What are the common faults of acid resistant pumps in Dalian and how to quickly repair them

1、 Common fault types of acid resistant pumps in Dalian

As a key equipment for transporting corrosive media in industries such as chemical, metallurgical, and electroplating, acid resistant pumps have a direct impact on production efficiency and safety in terms of their operational status. The following are common types of faults in acid resistant pumps:

1. Mechanical seal leakage

Mechanical seal is one of the components that are prone to problems in acid resistant pumps, mainly manifested as:

Wear of the contact surface between the stationary and moving rings

Aging and deformation of sealing ring

Spring failure leads to insufficient sealing pressure

Solid particles are stuck on the sealing surface

2. Bearing damage

Overheating of bearings leads to lubrication failure

Water ingress or corrosion in the bearing chamber

Excessive bearing clearance generates vibration

Improper installation of bearings leads to eccentric wear

3. Corrosion and perforation of pump body

The concentration of the medium exceeds the corrosion resistance range of the pump body material

Excessive local flow velocity leads to erosion and corrosion

Improper material selection

The usage temperature exceeds the design range

4. Wear or corrosion of impeller

The presence of solid particles in the medium causes wear and tear

Surface pitting caused by cavitation phenomenon

Insufficient corrosion resistance of the material

Dynamic balance failure of impeller

5. Motor malfunction

Overload causes winding burnout

Decreased insulation performance

Corrosion of wiring terminals

Cooling system failure

6. Performance degradation

insufficient traffic

Head reduction

efficiency decline

Abnormal increase in power

2、 Quick diagnostic method

1. Sensory examination method

Listen: Abnormal noise (bearing damage, cavitation sound)

See: leakage traces, vibration situation, instrument readings

Touch: bearing temperature, vibration intensity

Smell: insulation burning smell, medium leakage smell

2. Instrument detection method

Ammeter detects motor load

Check the inlet and outlet pressure of the pressure gauge

Vibration detector measures vibration values

Infrared thermometer monitors bearing temperature

3. Segmented exclusion method

Disconnect the coupling and test the motor separately

Check the resistance of the pipeline system

Test the no-load performance

Compare historical operational data

3、 Rapid repair technology

1. Emergency response to mechanical seal leakage

Temporary measures:

Slight leakage can be adjusted by tightening the gland bolt appropriately (not exceeding half a turn)

Temporarily seal with specialized sealant

Install emergency leak collection device

Thoroughly repair:

Stop the machine to release pressure and empty the medium

Disassemble the sealing components and check for wear and tear

Replace damaged static, dynamic, or sealing rings

Clean the sealed chamber to ensure there are no impurities

Reinstall according to the standard and adjust the compression amount

2. Quick replacement of bearing faults

Operation steps:

Use a puller to disassemble old bearings

Clean the bearing chamber and check for journal wear

Install the new bearing after heating it to 80-100 ℃

Add an appropriate amount of lubricating grease (fill 1/3-1/2 space)

Adjust the bearing clearance and check the rotational flexibility

Notes:

Use specialized tools to avoid damaging the shaft neck

Ensure that the bearings are installed perpendicular to the shaft

Select corrosion-resistant special lubricating grease

3. Local repair technology for pump body

Emergency response for small area perforation:

Surface treatment: Polish to a metallic luster

Layered repair using acid resistant epoxy resin and fiberglass cloth

Perform pressure test after curing

Extensive damage:

Replace the entire pump body or damaged components

Consider upgrading the material grade (such as upgrading from 304 to 316L)

4. Key points for impeller maintenance

Minor wear can be corrected for dynamic balance

Severe corrosion requires replacement

The new impeller needs to undergo static balance testing

Pay attention to adjusting the axial clearance during installation

5. Motor fault handling

Partial short circuit of winding:

Partial repair using insulating paint

Perform a pressure test after drying

Bearing issues:

Replace bearings of the same model

Check the fit size of the shaft neck

Corrosion of wiring terminals:

Replace the terminal and perform anti-corrosion treatment

Improving Corrosion Resistance by Using Copper Tin Plated Terminals

4、 Preventive maintenance strategy

1. Daily inspection content

Leakage monitoring (mechanical seals, flange connections)

Vibration and noise recording

Bearing temperature tracking

Performance parameter comparison

2. Regular maintenance projects

Check the mechanical seal status every 3 months

Replace lubricating grease every 6 months

Conduct a comprehensive disassembly inspection every year

Regularly calibrate monitoring instruments

3. Precautions for operation

Strictly prohibit idling operation

Ensure that the pump is filled with liquid before starting

Avoid long-term low traffic operation

Thoroughly drain corrosive media when not in use

4. Spare parts management

Reserve key vulnerable parts (mechanical seals, bearings)

Select original or equivalent quality spare parts

Establish a spare parts replacement record file

5、 Maintenance safety precautions

Medium safety: Thoroughly drain and flush the corrosive medium inside the pump before maintenance

Energy isolation: Power off and lock to ensure that the equipment cannot be accidentally started

Personal protection: Wear acid resistant protective clothing, face mask, and gloves

Tool preparation: Use explosion-proof tools to handle flammable media environments

Waste disposal: Dispose of components containing corrosive substances in accordance with hazardous waste management regulations

Through systematic fault diagnosis and standardized maintenance operations, the maintenance efficiency of acid resistant pumps can be improved, downtime can be reduced, and maintenance quality and operational safety can be ensured. Establishing a comprehensive preventive maintenance system is a more effective way to reduce failure rates and extend equipment lifespan.