【Q&A Question 090】March 31, 2017
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This post was last edited by 955559 on 2017-7-21 22:26. [Q&A Question No. 090] How to determine whether the primary seal of a dry gas seal is leaking? 2017.03.31 The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 1. Under the same differential pressure, the discharge volume of the primary dry gas seal increases. 2. Reducing the secondary sealing gas flow results in a minimal decrease in the amount of gas vented through the flare. 3. The pressure in the sealed flare stack is rising. 4. Verify that the flare flow meter is in good condition. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Third Phase of HaiChuan’s Outstanding Management Members Selection Contest http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
1. Under the same differential pressure, the discharge volume of the primary dry gas seal increases； 2. Reduce the flow of the secondary sealing gas; the amount of gas discharged through the flare does not decrease significantly ； 3. Rise in pressure in the sealed flare stack ； 4. Confirm that the flare flow meter is in good condition.
The air leakage increases, or the amount of sealing buffer air increases
1. Under the same differential pressure, the discharge volume of the primary dry gas seal increases； 2. Reduce the flow of the secondary sealing gas; the amount of gas vented through the flare does not decrease significantly ； 3. Rising pressure in the sealed flare vent ； 4. Confirm that the flare flow meter is in good condition.
1. Under the same differential pressure, the discharge volume from the primary dry gas seal increases; 2. Reducing the pressure of the secondary sealing gas results in only a minor decrease in the amount discharged to the flare; 3. The pressure of the gas discharged to the flare increases; 4. Verify that the flow meter for the gas discharged to the flare is functioning properly.
Judgment is made based on the leak gas pressure and leak gas flow rate
If the amount of sealing gas is significantly higher or lower than normal without any process-related or human-induced interference, it can be used to determine whether it has failed； Furthermore, leaks of the medium sealed by the dry gas seal can also be used as a basis for judgment ； Failure determination can also be carried out by comparing other operating parameters of the driven equipment
Check whether the temperature of the exhaust gas recovery line is rising
Emission or pressure increase of the secondary seal