,start

(1) Before starting the pipe centrifugal pump, the pump rotor should be rotated to check if the rotor is flexible.

(2) check whether the motor steering and pump steering consistent;

(3) Open the suction valve of the pump (if equipped with a suction valve), close the pump outlet pipe gate valve and pressure gauge cock, so that the pump filled with liquid, or use this system to exclude the suction pipe and air pump;

(4) Check the degree of tightness of the pump and motor coupling bolts and the safety around the pump so that the pump is ready to start;

(5) Start the motor. After the pump is running normally, open the pressure gauge cock and slowly open the pump outlet gate valve until the pressure gauge pointer points to the desired pressure (press the outlet pressure gauge to control the given lift of the pump).

2, run

(1) The centrifugal pump in the pipeline balances the axial force by the balance mechanism in the pump, the balance liquid flows out from the balance device, the balance liquid is connected to the water inlet section through the balance water pipe, or a short pipe is designed in the balance outdoor, Tube flow to the pump. To ensure the normal operation of the pump, the balance of water pipes must not be blocked.

(2) During start-up and operation, observe the readings of instrument, bearing temperature, leaking water and temperature of filling material, vibration and sound of pump, etc. If any abnormal condition is found, it should be dealt with promptly;

(3) Bearing temperature changes reflect the assembly quality of the pump, the bearing temperature rise shall not exceed 35 ℃ ambient temperature, the maximum bearing temperature shall not exceed 75 ℃;

(4) there is a certain axial movement of the pump rotor in operation, the axial movement should be within the allowable range, the clearance between the two coupling halves of the motor and the pump should be ensured;

(5) The pump should be regularly checked during service impeller, seal ring, guide vane sets, bushings, balance disc and other parts of the wear and tear; wear too large should be promptly replaced.

3, downtime

(1) Shut down the stopcock of the manometer before shutting down, slowly close the outlet gate valve, and then close the suction valve of the pump when the pump is stopped (if the suction valve is installed);

(2) In the case of long-term deactivation, all the drain cocks in the water inlet section, middle section and outlet section of the pump should be removed completely, and the excess water shall be discharged and the pump disassembled, cleaned, oiled and packed for safekeeping.

Pipeline centrifugal pump flow size can be adjusted by the outlet valve.

For the outlet pipe installation of the valve device of the pump, the gate valve closed hours, adding some local resistance in the pipeline, the pipeline characteristic curve steep, the working point along the QH curve of the pump to move up and down. The smaller the gate valve is closed, the greater the increased resistance and the smaller the flow rate becomes. This by closing the gate valve to change the pump operating point, known as throttling or variable valve control.

Off gate valve, pipe local head loss increases, the piping system characteristic curve to move to the left, the pump operating point also moves to the left. Gate valve closed the smaller, the greater the loss of local head, the smaller the flow rate. This shows that the throttle adjustment not only increases the local head loss, but also reduces the amount of water, it is not economical. However, due to its simplicity and ease of use, small pumps and pumps are used more in performance tests.

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