Open ullage holes in tanks which are not...

Question 1 / 205eccef9cbacbc34ba4d45c04

Question 1 of 205eccef9cbacbc34ba4d45c04

Open ullage holes in tanks which are not gas-free must be protected by __________.

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Question 1 of 20

5eccef9cbacbc34ba4d45c04

Open ullage holes in tanks which are not gas-free must be protected by __________.

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🔍 Key Concepts

• Tank ullage holes purpose and what can escape from them when a tank is not gas-free • How ignition sources outside a tank can be prevented from igniting vapors inside the tank • Difference between pressure/vacuum protection and flame arresting devices

💭 Think About

• Ask yourself: What is the main safety hazard at an open ullage hole on a tank that still contains flammable vapors? Is it overpressure, backflow, or flame propagation? • Which of the listed devices is specifically designed to stop a flame front from traveling through an opening, while still allowing gas to pass? • Think about where you have seen each option used: Which ones are usually on vent lines, which are on cargo systems, and which are purely informational?

✅ Before You Answer

• Verify which device is specifically intended to prevent flames from passing into or out of a tank opening while allowing gas/vapor flow. • Confirm that PV (pressure/vacuum) valves and stop-check valves are mainly for pressure or flow control, not for stopping flame fronts. • Remember that warning signs do not provide physical protection against ignition or flame travel—only information.

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Question 1 of 20

Open ullage holes in tanks which are not gas-free must be protected by __________.

warning signs

flame screens

PV valves

stop-check valves

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Question 1 / 205eccef9cbacbc34ba4d45c04

Question 1 of 205eccef9cbacbc34ba4d45c04

Open ullage holes in tanks which are not gas-free must be protected by __________.

Back

Question 1 of 20

5eccef9cbacbc34ba4d45c04

Open ullage holes in tanks which are not gas-free must be protected by __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed