What is the difference between the eductor and ejectors. During regeneration, water is routed through the regeneration valve with the inlet valve closed. It differs from the more general pump by having the supply and discharge nozzles both using common firefighting hose fittings facing the same direction. Unique systems designs and manufactures process vacuum systems including condensers, steam jet ejectors, liquid ring vacuum pumps and hybrids along with instrumentation, complete automation and auxiliary equipment. Eductors also known as jet pumps ejectors, and venturi pumps are the most efficient way to pump or move many types of liquids and gases in the petrochemical, process, and power industries. Clarence dela vega has been employed at clarkreliance for six years, working specifically with the eductor product line. Aroundthepump proportioning systems description with an ansul aroundthepump proportioning system a small portion of the discharge from the pressure side of the pump serves as a drive motor being recirculated through an eductor to the suction side of the pump.
Jet pumps are an efficient and cost effective way to pump liquids. Adjust pump discharge pressure to provide 200 psi at the eductor. This involves taking a high pressure motive stream and accelerating it through a tapered nozzle to. Evru operates on the venturi principle as its core element. Chubb michaud cwsvi eductors, also called injectors, work on the venturi principle. In some cases, these specialty eductors can pump a suction volume up to 50 times the motive volume. When the surface pump is operated, flow through the eductor entrains and lifts water from the well lifting it. Jet pumps are an efficient and cost effective way to pump. The eductor pump, or ejector, is as old as the greeks, but it is not as well utilised as. Steam jet syphons steam jet syphons are similar to the water jet eductorsread more. Depending on the application, an injector can also take the form of an eductorjet pump, a water eductor or an aspirator. Liquid jet eductors the pumps with no moving parts schutte.
When the surface pump is operated, flow through the eductor. Aspirators are vacuum pumps based on the same operating principle and are used in laboratories to create a partial vacuum and for medical use in suction. Jet pump application sheet northeast controls eductors. Water coming in the inlet of the eductor is directed through a tapered section and out through a small orifice the venturi into a larger chamber thus creating a. Operation of this device without understanding the manual. The tank liquid agitator tla, with no moving parts, can be used in a wide variety of open.
Using jergusonjacobytarbox eductors for pumping gases. Noun one who, or that which, ejects or dispossesses. The alfa laval vortex radial eductor is a highperformance tank mixing eductor. These models can be used for both exhausting and evacuation. Eductors operate on the basic principles of flow dynamics. Common applications include pumping, mixing, blending, agitation, priming, scrubbing and heating. Jet pumps are in stock from 12 up to 3 sizes in carbon steel, 316ss and bronze. From the family of thermocompressors that includes air ejectors. Venturi principle to pump other liquids or slurries.
An ejector operates on similar principles to create a vacuum feed connection for braking systems etc. On a molecular level, you might imagine that some of the air molecules will bounce against the water flow from the nozzle and thus be accelerated towards the output and quickly enough exit the eductor entirely. Fox minieductors with compressed air fox venturi products. Also, it is important to use pipework sizes at least as large as pump discharge to avoid excessive pressure drop.
Hello,could anyone please educate me the differences between eductor and ejector. Eductor back pressure cannot exceed 65% of inlet pressure. It is particularly suited to challenging tank mixing tasks, for example, when you are working with irregular shaped tanks or various fluid shearing requirements, or when the liquids have a high solids content. Other models of eductors are available for specific applications. The eductor is a modified venturi device which creates a suction, drawing foam. In the case of a fire servicetype foam eductor as seen in figure 1 on the previous page, the inlet nozzle of the 95 gpm eductor pictured is slightly less than 12 inch. Because moving fluid is essential to the operation of an eductor, the device may be defined as a jet pump that uses pressurized liquid, supplied by another.
