Cargo-tank venting isolation
What is being checked
The inspector is checking whether cargo-tank isolation from the common venting 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 cargo-tank isolation from the common venting system?
Explain the protection provided by approved spectacle blanks, spool pieces or equivalent positive isolation, normal venting path and visible position control, including the condition that requires intervention.
2How is the complete operating path tested?
Use the approved safe test method to prove physical isolation, correct reconnection, leak tightness and unobstructed pressure or vacuum relief, 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 wrong blank position, undocumented isolation, leakage, obstructed venting or a tank left without effective relief.
Records did not prove physical isolation, correct reconnection, leak tightness and unobstructed pressure or vacuum relief 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 approved spectacle blanks, spool pieces or equivalent positive isolation, normal venting path and visible position control, 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: A cargo tank must never be isolated from all effective pressure and vacuum protection. Follow the approved venting drawing and cargo plan.
References
- OCIMF SIRE 2.0 Question Library Part 2, Version 1.0, Question 8.1.3
- SOLAS Chapter II-2 regulation 4.5.3
- OCIMF ISGOTT, Sixth Edition
Last reviewed: 2026-09-14