Flow Range: 2.5~800 m3/h

Head Range: 30~330 m

Fluid Temperature: -45~420 ℃
 

1. General Installation Requirements

1. Installation and alignment shall be carried out meticulously. Poor installation will seriously affect the pump's stable operation and service life.

2. The installation height, length and pipe diameter of the pump suction pipeline shall comply with calculated values. Keep the pipeline as short as possible to minimize pressure loss, and ensure the pump operates within the allowable net positive suction head (NPSH).

3. Supports shall be fitted for both suction and discharge pipelines. The pump shall not bear any load from connected pipelines.

4. The installation site shall be spacious enough to facilitate subsequent maintenance and inspection.

2. Installation Procedure

1. Place the pump unit on the foundation pre-embedded with anchor bolts. Use paired wedge shims between the base and foundation for level alignment.

2. Disconnect the coupling. Place level gauges on the pump shaft and base respectively. Adjust the wedge shims to level the unit, then lightly tighten the anchor bolts to prevent displacement.

3. Align the concentricity of the pump shaft and motor shaft. The allowable deviation of the coupling face clearance is 0.1 mm, and the total tolerance for uniform clearance is 0.3 mm.

4. After connecting all pipelines and confirming the motor rotation direction, refit the coupling and recheck the shaft concentricity.

5. Conduct a final inspection after 2 to 3 hours of trial operation. The installation is deemed qualified if no abnormalities occur. Monitor bearing temperature and vibration during the trial run.

6. Cover all openings of the unit during installation to prevent foreign matter from entering the equipment.

7. For newly installed pipelines, install a strainer on the suction side of the pump to block debris. The effective cross-sectional area of the strainer shall be 2 to 3 times that of the suction pipeline.

1. Pump fails to start or starts with excessive load

1. Pump fails to start or starts with excessive load

(1) Abnormal prime mover or power supply

Solution: Check the power supply and prime mover.

(2) Pump seized

Solution: Rotate the coupling manually for inspection. Dismantle the pump if necessary and eliminate faults of rotating and stationary parts.

(3) Over-tightened packing

Solution: Loosen the packing.

(4) Discharge valve not closed

Solution: Close the discharge valve and restart the pump.

(5) Blocked balance pipe

Solution: Clear the balance pipe.

2. No liquid discharged from the pump

(1) Insufficient priming (gas not fully exhausted inside the pump)

Solution: Re-prime the pump.

(2) Wrong rotation direction

Solution: Verify the rotation direction.

(3) Excessively low rotating speed

Solution: Check and increase the rotating speed.

(4) Clogged strainer or malfunctioning foot valve

Solution: Inspect the strainer and remove foreign debris.

(5) Excessive suction lift or vacuum inside the liquid suction tank

Solution: Reduce the suction lift; check the pressure of the suction tank.

3. Liquid discharge interrupted after normal operation

(1) Air leakage from the suction pipeline

Solution: Inspect pipe joints and packing gland seals on the suction side.

(2) Residual gas on the suction side after priming

Solution: Re-prime the pump thoroughly.

(3) Suction port suddenly blocked by foreign objects

Solution: Stop the pump and remove the obstructions.

(4) Large amount of gas drawn in

Solution: Check for vortex at the suction inlet and verify the liquid submergence depth.

4. Insufficient flow rate

(1) Same causes as Item 2 (b, c)

Solution: Adopt corresponding remedies.

(2) Increased static head of the system

Solution: Check liquid level and system pressure.

(3) Increased resistance loss

Solution: Inspect pipelines, check valves and other obstructions.

(4) Severe wear of wear rings on pump casing and impeller

Solution: Replace or repair the wear rings and impeller.

(5) Liquid leakage at other positions

Solution: Inspect shaft seals and related components.

(6) Clogging, wear or corrosion of pump impeller

Solution: Clean, inspect or replace the impeller.

5. Insufficient head

(1) Same causes as Item 2 (1)(2)(3)(4), Item 3 (1) and Item 4 (6)

Solution: Adopt corresponding remedies.

(2) Reversed installation of double-suction impeller

Solution: Inspect and reinstall the impeller correctly.

(3) Liquid density and viscosity inconsistent with design parameters

Solution: Test the physical properties of the liquid.

(4) Excessively high operating flow rate

Solution: Reduce the flow rate.

