LNG gas-fuel supply system
What is being checked
The inspector is checking whether the LNG gas-fuel supply system matches the approved arrangement, is physically ready, is tested through its complete operating path and is understood by responsible personnel.
Ready onboard
0/6 completePractice questions
Answer aloud, then open the preparation point.
1What is the purpose and operating limit of the LNG gas-fuel supply system?
Explain the protection provided by fuel-gas preparation, compressors or pumps, heaters, double-wall piping, ventilation, gas detection, master gas valve and shutdown logic, including the condition that requires intervention.
2How is the complete operating path tested?
Use the approved safe test method to prove gas detection, ventilation, valve closure, pressure and temperature trips, leak response and changeover to alternative fuel, including the final alarm, trip, movement or indication.
3What happens if the equipment is unavailable?
Notify the Master and terminal as applicable, stop or restrict the affected operation, establish approved compensating controls and obtain repair or formal authority.
4Show the latest maintenance and defect history.
Match the physical identity to PMS, calibration or service records and verify that any temporary control has been closed.
5Which indication proves the equipment is in its safe condition?
Identify the local and remote indication, its source, alarm set point and how a false or frozen signal would be detected.
Where an observation may arise
The fitted system, drawing, manual or certificate did not agree.
Inspection identified gas leakage, failed ventilation, defective detector, valve passing, unsafe pressure, cold spot or incomplete shutdown.
Records did not prove gas detection, ventilation, valve closure, pressure and temperature trips, leak response and changeover to alternative fuel through the complete operating path.
An alarm, trip, interlock or indication was isolated, incorrect, overdue for test or not understood.
PMS, calibration, service or repair evidence was missing, overdue or not traceable to the item.
Responsible personnel could not explain fuel-gas preparation, compressors or pumps, heaters, double-wall piping, ventilation, gas detection, master gas valve and shutdown logic, operating limitations or failure response.
Master's practical note
Trace one signal or flow path from the field device to the CCR or ECR and back to the final protective action. A successful local test alone may not prove the full system.
Equipment boundary and references
Equipment boundary: Use approved test modes and maker instructions. Do not bypass an interlock, release cargo or defeat protection merely to satisfy an inspection demonstration.
References
- OCIMF SIRE 2.0 Question Library Part 2, Version 1.0, Question 8.5.3
- IMO IGC Code Chapter 16
- IMO IGF Code where applicable
Last reviewed: 2026-09-14