New York Low Pressure Boiler COF Test 2025 – 400 Free Practice Questions to Pass the Exam

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What is the minimum size of a bottom blow off valve?

1/2"

3/4"

The minimum size of a bottom blow off valve is set at 3/4". This standard is primarily based on ensuring sufficient discharge capacity to effectively remove sediment and sludge that may accumulate at the bottom of a boiler. By specifying a minimum size, it guarantees that the blow off valve can efficiently manage the water and any impurities, thereby maintaining the operational efficiency and safety of the boiler system.

Choosing a size smaller than this could lead to inadequate removal of sediment, which can cause various issues, such as reduced heat transfer, overheating, and even boiler failure. The 3/4" dimension strikes a balance between effective operation and managing the flow rate adequately during blow off procedures.

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