First, indicate the cause of the failure that is zero or move very little
1. The balance valve is not all closed or leaking
2. The high and low pressure valve at the root of the throttling device is not opened
3. The valves and pipelines between the throttling device and the differential pressure gauge are blocked
4. The steam pressure pipe is not completely condensed
5. The liner between the throttling device and the process pipeline is not tight
6. Internal failure of differential pressure gauge
In summary, the above treatment methods:
1. Close the balance valve and repair or replace it with a new one
2. Open the high and low pressure valve at the root of the throttling device
3. Flush the pipeline, repair or replace the valve
4. Open the table after complete condensation
5. Tighten bolts or change pads between the throttling device and the process pipeline
6. Check and repair the differential pressure gauge
Second, indicate the cause of the failure below zero
1. High and low pressure pipelines are reversed
2. The signal line is reversed
3. The high-pressure side pipeline is seriously leaked or ruptured
In summary, the above treatment methods:
1. Check and properly connect the high and low pressure pipelines
2. Check and connect the signal line correctly
3. Replace or replace high-pressure side pipelines
Third, the cause of the low indication fault:
1. The pipeline on the high-pressure side is not tight
2. The balance valve is not tight or not closed
3. The air in the high-pressure side pipeline is not discharged
4. Differential pressure gauge or secondary instrument zero offset or displacement
5. The throttling device and differential pressure gauge are not matched and do not meet the design regulations
In summary, the above treatment methods:
1. Check and eliminate leakage of high-pressure side pipelines
2. Inspection, closing or repair of the balance valve
3. The high-pressure side pipeline discharges clean air
4. Check and adjust the differential pressure gauge or secondary instrument
5. Replace the matching differential pressure gauge according to the design regulations
Fourth, indicate the cause of high fault:
1. The pipeline on the low pressure side is not tight
2. Air accumulates in the pipeline on the low-pressure side
3. The pressure of steam is lower than the design value
4. Zero drift of differential pressure gauge
5. The throttling device and differential pressure gauge are not matched and do not meet the design regulations
In summary, the above treatment methods:
1. Check and eliminate leakage low-pressure side pipelines
2. The low-pressure side pipeline discharges clean air
3. Make corrections according to the actual density
4. Check and adjust the differential pressure gauge
5. Replace the matching differential pressure gauge according to regulations
5. Indicate the cause of the failure exceeding the upper limit of the scale:
1. The actual flow exceeds the design value
2. The pipeline on the low pressure side is seriously leaking
3. The signal line is broken
In summary, the above treatment methods:
1. Switch to a differential pressure gauge of the appropriate range
2. The low-pressure side pipeline excludes leakage
3. Check and repair the signal line
6. Indicate the cause of the slow change fault when the flow rate changes:
1. The connecting pipeline and valve are blocked
2. The differential pressure gauge is faulty inside
In summary, the above treatment methods:
1. Flush the pipeline and unclog the valve
2. Check and eliminate the fault of the differential pressure gauge
7. Indicate the cause of large fluctuation failure:
1. The flow parameters themselves fluctuate too much
2. The load measuring element is sensitive to parameter fluctuations
In summary, the above treatment methods:
1. The high and low pressure valves should be closed appropriately
2. Adjust the damping effect appropriately
8. Indicate the cause of the immovable failure:
1. If the antifreeze facility fails, the differential pressure gauge and the pressure guide tube are hydraulically frozen
2. The high and low pressure valve is not opened
In summary, the above treatment methods:
1. The effect of strengthening antifreeze facilities
2. Open the high and low pressure valve