According to regulations, which choice...

🔍 Key Concepts

• Liquefied gas cargo hose requirements under 46 CFR (Cargo and Bulk Dangerous Cargoes) – verify current section for gas carriers • Difference between working pressure and bursting pressure for cargo hoses • Safety margin typically required between normal operating (working) pressure and the hose’s burst pressure rating

💭 Think About

• First, think about why regulators require a margin between working pressure and bursting pressure. How large would that margin need to be to remain safe under abnormal surges? • Compare each option: which ones are tied to working pressure of the hose itself and which are tied to something else like the cargo pump? Which is more reliable as a design basis? • Ask yourself: for a hazardous cargo like liquefied gas, would the factor of safety be relatively small (like 1.5) or significantly larger? How does that help you narrow the options?

✅ Before You Answer

• Check in 46 CFR gas carrier requirements what multiplying factor is specified between maximum working pressure and bursting pressure for cargo hoses used with liquefied gases • Verify that the requirement is based on the maximum working pressure on the hose during cargo transfer, not just a “minimum” or the pump discharge pressure • Eliminate any options that do not clearly reference both: (1) working pressure of the hose during transfer, and (2) the correct regulatory safety factor

According to regulations, which choice depicts the bursting pressure of a cargo hose used for transferring liquefied gases?

Five times the maximum working pressure on the hose during cargo transfer

Four times the pressure of the cargo pump used for transferring

Five times the minimum working pressure on the hose during cargo transfer

One and a half times the designed working pressure

🔍 Key Concepts

💭 Think About

✅ Before You Answer