Low speed of fire pump
(1) Human factors. Due to the damage of the original electric motor, a considerable part of the users randomly equip the fire pump with another electric motor to drive it. As a result, the flow rate is low, the head is low, or even cannot pump water.
(2) The transmission belt is worn. There are many large-scale fire pumps that use belt transmission. Due to long-term use, the drive belt is worn and loosened and slipping occurs, thereby reducing the speed of the fire pump.
(3) Improper installation. The center distance between the two pulleys is too small or the two shafts are not too parallel, the fire pump drive belt is installed tightly to the top, resulting in too small wrap angle, the calculation of the diameter of the two pulleys is wrong, and the eccentricity of the two shafts of the fire pump with coupling transmission is large, which will cause changes in the speed of the fire pump.

(4) Mechanical failure of the fire pump itself. The impeller and pump shaft fastening nut is loose or the pump shaft is deformed and bent, causing the impeller to move too much, directly rubbing against the pump body, or bearing damage, which may reduce the speed of the fire pump.
(5) Improper maintenance of the fire pump. The motor loses magnetism due to the burning of the windings, changes in the number of turns, wire diameters, and wiring methods of the winding during maintenance, and failure to completely eliminate factors in the fire pump or maintenance will also change the speed of the fire pump.