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Operation and Usage Precautions for Vertical Lineshaft Turbine Pump | Start-up, Operation, Shutdown, and Maintenance Standards
The vertical lineshaft turbine pump is a submerged long-shaft-driven centrifugal pump. Its core structure consists of an upper motor, a middle long transmission shaft, a submerged pump bowl assembly, multi-point line shaft bearings, and mechanical seal components. It is widely used in power plant circulating water systems, chemical process water transfer, municipal stormwater lifting, mine clean water transport, and fire water intake applications. Unlike conventional horizontal pumps and submersible pumps, its structural characteristics—long and slender shaft system, multi-point support, and fully submerged pump bowl operation—result in extremely high requirements for operating precision, process conditions, start-stop procedures, and daily maintenance.
In field operation, insufficient liquid level, misalignment, improper start/stop procedures, lack of lubrication, and overload conditions are the five major high-frequency causes of shaft bending, bearing burnout, mechanical seal leakage, cavitation vibration, and impeller damage. To cover full-scenario and full-process operational standards, this artical details five major modules: start-up inspection, running monitoring, shutdown operation, daily maintenance, and fault prevention. Standardized operating procedures are organized in tables to fully support industrial field operation, equipment management, and operator training requirements.
1. Fine-Grained Pre-Start Inspection (Full Checklist, Strictly Prohibit Starting with Hidden Risks)
Pre-start inspection is a critical step to prevent initial equipment damage and reduce long-term failure rates. A rough inspection approach must be abandoned. Inspection shall be conducted systematically across four dimensions: operating conditions, pump body, piping & valves, and electrical system. The pump may only be started after all items are confirmed normal. The detailed inspection standards are shown in the table below:
| Inspection Dimension | Detailed Items | Qualification Standards and Prohibitions |
| Operating condition & liquid level inspection | Effective submergence depth, water quality condition, debris in sump | Must meet rated submergence depth; impeller and inlet must be fully submerged. Strictly prohibit borderline liquid level or air exposure at inlet. No weeds, plastics, stones, or fibrous debris in the sump to avoid impeller entanglement or inlet blockage. For sediment-laden water, ensure no excessive silt accumulation to prevent abrasive wear during startup |
| Shaft system inspection | Pump shaft, coupling, line shaft bearings, fastening bolts | Long shaft must be free of bending, corrosion, and radial runout. Coupling alignment deviation ≤ 0.1 mm, uniform end clearance, and all bolts tightened without loosening or missing. All line shaft bearings and sleeves must be intact without wear, cracks, or loosening |
| Seal & lubrication inspection | Mechanical seal, bearing grease, seal gland | Mechanical seal must be intact without damage or leakage. Seal gland must be properly tightened. Bearing grease filling should be appropriate (1/2–2/3 chamber volume), free of deterioration, blackening, water ingress, or contamination. Dry running is strictly prohibited |
| Piping & valve inspection | Inlet/outlet pipelines, valves, strainers, instruments | Pipes must be free of deformation, cracks, or looseness; flange seals must not leak. Strainer mesh must be intact and unclogged. Inlet/outlet valves must operate smoothly. Outlet valve must be closed before startup. Pressure gauges, ammeters, and flow meters must be calibrated and accurate |
| Electrical safety inspection | Motor, wiring, grounding, protection devices | Motor insulation resistance must meet standards. Wiring terminals must be tightened without heating or oxidation. Grounding system must be reliable. Overload, phase loss, short circuit, and over-temperature protection systems must all be active. No alarms in control system |
2. Full Process Operation Standards for Start-up and Running (Precise Condition Control and Damage Prevention)
The vertical lineshaft turbine pump shaft system is long and relatively flexible, with lower rigidity compared to conventional centrifugal pumps. Its resistance to impact and overload is relatively weak. Therefore, operational compliance during start-up and running directly determines shaft service life. Standardized start/stop and monitoring rules must be strictly followed.
