Reference image. Final construction follows the confirmed model and quotation.
Mud & Slurry Pumps
DFBD21.5 Agitator Submersible Drainage Pump - 50 mm Outlet
Model: DFBD21.5
DFBD21.5 agitator submersible drainage pump with 1.5 kW motor and 50 mm discharge. Catalog duty: 15 m³/h at 15 m; catalog maximum reference values reach 30 m³/h and 20 m.
TECHNICAL DATA
Specifications, performance and construction
Confirm the final operating point, materials, motor and connection standard before ordering.
DFBD21.5 product overview
Heavy-duty cast-iron agitator submersible pump designed to stir and transfer bentonite slurry, sediment and muddy water in civil and foundation works.
This page is matched to the official DFIN DFBZ / DFBD series catalog. The listed duty values identify the exact 50 mm configuration; final selection must be checked against the required system curve, liquid and installation method.
Model-specific technical parameters
| Model | DFBD21.5 |
|---|---|
| Series | DFBD Agitator Submersible Drainage Pump |
| Discharge outlet | 50 mm |
| Motor power | 1.5 kW |
| Rated current at 400 V | 3.5 A |
| Rated capacity | 15 m³/h |
| Rated head | 15 m |
| Catalog maximum capacity | 30 m³/h |
| Catalog maximum head | 20 m |
| Impeller passage | 10 mm |
| Standard supply | Three-phase 400 V ±10%, 50 Hz; 380 V ±10%, 60 Hz |
| Insulation | Class F |
| Protection | IP68 |
| Cable | 8 m |
| Temperature | Up to 40°C |
| Depth | Up to 25 m |
Construction and engineering advantages
- Bottom agitator assists suspension of settled slurry
- High-chromium-alloy impeller and agitator for abrasive service
- Top-discharge side-flow design supports motor cooling
- Compact body for confined sumps and construction pits
| Motor / pump body | Rigid cast iron |
|---|---|
| Rotor shaft | AISI 420 stainless steel |
| Mechanical seal | SiC-SiC / carbon-SiC configuration according to motor size |
| Bearings | Ball bearings |
| Hydraulic wear components | High-chromium alloy and/or ductile iron according to series |
DFBD construction, dimensions and model table
Open the high-resolution official catalog sheet to check cross-section, materials, installation dimensions, net weight, gross weight and packing size for the complete series.
DFBD performance curves
The catalog includes the applicable 50 Hz and 60 Hz curves. Maximum values are reference limits, not automatically the recommended continuous-duty point.
Download complete DFBZ / DFBD series catalog (PDF) ↓
Typical applications
- Bentonite and drilling slurry transfer
- Foundation and civil construction drainage
- Mine and quarry sediment handling
- Sewage and muddy-water transfer
Selection and ordering guide
- Provide the required flow and total dynamic head, including pipe and fitting losses.
- Describe the liquid, solids size, solids concentration, abrasiveness and temperature.
- Confirm sump depth, installation method, discharge connection and required cable length.
- Confirm voltage, frequency, control cabinet, level-control and intelligent-protection requirements.
- For slurry service, provide particle distribution and settling tendency so the agitator and wear materials can be verified.
Installation and service notes
Keep the pump within the minimum operating-water level shown in the catalog, verify rotation before continuous operation, and never lift the pump by its cable. Inspect the strainer, impeller, inlet plate or agitator, mechanical seals and cable entry at planned service intervals. Isolate power and pressure before maintenance.
SELECTION SUPPORT
Application-based pump selection
Send the liquid, flow, head or pressure, temperature, solids, installation, power supply and destination for a verified recommendation.
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