1、 Daily operation and maintenance

1. Clean monitoring

Sealing system inspection: Daily detection of mechanical seal leakage (should be ≤ 5 drops/minute). If there is a sudden increase in leakage, the machine should be stopped to replace the seal (PTFE or silicone rubber material) to avoid medium contamination.

Surface cleaning: Use a fiber free cloth to wipe the pump body and pipelines, remove residual media, and maintain a smooth surface of 316L stainless steel (Ra ≤ 0.8 μ m).

Foreign object prevention and control: Check the suction end filter (aperture ≤ 1/5 of the inlet diameter) to prevent flexible impurities (such as rubber and plastic) from entering the impeller flow channel.

2. Running parameter record

Monitor flow, pressure, and motor current (not exceeding 110% of rated value), and check for blockages or cavitation when there are abnormal fluctuations;

Bearing temperature ≤ 75 ℃, vibration amplitude ≤ 0.06mm (exceeding the limit requires shutdown for maintenance).

2、 Regular in-depth maintenance

1. Cleaning and disinfection

CIP/SIP process: Perform on-site cleaning (CIP) every month, using food grade cleaning agents to circulate and flush the pump chamber and pipelines; Sterilization (SIP) uses high-temperature steam (121 ℃/30min) or chemical disinfectants.

Impeller cleaning: Disassemble the pump casing every quarter to remove attachments (such as protein scale) on the impeller and prevent bacterial growth.

2. Lubrication and component maintenance

Bearing lubrication: Replace food grade grease every 2000 hours (filling 1/3 of the bearing chamber) to prevent oil aging and contamination of the medium;

Seal replacement: Mechanical seals are forced to be replaced every 12-18 months to ensure no risk of leakage.

3. Alignment calibration

Use a dial gauge to check the concentricity between the motor and pump shaft (radial deviation ≤ 0.05mm) to reduce vibration wear.

3、 Key points for shutdown maintenance

1. Drainage and antifreeze: If the pump is not in use for a long time, the liquid inside the pump should be drained completely. In winter, the pipeline should be blown with compressed air to prevent freezing and cracking;

2. Rust prevention treatment: Spray food grade rust inhibitor on the surface of stainless steel, and apply lubricating grease to the shaft sleeve to isolate moisture;

3. Regular turning: If the suspension exceeds 72 hours, manually turn the coupling 3-5 times to prevent bearing jamming.

4、 Health compliance management

1. Material verification: Annual inspection of the integrity of the passivation layer on the surface of 316L stainless steel (blue dot test);

2. Document traceability: Complete records of maintenance time, disinfection parameters, and spare parts batches to meet GMP audit requirements.