The standard provides guidelines for several roof profiles based on process needs and vapor containment requirements:
| Feature | EN 14015 | API 650 | | :--- | :--- | :--- | | | European (CEN) | American (API) | | Scope of Application | Site-built, vertical, cylindrical, flat-bottomed, welded steel tanks for liquids at ambient temperature and above. | Welded tanks for oil storage with internal pressure approximating atmospheric pressure. | | Design Philosophy | Historically based on working stress (allowable stress) design. Increasingly moving towards limit state design (Eurocodes). | Primarily based on allowable stress design (Working Stress Design). | | Maximum Allowable Stress | Specifies a hard limit of 260 N/mm², regardless of the steel's ultimate strength. | Allows for higher strength steels, with allowable stress based on a fraction of the yield and tensile strength. | | Calculation Methods | Has its own calculation formulas for thickness and other parameters, which differ in their handling of design liquid level and other factors compared to API 650. | Uses well-established formulas (e.g., the "1-foot method" and "variable design point method") for calculating shell thickness. | | Pressure Allowance | Provides specific limits for internal (60 mbar) and negative pressure (-6.0 mbar). | Defines a "low-pressure" category for tanks with a higher design pressure than normal atmospheric tanks. | | Maximum Pressure | The standard has strict design pressure and vacuum limits. | Generally considered to have a higher maximum allowable working pressure for a given tank diameter. | En 14015 Pdf
When searching for "EN 14015 PDF," engineers and project managers must ensure they obtain an authorized, up-to-date copy. Using bootlegged or outdated versions can lead to catastrophic design errors and compliance failures. The standard provides guidelines for several roof profiles
The EN 14015 PDF standard applies to the design and fabrication of tanks used for storing oil and gas products, including: Increasingly moving towards limit state design (Eurocodes)