The deepwell eductor, with hose connections attached to the suction and discharge inlets of the motive pump, is lowered into the well casing. The new line of jacoby tarbox eductors offers advanced design features and superior technical capabilities to create the eductor for virtually any application. The principal reason is the poor overall power efficiency, but lack of use creates lack of familiarity. Deep well pumps are presented differently, to suit their mode of use. The alfa laval vortex ps radial eductor is a highperformance tank mixing eductor. Almost any liquid can be used to motivate an eductor to compress gases or pump liquids. The vacuum draws groundwater into the well from where it is piped back to ground level via a return riser pipe and thence through the reservoir tank back to the supply pump for recirculation. Files are available under licenses specified on their description page. Elmridge tll series liquijet eductors use water or other liquids as the motive fluid, and operate on the. Eductors for pumping gases clark reliance document library. Eductors for pumping liquids clark reliance document library. Unique systems can design and manufacture eductors to suit most applications. The ejectors are used to maintain a system vacuum in the upstream example maintaining the vacuum column pressure whereas eductors main objective is to take out the volume of any fluid out of the system by maintaining a system pressure in the upstream.
This file is licensed under the creative commons attributionshare alike 3. They transport fluids with relatively small flow rates of up to approximately 10 m3h from narrow deep wells where the water level is up to 40 m below ground level especially in the usa. This page was last edited on 1 february 2017, at 18. At 200 psi nilet pressure, do not exceed psi on the outlet gauge 65% of inlet psi. He started out as an applications engineer, sizing and quoting equipment. It is particularly suited to challenging tank mixing tasks, for example, when you are working with irregular shaped tanks or various fluid shearing requirements, or when the liquids have a. An eductor is a device that uses the venturi principle to introduce foam concentrate into the water stream. We also lead the industry in the duplication of parts and assemblies for rotating equipment such as steam turbines, compressors and more.
Energize pumpmotor assembly and note solution surface movement. Water jet eductors water jet eductors utilize a high pressure fluid to handle a low pressure fluid and discharge the mixture against an intermediate pressure using the venturi principle. The friction between the fluids causes the chamber to be evacuated. They transport fluids with relatively small flow rates of up to approximately 10 m 3 h from narrow deep wells where the water level is up to 40 m below ground level especially in the usa the advantage of this arrangement is that there are no moving. The advantage of this arrangement is that there are no moving components located. Eductorjet pumps are used if the water level on the suction side is too low for the suction lift operation of a normal pump. Water jet eductors have numerous uses in the plant such as lifting. The high velocity of the motive stream in this section of the eductor directs the combined fluids toward the outlet section of the eductor. Eductors work in just about any place where there is a need for a more efficient way to pump liquids and solids. The fluid in the nozzle jet and the entrained liquid are forced through a diffuser where the high throughput velocity creates a turbulent flow. Case history cleaners process ardrox 188 caustic cleaner temp 90c.
For every foot the nozzle is elevated above the eductor you must add. In fact, the friction between the moving fluid and the walls of the eductor will take a small amount of energy out of the fluid. Download our liquid pulling jet pumps brochure pdf. All structured data from the file and property namespaces is available under the creative commons cc0 license. Compressed air is available in almost every industrial setting. Be sure fluid depth is adequate or eductors are oriented so that the discharge. If the eductor is being used to prime a pump or siphon, close the suction valve when the suction liquid reaches the eductor. Chemical is diluted and mixed in the ensuing pipe and exits through the rinse valve. To reduce the total you may choose to use a nozzle that flows the rated flow of the eductor at a lesser pressure like 75 psig or if you are using. Figure 10 shows the location of the eductor in a typical regenerable ion exchange system. Fox liquid eductors are venturi jet pumps that use liquid to create vacuum to mix, blend, or dilute other liquids, dry solids, or gasses into a liquid stream.
They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. Az mixing eductor with venturi throat for industrial fluid. This activates the eductor, which draws chemical through the draw valve. Jetpumpeductorejector applications improvegasproduction inlowpressurefields boostgasdeliverypressure lowerseparatorpressure debottleneckcompressor replacecompressorstage minimiseproductionbackout features nomovingparts,minimal maintenanceandcontrol usesavailableenergy sources,suchashigh pressurewells,and. Consider the following drawing for the locations of p1, p2, and p3. Water coming in the inlet of the eductor is directed through a tapered section and out through a small orifice the venturi into a larger chamber thus creating a low pressure area within the chamber. Fox eductor jet pumps or venturi mixers are very reliable, with no. Open the appropriate pump discharge to flow water through the eductor. When foam operations are complete and foam cell valve is closed. Both should be sized to find the proper unit for the appli cation. Bp is sum of hose friction loss, elevation and nozzle pressure. Open the foam cell valve begin discharging foam concentrate to the eductor. Fox minieductors for use with air or gas as the motive. The flow out the discharge of the eductor will be greater than the pump flow put into it by a.
