I would like to ask my colleagues: did your company conduct ammonia leak checks during the maintenance of the high-pressure equipment in its urea production facility? If an ammonia leak test was not performed...
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I would like to ask my colleagues: did your company conduct ammonia leak checks during the maintenance of the high-pressure equipment in its urea production facility? If ammonia leak testing is not performed, what method is used to detect leaks in the equipment?
Ammonia penetration testing is recommended for urea high-pressure equipment during maintenance; currently, it seems to be the most commonly used method for detecting leaks in such equipment.
The instrument air coming out of the equipment leak detection tube should be introduced into an absorption tube filled with 0.01 mol/L sulfuric acid solution spiked with methyl red, while the exhaust gas is released into the atmosphere. If the reagent turns yellow, it indicates that ammonia has entered, meaning there is a leak in the equipment.
I actually think that since no leaks were detected even with such a high pressure difference during the device’s production process, then ammonia leak testing during maintenance will also not reveal any issues. Therefore, I believe that if no welding or repairs were carried out during equipment maintenance, there is no need to conduct ammonia leak testing.