1. The Pump Cannot Start or Load
Here are the possible causes and solutions:
(1) The prime mover or power supply is not functioning properly. Check the power source and the prime mover for any issues.
(2) The pump may be jammed. Inspect the coupling manually, perform a disassembly check if necessary, and address any static or dynamic part issues.
(3) The packing might be too tight. Loosen the packing to reduce resistance.
(4) The discharge valve could be open. Close the valve and attempt to restart the pump.
(5) The balance pipe might be clogged. Clear the balance tube to ensure smooth operation.
2. The Pump Is Not Priming
Possible reasons and solutions include:
(1) The pump may not have been primed correctly, or there's air trapped in the system. Re-prime the pump to remove air.
(2) The pump may not be rotating in the correct direction. Verify the rotation direction and adjust if needed.
(3) The pump speed may be too low. Check the speed and increase it as required.
(4) A clogged filter or faulty valve can cause this issue. Inspect the filter and clear any debris.
(5) The suction height may be too high, or the suction tank may be under vacuum. Lower the suction height and check the tank pressure.
3. The Pump Starts but Then Loses Prime
Common causes and solutions are:
(1) There may be a leak in the suction piping. Inspect the connections and stuffing box for leaks.
(2) Air may still be trapped in the suction side. Re-prime the pump thoroughly.
(3) Foreign objects may have blocked the suction side. Stop the pump and remove the obstruction.
(4) Large amounts of gas may be entering the pump. Check the inlet whirlpool and ensure sufficient submergence depth.
4. Insufficient Flow
Reasons and remedies include:
(1) Similar issues as those listed in point 2. Take appropriate corrective actions.
(2) The system static head may have increased. Check the liquid level and system pressure.
(3) Increased resistance in the pipeline or valves can reduce flow. Inspect the pipeline and valves for blockages.
(4) Worn wear rings between the casing and impeller can cause inefficiency. Replace or repair the affected parts.
(5) Other leakage points in the system may exist. Inspect all seals and components for damage or wear.
(6) Impeller blockage, wear, or corrosion can affect performance. Clean, inspect, and replace the impeller if necessary.
5. Excessive Head
Causes and solutions include:
(1) Similar issues as mentioned in previous sections. Adjust accordingly.
(2) The impeller may be mounted incorrectly, especially in double-suction pumps. Check the impeller installation.
(3) The liquid’s density or viscosity may differ from the design specifications. Verify the liquid properties and adjust as needed.
(4) The operating flow rate may be too high. Reduce the flow to match the pump’s capacity.
6. High Power Consumption
Common causes and solutions are:
(1) Friction between the impeller and wear ring or casing may occur. Inspect and repair as necessary.
(2) Similar to issue (4) in section 4. Reduce the flow rate if needed.
(3) Increased liquid density can lead to higher power consumption. Check the liquid density and adjust accordingly.
(4) Packing that is too tight or dry friction can increase energy use. Loosen the packing and check the water seal system.
(5) Damaged bearings can also cause high power usage. Inspect and replace damaged bearings.
(6) Excessive speed can overload the motor. Check the driver and power supply for stability.
(7) Shaft bending can create imbalance and increase power demand. Correct the shaft alignment.
(8) Failure in axial force balance can cause inefficiencies. Check the balance hole and return line for blockages.
(9) Misalignment or improper clearance in the coupling can cause vibration and increased power use. Align the coupling and adjust the clearance.
7. Pump Vibration or Unusual Noise
Various causes and solutions include:
(1) Similar issues as mentioned in earlier sections. Address them accordingly.
(2) If the vibration frequency is between 0% and 40% of the working speed, it may indicate bearing problems, oil contamination, or poor lubrication. Check and adjust the bearing clearance, clean the oil, and replace it if necessary.
(3) If the frequency is between 60% and 100%, it may relate to bearing issues or seal wear. Inspect and adjust or replace the seal.
(4) At twice the working speed, misalignment, coupling issues, or bearing resonance could be the cause. Check, repair, or replace as needed.
(5) At n times the working speed, pressure pulsations or structural issues may be present. Strengthen the foundation or piping to reduce resonance.
(6) Very high-frequency vibrations may indicate shaft friction, seal issues, or poor fit. Follow similar steps as above for resolution.
8. Bearing Overheating
Possible reasons and solutions include:
(1) Poorly scraped bearing pads may need repair or replacement.
(2) Too small a bearing clearance can cause overheating. Adjust the clearance or re-scrape the bearing.
(3) Lack of oil or poor oil quality can lead to overheating. Add more oil or replace it with fresh lubricant.
(4) Improper bearing assembly may require rechecking and adjustment.
(5) Issues with the cooling water circuit should be inspected and repaired.
(6) Worn or loose bearings may need replacement. Tighten bolts if necessary.
(7) A bent shaft can cause uneven load distribution. Correct the shaft alignment.
(8) A deformed oil slinger may prevent proper lubrication. Replace the oil slinger if needed.
(9) Coupling misalignment or insufficient axial clearance can cause excessive heat. Check and adjust the alignment and clearance.
9. Seal Overheating
Causes and solutions include:
(1) Packing that is too tight or causing friction can lead to overheating. Loosen the packing and check the water seal system.
(2) Misalignment of the water seal or its tube may require realignment.
(3) Inadequate flushing or cooling can result in overheating. Check the flushing and cooling system for blockages or malfunctions.
(4) A faulty mechanical seal may need inspection and replacement.
10. Excessive Rotor Movement
Reasons and solutions include:
(1) Improper operation or running conditions far from the design range can cause this. Ensure the pump operates near its designed conditions.
(2) A blocked balance pipe can lead to instability. Clear the balance tube to restore balance.
(3) Materials used for the balance plate or seat may not meet requirements. Replace them with suitable materials.
11. Water Hammer Occurred
Possible causes and solutions include:
(1) Sudden power outages can cause pressure fluctuations and negative pressure in the system. This may allow dissolved gases to escape. Purge the gas from the system.
(2) A sudden influx of high-pressure liquid due to power loss can strike the pump outlet check valve. Redesign the pipeline and discharge system to prevent such occurrences.
(3) Closing the discharge valve too quickly can cause water hammer. Slow down the closing process to avoid sudden pressure surges.
High-temperature 1-color Pyrometer
This classification includes one color infrared pyrometers measuring range start from 700℃.
One color pyrometer determine the object temperature by receiving the sum of the narrow-band radiation energy, around(0.85~1.1)μm, emitted by the object. product detector nornally use si.
In one color mode, pyrometer measure the average temperature in an area. Instrument`s focal length range from 0.35m to infinite, the measurement distance can be infinite as long as the target size is large enough.
One color mode is suitable for measure below object: surface is relatively flat (not curved), and the measurement direction is less than 30°, surface physical and chemical state of the is stable (not in the process of oxidation, vaporization, and liquefaction), and the optical channel should with less dust and without blocking and attenuation. When the background temperature is higher than the measured temperature , the temperature can also be measured in the one color mode.
One color mode is used to measure large objects. Before measurement, make sure object can completely cover the field of view. Generally, object size should be greater than 20% of the field of view.
In this catalog, pyrometers applied to temperature measurement in the various industries, such as: inductioin heating,heat treatment,single crystal furnace, polycrystalline furnace, vacuum furnace, high temperature glass, metallugical forging, also suitable for temperature measurement in a good environment.
industrial infrared pyrometer, fixed infrared pyrometer, 1-color infrared pyrometer, monochromatic pyrometer
Changzhou Sijie Optoelectronics Technology Co.,Ltd. , https://www.sjinfrared.com