ASME Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The minimum size of pipe allowed for a feed connection for boilers with a heating surface of 100 ft² or more is established to ensure adequate water flow and pressure for efficient boiler operation. In the context of boilers, proper feedwater supply is critical for maintaining water levels, facilitating heat transfer, and preventing overheating or operational failure.

A 3/4 inch pipe size is deemed appropriate for boilers with a significant heating surface area to allow sufficient water flow while minimizing pressure drops that could occur with smaller pipe sizes. This ensures that the boiler receives an adequate supply of water to maintain safe and efficient operation.

While smaller pipe sizes, such as 1/2 inch or 1/4 inch, may be feasible for smaller systems or applications that require lower flow rates, they do not provide the capacity needed for larger boilers. A 1-inch pipe size would typically be larger than necessary for this specific application, potentially leading to increased costs and installation complexity without providing significant benefits.