Jensen Series 400 Mixers
Models 450 & 480 · Maximum 75 HP
Jensen Series 400 Mixers are heavy duty, belt driven units designed for long life and trouble-free operation in petroleum service. The Series 400 is supported entirely by the tank manway or nozzle — no tie rods, slings, bases, or external supports required. Light weight and low-overhang design reduce installation costs and simplify maintenance.
Model Specifications
| Parameter | Model 450 | Model 480 |
|---|---|---|
| H.P. (Max) | 20 | 75 |
| Shaft R.P.M. | 425 | 425 |
| Critical Speed | 1,960 RPM | 2,520 RPM |
Standard Materials of Construction
Jensen standard materials offer optimum performance in hydrocarbon applications.
| Component | Material |
|---|---|
| Shaft & Wear Sleeve | 416 Stainless Steel |
| Lock Ring & Lock Bushing | 316 Stainless Steel |
| Drive Yoke | 356-T6 Aluminum |
| Propeller | Cast Steel |
| O-Rings | Viton |
Mechanical Seal — Type "F"
The Jensen Type "F" mechanical seal is an integral part of every Series 400 Mixer and is designed for long life at low cost. Materials of construction were especially selected to suit petroleum applications. Both sealing members are extra heavy to prevent face distortion. If seal replacement is necessary, wearing parts may be purchased separately, cutting replacement cost in half.
Standard Materials
- Rotating Seal FaceCarbon
- Stationary Seal FaceNi-Resist (High Nickel Cast Iron)
Optional Materials
- Manganese Bronze
- Tungsten
- Silicon Carbide
Jensen Sentry System
Available on 450 & 480The Jensen Sentry System consists of an externally-mounted lube pod that connects to the fluid-filled chamber surrounding the mixer's mechanical seal. In the event of a mechanical seal breach, the gravity-lubricated system detects and safely holds maximum tank head pressure — preventing tank contents from leaking onto the ground. Similar to API Plan 65B.
Mixer Selection Guide
Blending — Fixed Angle
A Jensen 400 Fixed Angle Mixer is ideal for blending miscible fluids, preventing stratification, eliminating surface solidification, and heat transfer for uniform temperature. Installed at slight angles relative to the tank centerline — typically 10° in large tanks, 7° in small tanks.
Desired Flow Pattern:
- Slight horizontal swirl
- Significant vertical turnover
Cleaning — Vari-Angle
For sediment removal, select the Jensen Model 400-VA Vari-Angle Mixer. In applications requiring both blending and cleaning, use the Vari-Angle model.
- Directs propeller flow anywhere in the tank
- Eliminates dead spots
- Improves sediment suspension
- Reduces manual tank cleaning
- Removes sediment from old tanks
Mechanical Actuator
The Jensen mechanical actuator automatically sweeps through a 60° entry angle, operating left-to-right and back, completing a full cycle in approximately 28 hours.
Belt Specifications
| Model | Deflection | V-Belt Force | V-Belt Size | Cog Belt Force | Cog Belt Size |
|---|---|---|---|---|---|
| 420 | 3/16" | 3.3–4.8 lbs | 3V450 | N/A | N/A |
| 450 | 1/4" | 5.0–7.5 lbs | 3V710 | 8–10 lbs | 8MGT-1792-21 |
| 480 | 3/8" | 5.0–7.5 lbs | 5VX1000 | 18–20 lbs | 14MGT-2520-37 |
Check pulley alignment and maintain uniform tension. Avoid temperatures above 140°F (60°C). Keep drives ventilated. Never use belt dressing or force belts onto sheaves. Prevent oil contamination.
Propeller Roll-Through Clearances
Manway inside diameter (inches) required to insert propeller. H = manway depth (inches); columns = propeller diameter (inches).
Example: A 29" propeller will rotate through a 23" opening provided the opening depth is 8" or less.
| H (depth) | 20" | 23" | 26" | 29" | 32" | 35" |
|---|---|---|---|---|---|---|
| 4 | 14 | 16 | 17 | 19 | 20 | 22 |
| 5 | 15 | 16 | 18 | 19 | 21 | 22 |
| 6 | 16 | 17 | 19 | 20 | 22 | 24 |
| 7 | 16 | 17 | 19 | 22 | 24 | 25 |
| 8 | 18 | 19 | 20 | 23 | 25 | 26 |
| 9 | 18 | 19 | 20 | 24 | 26 | 28 |
| 10 | 18 | 20 | 22 | 24 | 27 | 29 |
| 11 | 18 | 21 | 22 | 25 | 27 | 30 |
| 12 | 19 | 21 | 22 | 25 | 28 | 30 |
| 13 | 19 | 21 | 22 | 26 | 29 | 32 |
| 14 | 21 | 22 | 24 | 27 | 30 | 34 |
| 15 | 21 | 22 | 25 | 28 | 30 | 34 |
Minimum Fluid Levels & Floor Clearance
Almost every vibration problem with Jensen Mixers results from too little clearance between the tank walls, tank floor, and mixer propeller. Low fluid levels may draw air into the propeller stream and cause vibration.
| Propeller Diameter | Fluid Above Centerline | Prop Tip to Floor |
|---|---|---|
| 35" (889 mm) | 10' (3.1 m) | 12" (305 mm) |
| 32" (813 mm) | 8' (2.4 m) | 12" (305 mm) |
| 29" (737 mm) | 7' (2.1 m) | 12" (305 mm) |
| 26" (660 mm) | 6' (1.9 m) | 10" (254 mm) |
| 23" (584 mm) | 6' (1.9 m) | 8" (203 mm) |
| 20" (508 mm) | 4' (1.3 m) | 8" (203 mm) |
Phoenix Propeller
Standard — All SeriesAfter 15 years of research and consultation with propulsion designers, Jensen combined cutting-edge manufacturing techniques with deep petrochemical application experience to create the perfect balance of performance and efficiency. Each propeller is built to match the customer's performance needs with calculated pitch-to-diameter ratios, dynamically balanced to ISO 1940-G6.3.
Learn more about the Phoenix PropellerLimited Warranty
Jensen Mixers are warranted against defects in materials or workmanship for a period of 12 months following the date of purchase. Warranty is limited to replacement or repair of the agitator by Jensen only. Does not cover consequential damages, removal, freight, or re-installation. Electric motors are warranted separately by their respective manufacturers.
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Standard Features
- Phoenix Propeller
- Type "F" Mechanical Seal
- Tungsten Carbide End Support
- Ferrule Seal
- Tank Shutoff Device
- V-Belt Drive System