Danfoss Oil pump BFP41L3 071N7174

The Danfoss BFP41L3 oil pump, SKU 071N7174, is a gear pump designed for domestic burners with a flow rate up to 42 l/h. It operates within a viscosity range of 1.8-12.0 cst (mm2/s) and a pressure range of 7000-20000 mbar. The pump features a filter area of 11 cm2 with a cross-section of 200 microns, and a maximum pressure in the suction/return line of 2 bar. It has a shaft rotation speed of 2400-3450 min, a maximum starting torque of 0.1 Nm, and is rated IP40 for protection. The pump is suitable for fuel temperatures from 0 to 70 °C and ambient/transport temperatures from -20 to 70 °C, with a shaft made of EN225 material.

When selecting a replacement oil pump of this type, ensure the pump's flow rate, pressure range, and shaft dimensions match the burner's requirements. Verify the shaft type and standard (e.g., EN225) to ensure compatibility with the coupling. Check the inlet pressure maximum (2000 mbar) and the viscosity range of the fuel to confirm the pump can handle the system's conditions. Mounting must align with the burner's flange and rotation direction, and the electrical connections (if any) should match the control system.

Common failures in oil pumps of this kind include loss of pressure due to worn gears or a clogged filter, leading to burner ignition failure or unstable flame. Leaks may occur at the shaft seal, causing oil to drip and potentially affecting the motor. If the pump seizes, the motor may overheat or trip. Check the filter for debris, inspect the shaft for wear, and verify the pressure settings against the burner's specifications.