What information is needed when using a miter list for an elbow?

When using a miter list for an elbow, the specific information required includes the radius type (long or short), thickness of insulation, and the pipe size. This is essential because each of these factors determines how the elbow will be cut and assembled, ensuring proper fit and alignment within the piping system.

The long or short radius indicates the curvature of the elbow, which affects how the pipe will change direction and influences flow characteristics. The thickness of insulation is necessary for calculating overall dimensions to maintain thermal efficiency and desired performance. Finally, the pipe size is critical, as it relates to the diameter and can affect both flow rates and pressure within the system.

Having only the length of the pipe or just the type of insulation would not provide enough detail to accurately install or fabricate the elbow, and knowing the diameter of the fittings alone is insufficient without the corresponding information about radius and insulation. Hence, the comprehensive details provided in the selected answer ensure that the elbow is correctly specified for its intended application.