The TSURUMI 80NHC22.2 is a submersible cutter sewage pump from Tsurumi's NHC series (TSURUMI UNIVERSE brand, officially a non-clogging cutter-type sewage pump). It has an 80 mm discharge and a 2.2 kW 2-pole three-phase dry-type induction motor running at about 3,000 min⁻¹ at 50 Hz. Two sintered tungsten carbide alloy edges are brazed onto the impeller vanes and rotate against the serrated suction cover, cutting rags and fibrous material as they enter so they pass through without clogging the pump, discharge pipe or valves. The pump is designed for raw sewage, wastewater and heavy-duty industrial duty where oversize material would otherwise cause blockages.
Selection note: the 80NHC22.2 and the 50NHC22.2 share the same 2.2 kW motor but differ in discharge size and duty. The 80NHC22.2 reaches more flow at the end of its curve (approx. 0.67 m³/min vs approx. 0.55 m³/min), while the 50NHC22.2 has a slightly higher shut-off head (approx. 23.5 m vs approx. 22 m). More power does not always mean more head: the 80NHC23.0 (3.0 kW) is a low-head, high-flow model with a shut-off head of only about 16.7 m but up to about 1.25 m³/min. For higher head, consider the 80NHC23.7 (approx. 28 m). The NHC is a sewage cutter pump, not a slurry pump, and is not suitable for sand, abrasive slurry or construction-site mud.
Key features
- Cutter impeller: semi-open two-channel impeller with two sintered tungsten carbide alloy edges brazed onto the vanes, working against a serrated suction cover to shred fibrous material and prevent clogging in discharge pipes and valves.
- 80 mm discharge: more flow than the 50 mm 50NHC22.2 at the same 2.2 kW, for pits that need higher volume.
- Double inside mechanical seals: silicon carbide (SiC) faces running in an oil chamber. Tsurumi states that SiC offers five times the corrosion, wear and heat resistance of tungsten carbide.
- Oil Lifter (Tsurumi original design): keeps the seal faces lubricated and cooled even when the oil level drops to about one third of normal.
- Built-in circle thermal protector (CTP): cuts the motor circuit directly on overheating or overcurrent.
- Class H insulated motor: continuous-duty dry-type induction motor, direct-on-line (D.O.L.) starting.
- Anti-wicking cable entry: limits water creeping along the cable cores into the motor.
- Guide rail fitting available (TOS80NHC22.2): lets the pump be raised and lowered for maintenance without anyone entering the sump.
Applications
- Septic tanks and purifying tanks (Johkasou): raw water transfer
- Wastewater treatment facilities: sewage and wastewater transfer
- Pumping stations: lifting sewage that contains fibrous material
- Flood prevention equipment
- Reservoirs at recreational facilities
- Sewage and wastewater drainage: sumps prone to blockage from rags and fibres
Performance
From Tsurumi's 50 Hz performance curve, the 80NHC22.2 has a shut-off head (maximum head, at near-zero flow) of about 22 m. The curve ends at about 0.67 m³/min (about 670 L/min, or 40 m³/h) at a head of about 8.8 m. The two do not occur together: actual flow falls as total head (static head plus pipe friction loss) rises, so select the pump from the curve using your site's total head. These figures are approximate curve readings, not guaranteed duty points. Tsurumi advises against continuous operation on the dashed (low-flow) part of the curve.
Technical specifications
TSURUMI 80NHC22.2 technical specifications (50 Hz)
| Item | Specification |
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| General |
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| Model | 80NHC22.2 |
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| Series | NHC (non-clogging cutter-type sewage pump, 2-pole cutter impeller) |
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| Discharge bore | 80 mm |
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| Discharge connection | Threaded JIS 10kg/cm² flange |
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| Guide rail model | TOS80NHC22.2 (sold separately) |
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| Hydraulic performance (approx. curve readings) |
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| Max. head (at zero flow) | approx. 22 m |
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| Max. capacity (curve end point) | approx. 0.67 m³/min (at approx. 8.8 m head) |
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| Electrical |
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| Motor output | 2.2 kW |
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| Motor | 2-pole dry-type induction motor, continuous-duty rated, insulation class H |
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| 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, chloroprene rubber |
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| Seals and lubrication |
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| Shaft seal | Double inside mechanical seals, silicon carbide (SiC) faces, in oil chamber, with Oil Lifter |
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| Oil seal | NBR |
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| Lubricant | Turbine oil ISO VG32, 1,160 ml |
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| Materials |
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| Impeller | Grey cast iron with tungsten carbide alloy edges |
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| Suction cover | Ductile cast iron |
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| Casing | Grey cast iron |
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| Motor frame | Grey cast iron |
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| Shaft | 420 stainless steel |
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| Dimensions and weight |
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| Dimensions (L × W × H), free-standing | 517 × 259 × 577 mm |
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| Dimensions (L × W × H), guide rail fitting | 691 × 259 × 604 mm |
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| Dry weight, free-standing (excl. cable) | 55 kg |
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| Dry weight, guide rail fitting (excl. cable and duckfoot bend) | 48 kg |
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Sources: TSURUMI UNIVERSE NH-series submersible sewage pump catalogue (IA143, 50 Hz) and TSURUMI UNIVERSE NHC product data. Tsurumi notes that catalogue specifications may change without notice, so obtain the factory specification sheet before use. Maximum liquid temperature, maximum solids passage, pH range and rated current are not published; voltage and current of the Hong Kong supply version are as per the nameplate.
