: The standard provides quantitative criteria to eliminate subjective assessments that could lead to failure.

API 687, officially titled "Rotor Repair," is a recommended practice published by the American Petroleum Institute (API). First released in 2001 with a major revision in 2015, this standard sets the benchmark for the repair, rebuilding, and refurbishment of rotors used in turbomachinery.

The API 687 standard provides guidelines for the repair and reconditioning of rotors used in API 6A and 6D valves. By following the API 687 rotor repair process and downloading a PDF version of the standard, valve owners and repair shops can ensure that rotors are repaired to meet the required performance and safety standards.