In the overhaul process, the pump fault diagnosis is a very crucial part, the following gives some common faults and elimination measures, for you to set the pump fault diagnosis. Other Industrial Aluminium Extrusions Other Industrial Aluminium Extrusions,Black Powder Coating Aluminium Profiles,Structural Aluminum Profile,High-Speed Train Aluminium Frame Foshan Modern Copper & Aluminum Extrusion Co.,Ltd. , https://www.fscncaluminium.com
1, no liquid to provide, insufficient liquid supply or lack of pressure
1) no water or no proper exhaust, the elimination of measures: Check the pump housing and inlet pipe are all filled with liquid.
2) The speed is too low, the elimination of measures: Check the motor wiring is correct, the voltage is normal or the turbine steam pressure is normal.
3) system head is too high, the elimination of measures: Check the system head (especially friction loss).
4) suction is too high, the elimination of measures: Check the existing net head (inlet pipe is too small or too long will cause great friction loss).
5) impeller or pipeline blocked, the elimination of measures: Check for any obstructions.
6) The direction of rotation is wrong, the elimination of measures: Check the direction of rotation.
7) air or inlet pipeline leakage, elimination measures: Check the inlet pipeline with or without cavitation and air leakage.
8) stuffing box packing or seal wear, so that air leakage into the pump casing, the elimination of measures: Check the packing or seal and replace as needed to check the lubrication is normal.
9) pumping hot or volatile liquid inhalation head shortage, elimination measures: increase suction head, consult the manufacturer.
10) the end of the valve is too small, the elimination of measures: the correct size of the valve installed at the end.
11) The end of the valve or inlet pipe immersion depth is not enough, the elimination of measures: to consult the factory to the correct depth of immersion. Eliminate eddies with baffles.
12) impeller clearance is too large, the elimination of measures: check the gap is correct.
13) impeller damage, elimination measures: check the impeller, according to the requirements of replacement.
14) impeller diameter is too small, the elimination of measures: consulting manufacturers to the correct impeller diameter.
15) pressure gauge position is not correct, the elimination of measures: check the location is correct, check the outlet nozzle or pipe.
2, the pump will stop running for a while
1) suction is too high, the elimination of measures: Check the existing net head (inlet line is too small or too long will cause a great friction loss).
2) impeller or pipeline blocked, the elimination of measures: check for any obstructions.
3) Leakage of air or inlet pipeline. Measures to eliminate: Check if there is air hole and / or air leakage in the inlet pipe.
4) Stuffing or seal wear in the stuffing box to allow air to leak into the pump housing. Elimination: Check packing or seal and replace as required. Check the lubrication is normal.
5) pumping hot or volatile liquid inhalation head shortage, elimination measures: increase inhalation of the head, consult the manufacturers.
6) At the end of the valve or inlet pipe immersion depth is not enough, the elimination of measures: Consult factory for the correct immersion depth, with a baffle to eliminate eddy currents.
7) pump casing gasket damage, the elimination of measures: Check the gasket and the situation to be replaced.
3, the pump power consumption is too large 1) The direction of rotation is wrong, the elimination of measures: Check the direction of rotation.
2) impeller damage, elimination measures: check the impeller, according to the requirements of replacement.
3) rotating parts bite, the elimination of measures: Check the internal wear parts of the gap is normal.
4) Shaft bending, elimination measures: Alignment axis or according to the requirements of the replacement.
5) speed is too high, the elimination of measures: Check the motor winding voltage or steam pressure delivered to the turbine.
6) head below the rated value. Pump too much liquid, eliminate the measure: consult the manufacturer. Install throttle valve, cut impeller.
7) liquid heavier than the expected value, the elimination of measures: check the proportion and viscosity.
8) The stuffing box does not have the correct stuffing (insufficient stuffing, improper stuffing or running-in, stuffing is too tight). Elimination measures: Check the stuffing and refill stuffing box.
9) bearing lubrication is not correct or bearing wear and tear, eliminate measures: check and replace as required.
