What is the required minimum size of feed water piping for boilers with more than 100 sq ft of heating surface?

The required minimum size of feed water piping for boilers with more than 100 square feet of heating surface is 3/4 inch. This size is specified to ensure adequate flow to the boiler, which is crucial for maintaining proper operation and efficiency. In boilers with larger heating surfaces, the demand for feed water increases significantly, necessitating a larger diameter pipe to handle the volume of water needed without causing restrictive flow.

Using piping that is too small can lead to reduced water flow, which can affect the boiler's performance and safety. It may contribute to issues such as insufficient heat transfer, increased pressure fluctuations, and even potential overheating if the water isn’t supplied at the necessary rate. Therefore, a 3/4 inch feed water pipe is established as a standard to support larger boilers adequately, ensuring they operate efficiently and safely under higher load conditions.