I have a question regarding problems with the pressure reduction device
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In the 500 million capacity atmospheric and vacuum distillation unit, a leak in the vacuum system is suspected; the vacuum extraction system consists of a booster, a primary evacuator, and a vacuum pump, enabling the tower top pressure to be reduced to 0.5 KPa (absolute pressure). Tests revealed that the degasified gas contained 18–20% (V/V) oxygen and 68–75% nitrogen, indicating the intrusion of air. During the operation, the pressure at the top of the tower was normal with no fluctuations observed. The tower wall flanges and manholes were inspected, and no abnormal noises were heard. After separately removing the air cooling system from the top plate of the tower, a gas analysis was conducted to detect any leaks, but no leaks were found. I would like to ask what the inspection methods for pressure relief systems are, and what suggestions you have.
Report: lol :lol :lol :lol :lol
Generally, leak testing of containers and equipment is carried out under positive pressure. As for my personal opinion, it’s possible to test for leaks in sections of the device, checking each section one by one :)
It’s not that great, right? It contains 18–20% oxygen (V/V). Boss, the oxygen content in the air is only 21% – think about it; a lot of air gets into your pressure relief towers, so how can operations proceed normally? Ask if your oxygen level tests are accurate Has the key sampling been completed? If the oxygen content truly reaches 18–20% (V/V) (under production conditions), the sound of the incoming air will be very loud. I can’t really say what the reason is, but once you find out, let me know!
The number of sampling attempts has exceeded 20, and both analysis instruments show high readings; it’s difficult to suspect an issue with the testing process. Now we have to carry out positive pressure tests. It’s already the fourth day, and it’s frustrating – we still can’t locate the leak.
The number of sampling attempts has exceeded 20, and both analysis instruments show high readings; it’s difficult to suspect an issue with the testing process. Now we have to carry out positive pressure tests. It’s already the fourth day, and it’s frustrating – we still can’t locate the leak.
It shouldn’t be a leakage issue! Your sample is completely just air. Check whether there are issues with the sampling method and tools!
The tower top uses plate-type wet air cooling, which turns out to be not very effective; there are suspicions of leaks. It’s impossible to carry out repairs while the system is in operation, and the lead time for ordering replacement parts is long, making it unsuitable for use in the petrochemical industry.
Just a reminder: is there any leakage in the pipeline connecting it?/
Currently, leaks in the plate-type wet air coolers are being checked; it’s not just one unit. The manufacturer’s staff has arrived at the site to investigate, and after removing 2 units, the oxygen level decreased.
No abnormal noises were heard in the connection pipeline. After shutting down the pipeline pump and fans of the plate-type air cooler and performing a positive-pressure nitrogen filling test, leakage noises could be heard. The key issue is that the leakage points are located in the middle of the plate exchanger, making it impossible to ensure airtightness. In the case of one unit with significant leakage, an airflow escaping could be felt, while for the others, only leakage noises could be heard.