10) wear ring between the running gap is not correct, the elimination of measures: check the gap is correct. Replace the wear rings of the pump housing and / or impeller as required.
11) Pump casing stress is too large, the elimination of measures: to eliminate stress and factory representatives advice. After eliminating the stress, check the alignment.
4, the stuffing box leak too much
1) Shaft bending, elimination measures: Alignment axis or replacement as required.
2) coupling or pump and drive misalignment, the elimination of measures: check the alignment, if necessary, re-alignment.
3) bearing lubrication is not correct or bearing wear and tear, measures to eliminate: check and replace as required.
5, the bearing temperature is too high 1) axis bending, elimination measures: straightening axis or according to the requirements of the replacement.
2) coupling or pump and drive misalignment, the elimination of measures: check the alignment, if necessary, re-alignment.
3) bearing lubrication is not correct or bearing wear and tear, measures to eliminate: check and replace as required.
4) Pump casing stress is too large, eliminate the measures: eliminate stress and advice to the manufacturer. After eliminating the stress, check the alignment.
5) too much lubricant, the elimination of measures: Remove the plug, so that too much fat automatically discharged. If it is an oil-lubricated pump, drain the oil to the correct oil level.
6, stuffing box overheating
1) Filler or seal wear in stuffing box to allow air to leak into pump housing. Remedy: Check packing or seal and replace as required. Check the lubrication is normal.
2) The stuffing box does not have the correct stuffing (insufficient stuffing, improper stuffing or running-in, stuffing is too tight). Elimination measures: Check the stuffing and refill stuffing box.
3) packing or mechanical seal design problems, the elimination of measures: consulting manufacturers.
4) mechanical seal damage, elimination measures: check and replace as required. Consult the manufacturer.
5) sleeve scratches, the elimination of measures: repair, re-machining or replacement as required.
6) packing is too tight or mechanical seal is not properly adjusted, the elimination of measures: Check and adjust the packing, according to the requirements of replacement. Adjust the mechanical seal (refer to the manufacturer's instructions provided with the pump or consult the manufacturer).
7, rotating parts are difficult to rotate or have friction
1) Shaft bending, elimination measures: Alignment axis or replacement as required.
2) wear ring between the running gap is not correct, the elimination of measures: Check the gap is correct. Replace pump housing or impeller wear ring as required.
3) pump casing stress is too large, the elimination of measures: eliminate stress and factory representatives advice. After eliminating the stress, check the alignment.
4) Shaft or impeller ring swings too much. Remedy: Check rotating parts and bearings and replace worn or damaged parts as required.
5) There is dirt between the impeller and the pump casing wear ring, dirt in the pump casing wear ring, and eliminate the measures: clean and inspect the wear ring and replace as required. Cut off and eliminate the source of dirt. a. The inlet and outlet valves are not open, the inlet and outlet lines are blocked, and the impeller is blocked
b. Motor running in the wrong direction, motor phase loss is very slow
c. Suction tube leak
d. The pump is not filled with liquid and there is air in the pump chamber
e. Inadequate imported water supply, suction stroke is too high, the valve leaking
f. pipeline resistance is too large, improper pump selection a. Check and remove the blockage
b. Adjust the motor direction and tighten the motor wiring
c. Tighten the sealing surfaces to eliminate the air
d. Open the pump cover or open the exhaust valve to drain the air
e. downtime inspection, adjustment (water pipe and pipette with the phenomenon of easy to use this phenomenon)
f. reduce the pipe bend, re-select the pump a. Press 1. Cause check first
b. Pipeline, pump impeller impeller blockage, scale deposition. Valve opening is not enough
c. Low voltage
d. impeller wear a. Press 1. to exclude
b. Remove the obstruction and readjust the valve opening
c. Regulated
d. Replace the impeller a. More than the rated flow
b. Exhaustion
c. Bearing wear a. Adjust the flow to close the outlet valve
b. decrease
c. Replace the bearing a. The pipe support is not stable
b. liquid mixed with gas
c. cavitation
d. bearing damage
