Question 18 TK02 - Tank Vessel Assistant - Liquefied Gas

The Correct Answer is D **Explanation for Option D (150 psi):** The regulations governing cargo transfer hoses used on tank vessels (such as those regulated by the U.S. Coast Guard, specifically found in 33 CFR 154.500) mandate that flexible hoses used for transferring oil or hazardous material must meet specific safety standards. These standards require the hose assembly to have a **minimum bursting pressure of 600 psi** and a **minimum working pressure of 150 psi**. Therefore, the cargo hose must be rated and capable of withstanding a working pressure of at least **150 psi** to ensure safe transfer operations and prevent failure due to pressure surges or standard operational pressures. **Why the other options are incorrect:** * **A) 75 psi:** This pressure is too low for the required safe working pressure of cargo hoses on tank vessels. Using a hose rated only for 75 psi would violate safety regulations and pose a high risk of rupture during transfer operations, which typically exceed this pressure. * **B) 100 psi:** While higher than 75 psi, 100 psi is still below the mandated minimum working pressure of 150 psi required by regulations for oil and hazardous material cargo hoses. * **C) 120 psi:** Similar to the previous options, 120 psi does not meet the regulatory minimum working pressure requirement of 150 psi for cargo transfer hoses on tank vessels.