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

1、Overview of acid resistant pump

Dalian acid resistant pump is a special pump specifically designed for transporting acidic media, widely used in industries such as chemical, metallurgical, electroplating, and pharmaceutical. Due to the special working environment, acid resistant pumps are usually made of corrosion-resistant materials such as polytetrafluoroethylene (PTFE), polypropylene (PP), fluoroplastic alloys, etc. However, even with excellent materials and advanced designs, acid resistant pumps may still experience various malfunctions during long-term use, affecting production efficiency and equipment lifespan.

2、Common fault types and cause analysis

1. The pump cannot start or has difficulty starting

Possible reasons:

Power failure or insufficient voltage

Motor winding burnt out or wiring error

The pump shaft is stuck or the mechanical seal is too tight

The impeller is stuck by foreign objects

Bearing damage leads to increased rotational resistance

2. Insufficient flow or no liquid output

Possible reasons:

Imported pipeline blockage or valve not fully opened

Severe wear or corrosion of the impeller

Pump speed below rated value

Inhalation height exceeds the allowable range

Wear of the sealing ring leads to increased internal leakage

3. Abnormal vibration and noise

Possible reasons:

Bending of pump shaft or misalignment of coupling

Bearing damage or poor lubrication

Unbalanced impeller or localized corrosion

Loose foundation or loose fixing bolts

Cavitation phenomenon occurs

4. Leakage issue

Possible reasons:

Mechanical seal damage or improper installation

Aging or corrosion of sealing gasket

Cracks or perforations appear on the pump casing

Severe wear of the shaft sleeve

Loose fasteners

5. Motor overload

Possible reasons:

The specific gravity or viscosity of the medium exceeds the design range

Friction between impeller and pump casing

Bearing damage leads to increased resistance

Voltage instability

Improper motor selection

3、Quick solution

1. Emergency response for pump failure to start

Steps:

First, check if the power supply is normal and measure if the voltage is within the rated range

Manually rotate and check if the pump shaft rotates flexibly. If there is any blockage, it needs to be disassembled and inspected

Check the resistance of the motor winding and confirm that there is no short circuit or open circuit

If the impeller is stuck, you can try rotating it in the opposite direction or disassembling it for cleaning

In emergency situations, the backup pump can be switched to ensure production continuity

2. Quick handling of insufficient traffic

measures:

Check and clean the inlet filter to ensure no blockage

Fully open the inlet valve and check if there are any air pockets in the pipeline

Measure the actual speed and check if the belt slips or if the frequency converter is set

If the impeller is severely worn, the operating point of the pump can be temporarily adjusted

Check the gap between the sealing rings and temporarily add gaskets for adjustment if necessary

3. Temporary solutions for abnormal vibration

Method:

Emergency stop to check the alignment of the coupling and adjust the gasket temporarily

Add lubricating grease or replace bearings (if spare parts are available)

Tighten the anchor bolts and pipe supports

If it is caused by cavitation, the speed can be temporarily reduced or the outlet valve can be turned down

Perform dynamic balance verification on the impeller (when conditions permit)

4. Quick handling of leakage issues

Emergency plan:

When there is a slight leakage, the gland bolts can be temporarily tightened (mechanical seal pumps should be used with caution)

Replace the sealing gasket or apply sealant temporarily to prevent leakage

Temporary repair of shell cracks can be carried out using metal glue or clamps

If the mechanical seal leaks, it can be temporarily changed to a packing seal (attention should be paid to corrosiveness)

Set up a liquid collection tray to collect leaked media and prevent environmental pollution

5. Quick handling of motor overload

Countermeasure:

Check if the medium parameters have changed, and dilute or heat if necessary

Adjust the opening of the outlet valve to reduce the load

Check the bearing temperature and replace it if necessary

Check if the motor cooling system is functioning properly

If overloaded for a long time, it is necessary to consider replacing the motor with a higher power

4、Preventive maintenance recommendations

Regular inspection system: Establish daily inspection and regular maintenance plans, record operating parameters

Lubrication management: Replace lubricating oil (grease) according to the prescribed cycle to ensure good lubrication of the bearings

Sealing maintenance: Regularly check the mechanical seal status and replace worn parts in a timely manner

Anti corrosion measures: Regularly inspect the corrosion of the pump body and perform anti-corrosion treatment if necessary

Spare parts reserve: Reserve vulnerable parts such as mechanical seals, bearings, impellers, etc., to shorten downtime

Operation training: Strengthen operator training to avoid malfunctions caused by misoperation

5、 Professional maintenance precautions

Before disassembly, the residual medium inside the pump must be thoroughly cleaned to prevent corrosion and poisoning

When replacing parts, original or equivalent quality corrosion-resistant materials must be used

Mechanical seal installation requires professional personnel to ensure flatness and compression capacity

After maintenance, a trial run must be conducted to gradually increase the load and observe the status

For special medium pumps, necessary leak prevention testing is required after maintenance

The troubleshooting of acid resistant pumps requires quick identification of the cause based on the actual situation on site and taking effective measures. Operators should be familiar with the structural principles of pumps, and master the characteristics and handling methods of common faults. At the same time, establishing a comprehensive preventive maintenance system is more important than post maintenance, as it can reduce the failure rate, extend the service life of equipment, and ensure the continuous and stable operation of production. For complex faults or major safety issues, professional maintenance personnel should be contacted in a timely manner to handle them, and blind operation should be avoided to avoid causing greater losses.