Читать книгу Fabrication of Metallic Pressure Vessels - Maan H. Jawad - Страница 19

Cost reduction by minimizing material cost is represented by a situation in which two different metal alloys of different costs (per unit weight) result in the same wall thickness. This occurs when either the wall is fixed (for example, when a minimum wall is required for handling or for stiffness reasons), or when rounding from the required minimum wall to the next stock thickness results in the same fabricated thickness for both. If there is no other operational reason to use a more expensive material (SA 516‐70, for example, rather than SA‐36), then the obvious choice is a less expensive one.