New York Low Pressure Boiler COF Practice

What is the minimum size of blow-off piping according to standard regulations?

1. 1 inch

2. 1/2 inch

3. 3/4 inch

4. 2 inches

The correct answer is: 3/4 inch

The minimum size of blow-off piping is established to ensure proper drainage and to accommodate the flow of water when the boiler is being blown down. This is crucial for maintaining system efficiency and safety, as blow-off procedures are essential for removing sediment and impurities that can accumulate in the boiler. A size of 3/4 inch for blow-off piping is generally recognized in standard regulations because it strikes a balance between ensuring sufficient flow to prevent blockage and being large enough to handle the volumes of water expelled during blow-off operations without undue pressure drop or risk of damage due to insufficient drainage capacity. Smaller sizes might not provide adequate drainage and could lead to operational issues, while larger sizes would be unnecessary and may also require more extensive piping systems, increasing installation and maintenance costs. Thus, the designation of 3/4 inch as the minimum size for blow-off piping aligns with the operational requirements and safety standards outlined for boiler systems.