e. Motor overload heating operation a. Secure the pipeline
b. Increase suction pressure exhaust
c. reduce the degree of vacuum
d. Replace the bearing
e. Adjust Press 5. a. Flow is too large, overloaded operation
b. Rubbing
c. Damaged motor bearings
d. Insufficient voltage a. Turn off the small outlet valve
b. check excluded
c. Replace the bearing
d. Regulated a. Mechanical seal wear
b. The pump body has sand holes or cracks
c. sealing surface is not flat
d. Loose mounting screws a. Change
b. welding repair or replacement
c. Trimming
d. Tighten Inhale air from the packing Change the packing seal or packing seal, increase the seal of the packing water Inhale air from the discharge valve Improve the sealing of the valve Inhale air from the pipe connection Find leaks and tighten Bottom valve failed Check and repair the valve Vacuum pump does not meet the requirements Check and repair the pump Suction solenoid valve is not required Check and repair the pump Do not have starting conditions Check if the starting conditions are met Protection loop work Check the protection device The prime mover has a problem Check, repair Pump, suction tube water is not filled Re-irrigation check the suction pipe connection and pump filling by air leaks Inhalation, discharge valve closed Open inhalation, discharge valve Filter, suction tube blocked Remove and remove foreign material There are foreign objects in the impeller Remove and remove foreign material The direction of rotation is reversed Correctly connect the motor wiring Inhaled air Check air intake at suction connection and pump packing Submerged depth not enough due to lower water level Extend the suction pipe and deepen the submergence depth There is foreign body in impeller blockage Remove and remove foreign material Rotor part of the serious wear and tear Repair by the manufacturer Pump, suction pipe insufficient water Irrigation again Inhaled air Check suction tightness, packing seal water Suction tube in the air accumulation Re-set the pipeline Rotation speed too fast Adjust the prime mover so that it reaches the specified number of revolutions In the design flow, the design of the state of operation outside the head Adjust the discharge valve opening The rotor contacts the housing Repaired by the manufacturer Mix mud and other foreign matter Clean the suction tank and take measures to prevent the inflow of foreign materials Packing tight pressure too tight Appropriate to relax the amount of compression Grease blocked, insufficient oil Make the appropriate adjustments Oil aging Change the oil Eccentric shaft Find again Bearing fault Check, repair or replace Packing tight pressure too tight Loose the packing a little to make the water slightly leaky Packing sealing water pressure is too large (by sealing water pressure seal) Reduce water pressure in sealed water pipes Packing seal water shortage Slightly raise the water pressure Impeller partially blocked Remove and remove foreign material Impeller damaged Remove and replace the impeller Traffic is too small Used near the design point Pump and the prime mover shaft is not concentric Fixed point to correct Bearing damaged Maintenance, inspection or replacement Mixed with air, cavitation occurs Change suction water level, improve suction pipe, run around design flow point
b. Motor running in the wrong direction, motor phase loss is very slow
c. Suction tube leak
d. The pump is not filled with liquid and there is air in the pump chamber
e. Inadequate imported water supply, suction stroke is too high, the valve leaking
f. pipeline resistance is too large, improper pump selection
a. Check and remove the blockage
b. Adjust the motor direction and tighten the motor wiring
c. Tighten the sealing surfaces to eliminate the air
d. Open the pump cover or open the exhaust valve to drain the air
e. downtime inspection, adjustment (water pipe and pipette with the phenomenon of easy to use this phenomenon)
f. reduce the pipe bend, re-select the pump
b. Pipeline, pump impeller impeller blockage, scale deposition. Valve opening is not enough
c. Low voltage
d. impeller wear
a. Press 1. to exclude
b. Remove the obstruction and readjust the valve opening
c. Regulated
d. Replace the impeller
b. Exhaustion
c. Bearing wear
a. Adjust the flow to close the outlet valve
b. decrease
c. Replace the bearing
b. liquid mixed with gas
c. cavitation
d. bearing damage
e. Motor overload heating operation
a. Secure the pipeline
b. Increase suction pressure exhaust
c. reduce the degree of vacuum
d. Replace the bearing
e. Adjust Press 5.
