Multi-stage shielding pump common fault repair methods and routine maintenance

1 routine maintenance

1.1 regularly clean the machine class, keep the components clean, no oil on the pump, crystallization, dust and foreign bodies.

1.2 parts complete, indicating instruments sensitive and reliable.

1.3 fill in the operating records on time, so accurate, complete, neat.

1.4 tour inspection on time.

1.4.1 according to the prescribed time, the line carefully do tour inspection and maintenance work. Check the content mainly from the following:

a. The operating parameters of each system, the pressure of various parts, temperature, flow, level and pump operation.

b. Centrifugal pump TRG indicates the reality.

C. chemical pumps sound body and a motor, temperature and vibration.

d. Equipment sealing points leaks.

e. Pump and pipe insulation and fluid flow.

f. Pump instrumentation instructions, regulating valve action, the electrical system and the operation of the signal device.

g. Equipment cleanliness.

h. Standby equipment backup.

i. Equipment insulation, corrosion and electrostatic grounding.

1.4.2 operator tour inspection once an hour, fill in tour records. Electrical and mechanical instrument maintenance personnel at least tour inspection twice, and make inspection records.

1.4.3 The problems found in the inspection shall be handled in time according to the respective responsibilities of each type of work and the relevant maintenance regulations; the parts with potential operation risks shall be inspected and monitored for their operational status; if they can not be dealt with promptly, they shall be reported to their superiors promptly.

1.5 timely cleaning pump filter, filter mesh to achieve a reasonable number and keep the filter without debris.

2 regular inspection

2.1 pipe shield pump operation inspection

a. Check whether the current exceeds the rated current.

b. Check if the pressure gauge reading is at the specified value.

c. TRG meter indication is normal.

d. Sound of operation, vibration with or without anomalies.

2.2 spare equipment inspection

Shielding pump regularly check the standby power supply equipment, instruments, chain is in good condition. Once a month after the start of the switch to check, so that it is in a good standby state. Spare equipment should have good anti-corrosion, antifreeze measures.

2.3 common troubleshooting

Common failures and treatment methods in Table 2.

Table 2 common faults and methods of treatment

Symptoms

cause of issue

Approach

TRG hands gradually increase the indicator, the pointer does not swing.

1. The power supply voltage increases.

2. Bearing wear increased.

1. Check the terminal voltage is normal.

2. Check bearing wear, such as replacement of the new bearing over the required value.

TRG pointer swing no rules, pump flow, pressure instability, the internal sound is not normal, and sometimes the end of fever

1. The pump inlet valve is not open.

2. circulating fluid bubble.

1. Check the circulating fluid line, pump inlet valve in place.

2. Exhaust through the pump exhaust.

TRG pointer suddenly rose to the red zone, the needle swing amplitude increases and regular fluctuations, and accompanied by abnormal sound.

1. Rotor cage expansion caused by partial broken bar.

2. Impeller shaking, bending axis, mouth ring wear.

1. For the same model new rotor.

2. Disassemble the electric pump housing to check for damage, replace the new parts.

Abnormal bearing wear

Mixed with debris

Check the filter selection is in line with the provisions of the filter is damaged.

Pump overheated

1. The pump circulation pipe fails, the pump tail condensation valve is not open.

2. Bearing wear.

1. Turn on the pump tail condensate valve to keep the circulation tube open.

2 replacement of new bearings and related accessories.

Pump vibration and noise is too large

1. Axis bending deformation.

2. Foreign body blocked.

3. Inhalation resistance.

4. Pump inlet line pressure is too low.

5. The pump memory has gas phase.

1. Align the original axis or replace the new one.

2. Clear the foreign body and prevent it from happening again.

3. Check the cleaning filter and check the piping.

4. Timely pressure on the import pipeline or product storage tank.

5 Follow the procedure to vent.