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The standard has evolved to address modern reliability and safety challenges. api+687+rotor+repair+pdf+download+better

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API 687 explicitly prohibits certain repairs—like metalizing or plasma spraying—for critical seal areas. Knowing this, the team used the Submerged Arc Welding (SAW) technique and precision machining instead. api+687+rotor+repair+pdf+download+better

After completing the repair:

For instance, while major erosion or corrosion can often be repaired by welding, rub damage must be carefully assessed for surface cracks and heat-affected zones before deciding on a repair method.