Static Equipment | Interview Questions
The first area an interviewer will probe is your knowledge of design codes. Static equipment is highly regulated because failure can be catastrophic.
Common Question: What is the difference between ASME Section VIII Div 1 and Div 2?
How to Answer: You should explain that both govern the design of pressure vessels, but they differ in philosophy. Division 1 uses a "design by rule" approach. It is prescriptive, offering specific formulas for thickness based on a safety factor (historically 3.5 on tensile strength). It is generally easier to apply but results in thicker, heavier vessels.
Division 2, conversely, uses "design by analysis." It requires detailed stress analysis (often using Finite Element Analysis) and rigorous fatigue analysis. Because the analysis is more precise, the safety margins can be tighter, allowing for thinner vessels and material cost savings. However, the engineering and inspection costs are higher.
Common Question: How does API 510 differ from ASME?
How to Answer: This tests your understanding of the lifecycle. ASME codes govern the design and construction of new vessels. API 510 governs the inspection, repair, and alteration of vessels already in service. An inspector uses ASME to understand how the vessel was built, but uses API 510 to determine if it is safe to continue operating.
Answer: TEMA classifies by front head, shell type, and rear head: static equipment interview questions
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For a static equipment engineer interview, questions typically range from core mechanical design principles to specific industry codes like ASME and API. Core Technical Concepts Pressure Vessels & Shell Design
: Expect questions on calculating shell thickness and understanding specific code requirements.
: Which paragraph of the ASME code is used for the design of shell thickness?
: What are the loading conditions defined in UG-22 of the ASME code? Heat Exchangers
: A major part of the role involves specialized heat transfer equipment. The first area an interviewer will probe is
: What is the primary function of a floating head in a shell and tube heat exchanger? (Answer: To allow for movement caused by thermal expansion)
: Explain why an expansion bellow is required in certain heat exchanger designs.
: What are the different types of shell and tube heat exchangers (e.g., fixed-tubesheet vs. floating head)? Flange and Nozzle Design : Precision in connection points is critical for safety.
: Can you explain the procedure for designing a rectangular flange, and why is this typically not handled by standard software? : Explain flange design as per ASME Appendix 2. Stress Analysis : Understanding how equipment reacts to operational forces.
: What is secondary stress, and how does it differ from primary stress? Materials and Manufacturing
Q13: How do you ensure data integrity when converting paper inspection records to CMMS or digital database?
A: Q13: How do you ensure data integrity when
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:
The Expert Differentiator:
Answer: Use API 579 Level 2 or 3:
Q1: What are the key documents you must review before accepting a new static equipment item (e.g., pressure vessel)?
A:
Q2: How do you maintain a pressure vessel history folder?
A:
As per API 510 / ASME PCC-2, a folder should contain:
Q3: What is an MDR (Manufacturing Data Report) and why is it important?
A:
MDR is a compiled record of all fabrication, testing, and inspection documents for a vessel. It’s important for traceability, regulatory compliance, future repairs, and insurance purposes.