What is the primary factor considered in determining the minimum thickness for shell plates?

• A. The lesser of values computed
• B. The greater of values computed
• C. Average thickness of available materials
• D. Manufacturer recommendations

Answer: (B)

The primary factor in determining the minimum thickness for shell plates is the greater of values computed. This is because the design must ensure that the tank can adequately withstand internal pressures, external forces, and environmental conditions without compromising structural integrity.

When calculating the minimum thickness, engineers typically derive multiple values based on various design conditions, including bending, buckling, and corrosion allowances. By selecting the greater of these values, they ensure that the design accounts for the worst-case scenarios, thus enhancing safety and performance. This approach is critical for maintaining the reliability and durability of the tank over its lifecycle.

Considering average thickness of materials or manufacturer recommendations may not align with the specific engineering criteria necessary for a robust and code-compliant design. Therefore, ensuring that the chosen thickness is the greater computed value is fundamental for effective and safe tank construction.