing, use a mixer one or two sizes larger.

Dual propellers are recommended for tanks 1,000 gallons (3,785.4 liters) and larger at viscosities of 1,000 cPs and higher.

View Neptune Portable Mixers Selection Guide

What to Know When Specifying Large Portable Mixers

The best large portable mixer selection is ultimately the one that can satisfy the specific needs of your operation as related to the following categories:

  • Style: There are four basic styles: pail, which has the smallest capacity, drum, tote and light- or heavy-duty bulk tanks, which have the highest capacity. The most commonly used in industrial operations are the drum and tank styles. Most models are either gear-driven with speeds of 350 or 420 revolutions per minute (rpms), or direct-drive, with speeds of 1,750 rpm.
  • Mounting: While some mixers can be permanently mounted to the drum, tote or bulk tank, in most instances a mounting clamp is used to attach the mixer to the vessel. There are three common portable mounting-clamp styles: C Clamp, which has an adjustable angle of entry that is controlled by a ball-and-socket adjustment design; Angled Riser, which provides a fixed 10-degree angle of entry into the mixing vessel; and Flange Mount, which attaches to a flange that is located on the lid of the drum, tote and bulk tank.
  • Props: “Neptune recommends Square Pitch propeller, which is the most efficient prop and can displace eight inches of liquid in one revolution for tanks up to 5,000 Gallons” said Gurmeet Kharbanda, Director Product Management - Neptune.
  • Shafts: Shaft lengths for most mixers are determined by critical speed. Operating at a rotational speed that is equal or close to critical speed will cause a multiplication factor on normal runout, but this will be mitigated by the speed damping that is produced by the liquid. There are, however, certain circumstances that will produce abnormal shaft vibration. These include operating the mixer through drawoff or at drawoff for a significant period of time, during the drawdown of solids, and at a natural frequency when mixing extremely light liquids that do not produce a damping effect.

Also contributing to the style of large mixer that should be specified are a number of operational characteristics, including mixing rate, or the time it takes to completely “turn” the product in the mixing vessel; mixer position, whether side-mounted, center-mounted, angled, offset or requiring baffles; and liquid type, with the liquid’s viscosity and particulate levels determining proper style and orientation.

Viscosity cPs Up To
50 Gallons 
(189.3 Liters)
Up To
100 Gallons
(378.5 Liters)
Up To
200 Gallons
(757.1 Liters)
Up To
500 Gallons
(1,892.7 Liters)
Up To
1,000 Gallons
(3,785.4 Liters)
Up To
2,000 Gallons
(7,570.8 Liters)
Up To
3,000 Gallons
(11,356.2 Liters)
Up To
5,000 Gallons
(18,927.1 Liters)
≤1 BN-3.0 BN-3.0 JD-2.0 JD-2.0 JG-2.0 JG-2.0 JG-2.0 JG-4.0
≤100 BN-3.0 BN-3.0 JD-2.0 JG-2.0 JG-2.0 JG-2.0 JG-3.0 JG-5.0
≤300 BN-3.0 BN-3.0 JG-2.0 JG-2.0 JG-2.0 JG-4.0 JG-5.0 JG-5.0
≤500 BN-3.0 JG-2.0 JG-2.0 JG-2.0 JG-3.0 JG-5.0 JG-6.0 JG-7.0
≤1,000 JD-2.0 JG-2.0 JG-2.0 JG-2.0 JG-4.0 JG-6.0 JG-7.0 JG-8.0
≤2,000 JG-2.0 JG-2.0 JG-3.0 JG-3.0 JG-5.0 JG-6.0 JG-8.0 JG-9.0
≤3,000 JG-2.0 JG-2.0 JG-4.0 JG-4.0 JG-6.0 JG-8.0 JG-9.0
≤5,000 JG-2.0 JG-2.0 JG-5.0 JG-5.0 JG-7.0 JG-8.0
≤15,000 JG-3.0 JG-3.0 JG-5.0 JG-8.0 JG-9.0 JG-9.0
≤25,000 JG-6.0 JG-7.0 JG-8.0 JG-9.0

For full specifications and information on the above mixers: Series JG, Series JD, Series BN

What to Know When Specifying Small Portable Mixers

Prior to choosing a small portable mixer for a particular task, several elements should be considered:

