What is a common feature of vessels designed to withstand external pressure?

In the context of pressure vessels designed to withstand external pressure, being jacketed is a common feature. A jacketed design typically consists of an outer shell that provides additional structural integrity and support to the vessel, allowing it to resist external forces and pressures that might otherwise cause deformation or failure. This design helps to distribute the external pressure more evenly across the surface of the vessel, minimizing the risk of buckling or collapse.

Jacketed vessels often have a space between the inner and outer shell, which can be used for various purposes such as insulation or flow of heating or cooling fluids. This configuration enhances the overall robustness of the vessel, making it suitable for applications where external pressures are significant.

The other options do not address the specific need for external pressure resistance. Insulated vessels focus on thermal management; reinforced vessels may contribute to strength but do not specifically indicate a design for withstanding external pressure; and expandable vessels are generally designed for capacity changes rather than for pressure resistance.