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What is the maximum size of a blow down valve?

  1. 1 inch

  2. 2 inches

  3. 2-1/2 inches

  4. 3 inches

The correct answer is: 2-1/2 inches

The maximum size of a blow down valve is 2-1/2 inches. This size is specified in the New York City codes to ensure effective operation and maintenance of low-pressure boilers. A blow down valve is essential for removing sediment and impurities from the boiler, enhancing efficiency and safety. The specification of 2-1/2 inches as the maximum size allows sufficient flow to effectively manage the blow down process while ensuring that the valve can be installed within the constraints of typical boiler layouts. Larger valves could lead to excessive blow down rates, which may cause issues with water levels and potentially damage the boiler system. Therefore, adhering to this maximum size is important for optimal functioning and safety in boiler operations.