| Operation Stage | Standard Procedure | Prohibited Actions and Hazards |
| Start-up | 1. Ensure outlet valve is fully closed for no-load start condition; 2. Jog the pump 1–2 times to confirm smooth rotation without jamming or abnormal noise; 3. Start the motor formally and wait until speed stabilizes and pressure normalizes; 4. Slowly and evenly open the outlet valve to rated condition within 30–60 seconds. Rapid full opening is prohibited | Direct loaded start-up is strictly prohibited, as it may cause surge current, motor overload heating, and instantaneous shaft deformation. Rapid valve opening may cause hydraulic shock, pipeline vibration, and impeller overload stress |
| Parameter monitoring | Continuously monitor outlet pressure, flow rate, motor current, and casing temperature. Perform inspections every 30 minutes and record operational data to ensure parameters remain within rated range | Over-flow, over-head, and over-current operation is strictly prohibited. Long-term overload accelerates wear of sleeves and bearings, causes eccentric shaft vibration, and shortens service life |
| Condition inspection | Continuously monitor sound, vibration, and seal leakage conditions. For dirty media, regularly clean strainers to ensure smooth inlet flow | Abnormal noise, excessive vibration, or leakage must not be ignored. Filter clogging may cause suction starvation and cavitation, resulting in impeller honeycomb damage and unstable flow |
| Operation control | Maintain stable operating conditions. Continuous operation is preferred. Adjust valve opening slowly for load regulation | Frequent start/stop operation is strictly prohibited (minimum interval ≥ 10 minutes). Frequent cycling causes shaft fatigue, seal failure, and bolt loosening |
During operation, cavitation and dry-running must be strictly avoided. If liquid level drops, inlet resistance increases, pressure fluctuates, or cavitation crackling noise occurs, the outlet valve must be immediately throttled to reduce load. If necessary, shut down the pump for replenishment. Forced operation under fault conditions is strictly prohibited.
During operation, touching rotating components or removing protective covers is strictly prohibited to prevent mechanical injury accidents.
3. Standard Shutdown Procedures and Shutdown Protection Details
Improper shutdown operation may lead to water hammer impact, reverse rotation of impeller, shaft loosening, and pipeline damage. The principle of “unload first, then shutdown” must be strictly followed.
| Shutdown Scenario | Standard Procedure | Protection Requirements |
| Normal short-term shutdown | 1. Slowly close outlet valve to fully remove hydraulic load; 2. After pipeline pressure stabilizes, cut off motor power; 3. Record shutdown time and operating conditions | Direct power-off shutdown or load-bearing shutdown is strictly prohibited. This prevents water hammer, impeller reverse loosening, and reverse shaft damage |
| Winter low-temperature shutdown | After normal shutdown, open drain ports of pump and pipeline to fully discharge residual water | When ambient temperature is below 0°C, complete drainage is mandatory to prevent freezing expansion that may crack pump casing, seals, and pipelines |
| Long-term shutdown (≥7 days) | Drain water, clean impeller debris, wipe shaft contamination, tighten all loose bolts | Apply anti-rust grease on bearings, couplings, and shafts. Seal inlet and outlet pipes. Perform dust, corrosion, and moisture protection. Manually rotate shaft monthly to prevent seizure and deformation |
In case of sudden power failure or emergency shutdown, there is no need to close valves first; priority is to cut off power supply. Afterwards, inspect the pipeline and pump body for impact damage before restarting.
