Focuses on initial cleaning, visual assessment, and measuring runouts. It is critical for documenting "as-received" conditions before any disassembly occurs.
But the most reliable high-quality free copy is often found in or Texas A&M’s Turbomachinery Laboratory publications – search their sites for "API 687 summary". api+687+rotor+repair+pdf+download+better
API Publishes First-Edition Standard For Pump Repair and Inspection Focuses on initial cleaning
: The standard specifies strict Non-Destructive Examination (NDE) criteria. For example, wet magnetic particle inspection is preferred over dry methods to avoid arcing on finished surfaces, and residual magnetism must be below 2.0 gauss . api+687+rotor+repair+pdf+download+better