What is the best sealing method for the large and small covers of an ammonia synthesis tower?
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Our company’s ammonia synthesis tower uses a biconical seal for the large cover; aluminum gaskets work fairly well in this case. However, the small cover employs lens-shaped gaskets made of stainless steel, and the sealing performance is poor, leading to frequent leaks and fires. What is the best sealing method for both the large and small covers of an ammonia synthesis tower? We would appreciate expert advice. Thank you!
Octagonal gasket, suitable for high-pressure and high-temperature media
There are limitations on the diameter of lens gaskets, and this is of course related to the quality of installation and manufacturing as well. Under normal maintenance conditions, it is recommended to use toothed flat gaskets in combination with hard aluminum, or double-cone gaskets together with hard aluminum. Our company replaced the lens gaskets on the large cover of the stripping tower in Snam devices with toothed gaskets, and they have been functioning well to this day; of course, careful calculations were carried out before making this change.
For the small cover of the synthesis tower, aluminum gaskets can also be used depending on the circumstances, but attention should be paid to the composition and rebound value
Lids with lens gaskets are not commonly used for sealing; an aluminum flat gasket is sufficient, preventing leaks.