4. Daily Maintenance Standards and Core Operational Prohibitions
More than 70% of vertical lineshaft turbine pump failures are caused by insufficient maintenance or improper operation. Routine refined maintenance significantly extends equipment service life and stabilizes performance.
| Maintenance Item | Maintenance Cycle | Content |
| Bearing lubrication | Monthly inspection, grease every 3 months, full replacement every 12 months | Check grease condition, replenish or replace in time. Prevent dry running, overheating, seizure, and accelerated wear |
| Seal system inspection | Weekly inspection | Monitor mechanical seal leakage. Minor leakage must be repaired promptly. Prevent seal failure from damaging shaft and sleeve |
| Shaft alignment calibration | Semi-annual calibration or immediate correction upon abnormal vibration | Check shaft alignment and coupling precision to eliminate vibration caused by deviation |
| Pipeline & instrument calibration | Monthly inspection | Tighten pipeline bolts, check flange sealing, calibrate pressure and current instruments |
| Debris cleaning | Weekly; daily in harsh conditions | Remove sump debris and clogged filters to ensure smooth inlet flow and prevent cavitation and entanglement |
Core Operational Prohibitions Summary:
Strictly prohibit low-liquid-level dry running, overload operation beyond rated conditions, frequent short-cycle start/stop, forced operation under faults, removal of protective components during operation, and winter shutdown with water retained in the system.
Once abnormal conditions such as current fluctuation, unstable pressure, excessive vibration, abnormal noise, or leakage are detected, the pump must be shut down immediately for inspection. Small faults must not be allowed to develop into severe damage such as shaft bending, motor burnout, or seal failure.
Conclusion
The operational stability and service life of the vertical lineshaft turbine pump depend entirely on standardized and refined full-process operation and maintenance. Compared with ordinary pumps, its long shaft structure imposes higher requirements on operational detail, process conditions, and maintenance quality.
From full pre-start inspection, precise load control during startup, real-time operational monitoring, standardized shutdown under different scenarios, to periodic maintenance procedures, every step directly affects operational safety and energy efficiency.
Strict adherence to the operational standards and table-based procedures defined in this document can effectively prevent cavitation, vibration, leakage, shaft damage, and other common failures, significantly reduce maintenance costs and failure rates, and ensure long-term efficient, stable, and safe operation, fully meeting the requirements of industrial continuous water transfer applications.
FAQ – for Vertical Turbine Pump
Learn about the key spare parts commonly used in vertical turbine pumps.
| Vertical Turbine Pump Spare Parts & Qty (2 Years) | ||||||||
| For Packing Seal Pump | ||||||||
| Spare Parts/Qty | Pump Qty (Including Spare Pump) | |||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 8 | ≥10 | |
| Shaft Sleeve（Packing） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Shaft Sleeve（Middle） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Shaft Sleeve（Lower） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Packing | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| O Ring | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Wear Ring | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Adapter Coupling | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Guide Bearing | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Bearing | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Impeller Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Middle Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Transmission Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Impeller | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Packing Gland | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| For Mechanical Seal Pump | ||||||||
| Spare Parts/Qty | Pump Qty (Including Spare Pump) | |||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 8 | ≥10 | |
| Shaft Sleeve（Mechanical Seal） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Shaft Sleeve（Middle） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Shaft Sleeve（Lower） | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Mechanical Seal | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| O Ring | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Wear Ring | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Adapter Coupling | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Guide Bearing | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Bearing | 1 | 2 | 3 | 3 | 5 | 5 | 7 | 8 |
| Impeller Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Middle Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Transmission Shaft | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Impeller | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Mechanical Seal Gland | 1 | 1 | 1 | 2 | 2 | 3 | 4 | 5 |
| Under harsh operating conditions, the quantity of spare parts should be doubled. | ||||||||
Discover how to select the right vertical turbine pump materials based on fluid properties and operating conditions.
| Pump Parts | For Clear Water | For Sewage | For Seawater |
| Discharge Elbow / Casing | Carbon Steel | Carbon Steel | S.S / Super Dulex |
| Diffuser / Suction Bell | Cast Iron | Cast Iron / Ductile Iron / Cast Steel / S.S | S.S / Super Dulex |
| Impeller / Impeller Chamber / Wear Ring | Cast Iron / Cast Steel | Ductile Iron / S.S | S.S / Super Dulex |
| Shaft / Shaft Sleeve / Coupling | Steel / S.S | Steel / S.S | S.S / Super Dulex |
| Guide Bearing | PTFE / Thordon | ||
| Remark | Final material depends on the liquid condition or the client’s request. | ||
Follow the essential installation steps to ensure safe and reliable operation of the vertical turbine pump.