P1 we refer to this as the supply pressure because this is the water pressure at the inlet of the ejector. The az mixing eductor can provide the required energy to accomplish proper mixing, hydration and dispersion utilizing a conventional centrifugal pump or rotary gear pump. Engine, a condenser in which the vacuum is maintained by a jet pump. Evru is a nonmechanical eductor or jet pump that recovers vent gas by using highpressure motive gas to entrain hydrocarbon vapors from lowpressure sources. Attach the eductor pickup tube to the foam discharge 3. An eductor uses a nozzle to produce a high velocity fluid jet to entrain the liquid surrounding the eductor fluid can be either a gas or a liquid.
The ejectors are used to maintain a system vacuum in the upstream example maintaining the vacuum column pressure whereas eductor s main objective is to take out the volume of any fluid out of the system by maintaining a system pressure in the upstream. Ejectors of this type are used throughout industry for pumping and mixing operations. Typical eductor installation schematics circulation sump sump pump to discharge pressure pipe discharge pipe jet assembly suction tube submersible drive pump extraction well recovery well submersible drive pump extraction well to discharge system pumps of oklahoma 1220 nw 3rd street oklahoma city, ok 73106 405 2352695. The best way to adjust for the specific gravity or temperature effects of the suction fluid is to do the calculation for npsh see page 5 of this manual. Fox liquid jet eductors made in usa fox venturi products. Groundwater engineering provides complete eductor dewatering solutions. Using eductors for non powered tank mixing and pumping webinar. It is designed specifically for challenging tank mixing jobs, for example, involving irregular shaped tanks or liquids with high solids content and is particularly suited to rapid turnover requirements. Jetpumpeductorejector surface jet pump and compact. Tanks eductors are stocked in sizes from 38 up to 3 in both carbon steel and 316ss. That creates a low pressure inside the eductor which will cause air molecules to flow into the eductor via the suction inlet.
Water jet eductors also known as jet pumps, utilize the kinetic energy of one liquid to cause the flow of another. Jrgjt eductor models for liquids pumping gases are. Evacuators, sand blasters, jet pumps, and eductors. Initial priming is required and maintained by a foot valve at the suction inlet of the eductor.
Eductors are used in aircraft fuel systems as transfer pumps. This allows pressure in the suction vessel to push additional fluid into the suction connection of the jet pump. It can therefore be manipulated by a fox minieductor to create vacuum that can be used to pump, sample, or mix other gasses or to evacuate a small volume. It can therefore be manipulated by a fox mini eductor to create vacuum that can be used to pump, sample, or mix other gasses or to evacuate a small volume. The az eductor does not use mechanical shear to achieve uniform hydration and dispersion.
Energize pump motor assembly and note solution surface movement. Eductor jet pumps are used if the water level on the suction side is too low for the suction lift operation of a normal pump. Eductor flow rate what determines eductor flow is the eductors inlet nozzle diameter. The s type eductor pump is useful for evacuating liquid out of a well, container or compartment. An eductor acts like a pump to increase the flow rate you put into it. The eductor is mounted on the discharge of the pump or fire truck, a liquid concentrate reservoir is placed nearby with the 24295 eductors pickup wand placed in it. Ejector condenser steam engine, engine, a condenser in which the vacuum is maintained by a jet pump. Before beginning any maintenance the eductor should be. The eductors are used to remove the air 4 times the volume of the vessel per hour for. Jan 25, 2018 clarence dela vega has been employed at clarkreliance for six years, working specifically with the eductor product line. How to size liquid motive eductors for exhausting gases pressure is. Liquid jet eductors the pumps with no moving parts. As nouns the difference between ejector and eductor is that ejector is one who, or that which. If repositioning of the eductor flow direction is necessary, then deenergize pump motor and disconnect at union before attempting to reposition eductor.
1 176 267 1091 1090 1334 139 835 361 1324 1248 1248 478 1077 347 1191 982 759 837 498 382 1367 473 238 939 1370 831 1207 290 539 571 941 411 453 770 493 863 38 241