Eductors for Pumping Liquids
Jet pumps — also known as eductors or Venturi pumps — are highly reliable fluid-handling devices with no moving parts. Ideal for condensate recovery, sump drainage, tank transfer, and liquid pumping in demanding industrial environments.
Understanding Jet Pumps: Advantages and Applications
Jet pumps, also known as eductors and Venturi pumps, are highly reliable fluid-handling devices that leverage principles of fluid dynamics to pump, mix, or transport liquids, gases, and solids. These devices operate without any moving parts, making them exceptionally durable, low-maintenance, and well-suited for demanding industrial environments.
Operating Principle
Jet pumps function based on the Venturi effect. A high-pressure motive fluid enters the eductor and is accelerated through a precisely designed converging nozzle, converting pressure energy into kinetic energy and creating a high-velocity jet. As this jet passes through the throat, it generates a low-pressure zone that draws in (entrains) a secondary fluid from the suction connection. The motive and suction streams mix in the throat and enter a diverging diffuser section, where velocity decreases and kinetic energy is recovered as pressure, enabling the combined stream to discharge at an intermediate pressure level.
Supplies the high-pressure driving fluid. Nozzles are tailored to the fluid type — converging for incompressible liquids, converging-diverging for compressible gases — with smooth internal surfaces to maximize efficiency.
Where the secondary fluid or material is drawn in due to the vacuum created by the high-velocity motive stream.
The outlet where the mixed stream exits at reduced but usable pressure.
Key Advantages
- No moving parts — Resulting in exceptional reliability, negligible wear, and minimal maintenance requirements.
- Simple, compact design — For straightforward installation and long operational life.
- Versatile material options — Including corrosion-resistant constructions suitable for aggressive chemicals or harsh conditions.
- Broad applicability — Across liquid, gas, or multiphase (including solids) handling scenarios.
Typical Applications
Achieving homogeneous blends of fluids or creating uniform slurries with suspended solids.
Transferring liquids between tanks, vessels, or pipelines, especially where conventional pumps face challenges.
Conveying granular materials like sand, gravel, or catalyst particles in a liquid carrier stream.
Producing suction for tank evacuation, degassing, priming, or process venting.
Industry-Specific Uses
| Industry | Common Applications |
|---|---|
| Water & Wastewater Treatment | Chemical dosing, tank mixing, sludge circulation, fluid transfer |
| Oil & Gas | Chemical injection into drilling fluids, produced water handling, blending |
| Mining | Reagent mixing in slurries, solids transport, sump dewatering |
| Food & Beverage | Sanitary blending of ingredients, CIP fluid circulation |
| Chemical Processing | Safe handling and mixing of corrosive, reactive, or hazardous fluids |
Performance Considerations
Performance depends on factors such as motive pressure, suction conditions, discharge head, and fluid properties. For liquid motive applications, typical operating pressures range from 15–200 PSIG, with discharge heads varying by model type. Suction lift can reach up to 27 feet, with minimum NPSH requirements as low as 3 feet.
These devices are available in a range of sizes (typically ½″ to 3″ for standard jet pumps) and materials, including carbon steel, 316 stainless steel, bronze, polypropylene, and PVDF, to suit diverse process requirements.
General Performance Table
Liquid Jet Pump Table — Using Liquid as Operating Medium
| Parameter | Low — SL / LL | Med — ML / LM | High — HL / LH |
|---|---|---|---|
| Operating Medium | Liquid | Liquid | Liquid |
| Operating Medium Pressure Range | 15–200 PSIG | 15–200 PSIG | 15–200 PSIG |
| Nom. Operating Med. Pressure PSIG/ft of Discharge Head | 2.0 PSIG (SP.GR. 1.0) | 1.5 PSIG (SP.GR. 1.0) | 1.0 PSIG (SP.GR. 1.0) |
| Discharge Head Pressure Range | to 50 FT. | 40 to 80 FT. | 80 FT. or more |
| Suction Lift | to 27 FT. | to 27 FT. | to 27 FT. |
| Minimum NPSH | 3 FT. | 3 FT. | 3 FT. |
Specialized Configurations
- Tank mixing eductors (to prevent stratification and sedimentation in storage vessels)
- Firefighting foam eductors (for proportioning foam concentrate into water streams)
- Sand/mud eductors (for cleaning sediment from tanks, pipes, or sumps)
- Steam jet eductors (using steam as the motive fluid for pumping or high-vacuum applications)
- Ejectors (for removing liquids from low points or pits)
Large Inventory
- Jet Pumps in stock ½″–3″ in Carbon Steel, 316SS & Bronze
- Tank Eductors stocked ⅜″–3″ in Carbon Steel & 316SS
- PPL & PVDF Tank Eductors stocked ¼″, ⅜″, ¾″, 1″ & 1½″ MNPT
Related Pages
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