Flame screens used on ullage openings...

Question 1 / 270705eccef9cbacbc34ba4d45c05

Question 1 of 270705eccef9cbacbc34ba4d45c05

Flame screens used on ullage openings prevent flames from entering a tank by __________.

Question 1 of 27070

Flame screens used on ullage openings prevent flames from entering a tank by __________.

🔍 Key Concepts

• Flame screens (flame arresters) on ullage openings and their purpose on tank vessels • How a metal mesh or gauze affects heat transfer from a flame front • The relationship between gas temperature, ignition, and metal surfaces

💭 Think About

• Think about what actually stops a flame from propagating through a small metal mesh when the vapor on the other side is still flammable. • Ask yourself: does the main protective effect come from blocking gas flow, changing its direction, or changing the flame’s temperature? • Consider how the metal elements of the screen interact with the hot gases of the flame as they pass through.

✅ Before You Answer

• Identify how a flame arrester or flame screen is described in tank vessel safety material (what physical principle it uses). • Check which option mentions heat removal from the flame rather than just blocking or slowing gases. • Verify which choice explains why the flame cannot ignite vapors inside even though vapors can still move through the opening.

Question 1 of 27070

Flame screens used on ullage openings prevent flames from entering a tank by __________.

reducing the cross-sectional area of the opening

restricting the flow of gases through the opening

creating turbulence in the exiting gas stream

dissipating heat from the flame into the surrounding metal

Question 1 / 270705eccef9cbacbc34ba4d45c05

Question 1 of 270705eccef9cbacbc34ba4d45c05

Flame screens used on ullage openings prevent flames from entering a tank by __________.

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Question 1 of 27070

Flame screens used on ullage openings prevent flames from entering a tank by __________.