Style 10 and Style 80 rotary unions or swivel joints may experience washout when high-velocity fluid, sand, cement slurry, or acidizing fluid erodes the sealing area or pressure wall. Once a leakage path forms, erosion accelerates quickly and can penetrate the component.
Common causes include worn seals, incorrect repair kits, damaged ball races, excessive rotation torque, misalignment, pressure pulsation, and using a component beyond its pressure or service rating. Abrasive solids and high flow velocity increase the risk.
Inspection should focus on seal extrusion, groove wear, wall thinning, thread damage, and local corrosion. Any joint showing leakage, abnormal noise, unstable rotation, or visible erosion should be removed from pressure service.
Prevention depends on correct model selection, compatible seals, clean assembly, proper lubrication, controlled operating pressure, and scheduled replacement of wear parts.
