In the process of daily use of pumps, we should strengthen the maintenance of
centrifugal pumps and increase relevant maintenance knowledge:
5.1 Routine Maintenance
5.1.1 Check flow rate, head, current, oil temperature, oil pressure, vibration of growth box, sealing leakage and no abnormal phenomenon, and carefully fill in the record.
5.1.2 The oil filter and lubricating oil should be changed every six months, and SHS 01002-2004 Lubrication Management System for Petrochemical Equipment should be strictly implemented.
5.1.3 Oil cooler cleans scale and other impurities every six months.
5.1.4 Carry out inspection and maintenance according to process operation rules to eliminate defects.
5.2 Common Faults and Handling (See Table 6)
Table 6 Common faults and solutions
The serial number
The fault phenomenon
The cause of the problem
Processing method
1
No flow or insufficient flow, no pressure or insufficient pressure
The pump is not full of
Material liquid evaporation
The inlet pipe leaks air
Suction head is low
Motor reversal
Improper impeller assembly
Poor suction line
Impeller back clearance is too large
Exhaust the pump gas
Fully cool the feed liquid
Treatment tube leakage, prevent into volatile liquid
Increase the suction head
Correct motor wiring
Install impeller correctly
Clean suction line
Adjust impeller back clearance
2
High pressure fluctuation
Flow rate is too low
Suction head is low
The flow control valve failed
Two pumps in parallel, running at the same time grab material
The liquid separator is severely corroded
Increase flow (open bypass valve if necessary)
Increase suction pressure
Service control valve
Stop a pump
Repair or replace the rotary separator
3
Motor overload
The viscosity and specific gravity of material liquid increase or bring in solid particles
The internal surface of the pump is seriously corroded
The diffuser throat diameter is enlarged
Mechanical failure
Motor circuit failure
Improve the condition of the material and liquid, prevent the introduction of solid particles
Replacement parts
Disassembly inspection and repair
Disassembly inspection and repair
Troubleshooting the circuit
4
Mechanical seal leakage or oil leakage
Mechanical seal damage
Seal fluid or feed fluid into solid particles or impurities
When conveying low temperature feed liquid, take in water
Repair mechanical seal
Replace the filter screen to prevent solid particles or impurities from mixing
Prevent moisture; Or pour anti-pouring agent (such as ethanol, acetone, etc.) into the sealed cavity before starting.
5
Oil seal leakage
Oil seal is damaged
Replace the oil seal
6
The increase of oil foam tank
Oil deterioration
The oil level is too high
The oil temperature is too low
An oil change
Reduce oil
Adjust cooling water quantity
The serial number
The fault phenomenon
The cause of the problem
Processing method
7
The oil temperature of the growth tank is too high
Too much oil
The oil filter is blocked
Scale or insufficient water in oil cooler
Oil drain
Replace the oil filter
Descaling or water regulation
8
Vibration and noise increase
Gear, bearing, bearing and other parts are severely worn
Impeller, induction wheel and other serious wear or corrosion
The suction liquid is gaseous or vaporized
Disassemble repair or replacement
Repair, replace or verify dynamic balance
Remove the gas in the feed liquid, reduce the feed liquid temperature
9
The lubricating oil in the gearbox becomes milky or turbid yellow
Contamination of lubricating oil with water or medium
Check and eliminate
10
Low oil pressure
Oil level is too low
Heat exchanger leakage
Damage to fuel nozzle and oil pump
The oil filter is too dirty
Come on
Repair or replacement
Repair or replacement
Clean up the
