How many total specimens must be tested when a welding procedure is performed on 8" x 0.500" wall?

In the context of API 1104, the number of total specimens required for testing a welding procedure is based on specific criteria outlined in the standard. For a pipe of 8" in diameter and 0.500" wall thickness, the standard typically dictates that for the qualification of a welding procedure, a minimum of eight specimens must be tested.

This requirement ensures that the welding procedure has been sufficiently evaluated across a range of conditions and potential defects. Testing multiple specimens helps to guarantee the structural integrity and performance of the welds under the specified conditions. Each specimen contributes to a comprehensive assessment of the welding technique, material compatibility, and the overall reliability of the weld.

The choice of eight specimens aligns with the goals of achieving statistical significance in the results, allowing for a more robust understanding of the welding procedure's effectiveness.