"What is the most common corrosion mechanism you fight in this facility? HIC, Chloride SCC, or High-Temperature Sulfidation?"
Governs large, welded, field-assembled storage tanks operating at pressures up to 15 psi (103.4 kPa). They are designed to store hazardous or volatile liquids that evaporate easily at ambient temperatures.
ASME Section VIII Division 1 (Design by Formula) & Division 2 (Design by Analysis).
It protects against uniform, general corrosion — not pitting, not stress corrosion cracking, not erosion. And it assumes corrosion happens evenly over design life. If you get localized attack, corrosion allowance is useless. static equipment interview questions
Uses a "design by analysis" approach, allowing for thinner wall thicknesses by employing advanced stress analysis methods. It offers higher efficiency but requires more rigorous design and inspection. 4. What is Joint Efficiency (E)? Joint efficiency is a factor (ranging from
When answering questions, adopt a mindset of safety and reliability. If you don't know a specific answer, explain your logic. For example, if asked about a specific material property, discuss how you would look it up in the ASME Section II tables. This shows resourcefulness—a trait highly valued in engineering. By mastering the interplay between design codes and degradation mechanisms, you will position yourself as a competent and reliable engineer.
14. What are the key considerations for "Green" or sustainable design in static equipment? "What is the most common corrosion mechanism you
Yes, but rarely. Flat heads are inefficient — very thick, heavy, expensive. They’re used when:
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Higher engineering cost; lower material cost for high-pressure applications. Generally used up to 3,000 psi. Can be used for much higher pressures. Pressure Vessel Design & Components ASME Section VIII Division 1 (Design by Formula)
The Expectation: Systematic troubleshooting, not just "clean the tubes." Model Answer: "1. Process data: Is the flow rate of hydrocarbon too high (need more residence time)? 2. Cooling water side: Is the inlet water temperature too high? Is the flow rate low? Is there a blockage in the strainer? 3. Fouling: Has the U value dropped? Check pressure drop across the exchanger. A high drop suggests fouling. A low drop suggests bypassing. 4. Cross-contamination: Are we losing cooling water? Check the outlet hydrocarbon for water content (if condensation occurs) or check the cooling water return for hydrocarbon sheen (tube leak). 5. Air binding: Is there air trapped in the water side dome preventing contact?"
Extra material thickness added to the structural design thickness to compensate for metal loss expected during the equipment's operational lifespan.
The Expectation: Fitness-for-Service (FFS) – API 579. Model Answer: "First, I would measure the actual depth of the gouge with a pit gauge or UT (Ultrasonic Testing). Then, I would classify it. If it's in a low-stress area, the remaining thickness might still exceed the required thickness from the original calculations. If it is critical, I would perform a Level 1 or Level 2 FFS assessment per API 579 . I would calculate the remaining ligament efficiency and compare MAWP to the operating pressure. Often, grinding the gouge smooth to remove stress risers (sharp corners) and running a calculation is acceptable without welding."