Hydroman^® 65TJH3-50H4A Tunnel Pump for TBM

Electric Drive for Tunnel Pumping Systems

Electric drive suits tunnels because you avoid on-site exhaust emissions and extra ventilation load, noise is lower, and you can power the unit from existing distribution.

A 3 kW, 4-pole motor at 50 Hz runs at a synchronous 1,500 rpm, and about 1,420–1,470 rpm under load. That is a real advantage for abrasive duty. Wear in slurry pumps rises steeply with impeller tip speed. Many pump engineers use a rule of thumb of roughly the square to the cube of speed. A 4-pole pump running at about half the speed of a 2-pole machine will usually give noticeably longer wet-end life on gritty fluids.

A practical warning about frequency: if your site runs on 60 Hz, speed rises about 20%. By the affinity laws, flow rises about 20%, head about 44% and power demand about 73%, which can overload a motor sized for 50 Hz. Always tell us your supply frequency and voltage up front. Also confirm the starting method (direct-on-line, star-delta or VFD) and motor protection class for wet tunnel conditions. Motors in this environment commonly need at least IP55 protection.

Suitable Pump Configuration for Project Requirements

Pump selection comes down to a few numbers:

• Flow rate (Q) and total dynamic head (H), which together define the duty point
• Fluid density and viscosity, which change the power you need
• Solids size and concentration, which decide whether a centrifugal impeller is appropriate
• Installation space and pipework, because a pump that doesn’t fit or connect cleanly causes trouble from day one

Here is a worked example. Suppose you need 25 m³/h of clean water at 15 m head, and the pump runs at 55% efficiency. Hydraulic power is ρ × g × Q × H, or 1,000 × 9.81 × (25/3,600) × 15 ≈ 1.0 kW. Shaft power is about 1.9 kW. Now run the same duty on bentonite slurry at a density of 1.2 t/m³. The power requirement rises about 20%, to roughly 2.2 kW. A 3 kW motor leaves reasonable margin, but only if the duty point sits inside the real pump curve. This is why we ask for your fluid data, not only your flow rate.

Industrial Construction and Maintenance Considerations

In a tunnel, a pump you can’t reach is a pump that stays broken. When you review the pump with us, ask about access to the wet end for inspection, the wear parts (impeller, casing liner or wear plate, shaft seal) and the seal arrangement. We can confirm which construction and service features apply to your configuration.

TBM Auxiliary Pumping

Around a TBM, the pump can support transfer duties on the back-up system, including water supply and drainage within the machine and trailer area. It is a flexible unit for the many mid-flow tasks that sit beside the main circuit.

Tunnel Slurry Transfer

For TBM slurry pump duties at auxiliary scale, the key question is whether the verified hydraulic design and wetted-part materials match your slurry’s solids content, particle size and abrasiveness. This pump is not intended to replace the main slurry circulation pumps of a large slurry TBM. Those systems typically move far higher flow rates through larger-bore pipes. It suits smaller transfer lines, side circuits, sump clearing and feed duties.

Slurry lines are usually designed to run fast enough to keep solids moving. Typical design velocities for fine-solids slurry lines fall around 2.5–4 m/s. Too slow and solids settle and block the line. Too fast and wear and friction losses climb. A 65 mm pipe at 3 m/s carries about 36 m³/h, which gives you a feel for how this pump size matches pipeline velocity.

Bentonite and Drilling Fluid Transfer

Bentonite is the common support and transport medium in slurry shield tunneling. Typical figures are listed below. Your own project values will vary with ground conditions, so use these as orientation only.

When you consider this Tunnel Boring Machine Pump for bentonite tunneling machine duty, the numbers that matter are density, viscosity, solids concentration and the pressure your system needs. Fresh bentonite mixing and transfer is usually friendlier to a centrifugal pump than high-density return slurry loaded with coarse spoil. Tell us which one you mean, and we’ll tell you honestly whether the 65TJH3-50H4A is the right fit or whether a heavier-duty pump makes more sense.

Underground Construction Water Management

Tunnels collect water from groundwater seepage, face and segment-joint leakage, wash-down and process water. A 3 kW electric pump suits sump pumping, drainage staging along a drive, shaft dewatering support and process-water transfer. For gritty sump water, ask about solids handling. Fine sand wears impellers much faster than clean water does.