NHC series comparison
Tsurumi NHC series model comparison (50 Hz, approx. curve readings)
| Model | Discharge | Power | Max. head (zero flow) | Max. capacity (curve end) |
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| 50NHC2.75 | 50 mm | 0.75 kW | approx. 16 m | approx. 0.30 m³/min |
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| 50NHC21.5 | 50 mm | 1.5 kW | approx. 19.5 m | approx. 0.43 m³/min |
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| 50NHC22.2 | 50 mm | 2.2 kW | approx. 23.5 m | approx. 0.55 m³/min |
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| 50NHC23.0 | 50 mm | 3.0 kW | approx. 31.5–32 m | approx. 0.50 m³/min |
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| 50NHC23.7 | 50 mm | 3.7 kW | approx. 31.5–32 m | approx. 0.67 m³/min |
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| 80NHC22.2 (this product) | 80 mm | 2.2 kW | approx. 22 m | approx. 0.67 m³/min |
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| 80NHC23.0 | 80 mm | 3.0 kW | approx. 16.7 m | approx. 1.25 m³/min |
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| 80NHC23.7 | 80 mm | 3.7 kW | approx. 28 m | approx. 1.0 m³/min |
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| 80NHC211 | 80 mm | 11 kW | approx. 49 m | approx. 0.99 m³/min |
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Optional accessories
- Guide rail fitting TOS80NHC22.2: cast-iron guide rail system, ordered as the TOS model. The set includes a duckfoot bend, guide support (with bolts and nuts), guide hook, 5 m lifting chain with shackles and a JIS 10kg/cm² flange. The guide pipe is not supplied and must be sourced locally.
- Discharge flanges and fittings: the pump has a threaded JIS 10kg/cm² flange, so mating flanges and fittings must be JIS 10K.
- Float switches (liquid level sensors): MC-2 heavy-duty float with shock absorber, for liquids with a lot of suspended solids and scum, with selectable NO or NC contact; MT-1 economy teardrop float for scum-laden wastewater, with an SPDT contact usable for filling or emptying.
- Control panel: this model starts direct-on-line and its built-in CTP cuts the motor circuit directly. For automatic level control, use a float switch with a control panel.
- Lubricant: turbine oil ISO VG32, 1,160 ml per oil change.
Safety and installation
The first two points come from the Tsurumi catalogue; the rest are general installation guidance:
- Do not run the pump continuously on the dashed (low-flow) part of the performance curve.
- The Oil Lifter only keeps the seals lubricated down to about one third of the normal oil level, so the oil level must still be checked regularly.
- Three-phase electrical connection must be made by a registered electrical worker, with proper earthing and overload and short-circuit protection.
- Check rotation before first use. If the pump runs the wrong way, have an electrician swap two phases.
- Lift the pump by its handle or lifting chain. Never lift it by the power cable.
- Isolate and lock out the power before inspecting or clearing the suction cover. The tungsten carbide edges and serrated suction cover are sharp.
- No explosion-proof rating is published. Do not use the pump in flammable or explosive atmospheres.
- Sewage pits are confined spaces with hydrogen sulphide and oxygen-deficiency hazards. With the guide rail fitting, the pump can be lifted out for service without anyone entering the pit.
- Liquid temperature, pH and solids size limits are not published. If the liquid contains chemicals or seawater, or is hot, confirm suitability with the supplier first.
Wear parts and routine checks
- The tungsten carbide edges, serrated suction cover and mechanical seals wear in service. If cutting performance drops, flow falls or blockages become frequent, have the impeller and suction cover inspected.
- Check the oil level and condition in the oil chamber regularly (turbine oil ISO VG32, 1,160 ml). If the oil is cloudy or contains water, have the shaft seals inspected promptly.
