What must be checked before determining the minimum thickness of shell plates?

• A. Previous inspection reports
• B. Material specifications
• C. Nominal Tank Diameter - Nominal Plate Thickness table
• D. Welding procedure qualifications

Answer: (C)

To determine the minimum thickness of shell plates in accordance with API 650, it is vital to refer to the Nominal Tank Diameter - Nominal Plate Thickness table. This table provides essential guidelines for selecting the appropriate thickness based on the tank's diameter, ensuring that the tank can safely accommodate the intended service conditions. The specifications in this table are established based on design, safety factors, and operational requirements, ensuring the structural integrity and performance of the tank.

Utilizing the nominal thickness recommendations allows engineers and designers to align their choices with industry standards and best practices, reducing risks associated with substandard materials or dimensions. By prioritizing this table, one can ensure compliance with regulations and promote the longevity and reliability of the tank design.