What is the minimum size of a blow off line from a boiler over 100 ft.²?

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Multiple Choice

What is the minimum size of a blow off line from a boiler over 100 ft.²?

Explanation:
Blow-off lines are sized to safely carry away the hot water that’s expelled from a boiler during blowdown. As the boiler’s heating surface increases, more discharge can occur, so the line must be large enough to handle that flow without creating excessive velocity or backpressure. For boilers with heating surface over 100 square feet, the minimum blow-off line diameter is 1 inch. That’s why the 1-inch size is the correct choice here. Smaller diameters would restrict flow and could be unsafe, while a 2-inch line isn’t required by this minimum standard.

Blow-off lines are sized to safely carry away the hot water that’s expelled from a boiler during blowdown. As the boiler’s heating surface increases, more discharge can occur, so the line must be large enough to handle that flow without creating excessive velocity or backpressure. For boilers with heating surface over 100 square feet, the minimum blow-off line diameter is 1 inch. That’s why the 1-inch size is the correct choice here. Smaller diameters would restrict flow and could be unsafe, while a 2-inch line isn’t required by this minimum standard.

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