The TSURUMI KTZ611 is a heavy-duty submersible dewatering pump from Tsurumi's KTZ series (officially classed as a general construction pump). It has a 150 mm (6-inch) discharge and an 11 kW 2-pole three-phase motor. KTZ is Tsurumi's flagship dewatering line: a cast iron body with a high-chromium cast iron impeller, built for construction, aggregate and mining work. It handles site water carrying sand and silt (up to 10% dry matter, pH 5–9, solids up to 20 mm).
With a maximum capacity of 2,440 L/min and a maximum head of 32.5 m, the KTZ611 is a high-volume pump, suited to large excavations, basements and wide flooded areas that need a lot of water moved quickly. As an 11 kW model it also has seal pressure relief ports and a 304 stainless steel labyrinth ring, which Tsurumi fits on 7.5 kW and larger models. It is a non-automatic model, operated through a control panel or motor starter.
Selection note: the KTZ411 uses the same 11 kW motor with a 100 mm discharge, giving a higher head (48.5 m) but less flow (1,440 L/min); the KTZ611 is the high-volume option and passes solids up to 20 mm. For more flow or head, consider the KTZ615 (2,800 L/min, 39.5 m) or KTZ622 (4,000 L/min, 55 m). For seawater or brackish water, choose the KTZ611-SEA seawater-resistant version fitted with the Seawater-Resistant Kit. The KTZ611 is a dewatering pump, not a slurry pump, so it is not suitable for settled sludge or dense sand slurry; for that duty, choose a slurry pump with an agitator (Tsurumi KTD series).
Key features
- Top-discharge, side-flow design: keeps the motor cooled even when it is exposed to air, and gives a slim body that fits confined spaces. Keep at least 190 mm of water (W1) for continuous running and do not run it dry for long periods.
- Multi-directional hose coupling: the discharge can be set vertical or inclined, so the hose does not fold or kink.
- High-chromium cast iron semi-open impeller: resists wear from abrasive particles. The shaft is quench-hardened where it contacts particles.
- Dual inside mechanical seals: silicon carbide (SiC) faces sitting in the oil chamber, isolated from abrasion and corrosion. Tsurumi rates SiC at 5× the corrosion, wear and heat resistance of tungsten carbide.
- Seal pressure relief ports and 304 stainless steel labyrinth ring: fitted on 7.5 kW and larger models, so the mechanical seals only see the sump's submergence pressure.
- Tsurumi Oil Lifter: keeps the seal faces lubricated and cooled even when the oil drops to about one third of the normal level.
- Built-in circle thermal protector (CTP): cuts the motor circuit directly on excessive heat or overcurrent.
- Anti-wicking cable entry: stops water creeping into the motor by capillary action if the cable sheath is damaged, with a cable clip to protect against pulling.
Applications
- Construction sites: excavation and basement dewatering, temporary site drainage
- High-volume drainage: large pits, basements and flooded areas where a lot of water must be removed quickly
- Aggregate pits and quarries: pit and sump dewatering (water only, not slurry transfer)
- Mines: general drainage duty
Performance
The 32.5 m maximum head is the head at near-zero flow, and the 2,440 L/min (about 146.4 m³/h) maximum capacity is the end point of the performance curve. The two do not occur together: actual flow falls as total head (static head plus hose friction loss) rises. Select the pump from the performance curve using your site's total head. If your site needs a higher head, consider the KTZ411 (48.5 m).
