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.
Tank Eductor Features:
Optimized flow paths enable tank eductors maintain a high "pick-up ratio" (the ratio of fluid entrained to 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 homogenous tank with relation to pH, temperature, solids or gas dispersion, and distribution of chemicals.
Produces a unique agitation not available with other types of mixers, as the tank eductor can generate a directed flow field within the fluid being mixed including viscous fluids, slurries, and suspensions.
Easily mixes liquids of differing specific gravities and is excellent for scrubbing applications where a lower specific gravity fluid is driven into the higher one.
Flow amplification due to high "pick-up ratio" and hydraulic efficiency permits the use of smaller pumps, which translates to reduced costs of mixing or agitation.
Reduces investment cost because existing transfer pumps can be utilized for more than one purpose.
Standard materials 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.
* Carbon Steel
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).
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 homogenous 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).
Tank shape and size
Tank shape and size influence the placement and number of circulating tank eductors required to assure even agitation of the entire volume of fluid . A spherical tank with a single circulating tank eductor mounted as shown in the illustration makes the best use of the mixing and flow characteristics of the circulating tank eductor . With no corners to impede flu id flow , the fluid circulates evenly and naturally. A single circulating tank eductor will often be sufficient to circulate the entire tank contents. The angular intersection of surfaces in cylindrical , square or rectangular tanks can interrupt fluid flow patterns and cause fluid stagnation in these areas. A single circulating tank eductor, mounted as shown in the illustration , will tend to minimize this effect . However, multiple circulating tank eductors can often produce more efficient mixing when using these tank shapes.
Long, narrow tanks such as tank trucks or railroad cars, normally require multiple circulating tank eductors when the ratio of their length to diameter is greater than 2:1. This applies to horizontal or vertical tanks and for any shape of tank cross section.
Larger tanks of any shape may require multiple circulating tank eductors to maintain agitation in all parts of the tank.
|Size IPS||Pressure Difference, PSI|
|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" Flanged||Motive Flow (GPM)||246||349||427||493||551||604||652||698||740||780||856||920|
|Outlet Flow (GPM)||1,232||1,744||2,136||2,448||2,760||3,024||3,072||3,112||3,160||3,200||3,272||3,336|
|Max. Plume Length (FT)||22||41||60||95||132||164||196||228||260||295||360||424|
|6" Flanged||Motive Flow (GPM)||493||698||854||986||1,102||1,208||1,304||1,395||1,480||1,560||1,712||1,840|
|Outlet Flow (GPM)||2,464||3,488||4,272||4,896||5,520||6,048||6,144||6,224||6,320||6,400||6,544||6,672|
|8" Flanged||Motive Flow (GPM)||986||1,395||1,709||1,971||2,205||2,416||2,608||2,790||2,960||3,120||3,424||3,680|
|Outlet Flow (GPM) (FT)||4,928||6,976||8,544||9,792||11,040||12,096||12,384||12,448||12,640||12,800||13,088||13,344|
|10" Flanged||Motive Flow (GPM)||1,971||2,790||3,418||3,942||4,410||4,832||5,216||5,581||5,920||6,240||6,848||7,360|
|Outlet Flow (GPM)||9,856||13,952||17,088||19,584||22,080||24,192||24,576||24,896||25,344||25,600||26,176||26,688|
|Dimension A||Dimension B||Dimension C||Dimension D|
|Size||Max Free Passage||IN||(mm)||IN||(mm)||IPS||(mm)||IN||(mm)|
|8"||consult||Contact Us for 8" and Over|