New York Low Pressure Boiler COF Practice

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

1. 1/2 inch

2. 3/4 inch

3. 1 inch

4. 2 inches

The correct answer is: 3/4 inch

The minimum feed water piping connection size required for a boiler with more than 100 square feet of heating surface is established to ensure adequate water supply to the boiler. A size of 3/4 inch is considered appropriate for this capacity because it strikes a balance between allowing sufficient water flow into the boiler while preventing issues related to pressure drop or flow restriction, which could compromise the efficiency and safety of the boiler operation. In larger boilers, the demand for water can be significant due to the rate at which steam is produced, and the 3/4 inch connection size is specifically designed to meet those demands effectively. It is important to ensure that the piping is capable of handling the anticipated flow rate without causing excessive back pressure or turbulence that could hinder the proper function of the boiler. The other sizes listed would not provide the right balance of flow characteristics needed for optimum boiler performance in this case, which is why they are not considered the minimum requirement for a boiler of this size.