Which of the following applies to cargo tank...

🔍 Key Concepts

• Cargo tank safety/relief valves on tank vessels and their normal method of remaining closed until needed • Operational restrictions on testing or "popping" safety valves, especially in port due to vapors and pollution/fire risk • Difference between a valve that opens directly by tank pressure vs one that can be pilot-operated

💭 Think About

• Think about how a typical spring-loaded safety/relief valve stays closed under normal conditions. What keeps it shut until the set pressure is reached? • Consider why ports and terminals might have strict rules about intentionally lifting or "popping" cargo tank relief valves. • Ask yourself whether cargo tank safety valves on modern tankers can be designed to use pilot valves, and how that affects whether they can be opened.

✅ Before You Answer

• Check whether safety valves are normally held closed by tank pressure or by some mechanical means (like a spring). • Consider whether regulations and safe practice allow intentionally lifting/popping cargo tank safety valves in port. • Verify if cargo tank safety valves may be pilot-operated and how that relates to each of the listed statements.

Which of the following applies to cargo tank safety valves?

are not held closed by tank pressure

can be opened by pilot valves

are not to be "popped" in port

all of the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer