Journeyman Pipefitter Practice Test

The minimum bottom drain connection size for a high temperature water boiler is typically 2 inches. This size is necessary to ensure adequate flow and drainage of water, especially in the case of maintenance and cleaning. A smaller size, such as 1 inch, would not provide sufficient capacity for draining the high-temperature water, which could lead to longer drainage times and potential overheating issues if the water cannot be expelled quickly enough. Therefore, opting for a 2-inch connection helps maintain efficient operation and safety standards in high-temperature applications.