| Standardized Installation Procedure for Vertical Turbine Pump | |||
| Work Stage | No. | Main Steps | Key Operations & Notes |
| I. Pre-Installation Preparation | 1 | Site & Foundation Inspection | • Clean the wellhead or pit, ensure no debris. Check foundation (well or concrete pedestal) verticality, levelness, and dimensions meet drawings. • Verify positions and specifications of anchor bolts or embedded parts. |
| 2 | Equipment Unpacking & Inspection | • Count all items according to packing list: motor, pump base, drive shaft, delivery pipe, guide bearing housing, impeller, coupling, etc. • Check all parts for transport damage, especially drive shaft threads, keyways, and flanges of delivery pipe. | |
| 3 | Tools & Material Preparation | • Prepare lifting equipment (hoist, crane), special wrenches, level, dial indicator, plumb line, lubricant (oil/grease), raw tape, lifting beams, etc. • Prepare cleaning agents and cloths. | |
| II. Pump Casing & Shaft Installation | 4 | Install Pump Base & Outlet Elbow | • Lift pump base onto foundation, preliminarily position, insert anchor bolts but do not tighten. • Install outlet elbow and connect outlet piping. |
| 5 | Install First Section of Delivery Pipe & Drive Shaft | • Lift the first delivery pipe section, install guide bearing housing at lower end, slowly lower to pass through pump base and preliminarily connect. • Insert drive shaft from top of delivery pipe, connect lower end via coupling to pump shaft (or next shaft section). Ensure firm keyway connection and install drive shaft protective tube. • Core: maintain verticality and concentricity. Each section must be checked with level or plumb line (typical tolerance ≤2 mm/m). | |
| 6 | Install Delivery Pipe Sections & Drive Shaft | • Install guide bearings in each pipe section (water or grease lubricated) ensuring drive shaft passes through center. • Connect each drive shaft section, ensure keyway/coupling connection is firm and concentric. Check rotation manually for smoothness. | |
| 7 | Install Final Impeller & Suction Bell | • Install final stage impeller, adjust axial clearance via upper drive shaft adjustment nut (refer to manufacturer’s manual). • Install suction bell. | |
| III. Alignment, Grouting & Motor Installation | 8 | Overall Alignment & Primary Grouting | • Use pump base as reference, check overall verticality with level. • Perform primary grouting, fix anchor bolts. Wait until grout fully cures (usually 3–7 days). |
| 9 | Install Motor & Alignment | • Lift motor onto base. • Key alignment: use dial indicator to adjust motor and drive shaft coaxiality (radial deviation ≤0.05 mm) to reduce vibration and wear. Tighten motor anchor bolts after alignment. | |
| 10 | Install Coupling & Guard | • Install coupling and connections, install protective guard. | |
| IV. Piping & Accessories Installation | 11 | Lubrication & Sealing System | • For grease-lubricated guide bearings, inject specified grease via lubrication line. • For water-lubricated guide bearings, connect water pipes and ensure clean water supply. • Connect pump base stuffing box or mechanical seal cooling/flushing water lines. |
| 12 | Electrical & Instrumentation Installation | • Connect motor power cables, install ammeter, temperature sensors, etc. • Install outlet pressure gauge, flow meter. | |
| V. Post-Installation Inspection & Test Run | 13 | Final Checks | • Manual rotation: rotate motor-coupling system, check smoothness, flexibility, and absence of binding. • Check all connection bolts are tightened. • Jog motor: confirm rotation direction (typically clockwise from top view). |
| 14 | Priming & Test Run | • Fill pump with delivery medium (for deep well pump, pre-lubricate via auxiliary pipe and stuffing box). • Start: close outlet valve, start motor. • Commissioning: slowly open outlet valve, monitor current, pressure, flow, vibration, bearing temperature, and check stuffing box leakage (droplet form preferred). Test run ≥2 hours. | |
Explore proper disassembly and maintenance procedures to maximize the vertical turbine pump service life.
