What is the diameter of a flash leg?

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Multiple Choice

What is the diameter of a flash leg?

Explanation:
When a condensate line flashes to steam, the goal is to move that high-velocity flow quickly and safely away from the trap area. Keeping the flash leg’s diameter small—six inches or less—helps maintain a high flow velocity, reduces heat loss, and keeps the piping compact and easier to manage. A smaller diameter also minimizes the chance of condensate pooling and makes venting and drainage simpler. Larger diameters would slow the flow and create more space for condensate to backlog, which isn’t desirable in this setup, so six inches or less is the standard.

When a condensate line flashes to steam, the goal is to move that high-velocity flow quickly and safely away from the trap area. Keeping the flash leg’s diameter small—six inches or less—helps maintain a high flow velocity, reduces heat loss, and keeps the piping compact and easier to manage. A smaller diameter also minimizes the chance of condensate pooling and makes venting and drainage simpler. Larger diameters would slow the flow and create more space for condensate to backlog, which isn’t desirable in this setup, so six inches or less is the standard.

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