Seeking advice on some issues related to liquid ammonia storage tanks
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I need to design an outdoor liquid ammonia storage tank; in winter, its outer wall needs to be heated by semi-gas steam. How should this be designed, and what considerations are necessary? This type of tank would likely fall into category 2. What material is suitable for the connecting pipes? Can seamless steel pipes be used? Please help!
It’s impossible to determine which category the conditions fall into; it would be best to explain them more clearly
The last edit to this post was made by prt0683 on 2010-3-24 at 10:20; it is sufficient to use carbon steel for the pipeline as long as it can withstand low temperatures
For liquid ammonia corrosion, the material must be normalized steel plate.
For a horizontally installed liquid ammonia storage tank with a design pressure of 2.16, a design temperature of 50, a diameter of 1500, and a length of 5000, what material would be suitable for its nozzles?
Ordinary pipes will do; what’s important now is to meet the reinforcement requirements. If the pipes are too thick, then reinforcement pipes need to be considered. Although it is Category II, the use of reinforcement rings is still not recommended.
For an outdoor liquid ammonia storage tank with a design pressure of 2.16, a design temperature of 50, a diameter of 1500, and a length of 5000, the wall thickness is approximately 24–26 mm; 20-mm seamless steel pipes can be used for this purpose.
Grade 20 pipe (normalized) in accordance with GB9948 standard
There is already a major premise for determining the design conditions: it involves the use of liquid ammonia. Currently, another factor related to material selection is the ambient temperature; when choosing materials, attention must be paid to the issue of stress corrosion caused by liquid ammonia. The necessity of heating in winter still needs further evaluation
Category 2: the main material is Q345R; for the connecting pipes, reinforced short-section forgings are used, while the outer insulation sleeves can be ordinary ones or coiled types