What is the maximum allowable pressure in a cargo tank during the loading operation?

The maximum allowable pressure in a cargo tank during the loading operation is set for safety reasons, ensuring the structural integrity of the tank and the safe handling of the cargo. A pressure of 1.0 psi is often established as the acceptable limit for tankers when loading. This level balances the need to safely accommodate the natural rise in pressure that occurs as the tank fills with liquid.

Higher pressures can lead to potential hazards, such as tank rupture or release of cargo vapors, which poses risks not only to the tanker and crew but also to the environment. Furthermore, maintaining pressure within this limit helps to ensure that safety systems, such as relief valves, function effectively without triggering or leading to unintentional release.

While the other options reflect different pressure thresholds, they exceed the generally accepted maximum for loading operations. Understanding the rationale behind the 1.0 psi limit underscores its importance in maritime safety practices regarding tanker operations.