Precautions for single-unit trial operation of centrifugal pumps
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A centrifugal pump is considered qualified if it meets the following requirements: a) The pump operates smoothly without any abnormal noises; the seal oil, cooling water, and lubricating oil systems function properly, and there are no leaks in the associated pipelines. b) The temperature rise of the rolling bearing ≯70°C. c) Bearing vibration: 1500 revolutions per minute ≯ 0.09 mm; 3000 revolutions per minute ≯ 0.06 mm. d) The motor current must not exceed the rated value. e) The flow pressure remains stable and meets the requirements specified on the nameplate or satisfies the production needs. f) The seal leakage shall not exceed the following limits: ① Mechanical seal: Light oil: 10 drops per minute; Heavy oil: 5 drops per minute. ② Packing seal: Light oil: 20 drops per minute; Heavy oil: 10 drops per minute. g) When transported by water, the flow rate must not exceed 50% of the designed flow rate to ensure that the motor is not overloaded. This post was last edited by yangguogege on 2009-3-25 10:20.]
The title of the post is: Precautions for individual testing of centrifugal pumps, but the content should focus on the requirements that the pump must meet during such testing. According to the requirements of the question, the following should be added: 1. The accompanying motor has been properly installed, and its performance during trial operation meets the standards ； ⒉Installed in place, the site has been cleaned up ； ⒊The commissioning cycle procedure has been established, along with the requirements for water level load testing during commissioning ； ⒋Representatives from the user unit, construction unit, supervision unit, and design unit were present at the site, and this is documented ； ⒌Conduct a trial run in accordance with the operating procedures.
Thank you to the original poster for uploading and explaining! !
It should also be confirmed whether the system in which the pump is located can operate in single-phase water mode
1) Before starting the pump, check the arrow on the pump casing to confirm that the pump is rotating in the correct direction. 2) Check whether each lubrication point of the pump is supplied with sufficient lubricating oil or grease, and whether the valves and check valves are in working condition. 3) Check whether the cooling water and seal oil of the pump are in good condition. 4) After the pump starts, immediately check whether there is pressure on the outlet pressure gauge; if no pressure is present, stop the pump right away and investigate the cause. 4) The pump can only be taken out of trial operation after running under load for 8 hours without any problems. 6) Before the pump operates under load, the motor should be run alone for 4 hours to confirm its rotation direction. 7) The operation of the pump under load shall meet the following requirements: (1) The temperature of the sliding bearings shall not exceed 65°C, and the temperature of the rolling bearings shall not exceed 70°C. (2) The electric speed is 3000 revolutions per minute, with bearing vibration not exceeding 0.06 mm. (3) It operates smoothly without any noise; the oil sealing, cooling water, and lubricating oil systems are functioning properly, and there are no leaks in the auxiliary pipelines. (4) The current does not exceed the rated value. (5) The flow rate and pressure are stable, reaching the outlet pressure specified on the nameplate, thus meeting the production requirements. (6) The seal leakage shall not exceed the following limits: A. For mechanical seals, 10 drops per minute for light oil, and 5 drops per minute for heavy oil. B. Record as required: motor current, outlet pressure, temperatures of various components, vibration, leakage, etc. C. After passing the trial run, carry out acceptance and handover in accordance with regulations.