The TSURUMI 80B21.5 is a submersible sewage pump from Tsurumi's B series (officially: sewage and wastewater pumps with a channel impeller, also known as B-series non-clog pumps). It has an 80 mm discharge and a 1.5 kW, 2-pole, three-phase, continuous-duty dry-type induction motor. Its grey cast-iron semi-open single-channel impeller is itself shaped like a channel, so solids and fibrous matter are less likely to clog inside the pump. At 50 Hz it delivers up to 16.9 m of head and up to 1,000 L/min, and passes solids up to 49 × 41 mm. At 36 kg dry, it suits sewage pits, sumps, building basements and industrial wastewater tanks.
Selection note: the 80B21.5 is a sewage and wastewater pump, not a slurry pump. The standard unit is grey cast iron with no agitator and no high-chrome wear parts, so it is not suitable for dense sand slurry, settled sludge or desilting. For that duty, choose the KRD611 or KRS-200 slurry pumps. This is the standard (non-automatic) model with no built-in float; for level-controlled start and stop, add a float switch and an external control panel. The standard unit is also not seawater-resistant; seawater-resistant (sacrificial anode) and high-temperature versions are special-order options.
Key features
- Anti-clogging channel impeller: semi-open single-channel impeller that "pumps solids like liquids", minimising trouble caused by clogged solids and fibrous matter.
- Dual inside mechanical seals: silicon carbide (SiC) faces running in an oil chamber, with Tsurumi's original Oil Lifter, which keeps the seal faces lubricated and cooled down to about 1/3 of the normal oil level.
- Built-in circle thermal protector (CTP): directly cuts the motor circuit on overheating or overcurrent.
- Anti-wicking cable entry: stops water creeping along the cable by capillary action if the sheath is damaged or the cable end is submerged, and keeps moist air out of the motor housing to prevent condensation.
- Continuous-duty motor: 2-pole dry-type induction motor, insulation class F, IP68.
- Starting: direct-on-line (D.O.L.). Tsurumi Europe lists the B series as suitable for soft starters and variable-frequency drives (VFD).
- Compact build: 36 kg dry (excluding cable), with a threaded oval-flange discharge; the TOS80B21.5 guide rail fitting is available for fixed installations.
Applications
- Sewage pits and sumps: lifting and discharging sewage and wastewater
- Building basements: sewage and wastewater sumps
- Factories and industrial sites: wastewater tanks and plant effluent
- Sewage treatment facilities: transfer of sewage containing solids and fibrous matter
Performance
The 16.9 m maximum head is the head at near-zero flow, and the 1,000 L/min (about 60 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 pipe friction loss) rises. Select the pump from the 50 Hz performance curve using your system's total head. For more flow, consider the 100B42.2 (100 mm, 2.2 kW, 16 m, 1,500 L/min); for smaller duties, the 50B2.75H (50 mm, 0.75 kW, 15.2 m, 360 L/min).