6. Excessive power consumption during operation

(1) Friction between impeller and wear ring, or between impeller and pump casing

Solution: Inspect and repair the faulty parts.

(2) Same cause as Item 5 (4)

Solution: Reduce the flow rate.

(3) Increased liquid density

Solution: Check the liquid density.

(4) Over-tightened packing or dry friction

Solution: Loosen the packing and inspect the sealing water pipe.

(5) Damaged bearing

Solution: Inspect, repair or replace the bearing.

(6) Excessively high rotating speed

Solution: Check the driver and power supply.

(7) Bent pump shaft

Solution: Straighten the pump shaft.

(8) Malfunction of axial thrust balancing device

Solution: Check whether balance holes and return pipes are blocked.

(9) Misaligned coupling or too small axial clearance

Solution: Check coupling alignment and adjust the axial clearance.

7. Pump vibration or abnormal noise

(1) Same causes as Item 3 (4), Item 6 (5)(7)(9)

Solution: Adopt corresponding remedies.

(2) Vibration frequency: 0~40% of rated speed

Causes: Excessive bearing clearance, loose bearing bush, impurities in lubricating oil, poor oil quality (viscosity & temperature), oil foaming caused by air or process liquid, poor lubrication, damaged bearings.

Solution: Take targeted measures after inspection, such as adjusting bearing clearance, removing impurities and replacing lubricating oil.

(3) Vibration frequency: 60%~100% of rated speed

Causes: Bearing faults as described in (2), excessive seal clearance, loose retaining ring or worn seal.

Solution: Inspect, adjust or replace the seal assembly.

(4) Vibration frequency: 2 times of rated speed

Causes: Misalignment, loose coupling, seal friction, deformed pump casing, damaged bearings, support resonance, damaged thrust bearing, bent shaft and poor fitting tolerance.

Solution: Inspect, repair, adjust or replace relevant components.

(5) Vibration frequency: n times of rated speed

Causes: Pressure pulsation, misalignment, deformed casing, seal friction, base/support resonance, pipeline or unit resonance.

Solution: Follow remedies in (4); reinforce the foundation or pipelines.

(6) Extremely high vibration frequency

Causes: Shaft friction, inaccurate sealing and bearings, bearing chattering and defective shrink fit.

Solution: Follow remedies in (4).

8. Overheated bearing

(1) Substandard scraping and fitting of bearing pads

Solution: Refurbish or replace the bearing pads.

(2) Insufficient bearing clearance

Solution: Readjust or re-scrape the bearing clearance.

(3) Insufficient or deteriorated lubricating oil

Solution: Top up lubricant or replace the oil.

(4) Improper bearing assembly

Solution: Recheck assembly and eliminate defects.

(5) Cooling water interruption

Solution: Inspect and repair the cooling system.

(6) Worn or loose bearing

Solution: Repair or replace the bearing; retighten relevant bolts if loose.

(7) Bent pump shaft

Solution: Straighten the pump shaft.

(8) Deformed oil slinger failing to rotate and deliver oil

Solution: Replace the oil slinger.

(9) Misaligned coupling or too small axial clearance

Solution: Check coupling alignment and adjust the axial clearance.

9. Overheated shaft seal

(1) Over-tightened packing or abnormal friction

Solution: Loosen the packing and inspect the sealing water pipe.

(2) Misaligned sealing ring and sealing water pipe

Solution: Realign the components.

(3) Malfunction of flushing and cooling system

Solution: Inspect the flushing and cooling circulation pipeline.

(4) Faulty mechanical seal

Solution: Inspect and repair the mechanical seal.

10. Excessive rotor axial movement

(1) Improper operation, operating condition far away from the design point

Solution: Standardize operation and keep the pump running near design conditions.

(2) Blocked balance pipeline

Solution: Clear the balance pipe.

(3) Unqualified material of balance disc and balance disc seat

Solution: Replace with balance disc and seat made of qualified materials.

11. Water hammer

(1) Sudden power failure causes system pressure fluctuation and negative pressure in discharge pipeline. Dissolved gas escapes and accumulates inside the pump and pipes.

Solution: Fully exhaust all gas from the system.

(2) Rapid backflow of high-pressure liquid column due to power failure, impacting the check valve plate at pump outlet.

Solution: Modify the layout of discharge pipelines and pipe fittings.

(3) Outlet valve closed too quickly

Solution: Close the valve slowly.