TLB, TLBA, TCB type heavy oil pump, LC, LCA type Roots pump, LQB type asphalt pump, CH, CHW type gear pump produced by Liaoning Stellar Pump Co., Ltd. Reason and troubleshooting of the fault phenomenon Possible cause Remedy Turn on No flow or less flow • Exceeds pumping allowable suction height • Inlet line is too long • Inlet line leaks • Infeed motor • Excessive head over pump head • Excessive medium viscosity that exceeds pump fit Range; • Pump impeller wear is too large. • Lowering the pump position; • Shortening the pipe to reduce elbows; • Plugging the leaks; • Changing direction; • Reducing the lift or changing the lift pump; • Warming up the medium to reduce medium viscosity. • Replacement of the new impeller pump stops suddenly • The motor is overloaded • The pump chamber enters the foreign object and the pump is stuck; • Other mechanical problems. • Change the piping design to reduce the system resistance; • Disassemble the pump or the inlet flange to remove the foreign matter; • Check and eliminate; excessive vibration and noise in the piping • The piping diameter is too small; Small; • Cooler is started. • Increase the caliber of the pipe; • Reduce the elbow, increase the angle; • Warm start, if the temperature is not too low, over time can be automatically eliminated. Sudden increase in leakage pressure is not tight or seal damage pressure seal pressure or replace the new seal motor overload heat or burn • Pump overload operation; • outlet valve is not open or open too small. • The pressure and flow of the pump exceed the allowable range; the pump should be changed to install the electrical overload protection device; • The valve is fully opened