). The methane cannot diffuse out, leading to internal micro-voids and decarburization.
Over-rolling has strain-hardened the tube material, or the tubesheet holes are damaged. The Fix:
Pressure vessels are leak-tight containers designed to hold liquids or gases at pressures substantially different from the ambient pressure. static equipment interview questions
Dye Penetrant Testing (PT): Excellent for surface-breaking cracks on non-porous materials.
To protect the equipment from overpressure (exceeding MAWP). It automatically releases fluid when set pressure is reached and reseals when pressure drops to a safe level. The Fix: Pressure vessels are leak-tight containers designed
: Uses air or inert gas. It carries a high risk of explosive failure due to stored compressed gas energy. It is only used when water cannot be tolerated or when structural supports cannot handle the weight of water. Codes and Standards Cheat Sheet
uses a design-by-analysis approach. It allows for higher allowable stress values and a lower factor of safety (typically 3.0), but requires rigorous finite element analysis (FEA) and stricter quality control. It automatically releases fluid when set pressure is
2. Explain the difference between ASME Section VIII Division 1 and Division 2.
SCF is the multiplier of nominal stress due to geometric discontinuities (nozzles, openings, weld toes, shell-to-head junctions). It matters in:
). This creates high internal gas pressure, causing internal blistering and planar cracking.