Tank Mixing Eductors

Tank Eductors (also referred to as circulating tank eductors & tank liquid agitators) provide an effective way to mix liquids in open or enclosed tanks. They produce an intimate mixing action between the components of a liquid, while keeping the contents of the tank in constant motion. In many cases they produce a mixing action that cannot be duplicated using mechanical methods. Tank eductors can handle a variety of viscosities and types of liquids, including slurries and suspensions. Their thorough mixing action makes them especially useful for maintaining uniform liquid characteristics throughout the tank contents , such as temperature, pH, or solids distribution. The tank eductor is also used to prevent separation of non-mixable liquids or stratification of liquids having different specific gravities. Tank eductors offer low initial cost, light weight and easy installation. They are inherently non-clogging and with no moving parts, require little or no maintenance . Tank eductors allow the use of a smaller recirculating pump than normally would be needed to move a given volume of liquid. This saves energy while providing more effective mixing and circulation. They are available in materials to suit a variety of applications in food, chemical, refining and other process industries.

How tank mixing eductors work
A predetermined amount of liquid (called operating fluid) is pumped through a header to one or more tank eductors submerged inside the tank. Depending upon the application , the operating fluid can be liquid drawn from the tank, or it can be a second liquid from another source that is to be mixed with the tank contents. As the operating fluid leaves the nozzle of the tank eductor, it entrains material from the tank. The operating fluid and entrained material are thoroughly mixed inside the parallel section of the tank eductor before being discharged. The discharge flow, or plume, continues the mixing and agitation o f the liquid throughout the tank.

Tank Eductor Features:

Standard features and available options

  • Optimized flow paths enable the tank eductor to maintain a high "entrainment ratio" (the ratio of fluid sucked into the motive fluid) while maximizing the hydraulic efficiency (the ratio of hydraulic power at the outlet of the tank eductor to the hydraulic power at the inlet) to generate an optimum flow field from the greatest flow amplification.
  • No moving parts in the eductor, minimizing maintenance expenses.
    Optimum flow field enables more activity within the tank than competitive units without changing pumps.
  • Compact design and ease of mounting keeps the tank eductor from interfering with other tank equipment.
  • "In-tank" mounting eliminates need for costly, complex mounting structures above tanks.
  • Tank eductors can be used in a wide variety of open vessels or closed tanks.
    Eliminates stratification and promotes a homogeneous tank with relation to pH, temperature, solids or gas dispersion, and distribution of chemicals.
    A predetermined amount of liquid (called operating fluid) is pumped through a header to one or more tank eductors submerged inside the tank. Depending upon the application , the operating fluid can be liquid drawn from the tank, or it can be a second liquid from another source that is to be mixed with the tank contents . As the operating fluid leaves the nozzle of the tank eductor, it entrains material from the tank. The operating fluid and entrained material are thoroughly mixed inside the parallel section of the tank eductor before being discharged . The discharge flow, or plume, continues the mixing and agitation o f the liquid throughout the tank.

Edathon Coating Option

  • Excellent Corrosion Resistance
    Excellent Abrasion Resistance
    300° F Continuous Service
    Good Non-Stick Characteristics
  • Excellent Dielectric Insulation
    Radiation Resistant

 

This coating is applied via electrostatic powder spray or fluidized powder bed. In addition to possessing the high chemical and temperature resistance which all fluoropolymers are noted for, Edathon's strengths, radiation resistance, wear resistance, and creep resistance are significantly greater than those of other fluoropolymers such as PTFE, FEP, or PFA.

Ultratuf Coated NozzleULTRATUF Coating Option

Fusion Bonded Coating

  • Machinable
  • Excellent Abrasion Resistance
  • 300° F Continuous Service
  • Self-Lubricating
  • Electrically Insulating
  • Impact Resistant
  • Withstands Saltwater Environment

 

At last, a single coating offering abrasion resistance so excellent that it can withstand the punishment of sand blasting and yet be used on medical instruments subjected to repeated sterilization. This unique coating can be applied from 5-35 mils thick and has found many areas of use.

Standard materials TLA's are cast or fabricated in: bronze, 316 stainless and carbon steel. Cast units range from IPS 3/4 to 2. Larger sizes and other materials are fabricated. Consult the factory for details.

Standard body connection for 3/8 and 3/4 units is male NPT and for 1-1/2 through 3, female NPT. Over 4" is flanged. Optional connections include female/male NPT, butt weld, socket weld, VictualicTm, sil-braze, and flanged.

Standard Materials:

* Carbon Steel
* 316SS
* Bronze
* PVC
* PPL
* PVDF

Custom Tank Eductor Manifold Designs

We can design manifolds customized to your unique application(s). Drawing from our years of experience will help take the guess work out of your layout design(s).

Custom Manifolds

 
Calculating Turnover Rates

When turnover rates are used to calculate mixing it is important to consider the viscosity of the fluid and the amounts of solids present. It also important to consider the size, weight and shape of the tanks which may limit the free flow of the mixing solids to maintain suspension. The viscosity or odd flow field within the tank, and suspensions that separate easily may demand constant mixing. In most cases, the tank eductor will usually provide a homogeneous mixture of the vessel in one to three turnovers.

