Which code section pertains to the design of pressure vessels?

The design of pressure vessels is specifically governed by the ASME Boiler and Pressure Vessel Code, particularly Section VIII. This section outlines the requirements for the design, materials, fabrication, examination, testing, and certification of pressure vessels. It provides a comprehensive framework to ensure safety and reliability in various applications, whether they are for industrial, commercial, or residential purposes.

In contrast, the other options focus on different aspects of piping systems. For instance, B31.2 deals with the design of flammable and combustible liquids piping, B31.9 pertains to the design and construction of building services piping systems, and B31.5 covers refrigerating piping systems. Each of these codes has its specific applications and safety considerations, but none address the overarching design principles for pressure vessels as directly as ASME VIII.