LNG Terminal Boil-Off Gas Control Engineer Interview Questions
Practise answering 5 interview questions for LNG Terminal Boil-Off Gas Control Engineer roles. Covers explaining tank-pressure transmitter recalibration flags, single-tank gas-analyzer disagreement root-cause analysis, hardwired emergency-shutdown vs. software compressor-control trade-offs, and shutdown judgment.
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1 / 5
The interviewer asks: "How would you explain to a terminal operations manager why the boil-off gas control system just flagged the tank pressure transmitter for recalibration even though the current tank-pressure readings look perfectly normal?" Which answer best demonstrates clear communication?
Option B explains that condensation gradually damping the impulse line’s response can leave pressure readings looking normal even though the transmitter’s ability to catch a genuine pressure excursion is degrading, which is why the system flags it early. The other options claim false certainty or misstate what the system evaluates.
2 / 5
The interviewer asks: "After a software update to the terminal’s boil-off compressor controller, one storage tank started disagreeing with the portable gas-composition analyzer, while every other tank at the terminal remained accurate. How do you investigate?" Which answer shows the most rigorous diagnostic thinking?
Option B checks what is different about the affected tank’s sensor configuration, reviews the update’s changelog, and compares raw pressure signal against calculated boil-off rate to localize the fault. The other options jump to a hardware replacement, dismiss the portable analyzer outright, or wrongly rule out the update.
3 / 5
The interviewer asks: "What is the difference between the hardwired high-high tank-pressure relief and emergency shutdown system and the software-based boil-off compressor control loop, and how do they work together?" Which answer is most technically precise?
Option B correctly separates the hardwired, safety-critical emergency shutdown system from the software control loop’s more nuanced but software-dependent recovery optimization. The other options invert the two mechanisms or invent a tank-size restriction that does not exist.
4 / 5
The interviewer asks: "How do you decide whether an anomalous boil-off rate reading should trigger an automatic emergency shutdown versus letting the operator investigate before continuing normal send-out?" Which answer best demonstrates sound engineering judgment?
Option B treats any emergency shutdown switch indication as a non-negotiable shutdown, and otherwise weighs divergence from the design-pressure tolerance and portable-analyzer corroboration before recommending a shutdown versus a spot-check. The other options ignore the real trade-off or wrongly treat gas volume as decisive.
5 / 5
The interviewer asks: "Tell me about a time your terminal’s tank pressure transmitter reading disagreed noticeably with the portable gas-composition analyzer. What was the outcome?" Which answer best follows a structured STAR approach with concrete detail?
Option B identifies a plausible root cause, condensation in the impulse line damping the transmitter’s response and masking a real excursion, verifies it against the portable analyzer and purge maintenance history, and delivers a validated finding plus a preventive recommendation. The other options are vague or lack technical specificity.