| Standardized Disassembly & Maintenance Procedure for Vertical Turbine Pump | |||
| Work Stage | No. | Main Steps | Key Operations & Notes |
| I. Pre-Disassembly Preparation | 1 | Shutdown & Isolation | • Safety first: slowly close the outlet valve, cut off power, and apply lockout/tagout (LOTO). • Close the inlet valve, open pump vent, drain pump and piping. For deep well pumps, lower water level below pump suction. |
| 2 | Disconnect External Connections | • Disconnect motor power cables. • Remove coupling bolts and guard. • Disconnect all connected pipelines (lubrication, cooling, pre-lubrication water pipes) and seal pipe ends. | |
| 3 | Tools & Preparation | • Prepare lifting equipment (tripod, hoist), shaft clamps, special wrenches, marking pens, parts boxes. • Prepare shaft support frame for placing removed long shaft. | |
| II. Pump Casing Disassembly (Top to Bottom) | 4 | Remove Motor & Pump Base Accessories | • Lift motor and place safely. • Remove stuffing box covers or mechanical seal, lubrication pipe fittings, and other accessories. |
| 5 | Remove Drive Shaft Adjustment Mechanism | • Loosen and remove adjustment nuts and shaft end fixing devices. | |
| 6 | Lift Drive Shaft & Delivery Pipe Sections | • Core: lift in sections to prevent bending and dropping. • Use shaft clamp to support top section of drive shaft, lift a short distance to disconnect from next shaft coupling. • Place removed shaft sections horizontally on support; do not lean. • Disconnect top delivery pipe flange from pump base and lift out the section. • Repeat for all shaft and pipe sections. Number each section sequentially. | |
| 7 | Lift Impeller & Suction Components | • Lift final-stage impeller, guide vane assembly, and suction bell. | |
| III. Parts Cleaning, Inspection & Measurement | 8 | Cleaning, Inspection & Measurement | • Thoroughly clean all parts. Key checks: – Drive shaft: straightness, keyway wear, surface corrosion. – Coupling: check keyway, end faces. – Impeller: cavitation, wear, corrosion, dynamic balance if necessary. – Guide bearings (rubber or metal): check inner diameter, replace if worn. – Delivery pipe: flange surfaces, internal corrosion, scaling. – Seals: check stuffing box or mechanical seal wear. |
| IV. Reassembly (Reverse Order) | 9 | Reassembly | • Core principle: clean, align, vertical, tighten section by section. • Replace all damaged O-rings, gaskets, guide bearings. • Start from lowest suction component, reinstall delivery pipes and drive shaft sequentially. Check drive shaft flexibility and delivery pipe verticality. • Install impeller, adjust axial clearance via upper adjustment nut to manufacturer specification. • Reinstall motor and perform precise alignment (same as installation standard). • Install stuffing box or mechanical seal, adjust gland tightness. |
| V. Final Verification | 10 | Final Inspection & Test Run | • Manual rotation: rotate coupling system, check entire long shaft assembly moves freely. • Connect all pipelines, inject grease or start lubrication water. • Follow “Priming & Test Run” procedure from installation, paying attention to vibration and current after start-up. |
Find practical solutions to the most common vertical turbine pump operating issues.
