Can the 105 nicotinic acid storage tank be made of carbon steel?
Thread Content
Can the 105 nicotinic acid storage tank be made of carbon steel? The design institute specified 316L.
Stainless steel can hold up for a while, while carbon steel is not suitable because free SO3 is highly corrosive to carbon steel. If the acid temperature is below 60 degrees, it is recommended to use tanks lined with plastic, provided that the tank size is not too large. For larger storage capacities, stainless steel is still the better choice
It’s fine to use carbon steel. However, attention must be paid to the design storage capacity, as this relates to the strength and stability of the tank; therefore, the diameter-to-height ratio should be considered, and relevant standards can be referred to.
Reply to 4# yllf289: The niacin tank has a diameter of 11.5 m and a height of 11.55 m; its volume is 1,000 cubic meters. Are there any standards or specifications that can be referred to?
In industry, 105 nicotinic acid is mainly processed using carbon steel; stainless steel is not much better than carbon steel for use in 105. For storage tanks that require attention, if they are not used for an extended period or if the liquid level remains constant, it is possible for a small amount of acid at the gas-liquid interface at that level to absorb moisture and turn into dilute acid, thereby causing corrosion. Additionally, it was mentioned upstairs that steel-lined with plastic should be used. Note that due to the high water absorption and oxidizing properties of 105%, only steel-lined with PTFE can be used; other materials such as PO, PE, PVC, etc., will cause the plastic part to burn.
The material of our 105 acid finished product tank is carbon steel; it has been in use for ten years and is still in good condition
I specifically asked a colleague in the industry today, and he said that the material used for the nicotinic acid storage tank is carbon steel.