Which jacketing finish is NOT commonly used for the jacketing in large diameter vessels?

• A. 1 1/4" corrugated
• B. Smooth finish
• C. Ribbed
• D. Brushed

Answer: (A)

The finish not commonly used for large-diameter vessel jacketing is the corrugated option. In large vessels, you want a jacket that can be sealed cleanly, resist weather, and be installed without excessive complexity. A corrugated surface with large ridges adds many seams and crevices, making it hard to seal watertight around a big circumference and easy for moisture, dirt, and corrosion to accumulate. It also increases weight and fabrication effort, driving up cost and complicating field installation. By contrast, a smooth finish is straightforward to seal and keep clean, a ribbed finish provides extra rigidity to resist denting and flexing, and a brushed finish offers a uniform look with easier maintenance. For these practical reasons, corrugated jacketing isn’t common on large-diameter vessels.