【Q&A Question 234】2017.08.22
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【Q&A Question 234】August 22, 2017: How to determine if there is a leak in the compressor’s air valves? The reference answer can be seen after responding; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) (1). Temperature: If the inlet valve leaks, the inlet temperature rises; this can be felt by touching it. If the outlet valve leaks, the outlet temperature rises, and this can be measured with a thermometer. (2). Pressure: If the inlet or outlet valves leak, the pressure in the upstream section increases. (3). Noise: Leaks in the valves produce a hissing sound, which can be detected using a listening rod. Scoring criteria: Incorrect answers result in 2 wealth points; incomplete answers earn 3–8 points. Correct answers with detailed explanations grant 10 wealth points, while correct answers with additional supplementary information yield 15–20 wealth points. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be given points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming. Points will start to be deducted after three warnings. 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 Petrochemical Sector – “Creative Ideas for Energy Savings” Campaign (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
1. It is possible to hear sounds; an abnormal noise will occur when there is a leak in the air valve. 2. When the air valve leaks, it causes changes in the pressure at the stage above or below it. 3. The temperature of the valve gland increases.
(1). Temperature: If the inlet valve leaks, the inlet temperature rises; this can be felt by hand. If the outlet valve leaks, the outlet temperature rises, and this can be measured with a thermometer. (2). Pressure: If the inlet or outlet valves leak, the pressure in the upstream section increases. (3). Noise: Leaks in the valves produce a hissing sound, which can be detected using a listening rod.
(1). Temperature: If the inlet valve leaks, the inlet temperature rises; this can be felt by hand. If the outlet valve leaks, the outlet temperature rises, and this can be measured with a thermometer. (2). Pressure: If the inlet or outlet valves leak, the pressure in the upstream section increases. (3). Noise: Leaks in the valves produce a hissing sound, which can be detected using a listening rod.
1. It is possible to hear sounds; an abnormal noise will occur when there is a leak in the air valve. 2. When the air valve leaks, it causes changes in the pressure at the stage above or below it. 3. The temperature of the valve gland increases.
1. It is possible to hear sounds; an abnormal noise will occur when there is a leak in the air valve. 2. When the air valve leaks, it causes changes in the pressure at the stage above or below it. 3. The temperature of the valve gland increases. It can be determined based on the valve seat temperature; if the temperature is high (significantly higher than the intake air temperature), it indicates that the gas valve is leaking. Based on pressure assessment, if the pressure at the previous stage increases slightly, it indicates that the air valve is leak-free.
1. It is possible to hear sounds; an abnormal noise will occur when there is a leak in the air valve. 2. When the air valve leaks, it causes changes in the pressure at the stage above or below it. 3. The temperature of the valve gland increases.
It is determined based on exhaust temperature, exhaust pressure, the temperature rise of individual valves, and exhaust flow rate
1. It is possible to listen for sounds using a listening rod; an abnormal noise will be heard when there is a leak in the air valve. 2. When an air valve leaks, it causes changes in the pressure at the stage above or below it. 3. The temperature of the valve gland increases.
When the gas valve is damaged and allows air leakage, it is first necessary to determine whether it is the high-pressure cylinder or the low-pressure cylinder; the basis for this determination is the pressure in the intercooler. When the inlet valve is opened wide and the clearance valve is closed, the pressure in the intercooler decreases, indicating that there is a leak in the valves of the low-pressure cylinder. This is because the amount of air pumped into the high-pressure cylinder remains unchanged, while the amount of air pumped into the low-pressure cylinder decreases. Conversely, when the pressure in the intercooler increases, it indicates a leak in the air valves of the high-pressure cylinder. Then determine which air valve is leaking. If the set screw and valve cover of the inlet valve become hot, it indicates that the gas inside the cylinder is leaking back into the inlet. Additionally, it can also be judged based on the sound. For the exhaust valve, since the temperature is quite high, it can only be shut off by sound.