When operated with pressure drops between 10 and 60 PSI, the tank eductor will entrain at least 4 times as much tank liquid as the motive liquid used. For pressure drops over 60 PSI, the amount of fluid entrained by the tank eductor remains almost constant. Up to 5 to 1 Entrainment.

To calculate the required turnover time for the tank with pressure drops between 10 and 60 PSI, divide the tank volume by the result of the number of eductors times the outlet flow (GPM).

Show TableTank eductor performance/Sizing Table (click to show/hide table)
Size IPS Pressure Difference, PSI
10 20 30 40 50 60 70 80 90 100 120 140
  Motive Flow (GPM) 7.1 10.0 12.3 14.2 15.8 17.4 18.7 20.1 21.3 22.4 24.6 26.5
3/8" mnpt Outlet Flow (GPM) 35 50 61 71 79 87 88 90 91 92 94 96
  Max. Plume Length 4 8 12 16 22 29 36 43 50 58 72 86
3/4" mnpt Motive Flow (GPM) 15.4 21.8 26.7 30.8 34.5 37.8 40.8 43.6 46.3 48.8 53.4 57.7
Outlet Flow (GPM) 77 109 134 154 172 189 192 195 197 200 204 209
Max. Plume Length (FT) 5 11 17 24 33 42 53 64 74 85 106 127
  Motive Flow (GPM) 30.8 43.6 53.4 61.6 68.9 75.5 81.5 87.2 92.5 97.5 107 115
1-1/2" fnpt Outlet Flow (GPM) 154 218 267 306 345 378 384 389 395 400 409 417
  Max. Plume Length (FT) 7.5 16 24 34 46 60 75 90 105 120 150 180
2" fnpt Motive Flow (GPM) 61.6 87.2 107 123 138 151 163 174 185 195 214 231
Outlet Flow (GPM) 308 436 534 616 689 755 767 778 789 799 818 835
Max. Plume Length (FT) 11 23 34 48 65 85 106 127 148 170 212 255
  Motive Flow (GPM) 142 201 246 283 317 347 375 401 426 449 491 531
3" fnpt Outlet Flow (GPM) 708 1,003 1,228 1,417 1,585 1,737 1,764 1,790 1,815 1,836 1,880 1,920
  Max. Plume Length (FT) 16 34 51 73 99 129 161 193 225 257 322 386
4" flg Motive Flow (GPM) 246 349 427 493 551 604 652 698 740 780 856 920
Outlet Flow (GPM) 1232 1744 2136 2448 2760 3024 3072 3112 3160 3200 3272 3336
Max. Plume Length (FT) 22 41 60 95 132 164 196 228 260 295 360 424
6" flg Motive Flow (GPM) 493 698 854 986 1102 1208 1304 1395 1480 1560 1712 1840
Outlet Flow (GPM) 2464 3488 4272 4896 5520 6048 6144 6224 6320 6400 6544 6672
8" flg Motive Flow (GPM) 986 1395 1709 1971 2205 2416 2608 2790 2960 3120 3424 3680
Outlet Flow (GPM) (FT) 4928 6976 8544 9792 11040 12096 12384 12448 12640 12800 13088 13344
10" flg Motive Flow (GPM) 1971 2790 3418 3942 4410 4832 5216 5581 5920 6240 6848 7360
Outlet Flow (GPM) 9856 13952 17088 19584 22080 24192 24576 24896 25344 25600 26176 26688

 

Show TableTank eductor dimensional Information (click to show/hide table)
jacoby tarbox tank eductor  
Size Max Free Passage Dimension A Dimension B Dimension C Dimension D
    IN (mm) IN (mm) IPS (mm) IN (mm)
3/8" 0.2656 5.00 (127) 2.50 (64) 3/8 MNPT (10) .50 (12)
3/4" 0.4062 7.25 (184) 3.69 (94) 3/4 MNPT (20) .81 (20)
1-1/2" 0.5625 10.88 (276) 5.50 (140) 1-1/2 FNPT (40) 1.12 (28)
2" 0.8125 14.50 (368) 7.69 (195) 2 FNPT (50) 1.62 (41)
3" 1.1875 22.00 (559) 11.75 (298) 3 FNPT (80) 2.50 (63)
4" consult 25.00 (635) 12.00 (305) 4 FLGD (100) 3.00 (76)
6" consult 35.00 (889) 25.00 (635) 6 FLGD (150) 4.50 (114)
8" consult Contact Us for 8" and Over

 

 

Large Inventory

Jet Pumps are in stock from 1/2" up to 3" sizes.  Jet Pumps are stocked in Carbon Steel, 316SS and Bronze.

Tanks Eductors are stocked in sizes from 3/8" up to 3" in both Carbon Steel and 316SS.   We stock PPL & PVDF materials in sizes from 1/4" thru 1-1/2".

Pressure Ratings

While our competition design their eductors for nominal pressure ratings, NCI Eductors are designed and produced to meet rigorous ASME/ANSI specifications.

Our eductors and jet pumps offer ratings about 30% higher than most competitors.

NCI Eductors are rated at 316SS: 720 psig @ 100 F | Carbon Steel: 740 psig @ 100 F | Bronze: 500 psig @ 100 F