Static Equipment Interview Questions -
Answer:
Q13: How do you ensure data integrity when converting paper inspection records to CMMS or digital database?
A:
Q14: What is a “red-line” drawing and why keep it?
A:
A drawing marked with as-built changes not captured in original. Kept to:
Interviewers will test your ability to visualize and calculate mechanical requirements. static equipment interview questions
Common Question: What is the difference between a Seamless and a Welded pipe, and where would you use them?
How to Answer: Seamless pipe is extruded and has no longitudinal seam. It is generally stronger and preferred for high-pressure and high-temperature applications. Welded pipe (ERW or LSAW) is cheaper and available in larger sizes, but the weld seam is a potential point of failure. You would use welded pipe for low-pressure water lines or structural applications, and seamless for critical process lines.
Common Question: What is the difference between a 2:1 Ellipsoidal head and a Torispherical head? Answer:
How to Answer: This reveals your knowledge of pressure vessel geometry. A 2:1 Ellipsoidal head is deeper and has a smooth transition from the shell, creating better stress distribution. It is standard for high-pressure vessels. A Torispherical head (often called a "dished head") has a crown radius and a knuckle radius. It is shallower, easier to manufacture, and cheaper, but the knuckle area experiences higher stress. Therefore, torispherical heads are used for lower pressures or storage tanks.
Since static equipment sits in one place for decades, material degradation is the primary enemy.
Common Question: What are the different types of corrosion, and how do you mitigate them? Q13: How do you ensure data integrity when
How to Answer: You must move beyond general rust. Discuss specific mechanisms:
Common Question: What is PWHT and why is it required?
How to Answer: PWHT stands for Post-Weld Heat Treatment. It is a process of heating the welded metal to a specific temperature and holding it there, then cooling it slowly. It relieves residual stresses created by the intense heat of welding. It is critical for materials like Carbon Steel above a certain thickness (usually >32mm) or alloy steels, as it reduces the risk of brittle fracture and environmental cracking.
Answer: 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:
Answer: TEMA classifies by front head, shell type, and rear head:
