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A subsurface failure in the base metal (usually thick plates) caused by shrinkage stresses from a weld pulling perpendicular to the plate's thickness. Prevention:
Per ASME Sec. VIII Div.2, Part 5 (Design-by-Analysis):
Compare the new thickness against baseline data to calculate the active corrosion rate. static equipment interview questions
Div 1 is rules-based; Div 2 is analysis-based.
Static equipment refers to process equipment with no moving parts. They operate under pressure/vacuum and are stationary. Examples: Pressure vessels, storage tanks, heat exchangers, columns (distillation towers), reactors, boilers, and piping. A subsurface failure in the base metal (usually
The selection of a vessel head depends on operating pressure, cost, and space limitations:
PWHT involves heating the welded component to a specific temperature (typically 1100–1200°F for carbon steel) and controlled cooling. It relieves residual stresses and improves toughness. Mandatory in ASME Sec. VIII: Div 1 is rules-based; Div 2 is analysis-based
), generating high internal pressure that creates blister-like cracks parallel to the rolling direction of the steel plate.
for storage tanks is a standard requirement for these roles. Mechanical Integrity
Mastering a static equipment interview requires a deep understanding of mechanical design, industry codes, and the physical principles that keep industrial plants running safely. Static equipment refers to stationary machinery with no moving parts during operation, such as pressure vessels, heat exchangers, and storage tanks.
