On the liquid ammonia pipes, using flanges and gaskets
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I remember that there are specifications requiring that the gaskets on the flanges of liquid ammonia pipelines should be wound gaskets; I just can’t recall which specification it is. Does anyone remember it and where it can be found? Thank you!
In our facility, welding is used as much as possible for liquid ammonia pipelines in order to reduce the number of leakage points. The flanges are indeed all covered with gasketing. I’m not sure if there are any specific standards. Learn together*.
It was later found that according to clause 6.3.16 of the Petrochemical Regulations regarding storage and transportation, the requirements applied to liquefied hydrocarbons also apply to liquid ammonia!
The flange grades used in liquid ammonia pipelines are PN40 or 300Lb, and the gaskets used accordingly are mostly wound gaskets.