b. Rubbing
c. Damaged motor bearings
d. Insufficient voltage
a. Turn off the small outlet valve
b. check excluded
c. Replace the bearing
d. Regulated
b. The pump body has sand holes or cracks
c. sealing surface is not flat
d. Loose mounting screws
a. Change
b. welding repair or replacement
c. Trimming
d. Tighten
Reduce seal water pressure of water less than the sealing filler water slightly raise the water pressure
Common Faults and Solutions of Pumps
Causes of failure and troubleshooting
Symptoms
Possible causes
Method of exclusion
No water pump
2. The pump flow is insufficient
3. Power is too large
4 noise vibration
5. Motor heat
Pump leaks
General pump failure causes and measures
malfunction
the reason
Measures
Pump dissatisfied with the water
Can not start
No water
Can not reach the design flow
Drain from the beginning, but stopped immediately
overload
Bearing overheating
Overfilling filler
Pump vibration
Symptoms
Possible causes
Method of exclusion
No water pump
a. The inlet and outlet valves are not open, the inlet and outlet lines are blocked, and the impeller is blocked 2. The pump flow is insufficient
a. Press 1. Cause check first 3. Power is too large
a. More than the rated flow 4 noise vibration
a. The pipe support is not stable 5. Motor heat
a. Flow is too large, overloaded operation Pump leaks
a. Mechanical seal wear malfunction
the reason
Measures
Pump dissatisfied with the water
Inhalation of air from the packing Replacement of packing Sealing or compaction Packing seal to increase packing seal water Inhalation of air from discharge valve Improve valve tightness Inhalation of air from pipe connection Locate leaks and tighten bottom valve Unqualified Inspection, repair Valve vacuum pump substandard inspection, repair pump suction solenoid valve substandard inspection, repair pump Can not start
Does not have the start condition Check whether meets the start condition Protection circuit work Check the protection device The prime mover failure Check, repair No water
Pump, suction tube water is not filled Re-irrigation Check suction pipe connection and pump stuffing No air leakage suction, exhaust valve closed Open inhalation, discharge valve filter, suction tube blockage Removal and removal of foreign matter Foreign matter in the impeller Removal and Remove the foreign body rotation direction correctly connected the motor wiring Can not reach the design flow
Air suction Check air intake at suction pipe connections and pump fill No suction in depth due to lowered water level Extend suction pipe to deepen submergence Foreign matter blockage in impeller Removal and removal of foreign matter Rotor parts worn out Severely worn by the manufacturer Drain from the beginning, but stopped immediately
Pumps, suction pipes under-watering again Irrigation air suction Check suction tightness, sealing water at suction Packing air in suction pipe Resetting piping overload
Rotating too fast Adjust the prime mover so that it reaches the specified number of revolutions Operating at a design flow rate other than the design lift Adjust the discharge valve opening Swing body Contact with the shell Repair by the manufacturer Mix mud and other foreign matter Clean the suction sink and take Measures to prevent the inflow of foreign material Packing seal pressure too tight Proper relaxation of the amount of compression Bearing overheating
Grease blocked, inadequate oil to make appropriate adjustments Oil aging Replace lubricant shaft Eccentric re-alignment Bearing faulty Check, repair or replacement Overfilling filler
Filler seal tight too tight Loose packing, water slightly leaky Packing seal water pressure is too large (sealed by the seal pressure water seal) Pump vibration
Impeller partially removed by blockage and remove foreign matter Impeller damage Remove and replace Impeller flow is too small Use the pump near the design point is not the same as the original motor shaft Positioning Bearings Bearing repair Repair, check or replace the mixed air, cavitation Changes suction water level, improve Suction pipe, running near design flow point