Static Equipment Interview Questions -

Q16: How do you prevent hydrogen-induced cracking (HIC) in sour service vessels?

Answer:

Q17: What is the difference between internal pressure design and external pressure (vacuum) design?

Answer:

Q18: What are common failure modes in heat exchanger tubes? static equipment interview questions

Answer:

Q19: What information is on a vessel's nameplate?

Answer (per ASME):

Q20: How do you calculate the minimum required thickness of a cylindrical shell under internal pressure? Q16: How do you prevent hydrogen-induced cracking (HIC)

Answer (per ASME VIII UG-27):

t = (P × R) / (S × E – 0.6 × P)

Where:

The Immediate Action: STOP THE TEST. VENT A BIT. The Reasoning: The "pinging" is likely snap-through buckling of a stiffener ring or a dished head. or it could be inclusion popping (non-dangerous but sounds scary). Safely depressurize, then inspect with UT for buckling. Never continue to 100%. Answer:

Static equipment is not just vessels; heat exchangers are a massive part of the field.

What they’re really checking: Do you understand safety margins and the hierarchy of limits?

Good answer kernel:

Pro insight: If MAWP is exactly design pressure, ask if corrosion allowance was fully consumed. Often a red flag.

Answer: Per API 650, the 1-foot method for low tanks: [ t_d = \frac2.6 \times D \times (H - 1) \times GS_d + CA ] Where D = tank diameter (ft), H = liquid height (ft), G = specific gravity, S_d = allowable stress (psi). For larger tanks, the variable-design-point method is used (multiple courses of varying thickness).