| Common Faults and Solutions for Vertical Turbine Pump | |||
| No. | Problems | Causes | Solutions |
| 1 | Pump cannot start | 1. Power failure (power off, phase missing, voltage too low). 2. Motor failure (stator short circuit, wiring error). 3. Pump shaft jammed, bearing seized, or foreign object inside. 4. Start conditions not met (e.g., deep well pump not pre-lubricated). 5. Packing gland too tight. | 1. Check power, switch, fuses; restore three-phase voltage. 2. Inspect and repair motor, correct wiring. 3. Manually rotate, clean debris, replace seized bearings. 4. Add sufficient pre-lubrication water as per procedure. 5. Loosen packing gland appropriately. |
| 2 | Insufficient flow or no water | 1. Suction filter, impeller, guide vane body, or piping blocked. 2. Insufficient submergence, air suction causing cavitation. 3. Wrong motor rotation. 4. Seal ring (wear ring) worn or impeller damaged. 5. Low speed (voltage/frequency mismatch). 6. Water level drops, suction bell exposed. 7. Discharge pipe broken or leaking. 8. System resistance mismatch. | 1. Clean filter, impeller, guide vane, and piping. 2. Lower installation height, increase water level (>1 m recommended). 3. Swap any two motor phase wires to correct rotation. 4. Replace worn seal ring or impeller. 5. Check voltage/frequency; ensure rated speed. 6. Increase submergence or extend delivery pipe. 7. Inspect and repair discharge pipe and connections. 8. Recalculate system conditions to ensure efficient operation. |
| 3 | Low head / low pressure | 1. Wrong impeller stages or severe wear. 2. Low speed. 3. Cavitation. 4. Seal ring worn, high internal leakage. 5. Excessive pipeline resistance (valves partially closed, too many elbows, small diameter). | 1. Check impeller stages, replace worn impeller. 2. Check voltage/frequency, increase to rated speed. 3. Increase inlet pressure, improve suction conditions, prevent cavitation. 4. Replace worn seal ring. 5. Fully open outlet valves, optimize piping layout and diameter. |
| 4 | Severe vibration, abnormal noise | 1. Insufficient submergence, cavitation (high-frequency popping sound). 2. Impeller unbalanced (scaling, wear, deformation). 3. Drive shaft misalignment, bent or excessive intermediate bearing spacing. 4. Pump-motor shaft misalignment. 5. Bearing (including guide bearing) damaged or excessive clearance. 6. Uneven foundation, loose anchor bolts. 7. Improper support of discharge pipe. 8. Operation near critical speed. | 1. Increase suction water level, ensure proper submergence. 2. Clean impeller, perform dynamic balancing. 3. Correct shaft concentricity; straighten or replace bent shaft; install and tighten intermediate bearing brackets. 4. Use dial indicator to correct coaxiality (≤0.05 mm). 5. Replace damaged bearings and worn guide bearings. 6. Re-level foundation, tighten all anchor bolts. 7. Check and reinforce pipe supports; avoid resonance frequency. 8. Adjust operating speed to avoid critical region. |
| 5 | Motor overload (high current) | 1. Low supply voltage. 2. Bearing damage, impeller rubbing seal ring or casing. 3. Pump suction blocked with sand or debris. 4. Flow too high. 5. Packing gland too tight. 6. Single-phase operation due to supply line fault. | 1. Start when supply voltage normal. 2. Replace bearings; check and adjust impeller axial clearance. 3. Stop pump, clean sand/debris. 4. Adjust outlet valve to limit flow to rated range. 5. Loosen packing gland appropriately. 6. Professional electrician inspect and repair supply. |
| 6 | Bearing overheating (including motor bearings) | 1. Insufficient lubrication or grease aging/deterioration, wrong type. 2. Bearing contaminated by water, lubrication failure. 3. Incorrect bearing clearance (too small or too large). 4. Long shaft misalignment, radial load on bearing. 5. Bearing damage. 6. Speed exceeds bearing limit. | 1. Refill or replace qualified waterproof grease (high speed ~400 h, low speed ~600 h). 2. Replace grease, repair water ingress seal. 3. Adjust bearing clearance per manufacturer. 4. Re-align long shaft system. 5. Replace bearing. 6. Control speed within allowed limit. |
