Design of vinyl chloride monomer storage tank

If only the effect of ambient temperature causing the equipment to cool down is considered, add insulation; in that case, normal-temperature materials can be used.

I don’t know the specific working process or the operating temperature; I also don’t know whether it is a container designed for storage at room temperature. If it is such a container, then a design temperature of 80 is not appropriate. Vinyl chloride should be classified as a liquefied gas. According to the handbook of basic data on petrochemicals, its saturated vapor pressure at 80 degrees is 14.77 atmospheres, or approximately 1.38 MPa; therefore, a design pressure of 1.38 MPa is sufficient. According to the design parameters specified by the poster, this equipment belongs to Category III containers; if a design pressure of 1.38 MPa is used, it falls into Category II. The required wall thickness in that case is around ten millimeters. The medium can be considered to pose a moderate level of hazard, and there is no risk of stress corrosion, so post-weld heat treatment is not necessary. I have no idea what the so-called ambient temperature is; the minimum design temperature should be determined based on the lowest average monthly temperature as well as whether the equipment has insulation or not. All operating parameters must be accurate in order for the design parameters to be accurate; otherwise, the cost of the equipment will **increase**. Even if it’s just a small exercise, one must have a clear understanding of the concepts.