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The fire pump is an important component of the fire protection system; it functions like a human heart, playing a crucial role in delivering water for firefighting. If the speed of the fire pump is too low, there may be very little water output or no water at all, resulting in the failure of the fire protection system. Therefore, when the fire pump operates at too low a speed, it is necessary to analyze the reasons promptly and eliminate the fault. Shanghai Liangong Pump Industry will analyze for you the possible reasons for low rotation speeds of several fire pumps. I. Improper installation. A too small center distance between the two pulleys, or axes that are not parallel enough, result in the tight side of the belt being installed on top, which leads to a too small wrap angle. Errors in calculating the diameters of the pulleys, as well as a large eccentricity between the axes of a fire pump driven by a coupling, can all cause changes in the speed of the fire pump. II. Mechanical failures of the fire pump itself. Loose fastening nuts on the impeller and pump shaft, or deformation and bending of the pump shaft, can cause the impeller to shift significantly and come into direct contact with the pump casing; in addition, damaged bearings can also lead to a reduction in the speed of the fire pump. III. Wear of the conveyor belt. Many large fire pumps use belt drives; over time, the belts wear out and become loose, resulting in slippage and thus a decrease in the pump’s rotation speed. IV. Repair of power engines is not recorded. The motor loses its magnetism due to burned-out windings, and changes in the number of windings turns, wire diameter, or wiring method during maintenance, as well as factors resulting from incomplete elimination of faults during repair, can also cause a change in the speed of the fire pump. V. Human factors. A considerable number of users, due to the damage of the original motor, arbitrarily install another motor to drive the pump, which results in low flow rates, low head pressure, or even an inability to draw water. After understanding the various reasons for the low rotation speed of fire pumps, it is possible to take appropriate actions based on those causes, ensuring that the fire pumps remain in proper working condition at all times. Article source: www.liangongpv.com