Liquid ammonia storage tank
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Design temperature: 50 degrees; design pressure: 2.16. Operating temperature: 45 degrees. Do ammonia liquid storage tank forgings require impact testing at -20°? Does the steel pipe need normalizing?
The forgings for liquid ammonia storage tanks are designed for a temperature of 50 degrees, but they are exposed to environments as low as -20 degrees; therefore, an impact test at -20° is required to ensure the safety and stability of the material in low-temperature conditions. Whether steel pipes need to be normalized depends on the specific requirements of the material and the processing conditions. Normalizing can improve the plasticity and toughness of steel pipes; if their mechanical properties do not meet the design and usage requirements, then normalization is necessary. .
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What type of valve should be used for the shut-off valve on the level gauge – carbon steel or stainless steel?
The material selection for the level gauge stop valve depends on the properties of the stored medium and the operating environment. For a medium such as liquid ammonia, it is recommended to use globe valves made of stainless steel, as stainless steel possesses excellent corrosion resistance and higher strength, enabling it to better withstand the corrosive effects of liquid ammonia as well as low-temperature conditions. Although carbon steel has a lower cost, its poor corrosion resistance may make it unsuitable for liquid ammonia storage tank systems. .
Bellows globe valve made of carbon steel; valve body and cover made of ASTM A105; disc made of 2Cr13 + babbitt; bellows made of 304