| 7 | Severe shaft seal leakage (mechanical seal) | 1. Seal face wear, scaling. 2. Seal water pressure insufficient or interrupted (0.1–0.3 MPa). 3. Excessive shaft axial movement. 4. Installation deviation. 5. Particles in medium causing seal wear. | 1. Grind seal face or replace mechanical seal. 2. Ensure stable seal water supply. 3. Repair thrust bearing, control shaft axial movement. 4. Realign and standardize installation. 5. Install inlet filter, purify medium. |
| 8 | Severe shaft seal leakage (packing) | 1. Packing worn, aged. 2. Gland too loose or uneven, too tight. 3. Shaft or sleeve damaged, bent. 4. Insufficient lubrication/cooling water. 5. Medium contains high sand content. | 1. Replace packing (check every 2000 h). 2. Evenly tighten gland, adjust to slow drip. 3. Repair, polish, or replace shaft/sleeve. 4. Ensure clean cooling/lubrication water. 5. Purify water; replace sleeve if necessary. |
| 9 | Long shaft axial movement / large axial vibration | 1. Thrust bearing wear. 2. Incorrect shaft end clearance. 3. Loose or poorly lubricated coupling. 4. Vertical deviation of delivery pipe. | 1. Inspect and replace thrust bearing. 2. Adjust shaft end clearance per manufacturer. 3. Tighten and lubricate coupling. 4. Correct verticality of delivery pipe (≤2 mm/m). |
| 10 | Sudden increase in operating power | 1. Impeller axial clearance too small, rubs guide vanes. 2. Sand in water causing blockage. 3. Motor bearing damaged. | 1. Stop pump, adjust impeller axial clearance. 2. Dismantle and clean pump, improve water quality. 3. Replace motor bearing. |
| 11 | Pump body or connection leakage | 1. Pump seals (O-ring, gasket) aged or damaged. 2. Loose or uneven bolts. 3. Casting defects (porosity, cracks). | 1. Replace damaged seals. 2. Tighten all bolts evenly. 3. Repair defects; replace pump body if severe. |
| 12 | Delivery pipe or drive shaft breakage | 1. Material defect, fatigue, or corrosion. 2. Misalignment causing additional bending. 3. Operation in resonance zone. 4. Water hammer. | 1. Replace with qualified material, apply anti-corrosion treatment. 2. Ensure coaxial alignment during installation. 3. Eliminate vibration source, avoid resonance. 4. Install water hammer eliminator or slow-closing check valve. |
| 13 | Deep well pump-specific faults | 1. Cable or joint water ingress. 2. Motor chamber not filled with clean pre-lubrication water. 3. Phase missing or long-term overload. | 1. Repair or replace waterproof cable/joints. 2. Ensure motor chamber always filled with clean water. 3. Check protection devices, avoid phase loss and overload. |
Learn the maintenance practices that help improve vertical turbine pump reliability and reduce downtime.
| Daily Maintenance and Care for Vertical Turbine Pump | ||
| Maintenance Category | Maintenance Item | Detailed Content & Standards |
| I. Pre-Operation Inspection | 1. Appearance & Connection Inspection | • Check pump, motor, pipelines, and pipe joints for looseness, leakage, damage, or deformation. • Check whether anchor bolts, coupling guards, and other fasteners are secure. |
| 2. Lubrication System Inspection | • Oil lubrication: Check whether the oil level in the bearing housing is at the centerline of the oil sight glass and whether the oil is clean and transparent. Replace immediately if emulsified, discolored, or contaminated. • Grease lubrication: Check whether grease quantity is sufficient. It is recommended to use special waterproof or water-resistant grease. | |
| 3. Manual Rotation & Rotation Direction Confirmation | • Manual turning: Rotate the coupling manually to check whether the rotor rotates flexibly and evenly without abnormal friction noise. • Jogging rotation check: Jog the motor to confirm that the rotation direction matches the arrow indicated on the pump. | |
| 4. Sealing & Priming Water | • Check whether the cooling/flushing water system of the mechanical seal is unobstructed and whether the pressure is normal (recommended 0.1–0.3 MPa). • For packing seals, check the gland tightness. • Open the pump vent plug, fill the pump with liquid, and completely vent the air inside the pump. | |