Technical specifications
TSURUMI KTZ611 technical specifications (50 Hz)
| Item | Specification |
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| General |
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| Model | KTZ611 |
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| Series | KTZ (general construction pump, heavy-duty submersible dewatering) |
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| Operation | Non-automatic |
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| Discharge bore | 150 mm (6 in) |
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| Discharge connection | Hose coupling (vertical or inclined) |
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| Hydraulic performance |
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| Max. head (at zero flow) | 32.5 m |
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| Max. capacity (curve end point) | 2,440 L/min (146.4 m³/h) |
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| Max. solids size | 20 mm |
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| Electrical |
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| Motor output | 11 kW |
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| Motor | Continuous-duty dry-type induction motor, 2-pole, insulation class F, IP68 |
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| Power supply | 3-phase (voltage as per nameplate) |
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| Speed | Synchronous 3,000 min⁻¹ (50 Hz); rated 2,935 rpm on the European 400 V 50 Hz version |
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| Rated current | 22 A (European 400 V 50 Hz version; Hong Kong supply as per nameplate) |
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| Starting method | Direct-on-line (D.O.L.); star-delta available on request |
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| Motor protection | Built-in circle thermal protector (CTP) |
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| Cable |
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| Standard cable length | 8 m |
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| Cable sheath | Chloroprene rubber |
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| Cable entry | Anti-wicking, with cable clip |
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| Seals and lubrication |
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| Shaft seal | Dual inside mechanical seals, silicon carbide (SiC) faces, in oil chamber, with Oil Lifter |
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| Seal protection | Seal pressure relief ports; 304 stainless steel labyrinth ring |
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| Lubricant | Turbine oil ISO VG32, 760 ml |
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| Bearings | Shielded ball bearings |
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| Materials |
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| Impeller | Semi-open, high-chromium cast iron |
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| Suction cover | Ductile cast iron |
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| Casing, frame and motor housing | Gray cast iron |
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| Shaft | 420 stainless steel |
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| Liquid limits |
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| Liquid | Site drainage and muddy water carrying sand and silt |
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| Liquid temperature | 0–40 °C |
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| pH | 5–9 |
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| Max. dry matter | 10% |
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| Max. submersion depth | 50 m |
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| Dimensions and weight |
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| Dry weight (excl. cable) | 133 kg |
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| Dimensions (catalogue A × A1 × B) | 457 × 374 × 884 mm (B = overall height) |
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| Min. water level for continuous running (W1) | 190 mm |
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Sources: Tsurumi KTZ/KTZE/KTD series catalogue (IB107) and Tsurumi Europe KTZ611 data (400 V 50 Hz). Max. head, max. capacity, rated speed, rated current, IP rating, bearings and liquid limits are taken from the European 50 Hz data. Voltage and rated current of the Hong Kong supply version are as per the nameplate.
KTZ series comparison: 150 mm and 11 kW models
Tsurumi KTZ series model comparison (50 Hz)
| Model | Discharge | Power | Max. head | Max. capacity | Max. solids | Dry weight |
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| KTZ67.5 | 150 mm | 7.5 kW | 31 m | 2,030 L/min | 20 mm | 100 kg |
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| KTZ611 (this product) | 150 mm | 11 kW | 32.5 m | 2,440 L/min | 20 mm | 133 kg |
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| KTZ615 | 150 mm | 15 kW | 39.5 m | 2,800 L/min | 20 mm | 147 kg |
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| KTZ622 | 150 mm | 22 kW | 55 m | 4,000 L/min | 12 mm | 296 kg |
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| KTZ411 | 100 mm | 11 kW | 48.5 m | 1,440 L/min | 12 mm | 133 kg |
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What's in the box
- KTZ611 pump with 8 m cable × 1
- Hose coupling × 1
Optional accessories
- Seawater-Resistant Kit: the KTZ611 is on Tsurumi's official list of models that accept the kit. It contains galvanic anodes (with fittings and seal putty), a seawater-resistant special cast iron impeller and 304 stainless steel eye bolts where applicable. The kit-fitted version is listed as the KTZ611-SEA seawater-resistant version.
- Star-delta starting: available on request.
- Level control: the KTZ611 has no built-in automatic level control. For unattended running, pair it with a float switch and a motor starter or control panel with overload protection.
- High-temperature version: for liquids above 40 °C, Tsurumi offers a separate high-temperature build rated up to 80 °C. Please contact us.
Safety and installation
- The pump weighs 133 kg dry. Use a hoist or other lifting equipment, attached to the handle or eye bolt with a chain or rope. Never lift or lower it by the power cable, and protect the cable from pulling or cutting.
- Three-phase supply only. Wiring must be done by a registered electrical worker in line with local regulations, with proper earthing and a motor starter that has overload and phase-failure protection. Check the voltage and current on the nameplate before connecting.
- Check the rotation direction after connection.
- If the built-in thermal protector trips, find the cause of the overheating or overcurrent before restarting. Always isolate and lock out the power before inspection or servicing.
- Keep the water level at or above 190 mm (W1) for continuous running. Use a strainer and do not let the pump sink into silt.
- The standard model is not seawater-resistant; use the seawater-resistant version for seawater or brackish water. Do not pump liquids above 40 °C, outside pH 5–9, or flammable or explosive liquids, and do not use it in explosive atmospheres; the pump is not explosion-proof.
Wear parts and routine checks
- Main wear parts: impeller, suction cover and mechanical seals. With long running in sandy water, the impeller and suction cover gradually wear and flow drops; wear is faster in abrasive or corrosive service.
- Regularly check the oil condition and level in the oil chamber (turbine oil ISO VG32, 760 ml). If the oil is cloudy or contains water, have the shaft seals inspected promptly.
