Daily Inspection & Maintenance Checklist（(For operators to follow directly)）
1. Pre-start Inspection (Must do every time)
- Ensure no large stones, branches or debris in the feeding tank; clean the grille if blocked.
- Check suction pipeline for air leakage, pipe collapse and flange leakage.
- No dry running start: Fill the pump with water first; start only when the pump cavity is fully filled with medium.
- Start at low speed via frequency converter; avoid full-load direct start.
- Confirm inlet and outlet valves are fully open with no pipeline blockage.
2. Running Inspection (Once every 2 hours)
- Listen for abnormal noise, impact sound or dry friction sound; reduce speed or stop immediately if abnormal.
- Monitor current and pressure: keep stable without sharp fluctuation.
- Check pump temperature and vibration; overheating or obvious shaking indicates eccentric wear.
- Observe discharge flow: sudden flow drop usually means sand blockage or stator partial wear.
- Check shaft seal / packing seal for heavy leakage; adjust gland properly if leaking.
- Do not run long-term under low flow & back pressure — it accelerates stator and rotor wear severely.
3. Standard Shutdown Procedure (Daily routine)
- Stop feeding first, do not shut down immediately.
- Inject clean water to flush the pump cavity for 3–5 minutes to wash out internal sediment and avoid hard deposition & seizing.
- Shut down after all sand and sludge are flushed out.
- For long-term shutdown: drain all medium inside the pump to prevent sediment from damaging the stator.
4. Daily Maintenance
- Clean inlet grille and filter; remove stones and impurities.
- Check coupling concentricity; correct offset in time (eccentricity causes fast one-side rotor wear).
- Check reducer lubrication and loose abnormal noise.
5. Weekly Maintenance
- Inspect packing / mechanical seal; refill or replace when worn.
- Tighten all pump and pipeline flange bolts to prevent air ingress.
- Clean sediment in the feeding tank to avoid repeated sand suction.
6. Monthly Inspection (Maintenance staff)
- Dismantle to check stator inner wall for groove, rubber peeling or cracks.
- Inspect rotor surface coating / hardened layer for wear and peeling.
- Check reducer oil level and oil quality; replace oil if deteriorated.
- Verify VFD low-speed parameters; keep speed at 80–180 r/min for sediment sludge.
7. Three Strict Rules (Greatly extend service life)
- No dry running / idling / running without material.
- No high-speed operation for sediment sludge.
- No hard large particles entering the pump directly; pre-filtration is mandatory.
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