| II. Monitoring During Operation | 1. Operating Parameter Monitoring | • Pressure & flow: Monitor outlet pressure and flow to ensure operation within the rated range on the pump nameplate for optimal efficiency. • Motor current & temperature: Motor current should remain within the rated range; motor surface temperature should not be excessively high. |
| 2. Bearing Condition Monitoring | • Temperature: Bearing temperature should not exceed ambient temperature by 35°C, and the maximum temperature should not exceed 80°C. • Vibration: Measure vibration regularly. At 1800 r/min, vibration velocity RMS should generally not exceed 4.5 mm/s. | |
| 3. Seal Leakage Monitoring | • Mechanical seal: Normal leakage should not exceed 5 drops/minute. • Packing seal: Adjust the gland to maintain leakage at approximately 30–60 drops/minute. Adjust if leakage is too much or too little. | |
| 4. Abnormal Noise & Vibration Monitoring | • Monitor operating sound. Normal sound should be stable and uniform. If severe friction, knocking, or periodic vibration occurs, stop the pump immediately for inspection. | |
| III. Periodic Maintenance (Preventive) | 1. Lubrication Management | • Oil change cycle: Change oil after the first 100 hours of operation, then every 500 hours thereafter. Depending on speed: high-speed pumps (2900 rpm) every 400 hours; low-speed pumps (1450 rpm) every 600 hours. • Grease replenishment: Replenish regularly; inspect grease condition every 200 hours of operation. |
| 2. Shaft Seal System Maintenance | • Packing seal: Regularly adjust gland tightness. “Three-finger method”: slight resistance during manual rotation is appropriate. Replace packing approximately every 2000 operating hours. • Mechanical seal: Check flushing water pressure and flow to ensure clean water continuously passes through the seal faces. | |
| 3. Bearing & Shaft Sleeve Inspection | • Regularly inspect wear of guide bearings and thrust bearings. • Inspect shaft sleeve wear and replace promptly if severe. | |
| 4. Impeller & Clearance Inspection | • Inspect impeller for cavitation, corrosion, wear, or scaling, and clean flow passages. • Check the clearance between impeller and seal ring (wear ring). Allowable deviation is generally ≤0.5 mm; replace if worn beyond the limit. | |
| 5. Alignment & Tightening | • Regularly inspect and correct alignment between pump shaft and motor shaft (deviation requirement generally ≤0.05 mm). • Retighten all anchor bolts and pipeline connections. | |
| 6. Electrical & Pipeline Inspection | • Regularly inspect motor insulation performance. • Check whether valves operate flexibly, whether pipe supports are secure, and clean inlet filters. | |
| IV. Long-Term Shutdown & Seasonal Maintenance | 1. Winter Freeze Protection | • When ambient temperature is below 0°C, drain all liquid from the pump and cooling water system to prevent freezing and cracking. |
| 2. Long-Term Shutdown Maintenance | • Drain the medium inside the pump and thoroughly clean the pump body and flow passages. • Disassemble the pump, wipe all parts clean, apply anti-rust oil to rotating and mating surfaces, and reinstall the piping. • For standby pumps, implement the “3-3-3 activation system”: rotate manually every 3 days by 120°, run with load for 30 minutes every 3 weeks, and replace sealing water every 3 months. | |
| V. Special Structural Maintenance Requirements | 1. Long Shaft Alignment & Verticality | • During installation and maintenance, ensure concentricity of each transmission shaft section and verticality of the delivery pipe to prevent abnormal vibration and wear caused by misalignment. |
| 2. Guide Bearing Lubrication | • For water-lubricated guide bearings, ensure clean lubrication water is continuously supplied. For grease-lubricated guide bearings, add grease strictly according to schedule. | |
| 3. Submergence Depth Monitoring | • Ensure the pump suction bell has sufficient submergence depth (generally >1 m) to prevent air entrainment, cavitation, and vibration. | |
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