What is the length of pipe required to fabricate an 8'' diameter schedule 40 pipe spool with one 90 degree butt weld elbow and one 45 degree butt weld elbow, assuming a 1/8 welder gap?

To determine the correct length of pipe required for the fabrication of an 8-inch diameter schedule 40 pipe spool with both a 90-degree butt weld elbow and a 45-degree butt weld elbow, as well as accounting for a 1/8-inch welder gap, specific calculations must be followed.

The first step is to establish the centerline lengths of the elbows. For an 8-inch diameter schedule 40 pipe, the radius can be found in piping tables. The centerline radius for an 8-inch elbow is typically taken as 8 inches for standard elbows.

1. Calculate the length of the 90-degree elbow: The formula to determine the length of a 90-degree elbow is typically the pipe's diameter multiplied by 1.5 (as a standard). In this case:

   • 1.5 x 8 inches = 12 inches.

2. Calculate the length of the 45-degree elbow: A similar method applies to the 45-degree elbow, for which a standard calculation is to take approximately 1.0 times the pipe diameter:

   • 1.0 x 8 inches = 8 inches.

3. Account for the welder gap: The wel