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Hydraulic Pump for Tunnel Drainage
Hydraulically driven drainage pump for tunnel sumps, invert drainage, and construction water removal where electrical equipment in wet headings is restricted
The Hydraulic Pump for Tunnel Drainage is a hydraulically driven submersible pump designed for water removal from tunnel sumps, invert drains, and construction headings. The pump operates from an external hydraulic power unit, with no electrical motor or cable in the submerged assembly, which suits tunnel environments where wet conditions, confined access, and restricted electrical installation make electric submersibles difficult to deploy. The unit delivers up to 320 m³/h at heads up to 55 meters, sufficient to lift water from invert sumps to surface discharge points. The 45 mm solids passage handles water carrying drill fines, shotcrete residue, and small rock fragments. The pump body is cast iron with a replaceable wear plate, and the impeller is semi-open cast iron. The compact submerged profile allows lowering through narrow access shafts and into sump openings, and the hydraulic couplers permit connection to a tunnel power unit or locomotive hydraulic circuit.
Yes, provided the locomotive hydraulic flow and pressure are matched to the pump's hydraulic motor specification. Tunnel locomotives often supply hydraulic flow for auxiliary equipment, and the pump's motor displacement can be selected to operate within that flow range. Contractors should provide the locomotive model, flow in liters per minute, maximum pressure, and relief valve setting at inquiry stage, along with the coupler type used on the locomotive circuit.
The required head is the vertical distance from the sump water level to the discharge point, plus friction losses in the discharge hose or pipe. For a 40-meter vertical lift with 100 meters of discharge hose, the total head requirement is typically 45 to 50 meters. The pump's maximum head of 55 meters provides margin for friction losses and discharge pressure. Buyers should provide the vertical lift and discharge line length so the required head can be confirmed.
The semi-open impeller passes solids up to 45 mm in diameter, covering drill fines, shotcrete rebound, small rock fragments, and sand. For water containing larger rock pieces or heavy fibrous material, a strainer with larger openings or a trash pump should be specified. Contractors should confirm the expected solids profile at inquiry stage so the impeller and strainer configuration can be matched to the tunnel conditions.
The pump can be lowered by hydraulic hose or by a winch line attached to the lifting point on the pump body. The compact profile allows passage through sump openings and narrow access shafts. The hydraulic hoses are connected before lowering, and the pump is positioned on the sump floor with the suction inlet clear of sediment. Contractors should confirm the sump opening dimensions and the available lifting arrangement before ordering.
After each dewatering cycle, flush the pump casing and impeller with clean water to remove drill fines and sediment. Inspect the hydraulic couplers and hoses for abrasion or damage. Check the impeller and wear plate condition, and replace worn parts as needed. Verify that the pump rotates freely. For units in standby, run the pump briefly each week to confirm operation and prevent seal sticking.
A complete inquiry should include: required discharge flow in cubic meters per hour; vertical lift from sump to discharge point in meters; discharge line length and diameter; tunnel power unit hydraulic flow in liters per minute and maximum pressure in bar; relief valve setting; coupler type; sump opening dimensions and sump depth; expected solids content of the water; and the number of sumps to be served. For project procurement, indicate the supply schedule across construction phases and whether the specification must remain fixed across repeat orders.
