| Source | What you get | Quality | |--------|--------------|---------| | | User-uploaded old edition (1999) | Searchable, missing annexes | | Academia.edu / ResearchGate | Extracts, training slides | High-quality summaries from certified instructors | | Your company’s API portal | Official PDF (most common) | Best – check with your reliability engineer | | Google Scholar | "API 687 rotor repair" → view only snippets | Good for figures and key clauses |

API Recommended Practice 687 () is the industry standard for the inspection and repair of special-purpose rotating equipment, including rotors, bearings, and couplings. The current 2nd Edition (released in 2023) expanded its scope to include stationary components and updated guidance on modern repair technologies and shop selection. Core Content & Phases of API 687

Then filter by (gets newer drafts or training copies).

: This is the most current version, expanding guidance on repair challenges ranging from performance inefficiencies to reliability concerns.