【Q&A Question 044】2016.06.03
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【Q&A Question 044】June 3, 2016: How to determine the flushing program control valve with internal leakage in the diesel hydrogenation feed filter? The answer key will be available after responding; scoring is based on answering the key points. 1. Monitor the trend in the liquid level of the backwash sludge tank; when the filter is not being backwashed, an increase in the liquid level indicates a leak in the filter’s drain valve. 2. Confirm that the filter has just undergone a backwash and that its pressure difference is low; switch the filtering operation to manual mode on-site to prevent the program from running automatically during the inspection. 3. Start by gradually closing the manual valves for the waste water pipelines in each column, beginning with the first column. The operator on duty should monitor the level of oil in the backwash tank; if the level continues to rise, open the waste water valve and close the manual valve for the next column, repeating this process until the operator notices that the level is no longer rising or is rising very slowly. Record which column this is, then open the waste water valve ； 4. Confirm that more than 2 hours have passed since the automatic backwashing of the filters was completed; use a temperature gun to check the temperature at the outlet of the drain valve for each filter, and record the one or more filters with the highest temperatures ； 5. Once the inspection is complete, the on-site filter flushing will be switched to automatic mode.
Periodic pressure fluctuations, significant changes in flushing components
The liquid level in the vent tank continues to rise, the flow rate into the plant increases, while the liquid level in the raw material tank decreases
After the flushing programmable valve is closed, 1. Determine by listening for the sound of fluid flowing； 2. Check the rate of temperature drop behind the valve
1. Monitor the trend in the liquid level of the backwash sludge tank; when the filter is not being backwashed, an increase in the liquid level indicates a leak in the filter’s drain valve. 2. Confirm that the filter has just undergone a backwash and that its pressure difference is low; switch the filtering operation to manual mode on-site to prevent the program from running automatically during the inspection. 3. Start by gradually closing the manual valves for the waste water pipelines in each column, beginning with the first column. The operator on duty should monitor the level of oil in the backwash tank; if the level continues to rise, open the waste water valve and close the manual valve for the next column, repeating this process until the operator notices that the level is no longer rising or is rising very slowly. Record which column this is, then open the waste water valve ； 4. Confirm that more than 2 hours have passed since the automatic backwashing of the filters was completed; use a temperature gun to check the temperature at the outlet of the drain valve for each filter, and record the one or more filters with the highest temperatures ； 5. Once the inspection is complete, the on-site filter flushing will be switched to automatic mode.
This post was last edited by wangld on 2016-6-3 at 16:59. 1. Monitor the trend in the liquid level of the backwash oil tank; when the filter is not being backwashed, an increase in the liquid level indicates that there is a leak in the filter’s drain valve. 2. Confirm that the filter has just undergone a backwash and that its pressure difference is low; switch the filtering operation to manual mode on-site to prevent the program from running automatically during the inspection.
The liquid level in the connected oil tank keeps rising; it can be inferred that there is temperature in the pipeline, as the feed material passes through a preheater first
Is the liquid level in the backwash oil tank continuing to rise?