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1. Before the screw pump starts, the suction and discharge valves should be fully opened.
2. When the pump is started for the first time or the pump that has been sealed for a long time is used again, the input liquid should be injected, and the pump shaft can be rotated several times by means of the auxiliary tool so that the stator is not damaged. The pump cannot start without liquid, and no liquid start can damage the stator.
3, start the motor for a moment, check the direction of rotation of the pump, confirm the direction consistent with the direction marked on the pump casing before starting operation.
4. After starting the pump, observe whether the readings of the pressure gauge and the vacuum gauge meet the requirements. Pay attention to the operating conditions of the sound and vibration of the pump. If any abnormal operation is found, check immediately.
5. During the initial start-up process, the allowable initial leakage of the packing seal (especially Teflon) should be evenly adjusted within 15 minutes of the initial start-up process. About 1/8 turn each time, adjust to the minimum amount of leakage. If the temperature of the stuffing box rises sharply and the leakage decreases sharply, the bolts should be loosened immediately and the above process repeated.
Second, daily maintenance
1, regularly check the pump outlet pressure.
2, regularly check the pump bearing temperature and vibration conditions.
3, check the seal leakage and bolt tightening.
4, sealing pressure should be higher than the pressure of the sealing chamber 0.05 ~ 0.1MPa.
5, pump abnormal sound or overheating, stop the pump inspection.
Third, common faults and its treatment
Screw pump common faults, causes of failure and treatment methods are shown in Table 1.
Table 1 Common Faults, Causes and Treatments of Screw Pumps Symptom Cause Solution Pump not absorbing oil 1. Suction pipeline is blocked or leaking 2. Suction height exceeds allowable suction vacuum height 3. Motor reversal 4. Medium viscosity Large 1. Check the suction line 2. Reduce the suction height 3. Change the motor rotation 4. Vortex the medium heating gauge pointer 1. The suction pipe leaks 2. The safety valve is not adjusted or the working pressure is too high. When the safety valve opens and closes 1. Check the suction line 2. Adjust the safety valve or reduce the working pressure. Flow drop 1. Clogged or leaking suction line 2. Serious wear in the screw and bushing 3. Insufficient motor speed 4. Safety valve The spring is too loose or the valve seat is not in strict contact with the valve seat. 1. Inspect the suction line 2. Replace the component if it wears out badly. 3. Repair or replace the motor 4. Adjust the spring and sharply increase the power of the grinding disc and seat shaft. Blocked pipe 2. Severe friction between the screw and bushing 3. Medium viscosity is too high 1. Stop the pump to clean the pipe 2. Check or replace the relevant parts 3. Temperature rise of the medium pump 1. Large difference between the pump and the motor 2. Screw Concentric with the bushing or large clearance, eccentric wear 3. Gas in the pump 4. Installation height , Cavitation produced in the pump 1. Adjust concentricity 2. Overhaul 3. Inspect the inhalation pipe to remove the leak part 4. Decrease the installation height or reduce the speed of rotation Pump heat 1. Severe friction in the pump 2. Mechanical seal oil return hole Blocked oil temperature is too high 1. Check adjustment of the screw and bushing gap 2. Unclog the oil return hole to properly reduce the oil temperature Mechanical seal Large amount of oil leakage 1. Wrong seating position 2. Seal gland not flat 3. Ring or static ring seal Face bruises 4. Damage to the moving or static ring seal 1. Re-installation as required 2. Adjust the seal gland 3. Grind the sealing surface or replace the new part 4. Replace the seal
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Daily operation and maintenance of the screw pump
First, the precautions when starting