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How to deal with the fire pump failure

 Fire pump

1.No liquid supply, inadequate supply of liquid or insufficient pressure :

 1).There is no water injection or the appropriate exhaust 
 The elimination of measures: check the pump shell and the pipelines are all filled with liquid entrance. 
 2).Speed is too low 
 Elimination measures: check whether the motor wiring is correct, the voltage is normal or the turbine's steam pressure is normal. 
 3.System head is too high 
 Elimination measures: check the head of the system (especially friction loss). 
 4). The absorption process is too high. 
 Elimination of measures: check the existing net pressure head (inlet pipeline is too small or too long will cause a lot of friction loss). 
 5).Impeller or pipe by blocking 
 Elimination measures: check for obstacles. 
 6).Rotation direction is wrong 
 Elimination measures: check the direction of rotation. 
 7).Production of air or inlet pipeline leakage 
 The elimination of measures: check the entrance pipeline without cavitation and / or air leakage. 
 8).Packing or seal wear, so that the air leakage into the pump casing 
 Elimination measures: check the packing or seal and replace it as needed to check whether the lubrication is normal. 
 9).Pumping hot or volatile liquid when the suction head is insufficient 
 Elimination measures: increase the suction head, to the manufacturers advisory. 
 10).At the end of the valve is too small. 
 The elimination of measures: at the end of the valve installed in the correct size. 
 11).At the end of the valve entrance pipe or the immersion depth is not enough 
 Elimination measures: to the manufacturers to consult the correct depth of immersion. Using baffle to eliminate eddy current. 
12). Clearance between the impeller  
 Elimination measures: check the gap is correct. 
13). Impeller damage 
 Elimination measures: check the impeller, according to the requirements of the replacement. 
 14).Diameter of the impeller is too small
 Elimination measures: to the manufacturers to consult the correct impeller diameter. 
 15) the position of the pressure gauge is not correct 
 Elimination measures: check the location is correct, check the outlet pipe mouth or pipe. 

 2.The fire pump running for a while then stop :

 1).The absorption process is too high. 
 Elimination of measures: check the existing net pressure head (inlet pipeline is too small or too long will cause a lot of friction loss). 
 2).Impeller or pipe by blocking 
 Elimination measures: check for obstacles. 
 3).Production of air or inlet pipeline leakage 
 The elimination of measures: check the entrance pipeline without cavitation and / or air leakage. 
 4).Packing or seal wear, so that the air leakage into the pump casing 
 Elimination measures: check packing or seal and replace as needed. Check if the lubrication is normal. 
 5). Pumping hot or volatile liquid when the suction head is insufficient 
 Elimination measures: increase the suction head, to the manufacturers advisory. 
 6). At the end of the valve entrance pipe or the immersion depth is not enough 
 Elimination measures: to the manufacturers to consult the correct depth of immersion, with the baffle to eliminate eddy current. 
 7).Water pump casing seal damage 
 Elimination measures: check the seal gasket and replace it as required. 

 3.The fire pump power consumption is too large :

 1).Rotation direction is wrong 
 Elimination measures: check the direction of rotation. 
 2).Impeller damage  
 Elimination measures: check the impeller, according to the requirements of the replacement. 
 3).By rotating parts 
 Elimination of measures: check the internal wear parts of the gap is normal. 
 4).Axis bending of 
 The elimination of measures: straightening shaft or replaced as required. 
 5). Speed is too high 
 Elimination measures: check the motor winding voltage or transfer to the turbine's steam pressure. 
 6). The head is lower than the rated value. Too much liquid 
 Elimination measures: to the manufacturers advisory. Install throttle valve, cutting impeller. 
 7) fluid is heavier than expected value 
 Elimination measures: check the specific gravity and viscosity. 
 8). The stuffing is not properly packing (packing, not properly inserted into or running, packing too tight) 
 Elimination measures: check the packing, refill stuffing box. 
 9).Bearing lubrication is not correct or bearing wear 
 Elimination measures: check and replace as required. 
 10).The running clearance between the wear ring is not correct. 
 Elimination measures: check the gap is correct. Replace the pump casing and / or impeller wear ring as required. 
 11).Pump casing pipe on the stress is too large 
 Elimination of measures: to eliminate the stress and the factory representative of the advisory. After eliminating the stress, check the condition of the.

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