Self-priming centrifugal pumps should be selected in accordance with the delivery of liquid, and check the required performance, analysis of suction, discharge conditions, is intermittent operation or continuous operation. Self-priming centrifugal pump test run should meet the following requirements: First, the steering of the drive should be the same as the pump steering; second, to identify the pipeline pump and coaxial pump steering; Third, the fixed connection should be no Loose, the lubrication parts of the lubricant filling specifications and quantity should be consistent with the provisions of technical documents; Fourth. Pre-lubrication requirements of the site should be pre-lubricated; Fifth, all indicating instruments, safety devices should be sensitive , Accurate and reliable; Sixth. Coach should be flexible, no abnormalities; Seventh. The high temperature pump should be preheated before the test run, the temperature should rise evenly, the temperature rise per hour should not exceed 50 ℃; Pump The temperature difference between the surface and the process pipe with working medium inlet shall not be more than 40 ℃. 8. Set the connection device to eliminate the influence of temperature rise and set the bypass connection device to provide the cooling water source. Self-priming centrifugal pump operation should pay attention to the following points: First, to prohibit anhydrous operation, do not adjust the suction port to reduce displacement, prohibit the operation of low flow; second, to monitor the operation of the process, completely prevent packing boxes Leakage, replacement of stuffing box with a new packing; Third, to ensure that the mechanical seal has a full flush of water, water-cooled bearings prohibit the use of excessive water flow; Fourth, do not use too much lubricant; Fifth, according to the recommended cycle of inspection. Establish operating records including operating hours, packing adjustments and replacements, adding lubricants and other maintenance measures and times. The self-priming centrifugal pump suction and discharge pressure, flow, input power, lotion and bearing temperature and vibration conditions should be measured regularly recorded.