Reference API 510. You would calculate the remaining life using the formula involving design pressure, current thickness, and corrosion rate. You might also mention "Fitness-For-Service" (API 579), which allows engineers to determine if a flaw is acceptable to remain in service or if it requires repair, rather than simply condemning the equipment.
3. What is Joint Efficiency (E) and how does it impact vessel design? static equipment interview questions
Tubesheets are welded directly to the shell. It is cost-effective and prevents inter-fluid leakage, but cannot accommodate significant differential thermal expansion unless an expansion joint is installed. Tubes cannot be mechanically cleaned on the outside (shell side). Reference API 510