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Hydraulic Pump for Construction Dewatering
Hydraulically driven pump for excavation dewatering, foundation pit drainage, and construction water removal where electrical equipment in wet conditions is restricted
The Hydraulic Pump for Construction Dewatering is a hydraulically driven submersible pump designed for water removal from excavations, foundation pits, trenches, and construction sumps. The pump operates from an external hydraulic power unit, with no electrical motor or cable in the submerged assembly, which suits construction sites where wet conditions, temporary power arrangements, and confined pit access make electric submersibles difficult to deploy and maintain. The unit delivers up to 300 m³/h at heads up to 45 meters, sufficient to lift water from deep excavations to surface discharge points. The 40 mm solids passage handles water carrying soil, sand, and small aggregate from excavation operations. 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 into narrow pits and trenches, and the hydraulic couplers permit connection to a site power unit or excavator hydraulic circuit. The unit is suited to procurement by general contractors, groundworks specialists, and plant hire companies.
Yes, provided the excavator's hydraulic flow and pressure are matched to the pump's hydraulic motor specification. Excavators typically supply hydraulic flow for attachments, and the pump's motor displacement can be selected to operate within that flow range. Contractors should provide the excavator model, flow in liters per minute, maximum pressure, and relief valve setting at inquiry stage, along with the coupler type used on the machine circuit.
The semi-open impeller passes solids up to 40 mm in diameter, covering soil particles, sand, small stones, and aggregate fragments carried into the pit. For water containing larger objects or heavy fibrous material, a strainer with larger openings or a trash pump should be specified. Contractors should confirm the expected solids profile so the impeller and strainer configuration can be matched to the site conditions.
The required head is the vertical distance from the pit sump water level to the discharge point, plus friction losses in the discharge hose or pipe. For a 25-meter vertical lift with 70 meters of discharge hose, the total head requirement is typically 30 to 35 meters. The pump's maximum head of 45 meters provides margin for friction losses and discharge pressure. Contractors should provide the vertical lift and discharge line length so the required head can be confirmed.
Matching requires three inputs from the power unit: hydraulic flow in liters per minute, maximum pressure in bar, and relief valve setting. The pump's hydraulic motor displacement is selected so that the available flow produces the required impeller speed. Providing these figures along with the required discharge head, flow, and vertical lift allows the supplier to specify the correct motor. If the power unit model is known but the flow figures are not, the supplier can typically match the motor from the model number.
The pump can be operated with a level control valve or float switch on the power unit circuit to start and stop automatically based on water level. However, unattended operation in an excavation pit requires consideration of hose security, access control, and site safety procedures. Contractors should confirm the site arrangements before planning unattended operation, and confirm whether the power unit supports automatic start-stop control.
After each dewatering cycle, flush the pump casing and impeller with clean water to remove soil 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 pit sump to discharge point in meters; discharge line length and diameter; excavator or power unit hydraulic flow in liters per minute and maximum pressure in bar; relief valve setting; coupler type; pit depth and working width; expected solids content of the water; and the number of pits to be served. For contractor fleet procurement, indicate the estimated annual quantity and whether the specification must remain fixed across repeat orders.
