How to inspect the outlet pipeline of the ammonia synthesis tower?
Thread Content
Following the explosion caused by the rupture of the outlet pipeline of the ammonia synthesis tower at Yuntianhua on March 23, the reason for the rupture of that pipeline remains unknown. However, in actual production, there is a high likelihood of hydrogen corrosion occurring in this pipeline. Here, I would like everyone to discuss whether it is possible to detect hydrogen corrosion in such pipes (such as hydrogen embrittlement), if it occurs Which method is more scientific, reasonable, and accurate for testing? To prevent similar accidents from occurring again, please actively participate in the discussions and share your relevant experiences without reservation; this is also a way to contribute to the development of China’s fertilizer industry!
Hydrogen embrittlement is one of the reasons. Also, could it be that the wrong material was used? Or is there a manufacturing defect? Accidents can also occur due to significant fluctuations in pressure and temperature. It is safe to use an instrument to test the material before installation.
We use magnetic particle testing to check for cracks during major overhauls, and we do this every year.
In the standard section of the forum, there is a standard for steels used in high-temperature and high-pressure hydrogen-related operations in API-941 refineries and petrochemical plants; it is very useful as a reference for such issues. The address is: http://bbs.hcbbs.com/viewthread.php?tid=325754&highlight=API – you should take a look.
We have three towers connected in series; it’s too troublesome to check them all. I don’t know what to do
The temperature of that pipe is also high, and thermal stress is one of the causes of the explosion.
We had problems; the cracks have penetrated all the way through. The TOFD method is now used for flaw detection. That is, 3D ultrasonic testing can detect not only circumferential cracks but also axial cracks very effectively.
The testing methods on the 3rd floor are incomplete; magnetic testing can only indicate that there are no issues with the surface and near-surface areas, but since the pipe thickness is around 45 mm, radiographic or ultrasonic testing is necessary to conduct an effective inspection. Otherwise, it’s just comfort for the mind.