  • Size of the batch: Small portable mixers are best used for batch sizes up to 100 gallons. Larger sizes, 200 gallons or higher, become too cumbersome and problematic for small mixers, which don’t have the power to effectively mix that kind of volume. Compatible small batch mixers from Neptune include its A and B Series, the BN Series, the BC and BF Series and L Series.
  • Viscosity of the components: Similar to the batch size, the viscosity of the components is another parameter that must be considered for small mixers. A viscosity CPS of less than 500 is ideal for small mixers, such as the BN Series, which is the premier line of small direct drive mixers for mixing small batches of low viscosity fluids. The JD Series can also be used at the pinnacle of the batch and viscosity threshold for small mixers, which would be a batch size of 100 gallons and a viscosity at or near 500.
  • Final products: The final mixed products are another factor when determining if a small or larger mixer is needed for the job. If the final mixed product does not have a high viscosity or a large volume of product, then a small mixer will handle it effectively.
Connection Under
50 Gallon
50 Gallon 100 Gallon 55 Gallon Drum 55 Gallon Drum
High Viscosity
Tote / IBC containers Pail / 5 Gallon / Specialty Notes
Clamp L-1-CL     F-1.X     JGT-3.X ***    
A-1.0 B-2.X B-3.X F-2.X     JGT-4.X ***    
  B-4.0* B-4.0* F-3.X     JGT-5.X ***   JGT VISCOSITY LIMIT 5000 CPS
BN-1.X BN-2.X BN-3.X F-4.0*     JGT-3.4* ***    
  BN-4.0* BN-4.0*       JGT-5.4* ***    
Bung       E-1.X H-2.X HGS-2.X HGL-3.X RAB-3.X   HGL & RAB VISCOSITY LIMIT 5000 CPS
      E-2.X H-3.X HGS-3.X HGL-5.X RAB-5.X   H mixer limit HGS mixer limit
      E-3.X H-4.0* HGS-4.0* HGL-6.X RAB-6.X   2.X -1,000 CPS 2.X -4,000 CPS
      E-4.0* H-5.0 HGS-5.0 HGL-4.0* RAB-4.0*   3.X -4,000 CPS 3.X -16,000 CPS
        H-6.0 HGS-6.0 HGL-7.0* RAB-7.0*   5.X -6,000 CPS 5.X -24,000 CPS
        H-7.0* HGS-7.0*       6.X -8,000 CPS 6.X -32,000 CPS
                  7.X -8,000 CPS 7.X -32,000 CPS
Bracket L-1-BK           RGT-1.X **    
            RGT-2.X **    
            RGT-3.X **   RGT VISCOSITY LIMIT 5000 CPS
            RGT-1.4* **    
            RGT-3.4* **    
Flange     BF-5.4*              
Pipe Clamp                 B-4.0P* VISCOSITY LIMITS 1000 CPS
Pail Rim Clamp                 PAM-6.0*  
Handle Bar                 HAJ-3.X*  
Hand Held                 HH12*  
                HH55* HH55 55 gallon model

X - Electric motors: specify specific motor - Voltage, phase, enclosure (TEFC / Explosion proof).
Motor Examples: BN-3.0 = 1/2hp-1ph-115/220-TEFC motor | E-2.3 = 1/3hp-3ph-220/460-EXP motor.
*Air motor models.
**Series RGT optional adjustable mounting bracket fits flat top, square edge containers from 31-1⁄2" to 50" wide. Available in painted steel / Model RGT-BKT.
***Series JGT optional adjustable mounting bracket fits 32" to 50 1⁄2" wide containers. Model DTS, Steel.
PVC coatings available.
Unless noted viscosity limits are water like materials.

Proper Mixer Mounting and Positioning

In most applications involving small mixing tanks of 1,000 gallons (3,785.4 liters) or less, the mixer is clamped to the side of the tank. Optimum mixing will be achieved when the mixer is angled from the tank wall, either off-center (figure 1) or on-center (figure 2). Improperly mounting a portable mixer will greatly lessen mixing efficiency, cause vibration, and could possibly damage the mixer.

Angling off-center is preferred when good material turnover is required, as in mixing slurry. Angling on-center is desired for more gentle mixing and when vortexing must be minimized.

Larger size tanks may require that a mixer be mounted directly in the center of the tank with the shaft vertical (figure 3). When a mixer is used in this arrangement, baffles are recommended to prevent the contents of the tank from turning in the direction of the mix. If this occurs, mixing action will be poor.

Such baffling will avoid vortexing and allow mixing to be as thorough as possible. Neptune suggests that four baffles be used, located 90° apart and sized approximately 1/12 of the tank diameter. The baffle should not fully extend to the bottom of the tank and a gap should be provided between the baffle and the tank wall.


FIGURE 1 – Angling the portable mixer off-center is the position recommended by Neptune for rapid turnover of tank contents and good bottom washing.


FIGURE 2 – On-center angling will produce good mixing with minimum vortexing. Tank contents turn over thoroughly but gently.


FIGURE 3 – For mixing in larger tanks, the mixer is often placed vertically on-center. In this configuration, baffles are recommended to prevent the contents of the tank from rotating, avoid vortexing and achieve good mixing and top-to-bottom turnover.