The TSURUMI KTZ615-SEA seawater-resistant version is a seawater-resistant specification of the Tsurumi KTZ615 heavy-duty submersible dewatering pump, supplied by Jaco through the Hong Kong distributor. The KTZ series is Tsurumi's flagship line of three-phase, cast-iron dewatering pumps (officially classed as a general construction pump). The KTZ615 has a 150 mm (6-inch) discharge and a 15 kW motor, delivers up to 2,800 L/min with a maximum head of 39.5 m and passes solids up to 20 mm; among the 150 mm KTZ models it is second only to the 22 kW KTZ622 for both flow and head. The KTZ615-SEA suits high-volume drainage involving seawater or brackish water, such as waterfront sites and marine construction.
Seawater-resistant configuration: please confirm the exact seawater-resistant configuration of the KTZ615-SEA (components and materials, minimum continuous water level, and service and replacement intervals) with Jaco before ordering. Performance, electrical and dimensional data on this page are for the KTZ615 base model.
Selection note: for freshwater site drainage only, the standard KTZ615 (non-seawater) is sufficient. For lower flow, consider the KTZ611-SEA seawater-resistant version (11 kW, 2,440 L/min); for higher head at lower flow, consider the 100 mm KTZ411-SEA seawater-resistant version (11 kW, up to 48.5 m). The KTZ615-SEA is a dewatering pump, not a slurry pump, so it is not suitable for settled sludge, dense sand slurry, desilting or dredging. It is a non-automatic model with no float or electrode control.
Key features
- Seawater-resistant specification: the KTZ615 supplied for seawater and brackish-water drainage; confirm the exact configuration with Jaco before ordering.
- 150 mm bore and 15 kW motor: up to 2,800 L/min and 39.5 m maximum head, with 20 mm solids passage, for large excavations and long hose runs.
- 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. 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.
- Dual inside mechanical seals: silicon carbide (SiC) faces sitting in the oil chamber, isolated from abrasion and corrosion. Tsurumi's Oil Lifter keeps the seal faces lubricated and cooled even when the oil drops to about one third of the normal level.
- Seal pressure relief ports and 304 stainless steel labyrinth ring: fitted on KTZ models of 7.5 kW and larger, so the mechanical seals only see the sump's submergence pressure.
- 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
- Waterfront development and coastal sites: excavation and temporary drainage of seawater or brackish water
- Marine construction: dewatering during offshore and coastal works
- High-volume drainage: large pits and basements where a lot of seawater or brackish water must be cleared quickly
This is a dewatering pump for water carrying a small amount of sand and silt (up to 10% dry matter). It is not suitable for slurry, dense sand mixtures, desilting or dredging.
Performance
The 39.5 m maximum head is the head at near-zero flow, and the 2,800 L/min (about 168 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. These figures are for the KTZ615 base model (50 Hz).
Technical specifications
TSURUMI KTZ615-SEA seawater-resistant version technical specifications
| Item | Specification |
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| General |
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| Model | KTZ615-SEA |
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| Base model | KTZ615 |
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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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| Seawater configuration | Jaco seawater-resistant specification; confirm the exact configuration with Jaco before ordering |
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| Hydraulic performance (KTZ615 base model, 50 Hz) |
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| Max. head (at zero flow) | 39.5 m |
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| Max. capacity (curve end point) | 2,800 L/min (168 m³/h) |
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| Max. solids size | 20 mm |
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| Electrical |
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| Motor output | 15 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 2,890 rpm on the European 400 V 50 Hz version |
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| Rated current | 28.3 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.) |
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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, 820 ml |
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| Bearings | Shielded ball bearings |
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| Materials (KTZ615 base model; confirm seawater-resistant build with Jaco) |
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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 | Seawater, brackish water and site drainage carrying a small amount of 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 (KTZ615 base model) |
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| Dry weight (excl. cable) | 147 kg |
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| Dimensions (catalogue A × A1 × B) | 457 × 374 × 954 mm (B = overall height) |
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| Min. continuous water level | Base model W1 is 190 mm; confirm the level for the seawater-resistant build with Jaco |
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Sources: Tsurumi KTZ/KTZE/KTD series catalogue (IB107) and Tsurumi Europe KTZ615 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; the seawater-resistant configuration is as confirmed by Jaco at order.
KTZ seawater-resistant models compared
For freshwater drainage only, choose the standard KTZ615.
What's in the box
- KTZ615-SEA pump with 8 m cable × 1
- Hose coupling × 1
Please confirm the exact supply configuration of the seawater-resistant build with Jaco when ordering.
Optional accessories
- Level control: the pump 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.
- Seawater-resistant servicing: ask Jaco which service parts and replacement intervals apply to the seawater-resistant build.
Safety and installation
- The pump weighs about 147 kg dry (base model). 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 a sufficient water level for continuous running (base model W1 is 190 mm; for the seawater-resistant build, run at the level confirmed by Jaco). Use a strainer and stand the pump on a stable base so it does not sink into silt.
- 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. Wear and corrosion are faster with long running in sandy water, seawater or other corrosive service, and flow drops as parts wear.
- Regularly check the oil condition and level in the oil chamber (turbine oil ISO VG32, 820 ml). If the oil is cloudy or contains water, have the shaft seals inspected promptly.
- Follow Jaco's recommended inspection and service intervals for the seawater-resistant build.
