Seeking advice on material selection for liquid ammonia storage tanks
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1 states that the liquid ammonia storage tank is a low-temperature vessel, and its design pressure is set at 2.16 MPa in accordance with SH3074. Regarding the material selection, I originally remembered that Q245R was used; I really don’t understand why 16MnDR steel plates are being considered now. I’m seeking advice
Low temperatures aren’t necessary, right? An ordinary normalized plate will do. .
Liquid ammonia leaks at atmospheric pressure at a low vaporization temperature; materials are selected based on this temperature.
For liquid ammonia stored at room temperature at 2.16 MPa, Q345R is sufficient. As for automatic refrigeration using liquid ammonia, it relies on automatic control and monitoring, rather than the choice of materials. The design takes normal operating conditions into account.
These days, Q245R is generally chosen.
A complete resolution of this issue requires a thorough understanding of the entire process within the storage tank as well as various operating conditions (start-up and shutdown, accidents, etc.)
We also need to consider possible accident scenarios