Technical specifications
TSURUMI 80B21.5 technical specifications (50 Hz)
| Item | Specification |
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| General |
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| Model | 80B21.5 (guide rail version: TOS80B21.5) |
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| Series | B series (non-clog sewage and wastewater pump, channel impeller) |
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| Discharge bore | 80 mm |
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| Discharge connection | Threaded oval flange (guide rail version: threaded JIS 10K flange) |
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| Hydraulic performance |
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| Max. head (at zero flow) | 16.9 m |
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| Max. capacity (curve end point) | 1,000 L/min (60 m³/h) |
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| Max. solids passage | 49 × 41 mm |
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| Electrical |
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| Motor output | 1.5 kW |
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| Motor | Continuous-duty dry-type induction motor, 2-pole, IP68, insulation class F |
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| Synchronous speed | 3,000 min⁻¹ (50 Hz) |
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| Power supply | 3-phase 50 Hz (voltage as per nameplate) |
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| Starting method | Direct-on-line (D.O.L.) |
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| Motor protection | Built-in circle thermal protector (CTP) |
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| Cable | 6 m, PVC |
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| Seals and lubrication |
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| Shaft seal | Dual inside mechanical seals, silicon carbide (SiC) faces, with Oil Lifter |
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| Oil seal | Single, nitrile rubber (NBR) |
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| Lubricant | Turbine oil ISO VG32, 900 ml |
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| Bearings | Shielded ball bearings |
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| Materials |
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| Impeller | Semi-open single-channel, grey cast iron |
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| Casing, suction cover | Grey cast iron |
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| Motor frame | Grey cast iron |
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| Shaft | 420 stainless steel |
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| Liquid limits |
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| Liquid | Sewage and wastewater |
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| Liquid temperature | 0–40 °C |
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| pH | 5–9 |
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| Dimensions and weight |
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| Dry weight (excl. cable) | 36 kg (guide rail version 34 kg, excl. duckfoot bend) |
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| Dimensions (L × W × H) | 446 × 250 × 536 mm (TOS80B21.5: 668 × 250 × 586 mm) |
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| Lowest running water level (W1) | 190 mm |
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Sources: Tsurumi B-series catalogue (IA100) and Tsurumi Europe B-series data (50 Hz). Voltage, cable and rated current of the Hong Kong supply version are as per the nameplate and confirmation from the Hong Kong agent.
B series 50–100 mm model comparison
Tsurumi B series 50–100 mm model comparison (50 Hz)
| Model | Discharge | Power | Max. head | Max. capacity | Max. solids |
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| 50B2.4 | 50 mm | 0.4 kW | 9 m | 263 L/min | 35 × 22 mm |
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| 50B2.75 | 50 mm | 0.75 kW | 12 m | 435 L/min | 45 × 20 mm |
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| 50B2.75H | 50 mm | 0.75 kW | 15.2 m | 360 L/min | 20 mm |
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| 80B21.5 (this product) | 80 mm | 1.5 kW | 16.9 m | 1,000 L/min | 49 × 41 mm |
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| 100B42.2 | 100 mm | 2.2 kW | 16 m | 1,500 L/min | 47 × 53 mm |
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Optional accessories
- TOS80B21.5 guide rail fitting: cast iron set with duckfoot bend, guide support (with bolts and nuts), guide hook, 5 m lifting chain (with shackles) and JIS 10K flange. Guide pipes are not supplied. The pump can be raised and lowered along the rails, so maintenance does not require entering the sump.
- Float switches: MC-2 heavy-duty float switch with shock absorber, normally-open or normally-closed selectable, for liquid with suspended solids and scum; or the MT-1 economy teardrop float switch with integrated counterweight and SPDT contact, for emptying or filling control. Connect through an external control panel.
- External control panel: required for three-phase pumps (overload protection, phase and rotation checks).
Safety and installation
- Installation and wiring must be carried out by a registered electrical worker in line with local regulations. Earth the pump correctly and fit overload and earth-leakage protection in the control panel.
- Check the three-phase rotation direction before putting the pump into service.
- After the built-in CTP trips, the motor may restart automatically once it cools. Always isolate the power before inspection or servicing.
- Keep the liquid above the lowest running water level (W1 190 mm) and avoid prolonged dry running.
- For sewage and wastewater at 0–40 °C and pH 5–9 only. Do not pump flammable, explosive or strongly corrosive liquids, or liquids above 40 °C.
- The pump weighs 36 kg dry. Lift it by its handle or a lifting chain, never by the power cable.
- Never submerge the cable end or cut or damage the cable sheath; the anti-wicking cable entry is a safeguard only.
- Do not touch the pump or put hands near the suction while it is energised. In sewage sumps, follow confined-space and toxic gas (such as hydrogen sulphide) precautions; a guide rail fitting allows maintenance without entering the sump.
Wear parts and routine checks
- Main wear parts: impeller, mechanical seals and oil seal.
- Check and replace the oil in the oil chamber regularly (turbine oil ISO VG32, 900 ml) to protect the mechanical seals. If the oil is cloudy or contains water, have the shaft seals inspected promptly.
- Regularly check the impeller for entangled debris or wear, and the cable sheath for damage.
