Submersible Slurry Pump with Agitator
SZBQ submersible slurry pump with a base agitator (mixing wheel) that keeps settled solids in suspension for high-solids dewatering; flow 10–6000 m³/h, head 8–60 m, 3–450 kW, IP68.
Submersible slurry pump with agitator — settled material at the sump floor will not flow to the suction on its own. The agitator returns it to suspension so it is drawn in and discharged instead of consolidating around the intake.
- Mixing wheel for settled sludge and sand; external cutter agitator for compacted deposits
- Solids concentration to 45 % mortar, 60 % pulp by weight
- Particle size up to 80 % of the smallest flow passage
- High-chrome A05 casing and impeller, balanced to limit vibration
- Two mechanical seals in series, tungsten carbide faces, oil-chamber barrier
- Trouble-free seal running exceeds 8,000 hours in normal service
CE · EAC · ISO 9001 · ISO 14001 · ISO 45001
Overview
This configuration of the SZBQ submersible slurry pump carries an agitator at the pump inlet. Settled material at the bottom of a sump does not flow to the suction on its own; without agitation a submersible pump draws mainly liquid and the solids consolidate around the intake. The agitator returns that material to suspension so it can be drawn in and discharged, keeping the intake clear.
Component callouts — submersible slurry pump structure
- Motor stator and rotor
- Isolation oil chamber
- Rubber diaphragm
- Structure
- Flow stabilizing plate
- Guards
- Pump body
- Impeller
- Pump base
Working conditions
| Inlet / outlet diameter | 65–400 mm (flange dimensions to GB/1724.16-2022) |
|---|---|
| Flow range | 30–2000 m³/h |
| Head range | 6–260 m |
| Speed | 720, 990, 1480 and 2960 r/min |
| Motor power | 3–315 kW |
| Temperature range | Maximum liquid temperature ≤ 40 °C |
| Maximum working pressure | Inlet pressure + pumping pressure: 1.0 MPa(G) for Hsp ≤ 75 m, or 1.6 MPa(G) for Hsp > 75 m. Special configuration to 1.6 MPa(G) or 2.5 MPa(G) |
| Medium | Liquids carrying solid particles such as sand, cinder and tailings. Maximum particle diameter 7–60 mm depending on model |
| Structural design | Single-stage single-suction centrifugal pump, vertical mounting |
Model designation
Example: 100-SZ(B)Q 40-30-7.5
| 100 | Outlet diameter in millimetres |
|---|---|
| SZ(B)Q | Submersible slurry pump |
| SZ | Structure |
| (B) | Automatic protection device |
| 40 | Pump design point flow rate, m³/h |
| 30 | Pump design point head, m |
| 7.5 | Motor power, kW |
Agitator Arrangements
- Mixing wheel — mounted at the bottom of the pump, it turns settled sludge into a moving suspension for extraction. The unit combines submerged operation, agitation, sand loosening and sand pumping in one assembly.
- External agitator / cutter — for compacted or hardened deposits, an external agitator with cutting action breaks the material down before it reaches the impeller.
- Mixing blade extension — on SSP/SSPR vertical units a mixing blade is carried on the extension of the impeller suction side, serving the same purpose in settling-pond duty.
Wet End and Hydraulics
Casing and impeller are cast in high-chrome wear-resistant, corrosion-resistant alloy (A05). The impeller and casing are matched on test so that the power curve stays flat and the unit is not easily overloaded when solids loading changes. Impellers are balanced to keep vibration low, which matters in agitator duty where inlet loading is intermittent by nature.
Sealing and Bearings
The motor shaft is sealed by two independent mechanical seals in series with tungsten carbide friction pairs. The first runs in the pumped medium and tightens as medium pressure rises; the second runs in the oil chamber and prevents oil reaching the motor. The oil chamber lubricates and cools both seal faces and carries away bearing heat. Under normal service, trouble-free running of this arrangement exceeds 8,000 hours, and the seal set is designed around a 20 m submergence.
Duty and Medium
The pump handles media carrying solid particles such as mineral powder, ash, iron oxide, coal slime, sediment and gravel. Solids concentration by weight reaches 45 % for mortar and 60 % for pulp. Particle size must not exceed 80 % of the smallest flow-passage dimension of the selected pump. For medium above the standard temperature range, specify in advance so that the unit can be built accordingly.
Typical Applications
- Settling ponds and thickener underflow where solids consolidate at the floor.
- Mine drainage sumps carrying sand and rock fines.
- River, lake and harbour desilting, and sand extraction.
- Ash and slag handling in power generation.
- Municipal sediment removal and industrial sludge transfer.
Selection
Tell us the material at the sump floor, how consolidated it is, the particle size distribution and the solids concentration you need to move, together with flow, head, voltage and frequency. We will confirm whether a mixing wheel or an external cutter agitator suits the duty and issue the selection with the quotation.
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| Series | SZQ / SZBQ intelligent submersible slurry pump |
|---|---|
| Discharge size | 80–500 mm |
| Wet-end material | High-chrome alloy (A05) |
| Power supply | 380 V three-phase 50 Hz standard; 380–600 V and 50/60 Hz available to order |
| Medium temperature | Standard duty up to 60 °C; higher temperatures require prior specification |
| Medium pH | 4–10 subject to material selection |
| Medium density | Up to 1300 kg/m³ |
| Solids concentration | Mortar to 45 % by weight; pulp to 60 % by weight |
| Maximum solid size | Not more than 80 % of the smallest flow-passage dimension of the selected pump |
| Submergence | Designed for operation to 20 m |
| Motor enclosure | IP68 submersible motor, class F insulation |
| Shaft sealing | Two independent mechanical seals in series, tungsten carbide faces, oil-chamber barrier |
Why fit an agitator at all?
Liquid takes the easiest path. Without agitation the pump draws water and leaves solids to build up around the intake until the suction is starved. The agitator re-suspends that material so it is carried through the pump instead of accumulating.
Mixing wheel or external cutter agitator?
A mixing wheel suits settled sludge and sand. An external agitator with cutting action suits compacted or hardened deposits. Describe the deposit and we will confirm which arrangement to use.
What solids concentration can be handled?
Up to 45 % by weight for mortar and 60 % for pulp, with particle size not exceeding 80 % of the smallest flow passage in the selected pump.
Does the agitator increase wear?
The wet end including the agitator is cast in high-chrome alloy for abrasive service. Wear parts are replaceable, and the sealing arrangement is unchanged from the standard unit.
Manufacturer-direct supply · Technical pump-selection support · Export documentation on request.
