What is the minimum pipe size for feed connections on high-pressure boilers with more than 100 ft.² of heating surface?

The minimum pipe size for feed connections on high-pressure boilers with more than 100 square feet of heating surface is 3/4 inch. This requirement is based on ensuring adequate flow and pressure to support the operational needs of the boiler. A larger pipe diameter allows for a sufficient volume of water to be delivered quickly to the boiler, which is crucial for maintaining safe and efficient operation, especially in high-pressure contexts.

Using a pipe size smaller than 3/4 inch might lead to restrictions that could result in inadequate feedwater supply. This can cause issues such as overheating and potential boiler failure. Regulations and standards in the plumbing and steam boiler industry specify this size to mitigate such risks and ensure reliable performance.